Open Finance MCP
Access your bank data in ChatGPT & Claude via Open Finance
118 followers
Access your bank data in ChatGPT & Claude via Open Finance
118 followers
What if your AI assistant could see your actual bank statements? The Open Finance Data MCP connects your bank account to ChatGPT, Claude, and any MCP-compatible AI — through Brazil's Open Finance. Ask about spending, get summaries, analyze patterns in natural language. No account needed — authenticate via Open Finance (your CPF + your bank). Your data, your control — revoke anytime. Setup takes 2 minutes. Built by Cumbuca, a licensed Payment Institution in Brazil.
Cumbuca
@bruno_cury Does multi-bank mean multiple MCP server instances, or one server handling multiple consents? The five-query-per-day limit makes me wonder how this works once you connect a second bank.
Raycast
Cumbuca
@chrismessina Brazilian banks only!
This is actually crazy, didn't know you could just plug Open Finance data straight into an AI agent like this. The built-in governance is what makes this actually usable in the real world. We need something like this for India's AA framework too honestly. How does it handle cases where the data owner needs to manually approve access?
Cumbuca
@yash_singhal9 Would love to see an MCP for AA framework!!!
On manual approval: the flow is actually quite elegant. When you connect an account, we (as a licensed ITP) initiate the consent request, you get redirected to your own bank's interface, where you authenticate and explicitly approve what data you're sharing and for how long. Then you get redirected back to the app with an active consent. It's essentially OAuth, but for financial data, standardized at the protocol level and enforced by the Central Bank, so giving consent to get your data from any institution in Brazil has the exact same flow. No one can skip it or shortcut it.
Revocation is symmetric: you can go back to your bank's interface at any time and kill the consent. The MCP gets an authorization error on the next API call immediately.
Styleguide
The idea is great and is something we really need in the community. But unfortunately it doesn’t work. I’ve tried both with Claude and custom connector for a week and it always fails. I sent an email to support several days ago (which I would prefer rather than a public message), but got no answer.
I really hope the launch is a success eventually and well taken care of even for the free tier.
Cumbuca
@caiovaccaro Hi Caio, I'm Pedro, CTO at Cumbuca. I'm sorry that happened to you. While we try to test as much as possible, there's always some combination of specific MCP client implementation + OS that we might not have checked. If you would still like to try our product out, free to email me at tech (at) cumbuca (dot) com and we'll check what might be going on with your connection to the server.
Looks cool! But how about the privacy aspects?
Cumbuca
@sriram_gkPrivacy is actually a core constraint of the protocol, not just a policy, the whole thing runs on Brazil's regulated Open Finance infrastructure, which is governed by the Central Bank and subject to LGPD (Brazil's data protection law, analogous to GDPR).
A few specifics: you can only link an account that shares your own tax ID (CPF), so there's no way to access someone else's data. Consent is explicit and scoped, you choose which accounts and data types to share, and can revoke it anytime from your bank's own app. The MCP never touches credentials; it receives an access token after you've authenticated and consented through your bank directly. We don't store financial data also, each call fetches live data within the scope of your active consent.
Connecting bank data directly to AI assistants sounds useful… but I’d definitely think twice before linking financial accounts.