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Base RPC URL & Endpoint for Mainnet

An Ethereum Layer 2 built on the OP Stack for low-cost, high-throughput dApps, wallets, and onchain users.

Connect to Base Mainnet with https://base.api.onfinality.io/public and chain ID 8453. Use the public HTTPS RPC for connection checks, then create an authenticated OnFinality endpoint for your wallet, consumer app or DeFi backend. For testing with test ETH, use Base Sepolia and chain ID 84532.

Chain ID8453

CurrencyETH

Create a free API key for 400,000 response units per day and up to 40 response units/second. Method weights apply.

Public endpoint rate limit: 5 req/sec

Quick Start

Mainnet Sepolia

curl -H 'Content-Type: application/json' -d '{"id":1,"jsonrpc":"2.0","method":"eth_blockNumber"}' 'https://base.api.onfinality.io/public'

curl -H 'Content-Type: application/json' -d '{"id":1,"jsonrpc":"2.0","method":"eth_blockNumber"}' 'https://base.api.onfinality.io/public'

HTTPs

https://base.api.onfinality.io/public

https://base.api.onfinality.io/public

Create an RPC endpoint for Base

GET CONNECTED

Connect to Base

Use OnFinality Base RPC with HTTPS examples and chain ID 8453. Compare public endpoints with authenticated APIs, archive queries and plans for production apps.

Try the public interface

First request

curl 'https://base.api.onfinality.io/public' \
  -H 'Content-Type: application/json' \
  --data '{"id":1,"jsonrpc":"2.0","method":"eth_blockNumber"}'

Use the interface and request shown above for an initial check, then test the methods and traffic pattern your application actually needs.

Create your own access

Open the dashboard and select this network.
Create an endpoint and copy the access details supplied by the dashboard.
Validate your application's methods, peak traffic and error handling before production.

Create an RPC endpoint for Base

RPC API

RPC API plans & response units

Choose a shared RPC plan by response-unit allowance and peak throughput. Method weights and network-specific availability still apply.

Developer

Free

Included response units: 400,000/day
Rate limit: Up to 40 RU/s
Extra RU: Not available

Growth

$49/month

Included response units: 20 million/month
Rate limit: 200 RU/s
Extra RU: $6/million

Accelerate

$249/month

Included response units: 100 million/month
Rate limit: 500 RU/s
Extra RU: $3.75/million

Compare RPC plans

Plan figures checked 8 November 2026. RU are not always raw requests; WebSocket responses also count toward limits. Check the current pricing and this network's method documentation. Node charges and applicable taxes are additional.

NETWORK REFERENCE

Base RPC Service Details

Network: Base Mainnet
Chain ID: 8453
Native token: ETH
Protocol: EVM / OP Stack
Archive access: Supported
Trace / Debug: Supported
Regions: Not specified
Base Sepolia: Supported
Service status: 99.9% · Check details
Independent benchmark: CompareNodes

NETWORK REFERENCE

Base Public RPC vs OnFinality Base RPC

	Base Public RPC	OnFinality Base RPC
API key	No	Yes
Production workloads	Limited	Yes
Rate limits	Public limits	Up to plan limits
Usage analytics	No	Yes
Archive access	Limited / method dependent	Yes
Trace / Debug	Limited	Yes
Dedicated capacity	No	Yes
Base Sepolia	Yes	Yes

Base's official public RPC is useful for testing and lightweight development. For production applications that need higher request limits, archive data, trace/debug access, analytics, or dedicated infrastructure, developers can use a managed Base RPC provider such as OnFinality.

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