Serverless x402 Implementation

Stack: Netlify Functions (Node.js), Viem. Repository: asap-oracle

This is a live API endpoint that strictly enforces the protocol. It is stateless and serverless.

The Verification Logic (oracle.ts)

When a request hits this endpoint, the logic flows as follows:

1. Header Check: Does Authorization: Bearer <HASH> exist?
   • No: Return HTTP 402. Body includes:
     text

     { "error": "Payment Required", "payment_details": { "recipient": "0x...", "amount": "1.0", "token": "0x..." } }
2. Proof Verification (The Critical Step):
   • If a Hash is provided, the function initializes a PublicClient connected to Sepolia RPC.
   • It calls getTransactionReceipt(hash).
   • Check 1: Is status === 'success'?
   • Check 2: Does the receipt contain a Transfer log emitted by the official ASAPToken contract?
   • (In a full prod env, we would also decode the log to ensure the to address matches the Oracle's wallet, but checking the log existence is sufficient for the hackathon).
3. Data Release: If valid, return HTTP 200 with the JSON payload (Prediction, Confidence, Secret).