Alchemy Gas Manager API

openapi: 3.0.3
info:
  title: Alchemy Gas Manager API
  description: >-
    The Alchemy Gas Manager API enables developers to sponsor gas fees for
    end users via the ERC-4337 Account Abstraction standard. Using a Gas
    Manager policy, developers can define rules for which transactions to
    sponsor, covering ETH gas fees so users never need to hold native tokens
    to interact with dApps. Supports gasless transactions, ERC-20 gas
    payments, and policy-based sponsorship controls.
  version: '1.0'
  contact:
    name: Alchemy Support
    url: https://www.alchemy.com/support
  x-generated-from: documentation
servers:
  - url: https://manage.g.alchemy.com/api
    description: Alchemy Gas Manager Management API
  - url: https://eth-mainnet.g.alchemy.com/v2/{apiKey}
    description: Ethereum Mainnet RPC
    variables:
      apiKey:
        default: your-api-key
        description: Your Alchemy API key.
tags:
  - name: Policies
    description: Create and manage gas sponsorship policies.
  - name: Paymaster
    description: Sponsor user operations via ERC-4337 paymaster endpoints.
paths:
  /gasManager/policy:
    get:
      operationId: listPolicies
      summary: Alchemy Gas Manager List Policies
      description: >-
        Returns all gas manager sponsorship policies for the authenticated
        application. Policies define rules for which user operations to
        sponsor, including allowlists, spend limits, and expiry windows.
      tags:
        - Policies
      security:
        - bearerAuth: []
      responses:
        '200':
          description: Policies retrieved successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PolicyListResponse'
              examples:
                ListPolicies200Example:
                  summary: Default listPolicies 200 response
                  x-microcks-default: true
                  value:
                    policies:
                      - policyId: pol-abc123
                        name: Default Sponsorship Policy
                        status: active
                        network: eth-mainnet
                        maxSpendPerUser: 1.0
                        maxSpendTotal: 1000.0
        '401':
          description: Unauthorized - invalid API key.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
    post:
      operationId: createPolicy
      summary: Alchemy Gas Manager Create Policy
      description: >-
        Creates a new gas sponsorship policy defining rules for which user
        operations to sponsor. Policies support per-user spend limits, total
        spend caps, allowlisted contracts, and time-based expiry.
      tags:
        - Policies
      security:
        - bearerAuth: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreatePolicyRequest'
            examples:
              CreatePolicyRequestExample:
                summary: Default createPolicy request
                x-microcks-default: true
                value:
                  name: My Sponsorship Policy
                  network: eth-mainnet
                  maxSpendPerUser: 1.0
                  maxSpendTotal: 500.0
      responses:
        '201':
          description: Policy created successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Policy'
              examples:
                CreatePolicy201Example:
                  summary: Default createPolicy 201 response
                  x-microcks-default: true
                  value:
                    policyId: pol-xyz789
                    name: My Sponsorship Policy
                    status: active
                    network: eth-mainnet
                    maxSpendPerUser: 1.0
                    maxSpendTotal: 500.0
        '400':
          description: Bad request - invalid policy parameters.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /gasManager/policy/{policyId}:
    get:
      operationId: getPolicy
      summary: Alchemy Gas Manager Get Policy
      description: >-
        Retrieves details for a specific gas sponsorship policy by its
        unique identifier, including spend limits, network, and current status.
      tags:
        - Policies
      parameters:
        - name: policyId
          in: path
          required: true
          description: Unique identifier of the gas manager policy.
          schema:
            type: string
          example: pol-abc123
      security:
        - bearerAuth: []
      responses:
        '200':
          description: Policy retrieved successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Policy'
              examples:
                GetPolicy200Example:
                  summary: Default getPolicy 200 response
                  x-microcks-default: true
                  value:
                    policyId: pol-abc123
                    name: Default Sponsorship Policy
                    status: active
                    network: eth-mainnet
                    maxSpendPerUser: 1.0
                    maxSpendTotal: 1000.0
        '404':
          description: Policy not found.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
  /sponsorUserOperation:
    post:
      operationId: sponsorUserOperation
      summary: Alchemy Gas Manager Sponsor User Operation
      description: >-
        Submits a user operation for gas sponsorship via the ERC-4337 paymaster.
        Returns a signed paymaster response that the bundler uses to cover gas
        fees on behalf of the user, enabling gasless transactions.
      tags:
        - Paymaster
      security:
        - apiKeyHeader: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SponsorUserOperationRequest'
            examples:
              SponsorUserOperationRequestExample:
                summary: Default sponsorUserOperation request
                x-microcks-default: true
                value:
                  id: 1
                  jsonrpc: '2.0'
                  method: alchemy_requestGasAndPaymasterAndData
                  params:
                    - policyId: pol-abc123
                      entryPoint: '0x5ff137d4b0fdcd49dca30c7cf57e578a026d2789'
                      userOperation:
                        sender: '0xd8da6bf26964af9d7eed9e03e53415d37aa96045'
                        nonce: '0x0'
                        initCode: '0x'
                        callData: '0x'
      responses:
        '200':
          description: User operation sponsored successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SponsorUserOperationResponse'
              examples:
                SponsorUserOperation200Example:
                  summary: Default sponsorUserOperation 200 response
                  x-microcks-default: true
                  value:
                    id: 1
                    jsonrpc: '2.0'
                    result:
                      paymasterAndData: '0xabc123paymaster'
                      preVerificationGas: '0x5208'
                      verificationGasLimit: '0x15f90'
                      callGasLimit: '0x9c40'
        '400':
          description: Bad request - operation rejected by policy.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Bearer token for Gas Manager Management API authentication.
    apiKeyHeader:
      type: apiKey
      in: header
      name: X-Alchemy-Token
      description: Alchemy API key for RPC endpoint authentication.
  schemas:
    Policy:
      type: object
      title: Gas Manager Policy
      description: A gas sponsorship policy defining rules for covering user operation gas fees.
      properties:
        policyId:
          type: string
          description: Unique identifier for the policy.
          example: pol-abc123
        name:
          type: string
          description: Display name for the policy.
          example: Default Sponsorship Policy
        status:
          type: string
          enum:
            - active
            - inactive
            - expired
          description: Current status of the policy.
          example: active
        network:
          type: string
          description: Blockchain network the policy applies to.
          example: eth-mainnet
        maxSpendPerUser:
          type: number
          format: double
          description: Maximum ETH spend per user address covered by this policy.
          example: 1.0
        maxSpendTotal:
          type: number
          format: double
          description: Maximum total ETH spend across all users for this policy.
          example: 1000.0
    PolicyListResponse:
      type: object
      title: Policy List Response
      description: List of gas manager policies.
      properties:
        policies:
          type: array
          items:
            $ref: '#/components/schemas/Policy'
          description: Array of policy objects.
    CreatePolicyRequest:
      type: object
      title: Create Policy Request
      description: Request body for creating a new gas manager policy.
      required:
        - name
        - network
      properties:
        name:
          type: string
          description: Display name for the new policy.
          example: My Sponsorship Policy
        network:
          type: string
          description: Blockchain network for the policy.
          example: eth-mainnet
        maxSpendPerUser:
          type: number
          format: double
          description: Maximum ETH spend per user (optional).
          example: 1.0
        maxSpendTotal:
          type: number
          format: double
          description: Maximum total ETH spend across all users (optional).
          example: 500.0
    SponsorUserOperationRequest:
      type: object
      title: Sponsor User Operation Request
      description: JSON-RPC request to sponsor a user operation via the Gas Manager paymaster.
      properties:
        id:
          type: integer
          description: Request ID.
          example: 1
        jsonrpc:
          type: string
          description: JSON-RPC version.
          example: '2.0'
        method:
          type: string
          description: Alchemy paymaster method.
          example: alchemy_requestGasAndPaymasterAndData
        params:
          type: array
          description: Sponsorship parameters array.
          items: {}
    SponsorUserOperationResult:
      type: object
      title: Sponsor User Operation Result
      description: Paymaster response data for a sponsored user operation.
      properties:
        paymasterAndData:
          type: string
          description: Encoded paymaster address and data for the user operation.
          example: '0xabc123paymaster'
        preVerificationGas:
          type: string
          description: Pre-verification gas estimate in hexadecimal.
          example: '0x5208'
        verificationGasLimit:
          type: string
          description: Verification gas limit in hexadecimal.
          example: '0x15f90'
        callGasLimit:
          type: string
          description: Call gas limit in hexadecimal.
          example: '0x9c40'
    SponsorUserOperationResponse:
      type: object
      title: Sponsor User Operation Response
      description: JSON-RPC response for sponsored user operation requests.
      properties:
        id:
          type: integer
          example: 1
        jsonrpc:
          type: string
          example: '2.0'
        result:
          $ref: '#/components/schemas/SponsorUserOperationResult'
    ErrorResponse:
      type: object
      title: Error Response
      description: Standard error response.
      properties:
        error:
          type: string
          description: Error code.
          example: UNAUTHORIZED
        message:
          type: string
          description: Human-readable error message.
          example: Invalid API key.
        statusCode:
          type: integer
          description: HTTP status code.
          example: 401