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Invoicing, payments, accounting, expense tracking, and financial management tools for small businesses.
Openness note: API and Zapier on the MAX plan only.
Free, open-source headless commerce platform.
Pay.sh lets your AI agents pay for any API call without creating accounts, managing API keys, or setting up subscriptions.
Grab a 15-minute chat. We don't sell software, so we have no stake in which one you use.
Openness note: API and Zapier on The Works package only. The vendor can revoke API access.
Openness note: Local SDK only, on Windows. Support ends by version: 2023 editions ended 31 May 2026.
Developer payment platform (formerly Braintree).
Duplicate — Braintree rebranded to PayPal Enterprise Payments.
Openness note: REST API included on the free-to-start plan. Scheduled export of transactions and currency data. Own integrations directory.