Base

Base is Coinbase's Ethereum Layer 2 network built on the OP Stack and part of the Optimism Superchain. It exposes a standard Ethereum JSON-RPC interface for smart contracts and dApps, plus higher-level developer surfaces including Base Account (Smart Wallet, Sub Accounts, passkeys, paymaster-sponsored transactions), OnchainKit React components, Mini Apps, the canonical Bridge to Ethereum, and a Solana cross- chain bridge. Block exploration is available through BaseScan and Blockscout.

9 APIs 0 Features

Layer 2EthereumOP StackSuperchainJSON-RPCSmart WalletBridge

APIs

Base Mainnet JSON-RPC

Standard Ethereum JSON-RPC endpoint for Base Mainnet (chain ID 8453). Supports eth_*, net_*, web3_*, and Optimism-specific extensions for fee estimation and L1 messaging. The pu...

Base Sepolia JSON-RPC

Public JSON-RPC endpoint for the Base Sepolia testnet (chain ID 84532) used for development, contract deployment, and integration testing.

Base Flashblocks RPC

Pre-confirmation JSON-RPC endpoint exposing Flashblocks — sub-block streams of ordered transactions that allow apps to react to pending state with sub-second latency.

Base Bridge

Canonical cross-chain bridge between Ethereum L1 and Base L2 for depositing and withdrawing ETH and ERC-20 tokens, secured by the OP Stack bridge contracts.

Base / Solana Bridge

Cross-chain bridge enabling asset transfers between Base and Solana, integrated into the Base ecosystem app surface.

Base Account / Smart Wallet

Base Account (formerly Coinbase Smart Wallet) is an ERC-4337 smart contract wallet with passkey sign-in, sub-accounts, session keys, sponsored transactions via paymaster, and SD...

OnchainKit

React component library and TypeScript SDK (@coinbase/onchainkit) for building onchain apps on Base — wallet, identity, transaction, swap, checkout, fund, and NFT components wit...

BaseScan Block Explorer

Etherscan-family block explorer for Base Mainnet and Sepolia with a public contract / transaction / address API.

Base Blockscout Block Explorer

Blockscout-powered open-source block explorer for Base with REST and GraphQL APIs.

Collections

Base JSON-RPC API

OPEN

GraphQL

Base GraphQL API

GRAPHQL

Pricing Plans

Base L2 Plans Pricing

1 plans

PLANS

Rate Limits

Base L2 Rate Limits

2 limits

RATE LIMITS

FinOps

Base L2 Finops

FINOPS

Resources

GitHubOrganization

Sources

opencollection: 1.0.0
info:
  name: Base JSON-RPC API
  version: 1.0.0
items:
- info:
    name: JSON-RPC
    type: folder
  items:
  - info:
      name: JSON-RPC 2.0 request
      type: http
    http:
      method: POST
      url: https://mainnet.base.org/
      body:
        type: json
        data: '{}'
    docs: Single endpoint that accepts any JSON-RPC 2.0 request. Supports the standard Ethereum namespaces (`eth_*`, `net_*`,
      `web3_*`) plus Optimism-specific extensions for fee estimation and L1 messaging. Batched requests (JSON arrays of request
      objects) are also supported.
bundled: true