> ## 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. # Withdraw funds > Converts your Circle-Match-only USDC balance to USD and wires it to the specified fiat account. This exit path is for mint-side participants only; burn-side USDC releases automatically when orders fill or are cancelled. No Circle Mint burn fee applies. ## OpenAPI ````yaml openapi/match.yaml post /v1/match/withdrawals openapi: 3.1.0 info: title: Circle Match API description: > The Circle Match API provides endpoints for Circle Match, a periodic batch-auction venue that coordinates USDC burn demand with USDC mint demand for eligible Circle Mint customers. ## Authentication All REST endpoints require a Bearer token: ``` Authorization: Bearer ``` ## WebSocket Real-time auction state and account events are delivered over a persistent WebSocket connection at `wss://api.circle.com/v1/match/ws` (production) or `wss://api-sandbox.circle.com/v1/match/ws` (sandbox). Obtain a short-lived ticket with `POST /v1/match/ws/ticket`, then pass two `Sec-WebSocket-Protocol` values in the upgrade request: - `circle-match.v1` - `ticket.` — the ticket value, prefixed with `ticket.` After connection, subscribe to the `market` channel for public auction state or the `account` channel for private order and fill events. See the Circle Match WebSocket reference for the full protocol specification. ## Error codes | Code | HTTP | Description | |--------|------|-------------| | 136001 | 400 | Auction locked — cancellations and less-competitive fee changes not accepted | | 136002 | 400 | Auction settling — try again after settlement completes | | 137001 | 400 | Insufficient available balance | | 137002 | 400 | Invalid wallet | | 137003 | 400 | Wallet not found | | 137004 | 409 | Idempotency key reused with different parameters | | 137005 | 400 | Fee change not more competitive during lock window | | 137006 | 409 | Self-match violation — open order on opposite side of same auction | | 137007 | 400 | Invalid fiat account | | 137008 | 400 | Maximum orders per auction reached | | 137009 | 400 | Transaction limit exceeded | | 137010 | 400 | Entity not eligible for Circle Match | | 138001 | 400 | Withdrawal amount exceeds available balance | | 138002 | 400 | Withdrawal request invalid | | 138003 | 404 | No Circle Match account found for this entity | | 138004 | 400 | Invalid withdrawal destination | | 139001 | 400 | Circle Match wallet invalid | version: 1.0.0 servers: - url: https://api.circle.com description: Production - url: https://api-sandbox.circle.com description: Sandbox security: - BearerAuth: [] tags: - name: Account description: Account balance and activity summary - name: Orders description: Place, list, retrieve, cancel, and modify orders - name: Withdrawals description: Withdraw restricted mint-side USDC - name: WebSocket description: Obtain a WebSocket connection ticket paths: /v1/match/withdrawals: post: tags: - Withdrawals summary: Withdraw funds description: >- Converts your Circle-Match-only USDC balance to USD and wires it to the specified fiat account. This exit path is for mint-side participants only; burn-side USDC releases automatically when orders fill or are cancelled. No Circle Mint burn fee applies. operationId: createWithdrawal requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/WithdrawalRequest' example: idempotencyKey: 9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d amount: amount: '1000.00' currency: USD fiatAccountId: 550e8400-e29b-41d4-a716-446655440001 responses: '201': description: Withdrawal submitted content: application/json: schema: type: object required: - data properties: data: $ref: '#/components/schemas/Withdrawal' example: data: id: 7a2b3c4d-5e6f-7890-abcd-ef1234567890 status: pending '400': description: >- Bad request. Error codes: `137001` — insufficient available balance; `137009` — transaction limit exceeded; `138001` — withdrawal amount exceeds available balance; `138002` — request invalid; `138004` — invalid destination. content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/Error' '404': description: No Circle Match account found for this entity (error 138003) content: application/json: schema: $ref: '#/components/schemas/Error' example: code: 138003 message: No Circle Match wallet found components: schemas: WithdrawalRequest: type: object required: - idempotencyKey - amount - fiatAccountId properties: idempotencyKey: type: string format: uuid description: Unique UUID v4 per withdrawal request example: 9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d amount: allOf: - $ref: '#/components/schemas/Money' description: Amount to withdraw. Must be positive with currency USD. fiatAccountId: type: string format: uuid description: Fiat account that receives the USD wire example: 550e8400-e29b-41d4-a716-446655440001 Withdrawal: type: object required: - id - status properties: id: type: string format: uuid description: Unique identifier for this withdrawal example: 7a2b3c4d-5e6f-7890-abcd-ef1234567890 status: type: string description: >- Current status of the withdrawal, passed through from the payout processor. example: pending Error: type: object required: - code - message properties: code: type: integer description: Circle error code example: 137001 message: type: string description: Human-readable error description example: Insufficient available balance Money: type: object description: A monetary amount with its currency required: - amount - currency properties: amount: type: string description: Decimal amount as a string, rounded to 2 decimal places example: '500.00' currency: type: string description: ISO 4217 currency code example: USD securitySchemes: BearerAuth: type: http scheme: bearer ````