> ## Documentation Index > Fetch the complete documentation index at: https://docs.compasslabs.ai/llms.txt > Use this file to discover all available pages before exploring further. # Initiate USDC bridging > Bridge USDC to any chain for any Product account using Circle's CCTP Protocol. **Transfer modes:** - `standard` (default): ~15-19 minute transfers, **free** (no fee) - `fast`: ~30 second transfers, requires a small fee (typically ~0.01%) The fee for fast mode is automatically calculated based on Circle's current rates. **Flow:** 1. Call this endpoint with `gas_sponsorship=false` to get an unsigned transaction, or `gas_sponsorship=true` to get EIP-712 typed data for gas-sponsored execution 2. Owner signs the transaction or typed data 3. Broadcast the transaction on the source chain (or submit to `/gas_sponsorship/prepare`) 4. Wait for Circle's attestation service to attest the burn 5. Call the mint endpoint to receive USDC on the destination chain **Supported chains:** - Ethereum (domain 0) - Arbitrum (domain 3) - Base (domain 6) **Note:** The USDC must already be deposited in the Product Account. If approval is needed for the TokenMessengerV2 contract, it will be included in the transaction automatically. ## OpenAPI ````yaml /v2/combined_spec.json post /v2/cctp/burn openapi: 3.1.0 info: title: Compass API description: Compass Labs DeFi API version: 0.0.1 servers: - url: https://api.compasslabs.ai description: Production server security: - ApiKeyAuth: [] paths: /v2/cctp/burn: post: tags: - Bridge summary: Initiate USDC bridging description: >- Bridge USDC to any chain for any Product account using Circle's CCTP Protocol. **Transfer modes:** - `standard` (default): ~15-19 minute transfers, **free** (no fee) - `fast`: ~30 second transfers, requires a small fee (typically ~0.01%) The fee for fast mode is automatically calculated based on Circle's current rates. **Flow:** 1. Call this endpoint with `gas_sponsorship=false` to get an unsigned transaction, or `gas_sponsorship=true` to get EIP-712 typed data for gas-sponsored execution 2. Owner signs the transaction or typed data 3. Broadcast the transaction on the source chain (or submit to `/gas_sponsorship/prepare`) 4. Wait for Circle's attestation service to attest the burn 5. Call the mint endpoint to receive USDC on the destination chain **Supported chains:** - Ethereum (domain 0) - Arbitrum (domain 3) - Base (domain 6) **Note:** The USDC must already be deposited in the Product Account. If approval is needed for the TokenMessengerV2 contract, it will be included in the transaction automatically. operationId: v2_cctp_burn requestBody: content: application/json: schema: $ref: '#/components/schemas/DepositForBurnRequest' required: true responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/DepositForBurnResponse' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' x-codeSamples: - lang: python label: Python (SDK) source: |- from compass_api_sdk import CompassAPI, models with CompassAPI( api_key_auth="", ) as compass_api: res = compass_api.bridge.cctp_burn(owner="0x06A9aF046187895AcFc7258450B15397CAc67400", chain=models.DepositForBurnRequestChain.ARBITRUM, amount="3", destination_chain=models.DestinationChain.BASE, gas_sponsorship=True, transfer_mode=models.DepositForBurnRequestTransferMode.STANDARD) # Handle response print(res) - lang: typescript label: Typescript (SDK) source: |- import { CompassApiSDK } from "@compass-labs/api-sdk"; const compassApiSDK = new CompassApiSDK({ apiKeyAuth: "", }); async function run() { const result = await compassApiSDK.bridge.cctpBurn({ owner: "0x06A9aF046187895AcFc7258450B15397CAc67400", chain: "arbitrum", amount: "3", destinationChain: "base", gasSponsorship: true, transferMode: "standard", }); console.log(result); } run(); components: schemas: DepositForBurnRequest: properties: owner: type: string title: Owner description: >- The primary wallet address that owns and controls the Product Account. examples: - '0x29F20a192328eF1aD35e1564aBFf4Be9C5ce5f7B' default: '0x06A9aF046187895AcFc7258450B15397CAc67400' chain: type: string enum: - ethereum - arbitrum - base title: Chain description: The source chain where USDC will be burned. examples: - base - ethereum - arbitrum default: arbitrum amount: anyOf: - type: number exclusiveMinimum: 0 - type: string pattern: ^(?!^[-+.]*$)[+-]?0*\d*\.?\d*$ title: Amount description: >- The amount of USDC to bridge (in token units, e.g., 100.5 for 100.5 USDC). examples: - 100 - 1000.5 default: '3' destination_chain: type: string enum: - ethereum - arbitrum - base title: Destination Chain description: The destination chain where USDC will be minted. examples: - ethereum - arbitrum - base default: base gas_sponsorship: type: boolean title: Gas Sponsorship description: >- Optionally request gas sponsorship. If set to `true`, EIP-712 typed data will be returned that must be signed by the `owner` and submitted to the 'Prepare gas-sponsored transaction' endpoint (`/gas_sponsorship/prepare`). default: false examples: - true transfer_mode: type: string enum: - fast - standard title: Transfer Mode description: >- Transfer speed mode. 'fast': ~30 second transfers using confirmed finality (requires a small fee taken from transfer amount). 'standard': ~15-19 minute transfers using full finality (free, no fee). Default is 'standard'. default: standard examples: - standard - fast type: object required: - owner - chain - amount - destination_chain title: DepositForBurnRequest default: owner: '0x06A9aF046187895AcFc7258450B15397CAc67400' chain: arbitrum amount: '3' destination_chain: base gas_sponsorship: true transfer_mode: standard DepositForBurnResponse: properties: bridge_id: anyOf: - type: string - type: 'null' title: Bridge Id description: >- Unique bridge identifier for tracking this cross-chain transfer. Use this ID when calling /mint/prepare to complete the transfer. Only present when Redis is configured on the server. examples: - br_a1b2c3d4e5f6 transaction: anyOf: - $ref: '#/components/schemas/UnsignedTransaction' - type: 'null' description: >- Unsigned transaction for direct execution. Present when gas_sponsorship=false. eip_712: anyOf: - $ref: '#/components/schemas/BatchedSafeOperationsResponse-Output' - type: 'null' description: >- EIP-712 typed data for gas-sponsored execution. Present when gas_sponsorship=true. transfer_mode: type: string enum: - fast - standard title: Transfer Mode description: >- The transfer speed mode used. 'fast' uses confirmed finality (~30s), 'standard' uses full finality (~15-19 min). examples: - standard - fast fee: anyOf: - type: string pattern: ^(?!^[-+.]*$)[+-]?0*\d*\.?\d*$ - type: 'null' title: Fee description: >- Fee amount in USDC charged for this transfer. Only present for fast mode. Standard mode transfers are free (fee is None or 0). examples: - 0.01 - null estimated_time_seconds: type: integer title: Estimated Time Seconds description: Estimated time to complete the bridge in seconds. examples: - 30 - 900 type: object required: - transfer_mode - estimated_time_seconds title: DepositForBurnResponse description: >- Response model for CCTP depositForBurn transaction from a smart account. Contains either an unsigned transaction for direct submission or EIP-712 typed data for gas-sponsored transactions. Also includes a bridge_id for tracking the cross- chain transfer. example: bridge_id: br_a1b2c3d4e5f6 estimated_time_seconds: 900 transaction: chainId: '0x2105' data: >- 0x8d80ff0a0000000000000000000000000000000000000000000000000000000000000020 from: '0x4A83b4413CF41C3244027e1590E35a0F48403F0c' gas: '0x7a120' maxFeePerGas: '0x59682f00' maxPriorityFeePerGas: '0x3b9aca00' nonce: '0x5' to: '0x6B90E8B4E3E971E74C1A47a3a20976377E2dB4b1' value: '0x0' transfer_mode: standard HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError UnsignedTransaction: properties: chainId: type: string title: Chainid description: The chain id of the transaction data: type: string title: Data description: The data of the transaction from: type: string title: From description: The sender of the transaction gas: anyOf: - type: string - type: 'null' title: Gas description: The gas of the transaction to: type: string title: To description: The recipient of the transaction value: type: string title: Value description: The value of the transaction nonce: type: string title: Nonce description: The nonce of the address maxFeePerGas: type: string title: Maxfeepergas description: The max fee per gas of the transaction maxPriorityFeePerGas: type: string title: Maxpriorityfeepergas description: The max priority fee per gas of the transaction type: object required: - chainId - data - from - gas - to - value - nonce - maxFeePerGas - maxPriorityFeePerGas title: UnsignedTransaction example: chainId: '0x2105' data: >- 0x1688f0b900000000000000000000000029fcb43b46531bca003ddc8fcb67ffe91900c762000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000675f4a3d from: '0x4A83b4413CF41C3244027e1590E35a0F48403F0c' gas: '0x7a120' maxFeePerGas: '0x59682f00' maxPriorityFeePerGas: '0x3b9aca00' nonce: '0x5' to: '0x4e1DCf7AD4e460CfD30791CCC4F9c8a4f820ec67' value: '0x0' BatchedSafeOperationsResponse-Output: properties: domain: $ref: >- #/components/schemas/compass__api_backend__v2__models__safe__transact__response__batched_safe_operations__EIP712Domain description: EIP-712 domain separator types: $ref: >- #/components/schemas/compass__api_backend__v2__models__safe__transact__response__batched_safe_operations__EIP712Types description: EIP-712 type definitions primaryType: type: string const: SafeTx title: Primarytype description: Primary type for the structured data message: $ref: '#/components/schemas/SafeTxMessage' description: Safe transaction message data type: object required: - domain - types - primaryType - message title: BatchedSafeOperationsResponse description: Response containing EIP-712 typed data for Safe transaction signing. example: domain: chainId: 8453 verifyingContract: '0x6B90E8B4E3E971E74C1A47a3a20976377E2dB4b1' message: baseGas: '0' data: >- 0x8d80ff0a0000000000000000000000000000000000000000000000000000000000000020 gasPrice: '0' gasToken: '0x0000000000000000000000000000000000000000' nonce: '7' operation: 1 refundReceiver: '0x0000000000000000000000000000000000000000' safeTxGas: '0' to: '0x93C23AAE4793C14D6DF35D2A2A2234204e1559dA' value: '0' primaryType: SafeTx types: EIP712Domain: - name: chainId type: uint256 - name: verifyingContract type: address SafeTx: - name: to type: address - name: value type: uint256 - name: data type: bytes - name: operation type: uint8 - name: safeTxGas type: uint256 - name: baseGas type: uint256 - name: gasPrice type: uint256 - name: gasToken type: address - name: refundReceiver type: address - name: nonce type: uint256 ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type type: object required: - loc - msg - type title: ValidationError compass__api_backend__v2__models__safe__transact__response__batched_safe_operations__EIP712Domain: properties: chainId: type: integer title: Chainid description: Chain ID verifyingContract: type: string title: Verifyingcontract description: Address of the Product Account type: object required: - chainId - verifyingContract title: EIP712Domain description: The EIP-712 domain separator. compass__api_backend__v2__models__safe__transact__response__batched_safe_operations__EIP712Types: properties: EIP712Domain: items: $ref: '#/components/schemas/EIP712DomainField' type: array title: Eip712Domain description: EIP712Domain type definition SafeTx: items: $ref: '#/components/schemas/SafeTxField' type: array title: Safetx description: SafeTx type definition type: object required: - EIP712Domain - SafeTx title: EIP712Types description: The type definitions for EIP-712 structured data. SafeTxMessage: properties: to: type: string title: To description: Destination address value: type: string title: Value description: Value in wei as a string data: type: string title: Data description: Transaction data as hex string operation: $ref: '#/components/schemas/OperationType' description: Operation type (0=Call, 1=DelegateCall) safeTxGas: type: string title: Safetxgas description: Gas for the transaction baseGas: type: string title: Basegas description: Base gas costs gasPrice: type: string title: Gasprice description: Gas price gasToken: type: string title: Gastoken description: Token address for gas payment refundReceiver: type: string title: Refundreceiver description: Address to receive gas refund nonce: type: string title: Nonce description: Transaction nonce type: object required: - to - value - data - operation - safeTxGas - baseGas - gasPrice - gasToken - refundReceiver - nonce title: SafeTxMessage description: The message data for the transaction. EIP712DomainField: properties: name: type: string title: Name type: type: string title: Type type: object required: - name - type title: EIP712DomainField description: A field in the EIP712Domain type definition. SafeTxField: properties: name: type: string title: Name type: type: string title: Type type: object required: - name - type title: SafeTxField description: A field in the SafeTx type definition. OperationType: type: integer enum: - 0 - 1 title: OperationType description: Safe operation types. securitySchemes: ApiKeyAuth: type: apiKey in: header name: x-api-key description: >- Your Compass API Key. Get your key [here](https://www.compasslabs.ai/dashboard). ````