> ## Documentation Index > Fetch the complete documentation index at: https://docs.rhinestone.dev/llms.txt > Use this file to discover all available pages before exploring further. # Prepare a gasless permit deposit > Experimental. Builds the EIP-712 token-authorization payload the owner signs to authorize their deposit smart account to pull `amount` of `token` from their wallet — no on-chain transfer needed. Selects ERC-3009, ERC-2612, then Permit2; validates the route, session coverage, domain, balance, and allowance before the user is asked to sign. The server chooses replay and deadline fields; submit the signature with the same fields via POST /deposits/permit. EVM source chains only; cross-chain routes only (v1). ## OpenAPI ````yaml https://raw.githubusercontent.com/rhinestonewtf/openapi/refs/heads/main/deposit-service.json post /deposits/permit/prepare openapi: 3.1.0 info: title: Deposit Service API version: 1.0.0 description: >- Cross-chain deposit processing service with automatic token bridging and gas sponsorship servers: - url: https://v1.orchestrator.rhinestone.dev/deposit-processor security: [] paths: /deposits/permit/prepare: post: tags: - Processing summary: Prepare a gasless permit deposit description: >- Experimental. Builds the EIP-712 token-authorization payload the owner signs to authorize their deposit smart account to pull `amount` of `token` from their wallet — no on-chain transfer needed. Selects ERC-3009, ERC-2612, then Permit2; validates the route, session coverage, domain, balance, and allowance before the user is asked to sign. The server chooses replay and deadline fields; submit the signature with the same fields via POST /deposits/permit. EVM source chains only; cross-chain routes only (v1). parameters: - schema: type: string description: API key for authentication (omit when sending Authorization) example: your-api-key required: false description: API key for authentication (omit when sending Authorization) name: x-api-key in: header - schema: type: string description: >- Bearer platform token (e.g. forwarded by user-service). Takes precedence over `x-api-key` when both are present. example: Bearer eyJhbGciOi... required: false description: >- Bearer platform token (e.g. forwarded by user-service). Takes precedence over `x-api-key` when both are present. name: authorization in: header requestBody: content: application/json: schema: $ref: '#/components/schemas/PermitDepositPrepareRequest' responses: '200': description: Typed data to sign, with the server-chosen nonce and deadline content: application/json: schema: $ref: '#/components/schemas/PermitDepositPrepareResponse' '400': description: >- Malformed request, unsupported source chain, same-chain route, or owner funding insufficient (code PERMIT-4) content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: Missing/invalid API key or expired platform bearer token content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: >- API key lacks the deposits write scope, or permit deposits are disabled content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '404': description: Account not found or not owned by the caller content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '422': description: >- Route cannot settle (whitelist violation, unsupported token route, or no session for the source chain) content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' components: schemas: PermitDepositPrepareRequest: type: object properties: account: type: string pattern: ^0x[a-fA-F0-9]{40}$ description: Ethereum address (0x followed by 40 hex characters) example: '0x742d35Cc6634C0532925a3b844Bc9e7595f5bE91' sourceChain: type: string pattern: ^[a-z0-9]+:[a-zA-Z0-9]+$ description: CAIP-2 chain identifier (e.g. "eip155:8453") example: eip155:8453 token: type: string pattern: ^0x[a-fA-F0-9]{40}$ description: Ethereum address (0x followed by 40 hex characters) example: '0x742d35Cc6634C0532925a3b844Bc9e7595f5bE91' amount: type: string pattern: ^\d+$ description: Numeric string representing a bigint value example: '1000000000000000000' owner: type: string pattern: ^0x[a-fA-F0-9]{40}$ description: Ethereum address (0x followed by 40 hex characters) example: '0x742d35Cc6634C0532925a3b844Bc9e7595f5bE91' kind: type: string enum: - auto - erc3009 - erc2612 - permit2 description: >- Authorization scheme preference. Auto selects ERC-3009, then ERC-2612, then Permit2. example: auto required: - account - sourceChain - token - amount - owner PermitDepositPrepareResponse: oneOf: - type: object properties: available: type: boolean enum: - true authorization: anyOf: - type: object properties: kind: type: string enum: - erc3009 typedData: $ref: '#/components/schemas/PermitTypedData' nonce: type: string pattern: ^0x[a-fA-F0-9]{64}$ description: ERC-3009 bytes32 authorization nonce example: >- 0x000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f validAfter: type: string pattern: ^\d+$ description: Numeric string representing a bigint value example: '1000000000000000000' validBefore: type: string pattern: ^\d+$ description: Numeric string representing a bigint value example: '1000000000000000000' required: - kind - typedData - nonce - validAfter - validBefore - type: object properties: kind: type: string enum: - erc2612 - permit2 typedData: $ref: '#/components/schemas/PermitTypedData' nonce: type: string pattern: ^\d+$ description: Numeric string representing a bigint value example: '1000000000000000000' deadline: type: string pattern: ^\d+$ description: Numeric string representing a bigint value example: '1000000000000000000' required: - kind - typedData - nonce - deadline required: - available - authorization - type: object properties: available: type: boolean enum: - false reason: type: string enum: - permit2-approval-required - unsupported-token - unsupported-owner approval: type: object properties: token: type: string pattern: ^0x[a-fA-F0-9]{40}$ description: Ethereum address (0x followed by 40 hex characters) example: '0x742d35Cc6634C0532925a3b844Bc9e7595f5bE91' spender: type: string pattern: ^0x[a-fA-F0-9]{40}$ description: Ethereum address (0x followed by 40 hex characters) example: '0x742d35Cc6634C0532925a3b844Bc9e7595f5bE91' minimumAmount: type: string pattern: ^\d+$ description: Numeric string representing a bigint value example: '1000000000000000000' required: - token - spender - minimumAmount required: - available - reason ErrorResponse: type: object properties: error: type: string details: type: array items: type: object properties: message: type: string path: type: array items: anyOf: - type: string - type: number code: type: string required: - message required: - error PermitTypedData: type: object properties: domain: {} types: {} primaryType: type: string message: {} required: - primaryType ````