Use Codex with Letter
BankSync's MCP server can let Codex query supported Letter account data that you have connected through BankSync and authorized for API access. Query your finances in natural language without spreadsheets or exports.
BankSync is not affiliated with, endorsed by, sponsored by, or partnered with Letter or Codex. Names are used only to describe potential account-data coverage and client compatibility.
How to connect Codex to Letter
Search for Letter in BankSync
Sign up for BankSync and, if Letter is available, link your account through a provider-hosted or bank-hosted authorization flow.
Generate an API key
Create an API key from the Developers section of your BankSync workspace.
Configure Codex
Add the BankSync MCP server to Codex using your API key. Follow our Codex setup guide for step-by-step instructions.
Start querying
Ask Codex about supported Letter transactions, balances, and more using natural language.
Codex MCP Configuration
Add this configuration to let Codex query supported Letter account data through BankSync.
[mcp_servers.banksync]
url = "https://mcp.banksync.io"
[mcp_servers.banksync.http_headers]
X-API-Key = "bsk_your_key_here"What Codex can access from Letter
Accounts
List the Letter accounts connected through BankSync and visible to the API key scopes you grant.
Transactions
Query supported Letter transactions with provider-supplied dates, descriptions, amounts, merchants, and categories.
Balances
Get current and available balances for supported Letter accounts.
Holdings
View supported investment positions, quantities, and market values from Letter.
Trades
Access supported investment trade and activity history from Letter.
Loans
Check supported loan balances and provider-supplied liability details from Letter.
Ready to connect Codex to Letter?
Start your 14-day free trial. Connect your bank, generate an API key, and start querying data in minutes.
Use Letter with another agent
The same BankSync MCP server and API key work with every one of these.
Other banks you can use with Codex
Institutions in the same market that Codex can query through BankSync MCP.
- Use Chase with Codex🇺🇸 United States
- Use American Express with Codex🇺🇸 United States
- Use Capital One with Codex🇺🇸 United States
- Use Wells Fargo with Codex🇺🇸 United States
- Use Citibank Online with Codex🇺🇸 United States
- Use Fidelity with Codex🇺🇸 United States
- Use Bank of America with Codex🇺🇸 United States
- Use Charles Schwab with Codex🇺🇸 United States
BankSync is not affiliated with, endorsed by, or an official partner of Codex or Letter. All product names and trademarks are the property of their respective owners. Bank connections are established through regulated open banking providers.