Etherscan Contracts API

openapi: 3.0.3
info:
  title: Etherscan Accounts Contracts API
  description: Etherscan API V2 provides unified access to blockchain data across Ethereum and 60+ EVM-compatible chains, including transactions, addresses, blocks, smart contracts, token transfers, and gas tracking. A single API key works across all supported networks.
  version: '2.0'
  contact:
    name: Etherscan Support
    url: https://docs.etherscan.io/
  termsOfService: https://etherscan.io/apiterms
  license:
    name: Etherscan API Terms
    url: https://etherscan.io/apiterms
servers:
- url: https://api.etherscan.io/v2/api
  description: Etherscan unified V2 API endpoint
security:
- apiKeyAuth: []
tags:
- name: Contracts
  description: Smart contract source, ABI, and verification
paths:
  /:
    get:
      summary: Unified API endpoint
      description: All Etherscan API V2 calls are issued against the same endpoint, with the `module`, `action`, and `chainid` query parameters selecting the operation and target chain.
      operationId: callApi
      tags:
      - Contracts
      parameters:
      - name: chainid
        in: query
        required: true
        description: Numeric chain ID (e.g. 1 for Ethereum mainnet, 56 for BNB Smart Chain, 8453 for Base).
        schema:
          type: integer
          example: 1
      - name: module
        in: query
        required: true
        description: API module (account, contract, transaction, block, stats, gastracker, token).
        schema:
          type: string
          example: account
      - name: action
        in: query
        required: true
        description: Action within the module (e.g. balance, txlist, tokenbalance, getabi).
        schema:
          type: string
          example: balance
      - name: address
        in: query
        required: false
        description: Ethereum address for account or token operations.
        schema:
          type: string
          example: '0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae'
      - name: contractaddress
        in: query
        required: false
        description: Smart contract address for token or contract operations.
        schema:
          type: string
      - name: startblock
        in: query
        required: false
        schema:
          type: integer
      - name: endblock
        in: query
        required: false
        schema:
          type: integer
      - name: page
        in: query
        required: false
        schema:
          type: integer
      - name: offset
        in: query
        required: false
        schema:
          type: integer
      - name: sort
        in: query
        required: false
        schema:
          type: string
          enum:
          - asc
          - desc
      - name: tag
        in: query
        required: false
        description: Block tag (latest, earliest, pending) or block number.
        schema:
          type: string
      responses:
        '200':
          description: Successful response with module-specific result payload.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiResponse'
        '400':
          description: Invalid request parameters.
        '401':
          description: Missing or invalid API key.
        '429':
          description: Rate limit exceeded.
components:
  schemas:
    ApiResponse:
      type: object
      properties:
        status:
          type: string
          description: 1 for success, 0 for error
          example: '1'
        message:
          type: string
          example: OK
        result:
          description: Module-specific response payload (string, object, or array).
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: query
      name: apikey
      description: Etherscan API key, obtained from https://etherscan.io/myapikey