Integrate a payment system for AI applications, allowing users to pay for their own usage without upfront costs.
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echo has 542 stars on GitHub. It has been forked 89 times. echo is written mainly in TypeScript. It has been in active development since 2025. Its main topics are anthropic, billing, gemini, llm.
What is echo?
The User Pays AI SDK
Is echo open source?
echo is an open-source project.
Is echo free?
Yes. echo is free and open source — you can use, modify and self-host it.
What language is echo written in?
echo is written mainly in TypeScript.
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