> ## 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. # Get all settlements > Returns all settlements. ## OpenAPI ````yaml openapi/cross-currency.yaml get /v1/exchange/trades/settlements openapi: 3.0.2 info: version: ${version} title: Cross-Currency API description: > The Circle Cross-Currency API allows you to exchange fiat for USDC and exchange USDC for EURC. servers: - url: https://api-sandbox.circle.com - url: https://api.circle.com security: [] tags: - name: Trades description: Execute currency exchange trades. - name: Payments description: Payment endpoints. - name: Settlements description: Settlement endpoints paths: /v1/exchange/trades/settlements: get: tags: - Settlements summary: Get all settlements description: Returns all settlements. operationId: getSettlements parameters: - $ref: '#/components/parameters/From' - $ref: '#/components/parameters/To' - $ref: '#/components/parameters/PageBefore' - $ref: '#/components/parameters/PageAfter' - $ref: '#/components/parameters/PageSize' - name: type description: The type of settlement. in: query required: false schema: type: string enum: - account_payable - account_receivable - name: status description: Status of the settlement. in: query required: false schema: $ref: '#/components/schemas/SettlementStatus' - name: currency description: Currency of the settlement. in: query required: false schema: type: string enum: - MXN - BRL - name: category in: query required: false description: | Filters settlements by trade currency category. - `swap` — stablecoin ↔ stablecoin trades. - `fiat` — trades where at least one leg is a fiat currency. schema: type: string enum: - swap - fiat - $ref: '#/components/parameters/ClientEntityId' responses: '200': description: Successfully retrieved settlements. headers: X-Request-Id: $ref: '#/components/headers/XRequestId' content: application/json: schema: title: GetSettlementsResponse properties: data: type: array items: $ref: '#/components/schemas/Settlement' examples: response: value: data: - id: b8627ae8-732b-4d25-b947-1df8f4007a29 entityId: b8627ae8-732b-4d25-b947-1df8f4007a29 status: pending createDate: '2020-04-10T02:13:30.000Z' updateDate: '2020-04-10T02:13:30.000Z' details: - id: b8627ae8-732b-4d25-b947-1df8f4007a29 type: payable amount: amount: '3.14' currency: USDC status: pending reference: FXR1234567 fiatAccountId: a3f1b2c4-d5e6-7890-abcd-ef1234567890 expectedPaymentDueAt: '2020-04-10T02:13:30.000Z' createDate: '2020-04-10T02:13:30.000Z' updateDate: '2020-04-10T02:13:30.000Z' '401': $ref: '#/components/responses/NotAuthorized' '404': $ref: '#/components/responses/NotFound' security: - bearerAuth: [] components: parameters: From: name: from description: Queries items created since the specified date-time (inclusive). in: query required: false schema: type: string format: date-time example: '2020-04-10T02:13:30.000Z' To: name: to description: Queries items created before the specified date-time (inclusive). in: query required: false schema: type: string format: date-time example: '2020-04-10T02:13:30.000Z' PageBefore: name: pageBefore description: > A collection ID value used for pagination. It marks the exclusive end of a page. When provided, the collection resource will return the next `n` items before the id, with `n` being specified by `pageSize`. The items will be returned in the natural order of the collection. The resource will return the first page if neither `pageAfter` nor `pageBefore` are specified. SHOULD NOT be used in conjuction with pageAfter. in: query required: false schema: type: string PageAfter: name: pageAfter description: > A collection ID value used for pagination. It marks the exclusive begin of a page. When provided, the collection resource will return the next `n` items after the id, with `n` being specified by `pageSize`. The items will be returned in the natural order of the collection. The resource will return the first page if neither `pageAfter` nor `pageBefore` are specified. SHOULD NOT be used in conjuction with pageBefore. in: query required: false schema: type: string PageSize: name: pageSize description: > Limits the number of items to be returned. Some collections have a strict upper bound that will disregard this value. In case the specified value is higher than the allowed limit, the collection limit will be used. If avoided, the collection will determine the page size itself. in: query required: false schema: type: integer minimum: 1 example: 5 ClientEntityId: name: clientEntityId description: >- Identifier of the client entity. Filters results to fetch only resources associated with the specified client entity. in: query required: false schema: type: string format: uuid example: a3f1b2c4-d5e6-7890-abcd-ef1234567890 schemas: SettlementStatus: type: string description: Status of the settlement. enum: - pending - settled Settlement: type: object properties: id: $ref: '#/components/schemas/Id' entityId: $ref: '#/components/schemas/Id' status: $ref: '#/components/schemas/SettlementStatus' createDate: $ref: '#/components/schemas/UtcTimestamp' updateDate: $ref: '#/components/schemas/UtcTimestamp' details: type: array items: type: object properties: id: $ref: '#/components/schemas/Id' type: type: string enum: - payable - receivable amount: $ref: '#/components/schemas/FxMoney' status: $ref: '#/components/schemas/SettlementDetailStatus' reference: type: string example: FXR1234567 fiatAccountId: type: string format: uuid description: >- The ID of the fiat account associated with this settlement detail. example: a3f1b2c4-d5e6-7890-abcd-ef1234567890 expectedPaymentDueAt: $ref: '#/components/schemas/UtcTimestamp' createDate: $ref: '#/components/schemas/UtcTimestamp' updateDate: $ref: '#/components/schemas/UtcTimestamp' Id: type: string description: Unique system generated identifier for the entity. format: uuid example: b8627ae8-732b-4d25-b947-1df8f4007a29 UtcTimestamp: type: string description: ISO-8601 UTC date/time format. example: '2020-04-10T02:13:30.000Z' FxMoney: type: object required: - amount - currency properties: amount: description: Magnitude of the amount, in units of the currency, with a `.`. type: string example: '3.14' currency: $ref: '#/components/schemas/FxCurrency' SettlementDetailStatus: type: string enum: - pending - completed FxCurrency: type: string enum: - USDC - EURC - MXN - BRL headers: XRequestId: description: >- Universally unique identifier (UUID v4) for the request. Helpful for identifying a request when communicating with Circle support. schema: type: string format: uuid example: 2adba88e-9d63-44bc-b975-9b6ae3440dde responses: NotAuthorized: description: >- The request has not been applied because it lacks valid authentication credentials. headers: X-Request-Id: $ref: '#/components/headers/XRequestId' content: application/json: schema: type: object title: NotAuthorized required: - code - message properties: code: type: integer example: 400 message: type: string example: Something went wrong. example: code: 401 message: Malformed authorization. examples: response: value: code: 401 message: Malformed authorization. NotFound: description: The specified resource was not found. headers: X-Request-Id: $ref: '#/components/headers/XRequestId' content: application/json: schema: type: object title: NotFound required: - code - message properties: code: type: integer example: 400 message: type: string example: Something went wrong. example: code: 404 message: Not found. examples: response: value: code: 404 message: Not found. securitySchemes: bearerAuth: type: http scheme: bearer ````