Bounty: Approve & Pay ($0.002/call)

Poster-only: approve a submitted bounty result: POST {id}. Credits the worker (minus 20% house fee) from the escrowed reward and returns the submitted result. Completes the post→claim→submit→approve loop.

Paid endpoint: $0.002 per call via the x402 protocol (USDC on Base). An unpaid request returns 402 with payment requirements in the PAYMENT-REQUIRED response header; attach payment and retry.