Free BOB RPC Endpoint

BOB — Build on Bitcoin — is the hybrid OP-Stack L2 that brings Bitcoin DeFi to Ethereum tooling. NodeFlare serves BOB from two regions (Asia and US-East) with automatic failover — coverage most providers don't offer for this chain.

BOB RPC URLs#

Public endpoint — no API key:

https://rpc.nodeflare.app/bob/public

Keyed endpoint (free account — higher limits, heavy methods):

https://rpc.nodeflare.app/bob/v1/{YOUR_KEY}

Get your free key → — no credit card.

Quick start#

curl https://rpc.nodeflare.app/bob/public \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider(
  'https://rpc.nodeflare.app/bob/public'
);
console.log('BOB block:', await provider.getBlockNumber());

BOB at a glance#

Despite the branding, BOB is an Ethereum L2: gas is ETH and all EVM tooling works unchanged. The ecosystem revolves around BTC-backed assets (wBTC, tBTC) and Bitcoin-finality tooling. Per-method notes live in the BOB method reference.

Free tier#

• 2,000,000 compute units/month — no credit card
• eth_getLogs (75 CU), trace_*/debug_* (100 CU) included on free
• Every supported chain under one key
• Geo-routed between our Singapore and New York BOB nodes

Add BOB to MetaMask#

FAQ#

What is the BOB RPC URL? https://rpc.nodeflare.app/bob/public — free, no API key, geo-routed to the nearest region.

Is BOB a Bitcoin sidechain? No — it's an Ethereum L2 (OP-Stack) with Bitcoin-focused DeFi. Gas is ETH; BTC lives on BOB as wrapped/bridged representations.

Does eth_getLogs work on BOB? Yes, with a free key (75 CU per call). BOB launched in 2024, so wide log ranges are still practical.

Building Bitcoin DeFi on BOB? Get your free NodeFlare key → — one key for every chain we serve.