An API that charges a few cents of USDC per request using HTTP 402 payments that agents settle automatically.
The Brief
Wrap any useful endpoint (image caption, weather, a premium dataset) behind an x402 paywall. Unpaid requests get a 402 Payment Required response with payment details; an agent client pays in stablecoins and retries without a human in the loop. Show a live 'toll log' of payments and requests so builders can watch machines pay machines.
Vibe Aesthetic
Retro-futurist highway tollbooth, neon receipts
Key Features
- HTTP 402 payment challenge and verification middleware
- Agent client that pays and retries automatically
- Per-request USDC pricing with a live revenue ticker
- Public toll log of settled payments
Optional Jev Layer
TypeSafe Jev (System One) can sit beside your LLM for fast, typed routing and gates—you can ship v1 without it and add this layer when you want calibrated decisions in code.
- Jev classifies API tier, toll eligibility, and abuse/fraud scores before returning HTTP 402
Suggested Stack
Swap in whatever you like. Ship on a testnet first, and keep agent spending limits enforced onchain, not just in the prompt.
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