API-First Blockchain Design: Why It Matters for Enterprise Rollouts

Short Summary

If you really want to dive into blockchain at an enterprise level, going API-first is definitely the way to go. It helps you steer clear of a lot of potential risks while getting things off the ground. This guide is designed to help decision-makers through the rollout process. We’re going to dive into some reliable interface standards, security practices, observability techniques, and integration patterns that have really proven themselves in the latest industry updates and tokenization experiments.

Who this is for

Hey there! So, if you're a startup founder or a product leader diving into blockchain features and feeling the pressure of those tight go-to-market deadlines, you're definitely in good company! Enterprise architects and VPs of Engineering really prioritize making sure everything runs smoothly, stays compliant, and integrates effortlessly with partners.

The tl;dr on API-first for blockchain in 2025

When we say "API-first," we're talking about kicking things off by designing and rolling out your interfaces, both for the outside world and for internal use. This includes things like REST APIs, event handling, and the related policies. Only after you've got those sorted out do you move on to building the actual services, smart contracts, and wallets that will back them up. This approach really helps turn all the unpredictable things--like mempools, reorgs, fee swings, and those tricky cross-chain interactions--into reliable service-level agreements (SLAs) and contracts. This means your organization can depend on them, and your partners can easily work with them too.

Right now, there are two big changes happening that are really pushing the whole API-first approach to the forefront.

Ethereum's Dencun upgrade, also known as EIP-4844, has really transformed the way data availability is handled for Layer 2 solutions with these cool new blob transactions. Wow, rollup economics and throughput expectations have really changed a ton compared to just a year ago! It's really important for your APIs to keep evolving so that everything runs smoothly for your clients. Hey, why not take a look at the info over on the Ethereum blog? You’ll find some cool updates there!

When it comes to global payments, it looks like the move to ISO 20022 is almost complete. Just a heads-up: the coexistence phase for important MT messages is wrapping up on November 22, 2025. Mark your calendars! So, what this really means is that your blockchain setup will need to work more closely with ISO 20022 flows instead of just running on its own. If you want to dive deeper into this, check out the SWIFT website for more details. It’s got all the info you’ll need!

Here’s a great framework that outlines the interfaces, standards, and proven patterns to ensure blockchain works as smoothly as core enterprise software.

A reference blueprint for API-first blockchain platforms

1) Define public and partner APIs before chain logic

Use OpenAPI 3 to model your REST/HTTP services. 1, which is totally in sync with JSON Schema 2020-12. This really simplifies things like validation, examples, and polymorphism, especially when you're working with various tools. Also, you can easily add notes about rate limits, how to handle errors, and make sure things are idempotent. Take a look at it over on GitHub! You won't want to miss it!

Alright, let’s chat about streaming and events using AsyncAPI 3.

So, first off, what’s AsyncAPI? It’s a super handy tool that helps you document and design your asynchronous APIs, kind of like OpenAPI does for REST APIs. Now, when it comes to streaming and events, AsyncAPI really shines.

Streaming is all about continuously sending data--think of it like a live video feed or a real-time chat app. With AsyncAPI 3, you can define how your messages flow through the system, what channels are used, and how to subscribe to those messages. It helps you get a clear picture of how your data is being pushed in real-time and what your consumers can expect to receive.

Events, on the other hand, are like little notifications or messages that pop up when something happens, such as a user clicking a button or a back-end process completing. AsyncAPI 3 lets you specify the events that can occur within your system, making it easier to understand how everything connects and interacts. You can outline what kind of data is sent with each event, how it's structured, and who is listening for these messages.

In short, whether you’re streaming data live or dealing with event-driven architectures, AsyncAPI 3 gives you all the tools you need to document it clearly and effectively. It’s all about making your async APIs as understandable as possible, so everyone on your team can get on the same page. Cool, right? So, there's this cool upgrade, version 0, that's designed to be backwards-compatible. It works smoothly with Kafka, NATS, and Webhooks, which is pretty awesome! It's really handy for dealing with confirmations, sorting out reorganizations, and spotting any fraud signals. You can check out more details over on GitHub. It’s a great resource if you’re looking for the latest updates!

Go with GraphQL only if you can manage all the users or applications that are going to use it. To keep things running smoothly and avoid hefty query costs, it's a good idea to stick with persisted or whitelisted queries. Doing this helps minimize the chances of any unintentional snooping in your production environment. If you want to dive deeper, check out GraphQL for more details!

Practical Tip: It’s a good idea to maintain one OpenAPI for REST and one AsyncAPI for every domain you have, like "wallet," "tokenization," or "settlement." This way, your documentation stays organized and easy to manage! "Think of them like agreements that help manage how you roll out your deployments."

2) Edge and gateway controls (security and stability)

Idempotency: It's a good idea to ask for an Idempotency-Key on all your POST and PATCH endpoints where you're making changes. This way, you can avoid accidentally creating duplicates or messing things up! Hey, it’s smart to allow retries for like 24 to 48 hours. If you happen to get any conflicting replays, just go ahead and send back a 409 Conflict. These days, this approach is pretty much the norm, largely thanks to IETF drafts and some reliable techniques that Stripe has been using. (datatracker.ietf.org).
Versioning: Aim to avoid making any changes that might cause issues. Instead, consider using date-based versions tied to each account. You could also throw in a request-level override header for added flexibility. This approach helps keep everything running smoothly and makes updates gradual, much like what Stripe does. If you're looking to switch things up a bit, think about trying out media-type versioning like the way GitHub does with its Accept header. It's a solid approach! (stripe.com).
Webhooks: Just a quick reminder to sign every delivery with HMAC-SHA256. And it's super important that the receivers double-check it using a constant-time comparison to keep things secure! Adding a timestamp is a pretty clever move to help prevent any replay attacks. It’s a simple way to keep things secure! If you're diving into signatures, checking out GitHub's X-Hub-Signature-256 and Stripe's signature scheme would be great places to kick things off. They're pretty reliable examples! (docs.github.com).
API Security: When you're designing your API, remember to keep the OWASP API Security Top 10 (2023) in focus. It’s a smart way to make sure you’re covering all your bases! Make sure you're really on top of how you manage authorization for both objects and properties. It's super important to stay organized with your inventory and versions too. And hey, don't overlook those SSRF protections--especially since they tend to pop up a lot when you're dealing with webhook receivers! (owasp.org).

3) Wallet and identity abstraction (what your API hides)

Get on board with Account Abstraction (ERC‑4337): Make your platform super user-friendly for everyone, whether they’re using Externally Owned Accounts (EOAs) or smart accounts. Offer simple endpoints for tasks like “init, sign, sponsor, and submit,” and streamline the bundler routing to keep things smooth and easy! It's definitely smart to keep those UserOperation fields a bit under wraps. But at the same time, we want to make sure our advanced partners--like paymasters, nonces, and gas caps--still have enough control to do their thing. Balancing security and functionality is key! Check it out here.

Hey there! Just a heads up to keep an eye on the whole Modular Smart-Account thing (you know, ERC-6900). It’d be smart to make sure your roadmap has room for those plug-in validation and execution modules. I’m talking about features like session keys and spend limits, which you’ll want to implement without having to mess around with your API. Trust me, it’ll save you a lot of headaches down the line! If you want to dive deeper into the details, check out erc6900.io. You’ll find all the info you need there!

Stick with EIP-712 Typed Data: If you're looking at off-chain approvals and attestations, EIP-712 is definitely the way to roll. This helps make sure that client wallets display safer prompts, and it also makes it super easy for your services to check if the domains are separated properly. If you want to dive deeper into this topic, check it out here.

4) Chain access layer (how your API speaks to nodes)

When you're diving into EVM networks, it's a good idea to stick with the standard JSON-RPC (EIP-1474). Trust me, it’ll make your life a lot easier! So, when it comes to managing your Ethereum transactions, you really want to focus on a few key things. First off, you can run a safe simulation using eth_call, and don't forget you can use state overrides to tweak things a bit. Next, you've got to estimate those gas costs with eth_estimateGas - it's super helpful! And if you're curious about fees, just check out eth_feeHistory to get some insights. Lastly, make sure to keep an eye on how your transactions are being submitted. It’s all about staying on top of it! Think of your northbound API as the main driver for the entire lifecycle, while the node interface is more like the unsung hero working quietly in the background. (eips.ethereum.org).

When it comes to Dencun/EIP‑4844, if your platform is working with rollups, don't forget to incorporate blob fee telemetry. It's super important to manage those sudden spikes smoothly without causing any hiccups with client contracts. One handy tip is to make sure you’re normalizing those fee hints in your API. It’ll really help things run smoother! Just a heads-up, the "blob gas" market is a whole different animal. It's best to present it as metadata to keep things straightforward for developers. (eips.ethereum.org).

When you're looking at non-EVM projects, it's a good idea to choose clients that offer solid enterprise support. A great example of this is Hyperledger Fabric v2. You could go with 5 LTS for managing permissioned workflows, or check out Besu if you’re looking for EVM permissioning. Both options have their strengths, so it really just depends on what you need! Your API needs to be super flexible, so it can easily work across different ledgers. Meanwhile, the backends can really hone in on their own specific areas of expertise. (toc.hyperledger.org).

5) Observability that follows the transaction

Hey there! Just a quick reminder to incorporate OpenTelemetry along with the W3C Trace Context as you work with your API gateway, orchestrators, queue workers, and any node calls. It’ll help keep everything in sync and make tracking easier! Make sure to pass along the traceparent to any downstream services you’re using. It’s also a good idea to include blockchain details like the transaction hash, block number, and L2 message ID as span attributes. This way, everything stays linked up and easy to track. If you want to dive deeper into this, definitely take a look at the W3C website. There's a ton of info there!

Hey, just a quick reminder to make sure you’re emitting events with AsyncAPI whenever you hit those terminal states. You know, like when something gets submitted, replaced (that’s your nonce bump), included, finalized, or even when there's a reorg. It’s super important to keep track of all that! It's definitely a smart idea to steer clear of any polls from consumers. If you’re looking for more info, check out the AsyncAPI GitHub repository. There’s a ton of useful stuff there!

6) Key custody and cryptography

Hey, just a quick reminder: Whenever you're working in regulated environments, definitely use those FIPS 140-3 validated modules. The CMVP has all the details sorted out in their catalog, along with the timelines, so you’re in good hands there! If you can't set up HSMs from start to finish, why not check out MPC wallets like Fireblocks MPC-CMP or Coinbase WaaS? They're solid alternatives! They'll help you get rid of those pesky single-key custody risks while also making sure you meet your operational SLAs. (csrc.nist.gov).

Hey, just a friendly reminder about the importance of defense-in-depth! Make sure you’re incorporating EIP‑712 signing, origin binding, per-session limits, and some solid policy engines into your wallet API. These steps can really beef up your security game! (eips.ethereum.org).

Concrete API patterns you can ship this quarter

A) Transaction submission you can promise SLOs against

Your public API is organized like this:

Hey there! So, to create a transaction, you just need to send a POST request to /transactions. Make sure your request body includes {to, data, value, chainId}. Oh, and don’t forget to add an Idempotency-Key header too! When you make your request, you'll get back a 202 Accepted response. This will have the resource ID, some predicted fee bands, and a callback_url where you can catch the webhooks.

Your orchestrator: Before you take off, make sure to utilize eth_call to grab any revert reasons. It's super helpful for debugging! Also, don't forget to run eth_estimateGas to get a feel for how much gas you'll need. Lastly, checking out eth_feeHistory can give you some great insights into current fee trends. Happy flying!

Okay, here’s what you need to do: when you want to send transactions, just use eth_sendRawTransaction or go through the ERC‑4337 bundler to handle your operations. Don’t forget to keep an eye on the transaction hash, and for reading purposes, make sure to set your block tag policy to either “safe” or “finalized.”
Keep an eye on stream lifecycle events: You can track confirmations and reorganizations by checking out the AsyncAPI channel at transaction.status. v1`.

This way, you can keep the unpredictable mempool actions separate from a dependable contract. This helps you set up a Service Level Objective (SLO), like aiming for “95% of transactions included within N blocks” for each chain or tier. It’s all about creating some solid expectations! (ethereum.org).

Idempotency Rules:

If you decide to retry a request with the same Idempotency-Key, and everything lines up--the method, path, and body hash--just go ahead and send back the original response. If it doesn’t quite match up, you'll run into a 409 Conflict. Oh, and don’t forget to set a time limit for your key store--try to keep it to about 24 to 48 hours. This way, you can manage your storage more effectively! (stripe.com).

B) Account Abstraction, without leaking complexity

Single POST /aa/user-operations Endpoint

This endpoint handles general intents such as the call target, payload, and sponsorship preference. So, here’s what happens next: your service will whip up a UserOperation or even simulate one, pick a paymaster, and then send it off to a whitelisted EntryPoint. Simple as that! Oh, and there’s this endpoint, GET /aa/user-operations/{id}, that you can use to check on the status of an operation. It’ll let you know if it's “pending,” “included,” or “reverted.” Plus, you’ll get the scoop on any gas fees and billing from the paymaster.

So, here’s the scoop: while you’re busy chatting away using ERC‑4337 JSON‑RPC--like sending calls such as eth_sendUserOperation and checking on those with eth_getUserOperationReceipt--our partners don’t really get to see all that technical stuff happening. It's kind of like the magic happening behind the curtain! This method really helps in managing different bundlers without making too much noise about changes to the EntryPoint. Plus, it ensures that we all have a dependable API to count on. (eips.ethereum.org).

C) Tokenized fund data distribution (NAV) with ISO 20022 alignment

If you’re diving into tokenized fund operations or handling price and NAV data, here’s the scoop on what you should do:

To kick things off, let’s go ahead and set up a REST endpoint. Alright, so you’ll want to use the GET method with the endpoint /funds/{id}/nav. And don’t forget to include OpenAPI 3 in your setup! 1 schemas. Don’t forget to set up an AsyncAPI topic named nav.updated. You can use v1 to get those real-time updates for custodians and brokers. Alright, so next up, let's dive into how you can link your main attributes to the ISO 20022 fields that traditional systems usually use. This makes it super easy for the downstream systems to connect the dots. They can handle stuff like padded dates, instrument IDs, and how precise the decimals need to be. Also, take a look at how DTCC's Smart NAV pilot has really nailed it when it comes to sharing NAV data across various chains! This is a fantastic example of what we call “chain agnostic” data sharing, and it’s something you should totally consider for your API edge! Check it out here: (dtcc.com).

D) Webhooks to partners who must validate every byte

Hey, just a quick reminder: when you're working with the raw request body, don't forget to use HMAC-SHA256 signatures. It'll help keep things secure! Hey, just a quick reminder--make sure you add in your timestamp and the event ID! If you’re on the hunt for some great examples, take a look at GitHub’s webhook validation. It’s definitely considered the gold standard and is a favorite among security teams. (docs.github.com).

When you're dealing with retries, try using exponential backoff. It's a smart way to handle it! If something keeps failing after a certain number of tries (let's call that number N), it's time to mark the event as “dead-lettered.” Oh, and don’t forget to create a replay endpoint that’s secured with role-based access control (RBAC). It's super important for keeping everything safe!

Standards to bake in from day one

OpenAPI 3. 1 for REST: Since it aligns with JSON Schema 2020-12, validation feels a lot smoother, and you won’t have to write as much custom code. Check it out here.
**AsyncAPI 3. So, here’s some cool news: Stream contracts are now getting the spotlight they deserve! They’re no longer just an afterthought; they’re being treated like VIPs.
Check out all the details over on GitHub! Just click here to dive in.
ERC‑4337 and ERC‑6900 for smart-account roadmaps: So, these updates are all about sponsor fees and session keys. If you're looking for more details, definitely check out the Ethereum EIPs page. It's a great resource!
EIP-712: This one's designed to make signatures for approvals and off-chain messages much easier to read. It’s all about making things more user-friendly! Learn more here.
W3C Trace Context with OpenTelemetry: Dive into full end-to-end traces, starting from that "POST /transactions" request all the way to "included at block X." "Take a look at this over on the W3C site! You can find it right here. Enjoy!"
OWASP API Security Top 10 (2023): So, these guidelines are now being included in design reviews, which means we’re putting security front and center right from the start. Pretty cool, right? If you want to dive deeper into the details, you can check it out here. There's a lot of useful info waiting for you!
FIPS 140‑3 CMVP: If you’re working with regulated keys or looking to meet federal procurement standards, this is definitely something you can’t overlook. For all the nitty-gritty details, just hop on over to the NIST website right here. It's all laid out for you!

Integration with today’s financial plumbing (what changed in 2025)

Hey there! Just wanted to give you a quick update on ISO 20022. So, the coexistence period for those key cross-border MT payment instructions officially ended on November 22, 2025. Keep that in mind! If you're still sending MTs, just a heads-up that you might run into some extra fees and have to deal with some backup processing. Now's a great time to double-check that your API lines up nicely with MX messages and ticks all the boxes for those structured data requirements. Oh, and just a heads-up: you should definitely start prepping for those E&I case management flows to switch over to ISO-native soon--likely within the next couple of years. (swift.com).

Tokenization momentum: Exciting news! On December 11, 2025, DTCC received an SEC no-action letter, which is a big win for them. This means they’re gearing up to tokenize some important assets held by DTC, like those Russell 1000 stocks, ETFs, and U.S. We'll kick off the production of Treasuries in a controlled setting during the latter half of 2026. So, get ready for a boost in API traffic linking traditional finance identifiers, like CUSIPs, with token contracts. It's going to be interesting to see how this all plays out! Keep that in mind when you're designing your IDs and events. It's super important! (dtcc.com).
Project Guardian (MAS): So, the frameworks for fixed income (GFIF) and funds (GFF) are really setting the stage for how we handle tokenized products.
If you’re dealing with global financial institutions, it’s super important to ensure your APIs match their data fields and that they meet their Delivery vs. Payment (DvP) settlement expectations from the start. It’ll save you a lot of headaches down the line! (icmagroup.org).
Ethereum Dencun/EIP-4844: Rollups are stepping up their game by using blobs to make data availability more affordable. Just a heads-up: when you’re working on your fee models and Service Level Objectives (SLOs) for inclusion, make sure to factor in those blob base fee dynamics. But don’t forget to keep your northbound API running smoothly. It's all about finding that balance! (eips.ethereum.org).

Example: an OpenAPI + AsyncAPI skeleton (production-ready essentials)

# openapi.yaml (excerpt)
openapi: 3.1.0
info:
  title: 7Block Labs Transactions API
  version: 2025-12-15
servers:
  - url: https://api.example.com
paths:
  /transactions:
    post:
      summary: Submit a transaction intent
      operationId: submitTransaction
      parameters:
        - name: Idempotency-Key
          in: header
          required: true
          schema: { type: string, minLength: 10, maxLength: 64 }
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                chainId: { type: integer }
                to: { type: string, pattern: "^0x[a-fA-F0-9]{40}$" }
                data: { type: string, pattern: "^0x[a-fA-F0-9]*$" }
                value: { type: string, pattern: "^0x[0-9a-fA-F]+$" }
                callback_url: { type: string, format: uri }
              required: [chainId, to]
      responses:
        '202':
          description: Accepted
          headers:
            Stripe-Version:
              schema: { type: string }
              description: Example of date-based versioning header pinning.
          content:
            application/json:
              schema:
                type: object
                properties:
                  id: { type: string }
                  status: { type: string, enum: [pending] }
                  fee_hint:
                    type: object
                    properties:
                      maxFeePerGas: { type: string }
                      maxPriorityFeePerGas: { type: string }

# asyncapi.yaml (excerpt)
asyncapi: 3.0.0
info:
  title: 7Block Labs Transaction Events
  version: 2025-12-15
channels:
  transaction.status.v1:
    subscribe:
      message:
        name: TxStatus
        payload:
          type: object
          properties:
            id: { type: string }
            chainId: { type: integer }
            txHash: { type: string }
            status: { type: string, enum: [submitted, replaced, included, finalized, reorged, failed] }
            blockNumber: { type: integer, nullable: true }
            error: { type: string, nullable: true }

These specs totally cover input validation, idempotency, and a solid event contract. Plus, they give you the flexibility to change up your node providers, rollup setups, or account abstraction bundlers whenever you want. It's all about making things easier and more adaptable for you! Take a look at this link: (learn.openapis.org). You’ll find some useful info there!

Five emerging best practices worth adopting now

1) Treat “fee estimation” as a service, not a client concern

Alright, so here’s the plan: we need to create a GET endpoint at /fees. This endpoint is going to tap into the eth_feeHistory method, and we’ll make sure to follow the per-chain policy while we’re at it. Let’s get this up and running! This way, you can keep your client code stable even as protocols evolve--like when blob base fees change after Dencun, for instance. Take a look at this link: anukul.js.org. You'll find some interesting info there!

2) Persisted/Whitelisted GraphQL Queries for Internal Apps

When it comes to our internal consoles and business intelligence tools, utilizing persisted GraphQL queries really makes a difference. They help us keep our costs under control and boost caching right at the edge. If you're looking to explore this topic further, I highly recommend checking out graphql-js.org. There’s a lot of great stuff there that can really help you out!

3) Replay-safe webhooks by construction

Using HMAC, timestamps, and idempotent receivers turns retries from a potential security risk into a super handy feature. It’s like having a safety net that actually works for you! Don’t forget to add verifiers in your SDKs! They’re super important. Take a look at the info in the documentation. You'll find everything you need there!

4) Security Reviews Against OWASP API Top 10 (2023)

Hey team! Just a quick reminder to make sure you're including Property Level Authorization checks in your code review templates. It's super important! Also, don’t skip running SSRF tests for any webhooks or URL fetchers you come across. Oh, and while we're at it, remember to do those API inventory checks during your CI process. It all helps keep our stuff secure and running smoothly! Thanks! If you want to dive deeper into this topic, check out owasp.org for more info.

5) Dual‑rail identifiers for tokenization

When you're putting together any resource or event, it's crucial to make sure you include both finance-native IDs, like CUSIP or ISIN, as well as on-chain IDs, which would be things like contract addresses and token IDs. This helps keep everything connected and clear! Given how DTCC and ISO 20022 are progressing, it's become really important for getting things to work together smoothly. If you want to dive deeper into this topic, you can find more info here. It’s worth a look!

Pitfalls we repeatedly see (and how API-first prevents them)

Implementing gas logic directly on the client side. Just one event can throw those assumptions out the window. It's probably a good idea to keep it server-side behind /fees. That way, we get more variety in nodes and policies, which is a real plus. Take a look at this: (anukul.js.org). You might find it pretty interesting!
Submissions that are "fire-and-forget" and don’t really have any lifecycle events attached to them. Polling can be a bit hit or miss, honestly. You’d be surprised how often reorganizations pop up! How about streaming your status changes through an event bus with AsyncAPI contracts? It’s a cool way to keep everything moving smoothly! Take a look at it here: GitHub. You'll find some really neat stuff!
Unverifiable webhooks
To keep things running smoothly with your integrations, just keep in mind that companies usually hit pause if there’s a lack of guidance or examples when it comes to signature verification. It’s always good to have those resources on hand! Don't forget to add that in! You can find all the details right here: (docs.github.com).
Keys that don't have FIPS narratives. While it might not be set in stone, you can definitely count on procurement and audits to take notice. It's definitely a smart move to choose FIPS 140-3 validated modules or hardware security modules (HSMs). They really add an extra layer of security and give you peace of mind. When you’re checking out MPC vendors, definitely look for ones that provide clear attestations. It’s super important! Take a look at this! You can find it right here: csrc.nist.gov.

Rollout checklist (what to demand from your teams and vendors)

Interface Contracts
Hey, guess what? We’ve got OpenAPI 3 now! 1 and AsyncAPI 3. Hey, just a quick update! We’ve kicked off the check on our source code, so our continuous integration (CI) system is currently hard at work validating those schemas.
We've got our API versioning policy all laid out and it’s ready for you to check out. We've rolled out per-account pinning, so you can now manage things more easily. Plus, you'll notice that deprecation headers and a change log process are all included in the mix. Check it out over at stripe.com!
Reliability Hey everyone! Just wanted to give you a heads-up that we’re making the Idempotency-Key a requirement for all the mutating endpoints. So, just a quick heads-up: keys usually stick around for about 24 to 48 hours. Plus, we have some pretty clear-cut rules--thanks to those 409 semantics--for when conflicts arise. You can dive into the nitty-gritty details over here: datatracker.ietf.org. So, here’s the deal with our SLOs: they're pretty simple. We focus on inclusion within N blocks for each chain or tier, and we’ve set our sights on a webhook delivery success rate of at least 99%. 9% daily.
Security So, we've taken a good look at the OWASP API Top 10 and made sure to align our endpoints with those safeguards. Plus, we've really tightened up our webhook receivers to protect against SSRF attacks. On top of that, we're also signing our webhooks with timestamps and using constant-time comparisons to keep things secure. You can check out more about this here. Hey there! Just a quick note about our custody strategy--it’s been all squared away to meet the FIPS 140‑3 or MPC standards. Plus, we’re also incorporating EIP‑712 for those signing flows that are easy to read. You can check out more details here!
Observability Thanks to OpenTelemetry, our traces cover everything from the gateway to the orchestrator and all the way to the node, and we’ve got the txHash as one of the attributes. We're also sending out AsyncAPI metrics and keeping a close watch on our dead-letter queues. You can check out more about it here.
Finance Integration We've got ISO 20022 covered for both payment and asset messages. We're keeping our NAV/tokenized fund events in line with what’s happening in the market. Plus, we've got some exciting plans lined up for the 2026 E&I message milestones. You can check out more about it over at swift.com.

Why API-first wins politically inside large organizations

It provides the compliance, risk, and partner teams with something tangible to actually work with. After all, having documents is so much more helpful than just talking about it! (Docs > promises. ).
It really helps minimize the risks that come along with protocol changes--like we’re seeing with Dencun today and who knows what’s on the horizon for tomorrow. By supporting your API with reliable changes, you're better equipped to handle those shifts. (blog.ethereum.org).
It really brings tokenization to life! By combining traditional identifiers with on-chain state right within the same contract, it stays aligned with ISO 20022 and the latest industry trials. (swift.com).

Final thought

When you start your blockchain project, it’s super important to pay attention to your interfaces and policies. If you don’t, you might find yourself dealing with subpar SDKs, messy partner integrations, and a pile of incident reports packed with confusing technical terms from block explorers. Trust me, you don't want to go down that road! But let me tell you, when you go with an API-first approach, it really shifts the game. You end up delivering clear contracts instead of dealing with those frustrating surprises!

Hey there! If you’re in need of a solid design review or want our team to create some tailored OpenAPI or AsyncAPI specs just for you--whether it’s for things like AA, tokenization, or settlement--look no further! At 7Block Labs, we’re ready to help you go from those initial ideas straight to smashing your production SLOs. Let’s make it happen!