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Starting January 2026, the CDP Node API will require developers to have a payment method on file. See Pricing for more details.

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Overview

To read blockchain data (like balances or transactions) or write to it (like deploying contracts), you need a connection to a blockchain node. Node provides blockchain access for developers building on Base, giving you instant RPC access without running your own infrastructure. Think of it as a direct line to the Base blockchain. You make requests, and Node handles all the complexity of connecting to and querying the network.

Try it now: Quickstart

Get your RPC endpoint and make your first blockchain request in minutes

Core EVM Methods

Standard Ethereum JSON-RPC methods

Paymaster Methods

Sponsor gas fees for users

Wallet History

Query wallet transactions and balances

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Key features

  • Production-ready RPC access: Instant connection to Base Mainnet and Sepolia testnet with reliable infrastructure and fast response times
  • Generous free tier: Get started with 10 million billing units free every month (enough for most development and testing needs)
  • Zero infrastructure management: Skip the complexity of running your own blockchain node and just use our endpoints
  • Standard Ethereum compatibility: Works seamlessly with any Ethereum-compatible tools and libraries like ethers.js and viem
  • Beyond basic RPC: Includes Paymaster for gas sponsorship and wallet history methods (ready to use immediately)

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Use cases

  • Build DeFi apps: Create trading interfaces, lending platforms, or dashboards that display live blockchain data
  • Create NFT platforms: Build marketplaces that show who owns which NFTs and track their transfer history
  • Develop wallet apps: Display user balances, show transaction history, and send transactions on behalf of users
  • Deploy smart contracts: Upload your contracts to Base and interact with them programmatically

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Supported networks

Currently available on:
  • Base Mainnet - Production environment for live applications
  • Base Sepolia - Testnet for development and testing
Base is a secure, low-cost, builder-friendly Ethereum L2 built to bring the next billion users onchain. Learn more about Base.

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Getting started

Ready to connect to Base? Our quickstart guide walks you through everything step-by-step—from trying Node in the browser playground to making your first programmatic request with code examples in multiple languages.

Start building: Quickstart

Get your RPC endpoint and make your first blockchain request in minutes

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Pricing & Rate Limits

CDP Node operates on a pay-as-you-go model with a generous free tier:
  • 10 million Billing Units (BU) free every month
  • After the free tier: $0.50 per million additional BUs
  • Rate limit: 7,500 BU every 5 seconds per project (approximately 50 requests per second)
Each JSON-RPC method consumes a specific number of BUs based on computational complexity. The average call uses 30 BU. Need higher limits? Join our Node Discord channel to request a rate limit increase. For detailed pricing by method, see our Pricing page.

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API Reference

When you’re ready to build, explore the available methods:

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Support and feedback

  • CDP Discord: Join #node for support and to request rate limit increases