> ## 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.
> ## Agent Instructions
> Before reading these docs, install the relevant Circle Skill to get pre-loaded context — skills are LLM-optimized and cover architecture decisions, correct flows, and common pitfalls. In Claude Code: run /plugin marketplace add circlefin/skills then /plugin install circle-skills@circle. With Vercel Skills CLI: run npx skills add circlefin/skills. Available skills: use-usdc https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-usdc/SKILL.md (balances, transfers, approvals on EVM and Solana); EURC has no skill — see https://developers.circle.com/stablecoins/what-is-eurc.md; bridge-stablecoin https://github.com/circlefin/skills/blob/master/plugins/circle/skills/bridge-stablecoin/SKILL.md (crosschain transfers via CCTP, USDC, EURC, and third-party assets); use-arc https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-arc/SKILL.md (Arc chain config, contract deployment, USDC bridging — Arc docs: https://docs.arc.io/llms.txt); use-circle-wallets https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-circle-wallets/SKILL.md (choose wallet type); use-developer-controlled-wallets https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-developer-controlled-wallets/SKILL.md (custodial wallets for payouts and treasury); use-user-controlled-wallets https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-user-controlled-wallets/SKILL.md (embedded wallets with Web2 login); use-modular-wallets https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-modular-wallets/SKILL.md (smart contract wallets with passkeys and ERC-4337); use-gateway https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-gateway/SKILL.md (unified USDC balance, nanopayments); use-smart-contract-platform https://github.com/circlefin/skills/blob/master/plugins/circle/skills/use-smart-contract-platform/SKILL.md (deploy, interact, monitor contracts). Pair any skill with the Circle MCP server for live SDK signatures, contract addresses, and chain IDs: {"mcpServers":{"circle":{"url":"https://api.circle.com/v1/codegen/mcp"}}}.
> Read the product overview first. Each product has an overview explaining when and why to use it. Read it before quickstarts.
> Pick the right wallet type. Developer-controlled (you hold keys), user-controlled (end user holds keys via PIN/social login), or modular (smart contract wallets with passkeys). See https://developers.circle.com/wallets.md.
> Use CCTP V2 for crosschain transfers. CCTP natively transfers USDC and EURC via burn-and-mint, and supports permissionless wrapping of third-party assets via lock-and-mint. V1 is legacy; always use V2 unless V1 is specified or the chain requires it (Noble, Sui, and Aptos still require V1). Migration guide: https://developers.circle.com/cctp/migration-from-v1-to-v2.md.
> Use Bridge Kit for frontend bridging. Wraps CCTP with a simpler SDK for user-facing apps. Use CCTP directly for backend transfers.
> Gas Station vs Paymaster. Gas Station sponsors gas for Circle Wallet transactions. Paymaster lets users pay gas in USDC. Different use cases — read both overviews.
> Gateway Nanopayments for sub-cent payments. Gasless USDC micropayments down to $0.000001 via x402 and batched settlement. For pay-per-request APIs, AI agent payments, streaming.
> Look up USDC addresses per chain. Never hardcode — use https://developers.circle.com/stablecoins/usdc-contract-addresses.md.
> Prefer SDKs over raw API calls. Node.js and Python SDKs handle auth, retries, and errors.
> API key required. Bearer token in Authorization header. Testnet and mainnet use separate keys and may use different base URLs depending on the product.
> Set up webhooks when available. Most operations are async. Webhooks deliver transaction confirmations and state changes.
> When calling list endpoints, paginate using pageSize and pageAfter until no nextPageAfter cursor is returned—stopping at the first page silently misses records.
> Building an AI agent? Start with the Agent Stack—Circle CLI, agent wallets, and nanopayments built for autonomous use cases: https://developers.circle.com/agent-stack.md.
# Release notes - Circle Mint - 2025
> 2025 release notes for Circle Mint
## December 2025
Added support for EURC on World Chain.
### Documentation updates
Updated the following documentation to reflect EURC support on World Chain:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
Added support for USDC on the Starknet blockchain.
### Documentation updates
Updated the following documentation to reflect USDC support on Starknet:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
## November 2025
Added support for USDC on the Monad blockchain.
### Documentation updates
Updated the following documentation to reflect USDC support on Monad:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
## September 2025
Added support for USDC on the Ink blockchain.
### Documentation updates
Updated the following documentation to reflect USDC support on Ink:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
Added support for USDC on the Plume blockchain.
### Documentation updates
Updated the following documentation to reflect USDC support on Plume:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
Added support for USDC on the XDC blockchain.
### Documentation updates
Updated the following documentation to reflect USDC support on XDC:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
Added support for USDC on the HyperEVM blockchain.
### Documentation updates
Updated the following documentation to reflect USDC support on HyperEVM:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
Relaunched the Crypto Payouts API.
### Documentation updates
Updated the following topics to reflect changes to the Crypto Payouts API in the
relaunch:
* [Resource Data Models](/circle-mint/circle-api-resources)
* [Notifications Data Models](/circle-mint/notifications-data-models)
* [API and Entity Errors](/circle-mint/circle-apis-api-errors)
* [Quickstart: Crypto Payouts](/circle-mint/crypto-payouts)
### API updates
Made the following changes to the Crypto Payouts API endpoints:
* Updated the [`/v1/payouts`](/api-reference/circle-mint/payouts/create-payout)
endpoint with an accurate listing of supported currencies
* Updated the enum of supported chains in the
[`/v1/addressBook/recipients`](/api-reference/circle-mint/payouts/create-address-book-recipient)
endpoint
## July 2025
Added support for USDC on the Sei blockchain.
### Documentation updates
Updated the following documentation to reflect USDC support on Sei:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
## June 2025
Added support for USDC on the Codex blockchain.
### Documentation updates
Updated the following documentation to reflect USDC support on Codex:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
Added support for USDC on Ripple Ledger (XRPL).
### Documentation updates
Updated the following documentation to reflect USDC support on XRPL:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
Added support for USDC on World Chain.
### Documentation updates
Updated the following documentation to reflect USDC support on World Chain:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
## May 2025
Added support for USDC bridge to native upgrade for Sonic.
### Documentation updates
Updated the following documentation to reflect Sonic support:
* [Circle Mint Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies)
* [Circle Mint Blockchain Confirmations](/circle-mint/references/blockchain-confirmations)
## April 2025
Ensure API documentation accurately reflects available features of Circle Mint.
### API updates
* Removed APIs for deprecated products and products that never officially
launched. The following APIs were removed:
* Pull Crypto Payments
* Cards
* Payment Tokens
* Settlements
* Checkout Sessions
* The following endpoints were deprecated and removed from the Crypto Deposits
API:
* `POST /payments`
* `POST /payments/{id}/capture`
* `POST /payments/{id}/cancel`
* `POST /payments/{id}/refund`
* Renamed the Payments API to the Crypto Deposits API
* Renamed the Payouts API to the Crypto Payouts API
* Removed unsupported blockchains listed in the following endpoints:
* [`POST /addressBook/recipients`](/api-reference/circle-mint/payouts/create-address-book-recipient)
* [`POST /paymentIntents`](/api-reference/circle-mint/payments/create-payment-intent)
## March 2025
Added support for USDC on the Linea blockchain.
### Documentation updates
Updated the following documents to reflect USDC on Linea support:
* [Blockchain confirmations](/circle-mint/references/blockchain-confirmations#confirmations)
* [Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies#usdc)
### API updates
* Added `LINEA` to the list of supported chains.
* Added `UNI` to the list of supported chains.
Major clean up of the Circle Mint documentation. Removed references to
deprecated products and updated out-of-date information.
## February 2025
Added support for USDC on the Unichain blockchain.
### Documentation updates
Updated the following documents to reflect USDC on Unichain support:
* [Blockchain confirmations](/circle-mint/references/blockchain-confirmations#confirmations)
* [Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies#usdc)
## January 2025
Added support for USDC on the Aptos blockchain.
### Documentation Updates
Updated the following documents to reflect USDC on Aptos support:
* [Blockchain confirmations](/circle-mint/references/blockchain-confirmations#confirmations)
* [Supported Chains and Currencies](/circle-mint/references/supported-chains-and-currencies#usdc)
### API updates
* Added `APTOS` to the list of supported chains
France is now available as a travel rule entity. Began deprecating CBIT support.
### API additions
* Added France to the
[`POST /businessAccount/wallets/addresses/recipient`](/api-reference/circle-mint/account/create-business-recipient-address)
endpoint
* Added `SUI` and `ZKS` to the list of supported chains
### API updates
* Removed CBIT endpoint documentation
* Removed `FLOW` and `TRX` from the list of supported chains