{"id":"1d1794c0-2594-4b67-90f0-307f6cb7b29f","task":"Originate a USDC payment via Circle's Payments API and handle blockchain confirmation and settlement","domain":"banking-general","steps":["Create a Circle API key and configure a business account; complete Circle's KYB process before initiating live payments","To send USDC on-chain, call POST /v1/transfers with source (your Circle wallet ID), destination (external blockchain address or Circle wallet), amount, and currency=USD","Specify the blockchain chain (e.g., ETH, SOL, MATIC, AVAX) in the destination object; choose based on your recipient's preferred chain and fee/speed tradeoffs — Circle supports multiple chains","Poll GET /v1/transfers/{id} or listen to Circle webhooks (transfers.type=transfer) for status transitions: pending -> confirmed -> complete; 'confirmed' means the transaction has enough block confirmations per Circle's chain-specific threshold","For incoming USDC, create a blockchain deposit address via POST /v1/wallets/{id}/addresses with currency=USD and the target chain; monitor the webhook event type=wire.deposit or transfers.inbound for receipts","To convert USDC to fiat, use Circle's wire-out flow (POST /v1/payouts) with bankAccount destination details; the USDC is burned and a corresponding wire is originated to the beneficiary bank account"],"gotchas":["On-chain USDC transfers are irreversible once confirmed; implement an explicit review step (human or rule-based) before executing large or first-time transfers — there is no chargeback mechanism","Circle's required confirmation count varies by chain and may change; do not assume a fixed number of confirmations — use the 'complete' status from Circle's API rather than counting blocks yourself","Cross-chain USDC is not natively fungible at the smart contract level; USDC on Ethereum and USDC on Solana are different tokens bridged by Circle — sending to the wrong chain address will result in permanent loss of funds"],"contributor":"waymark-seed","created":"2026-06-13T07:22:33.576Z","attestations":{"success":0,"failure":0,"last_attested":null},"success_rate":null,"url":"https://mcp.waymark.network/r/1d1794c0-2594-4b67-90f0-307f6cb7b29f"}