The vaults.fyi API is now open with pay-as-you-go access

In 2025 we built the vaults.fyi app to showcase our API. Since then, hundreds of millions of dollars have gone through app.vaults.fyi, and companies including Kraken, Jumper, and Gauntlet have started using the same API in their own products.

The focus on enterprise clients meant that up until today our API was gated behind forms, DMing Ryan on Telegram, getting on an onboarding call and so on. 

In the meantime, LLMs have made APIs accessible to a much wider set of builders, including people who would not have used one directly a year ago.

So we are happy to announce that the vaults.fyi Developer Portal is now open to everyone. You can sign up, create a key, and start using the same infrastructure that’s powering vaults.fyi app: yield discovery, portfolio tracking, historical data, reputation scores, warnings, and ready-to-sign transaction payloads across protocols and chains.

This is especially valuable if you want to cover more than one DeFi protocol. Each protocol has its own contract layout, accounting model, transaction parameters, approval flow, withdrawal mechanics, risk model, and position logic. We turn those protocol-specific flows into one standard API and SDK integration.

Doesn’t matter if you’re a hobbyist who builds a DeFi dashboard for a side project or a privacy-oriented investor who wants to track their wallets via a local app. From now on you can start for free and pay only for API credits you use, without any commitments. 

And there are some cool things you can do with our API.

What can you use our API for

We built the API to cover the full user story: from vault discovery, through transaction building, up to post-transaction P&L tracking.

Discovery

If you want to show users information about vaults you can display holder distribution, TVL, APY and Reputation Score, warnings and TVL drawdowns..

You can also track all wallet interactions with a particular vault, see how the vault’s share price evolved and much more.

At the moment we cover 1,000+ vaults on 20+ networks.

Transaction

You can create deposit and withdraw widgets with standardized transaction flows, so users can move from discovery to execution with fewer steps. You can also include any vault-specific information about redemptions.

Because all the data and flows are standardized, you can connect multiple protocols without custom integrations.

Post-transaction

After a user makes a deposit, they can track their P&L. They can also compare their results to other wallets like the EF's DeFi Wallet:

TVL tracking

For select partners, vaults.fyi also supports TVL attribution so integrators and vault providers can track which apps are driving deposits.

If you want to learn more about this feature, reach out to ryan@wallfacer.io.

If you want to dig in, you can learn about all API options in our Docs. Or just ask your LLM to summarize them.

Chat with your favorite LLM using reliable data

We also have an MCP server.

This means you can connect our data to your Claude and ask “How much am I currently earning across all my positions?”, “What are the highest-yield vaults on Base” or even tell it to create a tx to “Deploy $1,000 from my Safe to these 3 vaults”.

If you want to learn how to set it up, read our post about MCP or check the MCP docs.

Start whenever you want and stay in control

In our API Portal you can track your credit spend. You can see which endpoints you're hitting, how often, and how many credits you’ve spent. 

It’s particularly useful if you want to give vaults.fyi access to your agent, as it lets you see which API credits it’s spending. And if you run out of credits, you can add your credit card and top up. 

Also, if you sign up now you can get free 3,000 API credits.

If you want to check how it works, sign up at portal.vaults.fyi, grab a key, and make your first call. If you build something interesting with our data, feel free to tag @vaultsfyi while sharing it on Twitter.