{"endpoint":"/api/subscribe/credit","method":"POST","shape":{"subscription_id":"string (required)","tx_hash":"string (required) - on-chain transaction hash","chain":"string (required) - one of: bitcoin | ethereum | solana | usdc_bsc | usdc_sol | usdc_base | usdc_eth","amount_usd":"number (required) - USD value of payment, e.g. 5.00"},"rate":"1 credit per USD 0.05 (so 1 USDC = 20 credits = 20 event deliveries)","flow":["1. Send crypto to the address for your chosen chain (see /agents.json#payment).","2. POST to this endpoint with subscription_id + tx_hash + chain + amount_usd.","3. Receive a claim_id with status: pending.","4. Operator (or v0.3 automated verifier) reconciles against on-chain data.","5. On confirmation, credits are added to your subscription. Status flips to confirmed."],"addresses":"See /agents.json#payment for live attested addresses.","payment_attestation":"See /payment-attestation.json for canonical hash."}