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OpenAPI Specification

openapi: 3.2.0
info:
  title: Alchemy Token Token Balances API
  description: The Alchemy Token API provides comprehensive access to ERC-20 token data across EVM-compatible networks. Developers can retrieve token balances by wallet address, token metadata (name, symbol, decimals, logo), and real-time pricing data. The API supports multi-chain queries and returns standardized responses for easy integration into wallets, portfolio trackers, and DeFi applications.
  version: '1.0'
  contact:
    name: Alchemy Support
    url: https://www.alchemy.com/support
  x-generated-from: documentation
servers:
- url: https://eth-mainnet.g.alchemy.com/v2/{apiKey}
  description: Ethereum Mainnet
  variables:
    apiKey:
      default: your-api-key
      description: Your Alchemy API key.
- url: https://polygon-mainnet.g.alchemy.com/v2/{apiKey}
  description: Polygon Mainnet
  variables:
    apiKey:
      default: your-api-key
      description: Your Alchemy API key.
tags:
- name: Token Balances
  description: Retrieve ERC-20 token balances for wallet addresses.
paths:
  /getTokenBalances:
    post:
      operationId: getTokenBalances
      summary: Alchemy Get Token Balances
      description: Returns ERC-20 token balances for a specified wallet address across all tokens or a specified list of token contract addresses. Supports both paginated full-portfolio queries and targeted balance lookups.
      tags:
      - Token Balances
      security:
      - apiKeyHeader: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/JsonRpcRequest'
            examples:
              GetTokenBalancesRequestExample:
                summary: Default getTokenBalances request
                x-microcks-default: true
                value:
                  id: 1
                  jsonrpc: '2.0'
                  method: alchemy_getTokenBalances
                  params:
                  - address: '0x2791bca1f2de4661ed88a30c99a7a9449aa84174'
                    tokenType: erc20
      responses:
        '200':
          description: Token balances retrieved successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TokenBalancesResponse'
              examples:
                GetTokenBalances200Example:
                  summary: Default getTokenBalances 200 response
                  x-microcks-default: true
                  value:
                    id: 1
                    jsonrpc: '2.0'
                    result:
                      address: '0x2791bca1f2de4661ed88a30c99a7a9449aa84174'
                      tokenBalances:
                      - contractAddress: '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48'
                        tokenBalance: '0x0000000000000000000000000000000000000000000000000de0b6b3a7640000'
                        error: null
                      pageKey: null
        '400':
          description: Bad request - invalid parameters.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/JsonRpcErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  schemas:
    TokenBalance:
      type: object
      title: Token Balance
      description: ERC-20 token balance entry for a wallet address.
      properties:
        contractAddress:
          type: string
          description: Token contract address.
          example: '0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48'
        tokenBalance:
          type: string
          description: Token balance in hexadecimal (raw units, divide by 10^decimals).
          example: '0x0000000000000000000000000000000000000000000000000de0b6b3a7640000'
        error:
          type:
          - string
          - 'null'
          description: Error message if the balance could not be retrieved.
          example: null
    JsonRpcErrorResponse:
      type: object
      title: JSON-RPC Error Response
      description: JSON-RPC error response envelope.
      properties:
        id:
          type: integer
          example: 1
        jsonrpc:
          type: string
          example: '2.0'
        error:
          $ref: '#/components/schemas/JsonRpcError'
    JsonRpcError:
      type: object
      title: JSON-RPC Error
      description: Error object for a failed JSON-RPC response.
      properties:
        code:
          type: integer
          description: JSON-RPC error code.
          example: -32602
        message:
          type: string
          description: Human-readable error description.
          example: Invalid params
    TokenBalancesResult:
      type: object
      title: Token Balances Result
      description: Result payload for token balance queries.
      properties:
        address:
          type: string
          description: Wallet address queried.
          example: '0x2791bca1f2de4661ed88a30c99a7a9449aa84174'
        tokenBalances:
          type: array
          items:
            $ref: '#/components/schemas/TokenBalance'
          description: List of token balances for the wallet.
        pageKey:
          type:
          - string
          - 'null'
          description: Pagination key for fetching the next page.
          example: null
    JsonRpcRequest:
      type: object
      title: JSON-RPC Request
      description: Standard JSON-RPC 2.0 request envelope for Alchemy API methods.
      required:
      - id
      - jsonrpc
      - method
      - params
      properties:
        id:
          type: integer
          description: Request identifier for response correlation.
          example: 1
        jsonrpc:
          type: string
          description: JSON-RPC protocol version.
          example: '2.0'
        method:
          type: string
          description: Alchemy or Ethereum JSON-RPC method name.
          example: alchemy_getTokenBalances
        params:
          type: array
          description: Method-specific parameters array.
          items: {}
    TokenBalancesResponse:
      type: object
      title: Token Balances Response
      description: JSON-RPC response containing token balance results.
      properties:
        id:
          type: integer
          example: 1
        jsonrpc:
          type: string
          example: '2.0'
        result:
          $ref: '#/components/schemas/TokenBalancesResult'
  securitySchemes:
    apiKeyHeader:
      type: apiKey
      in: header
      name: X-Alchemy-Token
      description: Alchemy API key. Also embedded in server URL path variable.