Monetiser des APIs avec x402 et USDC
La monetisation API fonctionne mieux lorsque le paiement est proche de l acces. x402 permet a une API de retourner une exigence de paiement puis de liberer la reponse apres paiement.
Pick the right resource
Do not start by charging every endpoint. Pick one resource where the value is obvious and the response is deterministic enough to price.
A clear resource boundary also makes it easier to debug payment mismatches and explain pricing to developers.
- Use a stable public URL
- Bind the rule to a specific HTTP method
- Set a price that makes sense per request
- Write a short description agents and developers can understand
Design the payment flow
The first request should return a 402 challenge when no valid payment payload is present. After payment verification succeeds, the same route can return the protected data.
This flow keeps API access stateless from the user perspective and avoids prepaid balances for small, high-frequency usage.
Operate it like billing infrastructure
Treat each paid request as a financial event. Store payment records, make retries idempotent, and expose clear logs for support and reconciliation.
- Verify resource URL and method exactly
- Reject expired payment payloads
- Deduplicate nonce or authorization identifiers
- Record settlement status and transaction hash
Next steps
If you are ready to integrate, continue with the PolyPay x402 integration guide or the JavaScript SDK documentation.