openapi: 3.0.3
info:
  title: Etherscan 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: Accounts
    description: Address balances, transactions, and token holdings
  - name: Contracts
    description: Smart contract source, ABI, and verification
  - name: Transactions
    description: Transaction status and receipts
  - name: Blocks
    description: Block details, rewards, and uncles
  - name: Tokens
    description: ERC-20, ERC-721, and ERC-1155 token data
  - name: Gas Tracker
    description: Network gas oracle and gas price estimates
  - name: Stats
    description: Network and supply statistics
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:
        - Accounts
        - Contracts
        - Transactions
        - Blocks
        - Tokens
        - Gas Tracker
        - Stats
      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:
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: query
      name: apikey
      description: Etherscan API key, obtained from https://etherscan.io/myapikey
  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).