EIP 7702, EIP-7691, and x402: How Pectra and Beyond Shape Rollup Design

Ethereum's Pectra upgrade on May 7, 2025, really changed the game for rollups and wallets in some exciting ways! With EIP‑7691, we saw the target blob throughput double, and there were some nice tweaks to the blob fee dynamics. Plus, EIP‑7702 finally made “smart EOAs” a reality. And we can’t overlook the new x402 “HTTP 402 payments” standard. When you put all of this together, it creates a fantastic foundation for cheaper Layer 2 data availability, programmable wallets, and even machine-to-machine monetization. If you want to dive deeper into the upgrade, check out the details here!

---

Who this is for

Decision-makers at startups and larger companies are exploring their choices around building on Ethereum L2s or even creating their own rollups. On top of that, they're considering how to get their wallets, billing systems, and data-publishing pipelines sorted out after integrating with Pectra.

---

What actually shipped in Pectra (and why it matters to rollups)

• EIP‑7691 has doubled the blob target from 3 to 6 for each block and pushed the max limit from 6 to 9. It also adjusted the blob base-fee sensitivity with a fresh update fraction. What does all this mean for you? Well, you'll get more blobspace, faster price drops when demand eases up, and a more seamless experience during those wild demand surges. Want to dive deeper? Check it out here: (eips.ethereum.org).
• EIP‑7702 introduced an exciting new type‑4 transaction that lets EOAs assign contract code using signed authorizations. In simpler terms, you can delegate tasks to some trusted wallet logic that you know is legit. This opens the door to some neat features such as batching, sponsored gas, and customized permissions--all while keeping your original address intact. Check out all the details here: (eips.ethereum.org).
• EIP‑7623 has raised the calldata floor pricing for those transactions that pack a lot of data. The goal here is to reduce the chances of hitting those maximum block sizes and gently encourage data access to blobs, which should help keep network bandwidth steady as blobs continue to expand. If you’re curious and want to dive deeper, you can find more details here: (eips.ethereum.org).
• EIP‑7840 rolled out a standardized "blobSchedule" for client configurations. This change really streamlines the way software tracks blob parameters for different forks (think Cancun vs. Prague) without the hassle of dealing with delicate Engine API handshakes. It's super useful for fee estimation and simulations. Check out the details here: (eip.info).

Ethereum launched Pectra on the mainnet at epoch 364032 on May 7, 2025. So, if you're looking to make any comparisons before or after, that date is key! Check it out here: (blog.ethereum.org)

---

Quantifying your new DA budget after EIP‑7691

Blobs are made up of 4096 field elements, and since each element is 32 bytes, that adds up to a grand total of 131,072 bytes--or 128 KiB for those keeping track. Now, when we talk about Pectra's fresh target and max configuration (6/9 blobs), here's how it all breaks down:

• Target capacity: roughly 6 blobs × 128 KiB × around 7,200 blocks/day, which adds up to about 5.27 GiB/day.
• Max capacity: close to 9 blobs × 128 KiB × roughly 7,200 blocks/day, bringing the total to about 7.91 GiB/day.

We're jumping straight into the nitty-gritty, pulling from the details laid out in EIP‑4844 and EIP‑7691. These serve as the backbone for strategizing rollup data availability (DA). If you want to explore more, take a look here: (eips.ethereum.org).

Two Knock-On Effects You Should Model:

1. Impact on Supply Chain
   Whenever you’re planning to make changes, keep in mind how they might affect your supply chain. Tweaks in one spot can impact everything else, from production speeds to delivery schedules. It’s a good idea to chart out these possible shifts so you can stay ahead of any bumps in the road.
2. Customer Behavior Changes
   The changes you make might spark some shifts in how your customers behave. You might notice different buying patterns or even a rise in feedback. These shifts can really impact your sales and marketing moves. So, it’s super important to stay tuned into what your customers are saying and doing, so you can adjust on the fly.

• Asymmetric fee dynamics: If you're working with a 6-blob target, you'll see that the blob base-fee tends to dip faster than it rises when it's above that target--about -14.5% per block compared to +8.2% in the usual setup. This approach helps keep average costs lower and helps smooth out those sudden price jumps. So, as you tweak your max_fee_per_blob_gas, why not think about easing those limits upward a bit, but not as aggressively as you did before Pectra? At the same time, it might be a good idea to lower those tripwires to grab opportunities when things are a bit quieter. (eips.ethereum.org)
• Calldata is a less reliable fallback: With EIP-7623 raising the bar for data-heavy transactions, it's getting tougher for calldata to stack up against blobs in terms of cost per byte--unless we hit one of those wild blob surges. So, when you’re laying out your strategy, it’s best to keep the “fall back to calldata” option for those occasional spikes. (eips.ethereum.org)

Implementation Detail

To stay ahead of the game, make sure to expose Pectra’s blob parameters in your fee estimator and simulations. Instead of hardcoding those values, pull the per-fork blobSchedule for things like target, max, and update fraction. This approach helps you adapt to changes seamlessly and keeps you future-proof. For more details, take a look at this link: (eip.info).

---

EIP‑7702 in practice: from EOAs to programmable wallets (without new addresses)

EIP‑7702 lets Externally Owned Accounts (EOAs) get in on the action by giving them the power to "set code" using an authorization list that includes tuples like [chain_id, address, nonce, y_parity, r, s]. Here’s how it works: clients simply need to write a delegation indicator (0xef0100 || address) into the account’s code. This indicates that execution will direct to that contract until it's updated again. The best part? It smoothly integrates with ERC‑4337 flows and plays nice with bundlers and paymasters. If you want to dive deeper into the details, check it out here.

Security Gotchas You Need to Handle (All Mentioned in the Spec):

1. Input Validation
   Always double-check user input. Seriously, don’t trust anything right off the bat. It's super important to verify things like type, length, format, and range to keep everything secure.
2. Authentication Flaws
   Keep an eye out for those weak passwords and any session management hiccups. It's crucial to set up strong password policies and ensure that session tokens are managed securely.
3. Authorization Issues
   Just because someone’s logged in doesn’t mean they should have the keys to the kingdom. Make sure permissions are on point--don’t let users stumble upon things they shouldn’t see or mess with.
4. Data Exposure
   It's super important to protect sensitive info--think passwords, credit card numbers, and personal details. Make sure to encrypt this data, whether it's being sent over the internet or stored away. Keep your data safe and secure!
5. Error Handling
   Watch out for your error messages! You want to make sure they don’t spill too much information that could be useful to an attacker. Keeping your responses generic is a smart move; it helps you avoid revealing any hints about how your system is set up.
6. Dependency Vulnerabilities
   Stay vigilant with the libraries and packages in your project. Old dependencies can really open the door for attackers. Make it a habit to routinely check for updates and look out for any vulnerabilities.
7. Cross-Site Scripting (XSS)
   Don’t forget to sanitize and escape those user inputs! Trust me, this is a crucial step to keep attackers at bay. It helps stop them from sneaking in scripts that could steal your info or mess with your sessions.
8. Cross-Site Request Forgery (CSRF)
   To guard against unauthorized actions that could be taken on behalf of users without their consent, make sure to implement anti-CSRF tokens. This simple move can really go a long way!
9. Security Misconfiguration
   It's super easy to miss a few system settings here and there. Make sure to take a moment to review your configuration so that nothing is left wide open by accident.
10. Logging and Monitoring
    Make sure you’ve got solid logging and monitoring in place to catch any weird activity before it spirals out of control. Trust me, it’s way better to be safe than sorry!

Every single one of these points is super important for keeping your application safe and sound. So, don’t forget to weave them into your development process!

• Initialization front‑running: Don’t fall into the trap of initcode execution when you’re delegating. Always ensure that the first-time setup calldata is signed by the EOA (using ecrecover) to protect your storage from any unpleasant surprises. For more details, take a look here.
• Storage migrations: When you’re swapping out delegates, it’s really crucial to steer clear of any storage collisions between your old and new implementations. One way to do this is by using namespaced storage, similar to what’s shown in the ERC‑7201 patterns, in your delegate contracts. For more info, check it out here.
• Sponsored relays: Just a heads up, even if you prepay, a user can still choose to invalidate or drain assets. So, it's something to keep in mind. If you’re managing a relayer, consider asking for bonds or working on building a solid reputation to protect your operations. You can find more details here.

Developer-level integration just got a whole lot simpler! MetaMask’s Smart Accounts Kit now has these handy quickstart guides that walk you through setting up 7702 delegation and snagging those awesome advanced ERC-7715 permissions. For instance, you can easily authorize transactions like “10 USDC/day for 30 days” using the built-in session accounts. This feature is super handy for keeping tabs on subscriptions and managing agent workflows. Dive into it here: (docs.metamask.io)

Why This Matters for a Rollup

Standardizing the user experience with a single canonical address is a major plus for rollups. This approach unlocks the potential for sponsored or gasless transactions on Layer 2, while still letting you take advantage of ERC‑4337 for bundling and routing when it makes the most sense.

This method really helps reduce address churn, makes KYC and CRM mapping simpler, and sets the stage for AI or agent-driven commerce--all without having to whip up custom wallet forks. If you want more details, take a look at ethereum.org.

---

x402, not “EIP‑402”: the HTTP 402 payments layer for agents and APIs

Actually, there isn't an Ethereum "EIP-402." What you really want to keep an eye on is the x402 standard. It turns the classic HTTP 402 Payment Required status into an on-chain payment handshake. Here's the gist of how it operates: clients kick things off by requesting a resource, servers reply with a 402 status along with the payment details, and then clients make the payment and give it another shot, this time including proof of payment in the headers. The servers check the payment either locally or through a facilitator, and once everything checks out, they send back a 200 status.

Now, the x402 V2 is really upping the game with wallet-based identities, multi-chain CAIP identifiers, and some standardized headers. Want to get into the nitty-gritty? Check it out here.

Key Pieces You Can Start Using Right Away:

Here are some key components you can start using right away:

• Headers and flow: So, when a server hits you with a 402 status, it’s basically saying “PAYMENT REQUIRED.” The client responds by sending a PAYMENT SIGNATURE back its way. If all the details match up, the server will come back with a 200 status and a PAYMENT RESPONSE. This usually happens after they’ve done some verification or settlement magic through a facilitator’s /verify or /settle endpoints. Want the nitty-gritty? You can check it out here.
• Chain-agnostic design: With CAIP-2 network IDs (like eip155:8453 for Base) included in the payment payloads, you can effortlessly accept USDC on L2s that your users already know and love. For more info, take a look here.
• V2 improvements: Thanks to reusable sessions, dynamic recipients, and extensible schemes, AI agents can now connect with high-QPS endpoints without worrying about those pesky “pay per call” issues. Check out all the details on these updates here.

x402 integrates smoothly with EIP‑7702, letting you grant session permissions (ERC‑7715) right on a user’s EOA-addressed account. You can even cover gas fees whenever needed and let agents handle payments for each request through HTTP. Plus, there's no need to stress about finances--everything gets settled on-chain, which means your finance team can easily keep tabs on everything. For more info, check it out here: (docs.metamask.io)

---

A practical L2 architecture after Pectra

Take a look at this design that we've discovered works wonders for post-Pectra situations.

Blob-First DA Pipeline with Adaptive Batching

When it comes to handling data, especially in machine learning and big data scenarios, the way we manage our data pipelines can make a huge difference. Let’s dive into the blob-first approach with adaptive batching to see how it can streamline your data processing.

What is a Blob-First DA Pipeline?

A blob-first data analytics (DA) pipeline focuses on processing data in larger chunks (or blobs) rather than dealing with it piece by piece. This method can help improve efficiency when you're working with massive datasets by minimizing the overhead associated with processing smaller units of data.

The Beauty of Adaptive Batching

Now, here’s where adaptive batching comes into play. Instead of sticking to a fixed batch size, adaptive batching adjusts based on the data load and system performance. This dynamic approach allows you to handle varying workloads smoothly and efficiently.

Key Benefits of Adaptive Batching:

• Improved Resource Utilization: You make the most of your resources by automatically adjusting the batch size to match the workload.
• Reduced Latency: By processing data in optimal-sized batches, you can minimize delays that come with fixed batch sizes.
• Scalability: It easily scales with your data needs, whether you're ramping up or winding down operations.

How to Implement a Blob-First DA Pipeline with Adaptive Batching

Here’s a simple breakdown of the steps to set up your pipeline:

1. Identify Your Data Sources: Determine where your data is coming from (databases, APIs, etc.) and how you’ll store it in blobs.
2. Set Up Your Blob Storage: Use cloud storage solutions like Azure Blob Storage or Amazon S3 to store your data blobs.
3. Create Data Processing Logic: Develop the necessary logic to handle blob retrieval and processing. This is where you implement your adaptive batching strategy.
4. Monitor and Adjust: Keep an eye on your system's performance and adapt your batch sizes based on the current load and latency metrics.

Conclusion

Embracing a blob-first DA pipeline with adaptive batching can be a game-changer for your data processing tasks. Not only does it boost efficiency, but it also ensures your system is flexible enough to handle whatever workload comes its way. If you’re looking to refine your data practices, this approach is definitely worth considering!

• Try to keep your blob "fill" around 70-90%. This strikes a good balance between the overhead of each blob and avoids fragmentation. Let's break it down into two lanes:
  • Fast lane (latency-sensitive): Post updates every N seconds or as soon as your buffer hits 0.7 blob. This lane is all about enhancing the user experience, so you might spend a bit more for that smoother performance.
  • Bulk lane (throughput-optimized): In this lane, you'll post once you hit 0.9-1.0 blob or when the time limit is up.
• It’s time to tweak those guardrails a bit! Consider allowing for a gradual increase in your acceptable blob base-fee band. We’re noticing spikes climbing roughly 8.2% per block when everything's working at full throttle. On the flip side, think about lowering your “post aggressively” thresholds during the quieter periods since prices tend to drop around 14.5% per block when they fall below the target. It might also be a good idea to automate those bids based on what’s happened in the past. For more info, check this out: (eips.ethereum.org)
• Take advantage of the EIP‑7840 blobSchedule to handle your sim/ops configurations. This way, you won't need to hard-code different setups like 3/6 or 6/9. If you want to dive deeper, check it out here: (eip.info)

2) Fallback Logic Without Surprises

When you’re working on a project, having a solid fallback plan is key. This way, if things don’t go according to plan, you won’t be caught off guard. Here are some tips to keep your fallback logic clear and straightforward:

Define Your Primary Path

Before you set your fallback logic, make sure your primary path is well defined. Know exactly what the ideal outcome is so that when things go sideways, you can easily pivot to your backup options without any confusion.

Clear Alternatives

Always have clear alternatives lined up. This means knowing which choices you can make if the primary option fails. Whether it’s a different route in your code or a backup supplier, it’s essential to have these alternatives documented:

• Option A: Description of the alternative
• Option B: Another choice with details
• Option C: Final backup plan

Simple Triggers

Make it easy to switch gears. Your triggers for the fallback logic should be straightforward. Instead of complicated conditions, think about what signs will indicate that it’s time to activate your backup plan.

if situation == 'failed':
    execute_fallback()

Testing Is Key

Don’t forget to test your fallback logic! Regularly check that everything works smoothly and that your alternatives are up to date. It’s a good idea to run through scenarios where the primary path might fail to see how your fallback kicks in.

Communication is Crucial

Finally, communicate your fallback plans with your team. Everyone should be on the same page about what to do when things don’t go as planned. This way, you’ll minimize surprises and ensure a smoother transition when it’s time to switch gears.

By keeping your fallback logic simple and clear, you set yourself up for success, no matter what challenges come your way!

• Using the calldata fallback should be reserved for those occasional spike windows. It's smart to figure out your break-even curves ahead of time, considering your compression ratio, and don't forget to include the EIP-7623 floor when you're crunching the gas estimates. Also, consider multi-DA options (like Celestia, EigenDA, or DAC) only if your threat model is up for it. (eips.ethereum.org)

3) Sequencer/Batcher Settings (Nitro-Style Example)

When you're getting into sequencer and batcher settings, especially with a Nitro-style setup, there are a few important points to remember. Let’s dive in!

• Sequencer Basics: The sequencer is basically your best friend for keeping track of the order and timing of your operations. Picture it as a conductor directing an orchestra, making sure everything comes together smoothly.
• Batcher Functionality: The batcher is all about grouping tasks to boost efficiency. Think of it like cooking a meal--while you're chopping veggies, boiling pasta, and sautéing meat, everything comes together to get dinner on the table sooner!
• Key Settings to Tweak:
  • Timing: Play around with how long each operation runs. Even a small tweak can really boost performance!
  • Order of Operations: This is super important! Ensure your tasks are arranged in the best order for maximum efficiency.
  • Error Handling: Establish some protocols for tackling any bumps in the road. It’s always better to be prepared!
• Example Configuration: Check out this simple setup to give you an idea of how to get started:

  {
    "sequencer": {
      "operationOrder": ["task1", "task2", "task3"],
      "timing": {
        "task1": 5,
        "task2": 10,
        "task3": 15
      }
    },
    "batcher": {
      "batchingEnabled": true,
      "maxBatchSize": 100
    }
  }

Just a heads up, every setup can vary a bit depending on the details of your project, so don’t hesitate to tweak things to fit your needs! Keep these tips handy, and you’ll be cruising through your setup in no time.

• For the “fast lane,” we’re thinking of reducing the maximum posting delay to just 5-15 minutes. On the other hand, we’ll keep a larger cap of 30-60 minutes for the bulk lane to really boost compression. This way, we can minimize reorder risks and reorganizing exposure without overwhelming the system with a ton of tiny batches. You can check out all the details here.
• Let's go ahead and enable EIP‑4844 blob posting (just make sure you’ve got ArbOS version 20 or higher; also double-check that ExcessBlobGas and BlobGasUsed are included in the parent headers). You can find more info here.

4) Wallet and Payments

When you’re diving into the world of managing your money, having a trustworthy wallet and payment system is super important. Here are a few key points to keep in mind:

Wallet Options

• Digital Wallets: These are really handy for buying stuff online and when you're out shopping. You might want to try options like PayPal, Apple Pay, or Google Pay. They make it so much easier than dealing with cash or cards.
• Cryptocurrency Wallets: If you're diving into the world of crypto, having a wallet is a must to keep your digital coins safe. There are hot wallets that let you access your coins quickly and cold wallets that provide that extra security layer.

Payment Methods

When it comes to making payments, you've got a handful of options:

• Credit/Debit Cards: The old reliable! You can use them almost anywhere, and they often come with sweet perks like rewards points.
• Bank Transfers: Great for when you need to move bigger sums. They might take a little longer, but you can trust they’re pretty secure.
• Mobile Payments: Just a quick tap on your phone and you’re done! This method is getting more and more popular, especially since it’s usually tied to your digital wallet.

Security Tips

• Two-Factor Authentication (2FA): Make sure you turn on 2FA for your wallet accounts. Sure, it adds an extra step, but the extra security is totally worth it.
• Keep Software Updated: Whether it's your wallet app or your smartphone, keeping everything up to date is key to guarding against security flaws.

Conclusion

Being savvy with your wallet and payment options can really help you save time, reduce stress, and maybe even keep a little extra cash in your pocket. Check out the different choices available and see what fits your needs the best!

• Embrace EIP‑7702 delegates that use namespaced storage to make upgrades a breeze (just like the ERC‑7201 layout). For ongoing costs, stick with ERC‑7715 permissions and set up a paymaster to handle those sponsored gas fees when needed. Make sure to connect x402 to your API gateway, so agents and users can easily pay for each HTTP call. (eips.ethereum.org)

5) Metrics You Should Keep an Eye on Weekly

When you're running a business, keeping an eye on the right metrics can really boost your success. Here are some important metrics you definitely want to check in on each week:

1. Website Traffic

Make sure you keep an eye on how many visitors are checking out your website. It's a good idea to look for trends in your daily traffic and see which pages are getting the most attention. Tools like Google Analytics are super handy for diving into your data and uncovering insights.

2. Conversion Rates

Seeing traffic is awesome, but the real goal is turning those visitors into customers, right? Keep an eye on your conversion rates for different calls to action--things like newsletter sign-ups and product purchases. This way, you can figure out how well you're guiding folks down the path to action.

3. Customer Acquisition Cost (CAC)

How much are you shelling out to attract new customers? By dividing your marketing expenses by the number of customers you bring in, you can get a clear picture of your Customer Acquisition Cost (CAC). Keep this number on the lower side to let those profits really glow!

4. Social Media Engagement

Take a moment to see how your posts are doing on your social media. Are folks liking, sharing, or chiming in with comments? Keeping an eye on those engagement metrics is super helpful for figuring out what’s really connecting with your audience.

5. Customer Retention Rate

Finally, let’s not overlook your current customers! Keeping track of how many choose to stick around can really shed some light on their satisfaction and loyalty. A high retention rate usually means you’re on the right track!

By checking in on these metrics every week, you’re putting yourself in a great position for success and making smart, data-driven choices. Happy tracking!

• The distribution of Blob "fill", the time it takes for base fees to double or halve, and the average MiB per transaction batch compared to the compression ratio. We’ll also look at the calldata fallback count and the associated cost changes, settlement delays, reorganization windows, and the success rates from x402 authorization to verification.

---

Worked example: designing a blob budget and fallback

Assume the Following:

1. The Sky is Blue: Ever noticed how the sky usually looks blue during the day? That’s because of Rayleigh scattering! The shorter blue wavelengths of sunlight scatter more than other colors.
2. Water Boils at 100°C: At sea level, water boils at 100 degrees Celsius, but this can change depending on altitude. So, if you’re in the mountains, it might boil at a lower temperature.
3. The Earth Revolves Around the Sun: We all learned this in school: the Earth orbits the Sun once a year. But did you know that it also rotates on its axis, which gives us day and night?
4. Human Body is Mostly Water: About 60% of our body is made up of water. That's a lot! Staying hydrated is super important for our health, right?
5. Cats Can’t Taste Sweetness: Unlike us, cats lack the taste receptors to enjoy sweets. So, while they might show interest in your dessert, they really can’t taste it!
6. The Internet is Global: The World Wide Web connects billions of people across the globe. From social media to online shopping, it has changed the way we communicate and live.
7. Electricity Travels at the Speed of Light: When you flick a switch, electricity flows through wires at nearly the speed of light. That’s pretty fast!
8. Honey Never Spoils: Archaeologists have found pots of honey in ancient Egyptian tombs that are over 3,000 years old and still perfectly edible. Talk about a sweet discovery!
9. Sharks are Older than Trees: Sharks have been around for over 400 million years, while trees hit the scene about 350 million years ago. Nature’s been perfecting sharks for a long time!
10. Bananas are Berries: Seriously! Botanically speaking, bananas are classified as berries, while strawberries are not. Nature loves to keep us guessing.

Let me know if you need any more info!

• After compression, we're looking at an average batch of roughly 0.78 blobs, which comes to about 100 KiB when you add up the ops and headers.
• We aim to have the DA wrapped up on L1 in 10 minutes flat or even quicker.
• Currently, the blob base fee stands at B; your max bid is capped at 2.5B, and you're ready to roll if the fee dips to 2.0B or lower.

Policy:

• Fast lane posts: You’ve got 0.7 blobs to work with or 8 minutes--whichever comes first.
• Bulk lane posts: Here, it’s 0.95 blobs or a solid 30 minutes.

What happens during a spike?

When we dive into the 2:3 target:max and take into account the changes from EIP‑7691, here's the scoop: two complete blocks in a row will nudge the blob base-fee up by about 1.082², which comes out to roughly 1.17 times what it was before. The best part? Your 2.0B trigger keeps doing its thing even during a quick spike--so there's no need to stress about any lane thrashing.

If blocks start turning up empty after that initial rush, you’ll see the base fee begin to decrease, dropping at roughly 0.855 per block. In just about 5 to 7 blocks, you'll get back to the baseline, which means you can clear the bulk lane without spending a fortune. For a deeper dive into this, check it out here.

What if blobs surge above your cap?

If you notice that the blobs are creeping up past your limit, here's the deal: you'll want to switch to calldata only when the total cost per MiB--taking the EIP-7623 floor into account--actually drops below your max limit of 2.5 billion. Just a quick heads up, though: this scenario probably won't happen too often. It's a good idea to run some simulations using your actual compression rates and per-byte costs before you flip that automatic fallback switch. You can find more details here.

---

Account abstraction decisions in 2026: “smart EOA,” ERC‑4337, or both?

• “Smart EOA” via 7702: If you're looking to keep your canonical address the same and want a straightforward way to handle permissions or sponsorships, this is a great choice. Just remember to use audited delegate code and keep your upgrades simple. You can find more details here: (eips.ethereum.org).
• ERC‑4337: If you're working on some complex multi-tenant stuff or need to roll out custom validation, this is definitely the route you want to take. It's super handy if you're looking to leverage the existing bundler/paymaster ecosystems. Right now, most providers are on EntryPoint v0.8. For more details, check it out here: (eip.info).
• Hybrid: Using 7702 delegates that link up with ERC‑4337 wallet code lets you share modules and paymasters across both methods. This means smoother migrations and a more consistent experience for users. Want to learn more? Check it out here: (eips.ethereum.org).

Thanks to the new standard for modular smart accounts (ERC‑7579), you can now seamlessly move your modules, such as validators, hooks, and passkeys, across various stacks. It’s definitely wise to choose wallets and delegates that comply with 7579; this helps you sidestep the risk of getting locked into a single ecosystem later on. Want to dive deeper? Take a look here: (eips.ethereum.org).

---

Near‑term roadmap: PeerDAS and “BPO” forks

Pectra isn't the last stop on this journey. With PeerDAS (EIP‑7594), we get this cool data-availability sampling feature, which means not every single node has to download every blob. Plus, there’s the “Fusaka” upgrade from the Ethereum Foundation, set to drop on December 3, 2025. This upgrade will introduce Blob Parameter Only forks--basically, these are just config changes that can safely bump up blob targets once PeerDAS is in play.

Get ready for some blob increases and more stable fees! Don’t forget to set up your estimators and dashboards so they automatically grab those new blobSchedule entries. You can dive into the details here.

---

How x402 changes your go‑to‑market

• Set your API prices in USDC per call on an L2 that your users are already familiar with. You can use PAYMENT-REQUIRED for promotion, verify it through a facilitator, and send back PAYMENT-RESPONSE once everything checks out. This method eliminates the hassle of needing API keys, accounts, and card processors for usage-based endpoints, and it stays nice and compatible with HTTP. Check out the details here: (docs.cdp.coinbase.com)
• Combine this with 7702 + ERC‑7715 to set up those handy “set-and-forget” subscriptions and agent budgets. You can easily put limits in place, like a $10/day cap. And the best part? You can make payments on L2s and settle everything on-chain, all without the hassle of custom relayers. Check it out here: (docs.metamask.io)
• Thanks to the x402 V2’s wallet-based identity and session system, you can forget about having to pay for every single request. This translates to lower latency and costs, which is a total game changer for those high-frequency AI tasks. (x402.org)

---

Implementation checklist (30/60/90 days)

• 30 days
  • Alright, let’s kick things off by enabling blob posting if it isn’t already turned on. We’ll want to make sure that ArbOS and the parent chain are in sync, and then we can set up those dual-lane batcher timers and thresholds. For all the nitty-gritty details, take a look at the docs here.
  • Next up, we should update the estimators and dashboards so they can read blob schedules and keep tabs on those blob base-fee elasticity metrics. For a deeper dive, check out the EIP info here.
• 60 days
  • We've got a busy couple of months ahead! We need to roll out a 7702 delegate that packs in namespaced storage, audits, and, of course, a reliable rollback plan. We'll also be piloting sponsored flows for key journeys like onboarding and swaps. If you want to dive deeper, check out the EIP documentation here.
  • On top of that, we need to set up an x402 pilot endpoint with USDC on Base or your favorite L2. And let’s keep an eye on those verification and settlement latencies. You can catch all the details in the CDP docs here.
• 90 days
  • We’re excited to announce that we’ll be introducing ERC-7715 permissions for subscriptions and agents soon. It’s super important to set some organization-wide limits and put a solid system in place to catch any potential abuse. If you want to dive deeper into this, take a look at the MetaMask docs here.
  • And let’s not forget, we need to simulate those PeerDAS-era capacity and cost envelopes. We should get those thresholds for BPO forks pre-approved so we can jump into action when blob targets start to ramp up. For a deeper understanding, you can check out the EIPs working group info here.

---

The bottom line

• Pectra's EIP‑7691 is all about giving your rollup a little boost when it comes to data availability and making blob fees more user-friendly. Get ready to explore blob-first batching and some clever triggers to really leverage the advantages! Check it out here: (eips.ethereum.org).
• Thanks to EIP‑7702, we’re finally seeing the rise of "smart EOAs"! This opens the door for a gasless user experience, easy subscription setups, and agent-driven transactions, all without needing to create new addresses. It’s like crafting your delegates is a wallet design: think namespaced storage, straightforward initialization, and upgrade playbooks! More info here: (eips.ethereum.org).
• x402 takes HTTP and turns it into your go-to payment rail! When you pair it with 7702/4337, along with stablecoins on L2, monetizing APIs and agent usage becomes a whole lot simpler. Dive deeper: (docs.cdp.coinbase.com).

Aligning your rollup pipeline, wallet stack, and billing with these updates will help you deliver transactions more cost-effectively. Plus, you'll provide a smoother user experience and build a business model that can scale with the upcoming surge of agentic and enterprise-grade use cases.

---

References and specs worth bookmarking

• Exciting news! The Pectra mainnet is just around the corner, and we’ve got some fantastic blob scaling updates and key dates to share. Check it out here: (blog.ethereum.org)
• EIP-7691 has arrived, giving blob throughput a nice little boost while making fees more responsive. Want to know more? Dive in here: (eips.ethereum.org)
• With EIP-7702, we’re seeing a method to define code for EOAs, plus some crucial security points you should definitely consider. Get the details here: (eips.ethereum.org)
• EIP-7623 is taking on calldata floor pricing--this one’s worth your time! More info is available here: (eips.ethereum.org)
• Check out EIP-7840, where it discusses the blobSchedule in client configurations. You can find the details here: (eip.info)
• EIP-4844 focuses on blob size and fee mechanics, which is super important for all you developers out there. Read up on it here: (eips.ethereum.org)
• Get hyped for PeerDAS and the sneak peeks of Fusaka/BPO! More info is waiting for you here: (eips-wg.github.io)
• If Arbitrum is on your radar, you’ll definitely want to check out their docs for batcher/DA and the specific settings they have available. Take a look here: (docs.arbitrum.io)
• MetaMask has launched the Smart Accounts Kit, complete with ERC-7715 permissions! Get all the juicy details here: (docs.metamask.io)
• And last but not least, don’t forget to check out the x402 docs and updates for V2. Here’s where you can find them: (docs.cdp.coinbase.com)

---