openapi: 3.1.0
info:
  title: Arbitrum JSON-RPC API
  version: 1.0.0
  summary: Best-effort OpenAPI for the public Arbitrum JSON-RPC endpoints.
  description: 'Public JSON-RPC endpoints for the Arbitrum One, Arbitrum Nova, and Arbitrum

    Sepolia chains. The Arbitrum chains implement the standard Ethereum JSON-RPC

    interface (eth_*, net_*, web3_*) and add Arbitrum-specific precompiles and

    extended methods (arb_*, arbtrace_*, debug_*).


    All requests are POST with a JSON body following the JSON-RPC 2.0 envelope.

    Public RPC endpoints do not support WebSockets and IPv6 is not supported.

    Sequencer-only endpoints accept only eth_sendRawTransaction and

    eth_sendRawTransactionConditional.


    This spec is a best-effort generation from public docs. See

    https://docs.arbitrum.io/build-decentralized-apps/reference/node-providers

    for the source list.

    '
  contact:
    name: Offchain Labs / Arbitrum Foundation
    url: https://docs.arbitrum.io/
servers:
- url: https://arb1.arbitrum.io/rpc
  description: Arbitrum One mainnet (chain ID 42161)
- url: https://nova.arbitrum.io/rpc
  description: Arbitrum Nova mainnet (chain ID 42170)
- url: https://sepolia-rollup.arbitrum.io/rpc
  description: Arbitrum Sepolia testnet (chain ID 421614)
security: []
tags:
- name: JSON-RPC
  description: Ethereum-compatible JSON-RPC 2.0 endpoint
paths:
  /:
    post:
      tags:
      - JSON-RPC
      summary: Invoke a JSON-RPC method
      description: 'Single entry point for all JSON-RPC calls. The HTTP body is a JSON-RPC 2.0

        request object (or a batch array). Common Ethereum methods include

        eth_blockNumber, eth_chainId, eth_getBalance, eth_getTransactionByHash,

        eth_getTransactionReceipt, eth_call, eth_estimateGas,

        eth_sendRawTransaction, eth_getLogs. Arbitrum-specific methods include

        arb_getL1Confirmations and various nodeinterface precompile calls.

        '
      operationId: jsonRpcCall
      requestBody:
        required: true
        content:
          application/json:
            schema:
              oneOf:
              - $ref: '#/components/schemas/JsonRpcRequest'
              - type: array
                items:
                  $ref: '#/components/schemas/JsonRpcRequest'
            examples:
              blockNumber:
                summary: eth_blockNumber
                value:
                  jsonrpc: '2.0'
                  id: 1
                  method: eth_blockNumber
                  params: []
              chainId:
                summary: eth_chainId
                value:
                  jsonrpc: '2.0'
                  id: 1
                  method: eth_chainId
                  params: []
              getBalance:
                summary: eth_getBalance
                value:
                  jsonrpc: '2.0'
                  id: 1
                  method: eth_getBalance
                  params:
                  - '0x0000000000000000000000000000000000000000'
                  - latest
      responses:
        '200':
          description: JSON-RPC response (or batch)
          content:
            application/json:
              schema:
                oneOf:
                - $ref: '#/components/schemas/JsonRpcResponse'
                - type: array
                  items:
                    $ref: '#/components/schemas/JsonRpcResponse'
        '400':
          description: Malformed JSON-RPC request
        '429':
          description: Rate limited by the public RPC endpoint
        '500':
          description: Internal RPC error
components:
  schemas:
    JsonRpcResponse:
      type: object
      required:
      - jsonrpc
      properties:
        jsonrpc:
          type: string
          const: '2.0'
        id:
          oneOf:
          - type: integer
          - type: string
          - type: 'null'
        result: {}
        error:
          $ref: '#/components/schemas/JsonRpcError'
    JsonRpcError:
      type: object
      required:
      - code
      - message
      properties:
        code:
          type: integer
        message:
          type: string
        data: {}
    JsonRpcRequest:
      type: object
      required:
      - jsonrpc
      - method
      properties:
        jsonrpc:
          type: string
          const: '2.0'
        id:
          oneOf:
          - type: integer
          - type: string
          - type: 'null'
        method:
          type: string
          examples:
          - eth_blockNumber
          - eth_chainId
          - eth_getBalance
          - eth_call
          - eth_sendRawTransaction
        params:
          type: array
          items: {}