0n3
MCP servers · QuickBooks · MCP server

Connect Codex CLI to QuickBooks

One line gives Codex CLI your QuickBooks account as tools: 21 endpoints, invoices, customers, payments, called with your own connection. No key in the prompt, a receipt for every call, revoke Codex CLI's access alone any time.

Get the line for Codex CLIConnect QuickBooks first

Three steps

  1. Create a free 0n3 account and connect QuickBooks. Paste a key or sign in; it lands in your vault, encrypted.
  2. Install 0n3 into Codex CLI. OpenAI's terminal agent reads 0n3 over Streamable HTTP with a token from your environment.
  3. Ask Codex CLI: whoami. Then: "Create an invoice in QuickBooks".
Put the token in your environment
export ON3_TOKEN="<your 0n token>"

Add it to your shell profile so Codex finds it next time.

The line above carries a placeholder; 0n3.app/install mints a real key named for Codex CLI and fills it in.

What Codex CLI can then do in QuickBooks

Invoices · Create and send invoices4
Create an invoicePOST /company/{realmId}/invoice
List invoicesGET /company/{realmId}/query
Get an invoiceGET /company/{realmId}/invoice/{invoiceId}
Send an invoicePOST /company/{realmId}/invoice/{invoiceId}/send
Customers · Manage customers4
Create a customerPOST /company/{realmId}/customer
List customersGET /company/{realmId}/query
Get a customerGET /company/{realmId}/customer/{customerId}
Update a customerPOST /company/{realmId}/customer
Payments · Record and list payments2
Create a paymentPOST /company/{realmId}/payment
List paymentsGET /company/{realmId}/query
Accounts · Chart of accounts management2
List accountsGET /company/{realmId}/query
Get an accountGET /company/{realmId}/account/{accountId}
Bills · Create and track bills2
Create a billPOST /company/{realmId}/bill
List billsGET /company/{realmId}/query
Estimates · Create and send estimates2
Create an estimatePOST /company/{realmId}/estimate
Send an estimatePOST /company/{realmId}/estimate/{estimateId}/send

All 21 QuickBooks endpoints →

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