The Stack B3 Builders Ship On

Quicknode is a leading B3 RPC provider, serving mainnet and Sepolia testnet over low-latency JSON-RPC from 17+ global regions with a 99.99% uptime SLA. You get private JSON-RPC and WSS endpoints, the debug_* and OP-Node namespaces, and real-time Streams and Webhooks, on a platform that handles 500B+ requests a month across 80+ chains.

B3 is an EVM-compatible layer 3 built on the OP Stack and settling to Base, purpose-built for onchain gaming with low fees and high throughput. It uses ETH for gas. Mainnet runs on chain ID 8333.

Create a free Quicknode account, select B3, and a private RPC URL is generated instantly. You get full method coverage and rate limits that scale with your plan. No credit card is required for the free tier.

A B3 node is a server that validates blocks and answers JSON-RPC requests for the B3 network. Running your own means managing sync, storage, and OP Stack upgrades. With Quicknode you connect to a managed B3 endpoint with HTTPS and WSS, real-time Streams and Webhooks, and a 99.99% uptime SLA, with no infrastructure to maintain.

Quicknode supports the full B3 Ethereum JSON-RPC over HTTPS and WSS, including eth_call, eth_getLogs, eth_sendRawTransaction, et eth_subscribe, plus the debug_* namespace and the OP-Node API (optimism, optimism_outputAtBlock) for rollup sync status and output roots. Real-time Streams and Webhooks complete the data stack.

B3 is an OP Stack rollup that retains recent state, about 128 blocks, rather than a full historical archive. Quicknode serves B3 blocks and transactions over JSON-RPC and delivers full historical block and event data through Streams, so you can index everything you need into your own store.

Yes. B3 is EVM compatible. Deploy existing Solidity contracts with Hardhat, Foundry, or Remix without modification, and use ethers.js, web3.js, viem, and @quicknode/sdk against your Quicknode endpoint exactly as you would on Ethereum.

Quicknode serves B3 mainnet (chain ID 8333) over HTTPS and WSS, with recent-state history and real-time Streams and Webhooks. The B3 Sepolia testnet (chain ID 1993) is also available.

Quicknode serves B3 from 17+ global regions behind a 99.99% uptime SLA, with automatic failover and low-latency routing. The same infrastructure handles 500B+ requests a month across 80+ chains, so your B3 games and apps stay responsive under load.

Quicknode offers a free tier for B3 with no credit card required, so you can get a mainnet or Sepolia testnet endpoint in seconds. Paid plans scale with request volume and add higher rate limits, and enterprise plans add dedicated infrastructure and a 99.99% uptime SLA.

B3 mainnet uses chain ID 8333 and ETH as the native gas token. The B3 Sepolia testnet uses chain ID 1993. To add mainnet to a wallet, use your Quicknode RPC URL, chain ID 8333, the currency symbol ETH, and the explorer at explorer.b3.fun.

Use Quicknode Streams for backfill and real-time blocks, logs, and traces delivered to your datastore, and Webhooks for push notifications on addresses and events. For in-app subscriptions, connect over WSS and use eth_subscribe.

B3 is built for onchain gaming: game economies and item marketplaces, low-fee microtransactions, player identity, and consumer apps that need high throughput on a Base-settled L3.