openapi: 3.1.0
info:
  title: Ankr RPC Service (Node API)
  description: |
    Ankr's RPC Service (Node API) provides HTTPS and WebSocket JSON-RPC endpoints for
    80+ blockchain networks (EVM and non-EVM). The public endpoint is open;
    Premium and Enterprise plans use an API-key-scoped endpoint with x50 the rate
    limit of the public Node API. This specification documents the common
    EVM JSON-RPC envelope that ships behind every `https://rpc.ankr.com/{chain}` URL;
    non-EVM chains (Solana, Aptos, Stellar, etc.) expose their native JSON-RPC or REST
    surface at the same per-chain endpoint.
  version: "1.0.0"
  contact:
    name: Ankr
    url: https://www.ankr.com
    email: support@ankr.com
  license:
    name: Ankr Terms of Service
    url: https://www.ankr.com/terms/
servers:
  - url: https://rpc.ankr.com/{chain}
    description: Public Plan RPC endpoint
    variables:
      chain:
        default: eth
        enum:
          - eth
          - bsc
          - polygon
          - arbitrum
          - optimism
          - base
          - avalanche
          - fantom
          - gnosis
          - linea
          - scroll
          - taiko
          - solana
          - aptos
          - stellar
          - tron
        description: Chain identifier in the URL path.
  - url: https://rpc.ankr.com/{chain}/{API_KEY}
    description: Premium Plan RPC endpoint
    variables:
      chain:
        default: eth
      API_KEY:
        default: API_KEY
tags:
  - name: EVM
    description: Standard Ethereum JSON-RPC envelope shared by every EVM chain.
paths:
  /:
    post:
      summary: Ankr Execute JSON-RPC Call
      description: |
        Execute a JSON-RPC 2.0 call against the selected chain. The `method` field
        carries the EVM method name (`eth_blockNumber`, `eth_getBalance`,
        `eth_chainId`, `eth_call`, `eth_getLogs`, `eth_getTransactionByHash`,
        `eth_getTransactionReceipt`, `eth_sendRawTransaction`, etc.).
      operationId: callRpc
      tags:
        - EVM
      requestBody:
        required: true
        content:
          application/json:
            schema:
              oneOf:
                - $ref: '#/components/schemas/JsonRpcRequest'
                - type: array
                  items:
                    $ref: '#/components/schemas/JsonRpcRequest'
      responses:
        '200':
          description: JSON-RPC response (single or batched).
          content:
            application/json:
              schema:
                oneOf:
                  - $ref: '#/components/schemas/JsonRpcResponse'
                  - type: array
                    items:
                      $ref: '#/components/schemas/JsonRpcResponse'
        '429':
          description: Rate limit exceeded. Premium API keys raise the limit x50.
        '4XX':
          $ref: '#/components/responses/ErrorResponse'
components:
  schemas:
    JsonRpcRequest:
      type: object
      required:
        - jsonrpc
        - method
        - id
      properties:
        jsonrpc:
          type: string
          default: "2.0"
        id:
          oneOf:
            - type: integer
            - type: string
        method:
          type: string
          example: eth_blockNumber
        params:
          type: array
          items: {}
    JsonRpcResponse:
      type: object
      properties:
        jsonrpc:
          type: string
        id:
          oneOf:
            - type: integer
            - type: string
        result: {}
        error:
          $ref: '#/components/schemas/JsonRpcError'
    JsonRpcError:
      type: object
      properties:
        code:
          type: integer
        message:
          type: string
        data: {}
  responses:
    ErrorResponse:
      description: JSON-RPC error envelope.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/JsonRpcResponse'