1d ago
TUTORIAL:
(1 of 5) GM builders — Let your APIs earn while you build. Plug FastAPI or Express into X402 and turn every request into on-chain revenue—no invoices, no middlemen, just automated payments around the clock.
Website -
Docs -
(2 of 5) Python gang —
Next, install the packages: pip install openlibx402-core openlibx402-fastapi fastapi
Then copy the `.env` file, add your wallet address and USDC mint details, and run:
python
Open Swagger at `your-biz-domain/docs` to see free and premium routes — premium calls will return 402 payment required errors until your USDC payment clears.
(3 of 5) Express maxis —
npm install @openlibx402/client @openlibx402/core @openlibx402/express @solana/web3.js dotenv express
Then, build and start the project:
npm run build && npm start
This sets up flexible price endpoints, on-chain verification, and a market-ready user experience.
(4 of 5) LangChain autopays —
Python stack needs
`openlibx402-core openlibx402-client openlibx402-langchain langchain langchain-openai openai python-dotenv solders solana`;
JS stack wants
`@openlibx402/langchain @langchain/core @langchain/openai @langchain/langgraph @solana/web3.js dotenv langchain`.
Fund the generated wallets, watch agents rip through 402s with safety caps off-course.
(5 of 5) Impact —
Meter AI inference and tiered premium drops — let agents settle payments instantly.
No subscriptions, no ads—just seamless pay-per-call infrastructure. “Bots paying bots” is the future of business. Deploy your setup, fam, and demonstrate the timeline for how degen commerce should really feel.
(*) End of the thread. Accelerate.
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