> ## Documentation Index
> Fetch the complete documentation index at: https://na-834f3010.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Circle

> Developer wallets, CCTP, Gateway, nanopayments, contracts, Mint, USDC/EURC.

<img src="https://mintcdn.com/na-834f3010/zqkgru7uBeifcSo_/images/brand/circle-mark.png?fit=max&auto=format&n=zqkgru7uBeifcSo_&q=85&s=3222f6c86c7e9eabfa9532e030cfe1e5" alt="Circle" className="h-10" width="800" height="800" data-path="images/brand/circle-mark.png" />

`CIRCLE_API_KEY` talks to `api.circle.com`. `CIRCLE_MINT_API_KEY` talks to Circle Mint (`api-sandbox.circle.com` in sandbox). Do not mix keys.

| Group        | Actions                                                                                  |
| ------------ | ---------------------------------------------------------------------------------------- |
| Wallets      | Wallet sets, wallets, balances, transfers, sign typed data                               |
| CCTP V2      | Deposit-for-burn, Iris attestation, receive/mint, domains                                |
| Gateway      | Balances, transfer attestation                                                           |
| Nanopayments | Deposit, balance, x402 check/pay/settle, agent discovery, withdraw                       |
| Contracts    | Import, deploy bytecode/template, monitors, logs                                         |
| USDC / EURC  | Lookup, balance, transfer, approve. Arc native USDC is 18-dec; ERC-20 is 6-dec           |
| Mint         | Ping, balances, transfers, payment intents, payouts. Wires need `confirmDestructive=yes` |