Tallymark API

The Tallymark API gives your code and your AI agents access to the clients, invoices, subscriptions, sales pages, and tax rates in your account. It takes JSON request bodies, returns JSON responses with amounts in cents and dates in UTC, and uses standard HTTP status codes.

Use GET to list and retrieve records, and POST for everything else: POST /invoices creates an invoice, and POST /invoices/{id}/send sends it.

Base URL

All requests go to this base URL.

https://api.tallymark.com

OpenAPI specification

Download the OpenAPI spec to generate an SDK, import it into an API tool like Postman, or give it to your agent.