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Documentation Index

Fetch the complete documentation index at: https://developers.circle.com/llms.txt

Use this file to discover all available pages before exploring further.

Circle offers two broad types of developer products, permissioned and permissionless products. Permissioned products require a Circle developer account and an API key, where permissionless products can be integrated with directly with no authentication with Circle. Permissionless products are marked on the cards on this page, all other products are permissioned.

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Assets

USDC

Digital dollar stablecoin for payments and DeFi

EURC

Euro-backed stablecoin for European markets

xReserve

Stablecoins backed 1:1 by USDC reserves

USYC

Tokenized yield-bearing US Treasury product

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Build onchain apps

Use Arc App Kit to build onchain apps fasterApp Kit is ideal when you want common payment and liquidity flows across blockchains without implementing each step from scratch. The Circle Wallets adapter uses your account credentials so App Kit can access dev-controlled wallets and Circle Contracts.

Wallets: Dev-Controlled

Create wallets and manage them on behalf of your users

Wallets: Modular

Create flexible, customizable wallets with modules

Wallets: User-Controlled

Let your users control their own wallets

Gas Station

Sponsor network fees for your users

Contracts

Build and manage smart contracts

Paymaster

Pay gas fees with USDC

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Crosschain transfers

Use dedicated SDKs for crosschain transfersBridge Kit and Unified Balance Kit let you move USDC across blockchains without low-level protocol work. Both support multiple blockchains and wallet providers.

CCTP

Move USDC natively between chains

Gateway

Enable a unified USDC balance

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Payments

Circle Payments Network

Global, real-time settlement

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Mint & FX

Mint

Access and distribute USDC liquidity

StableFX

Integrate FX for stablecoins