Circle
Circle Internet Financial is the issuer of USDC and EURC and operates a developer platform for moving regulated stablecoin money across the internet. Their APIs cover programmable wallets (developer- and user-controlled), gas sponsorship, the Cross-Chain Transfer Protocol (CCTP), Gateway unified balances, the Smart Contract Platform, the Circle Payments Network (CPN) for cross-border payments, compliance, StableFX trading on Arc, and xReserve for issuing USDC-backed stablecoins.
APIs
Developer-Controlled Wallets
Create and manage server-side wallets where the application controls private keys via Circle's secure key management. Supports balances, transfers, signing, and webhook notifica...
User-Controlled Wallets
Create wallets that end users control via PIN, biometrics, or social recovery while Circle handles the cryptography. Used to embed non-custodial USDC wallets directly inside con...
Gas Station and Paymaster
Sponsor gas fees on behalf of users or let users pay gas in USDC via Circle Paymaster, removing native-token friction from onboarding.
Cross-Chain Transfer Protocol (CCTP)
Burn-and-mint protocol for moving native USDC between supported blockchains without wrapped assets. Provides REST endpoints for attestations and a Bridge Kit SDK for frontend in...
Circle Gateway
Unified USDC balance across multiple EVM chains and support for nanopayments down to $0.000001 of USDC.
Smart Contract Platform
Deploy, query, and interact with smart contracts across supported blockchains, including ERC-20 and ERC-721 templates and arbitrary contract calls.
Circle Payments Network (CPN)
A network for regulated financial institutions to settle cross-border payments using USDC, with originating and beneficiary financial institution (OFI/BFI) APIs.
Compliance Engine
Screen wallet addresses and transactions against sanctions lists and risk signals; configure rule sets and review queues for AML programs.
StableFX
Stablecoin foreign-exchange trading API on the Arc blockchain for converting between USDC, EURC, and other regulated stablecoins.
xReserve
Issue and redeem regulated stablecoins backed by USDC reserves; manage minting, burning, and reserve attestations.