MCP servers · Plaid · connector · GPT action
Connect ChatGPT to Plaid
One line gives ChatGPT your Plaid account as tools: 9 endpoints, links, accounts, transactions, called with your own connection. No key in the prompt, a receipt for every call, revoke ChatGPT's access alone any time.
Three steps
- Create a free 0n3 account and connect Plaid. Paste a key or sign in; it lands in your vault, encrypted.
- Install 0n3 into ChatGPT. A custom connector in Developer mode, or an Action on a custom GPT from the OpenAPI spec.
- Ask ChatGPT: whoami. Then: "Create a link token in Plaid".
Custom connector (needs Developer mode)
- Settings → Connectors (or Apps) → Advanced → Developer mode on
- Create → name 0n3 · MCP server URL https://0n3.app/mcp · Authentication: OAuth
- Finish the sign-in with your 0n account
- Enable the connector in a chat and ask: "whoami"
ChatGPT connectors cannot send a static header, so 0n3 signs you in through its OAuth door (dynamic client registration is on).
The line above carries a placeholder; 0n3.app/install mints a real key named for ChatGPT and fills it in.
What ChatGPT can then do in Plaid
Links · Create link tokens and exchange public tokens1
Create a link token
POST /link/token/createAccounts · List accounts and get balances2
Get accounts
POST /accounts/getGet a balance
POST /accounts/balance/getTransactions · List and sync transactions2
Get transactions
POST /transactions/getSync transactions
POST /transactions/syncIdentity · Retrieve identity information1
Get an identity
POST /identity/getAuth · Get account and routing numbers1
Get an auth
POST /auth/getMore · Everything else this app exposes.2
Exchange public token
POST /item/public_token/exchangeGet institutions
POST /institutions/getPlaid in other AI clients
Claude Code + PlaidMCP server + skillClaude (desktop & claude.ai) + PlaidconnectorCodex CLI + PlaidMCP serverGemini CLI + PlaidMCP serverCursor + PlaidMCP serverVS Code (Copilot) + PlaidMCP serverWindsurf + PlaidMCP server