BOB RPC Endpoint

Flat-rate BOB RPC provider and BOB RPC node access: free tier, no KYC, HTTP. BOB mainnet chain ID 60808.

BOB (Build on Bitcoin) is an Ethereum layer 2 built on the OP Stack that targets Bitcoin DeFi, with ETH as its gas token. Its product focus is the BOB Gateway, which moves BTC and stablecoins into and out of BOB and other chains.

About BOB

BOB launched its mainnet in May 2024 as an optimistic rollup on the OP Stack. In July 2025 it moved to the Kailua hybrid fault-proof system that uses ZK proofs, but in September 2026 it withdrew from Kailua after derivation bugs and returned to a permissioned dispute game, according to L2BEAT. Its published roadmap includes a BitVM-based bridge for native BTC.

For RPC users BOB behaves like other OP Stack chains: standard Ethereum JSON-RPC, Solidity contracts and EVM tooling work unchanged. Sequencing is handled by a single centralized sequencer, and L1 finality follows the OP Stack model of batches posted to Ethereum.

Common Use Cases on BOB

• BTC-denominated DeFi lending and swaps
• Bridging BTC and stablecoins via BOB Gateway
• Porting existing OP Stack/EVM contracts
• Bitcoin yield vaults

BOB Mainnet RPC URL (HTTP)

BOB WebSocket RPC URL

Not available for BOB right now: none of its upstreams currently accepts a subscription in our health checks. Poll the HTTP endpoint above instead.

Quick Start: Connect to BOB

cURL

curl -X POST https://rpc.swiftnodes.io/rpc/bob?key=YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

ethers.js

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider(
  "https://rpc.swiftnodes.io/rpc/bob?key=YOUR_API_KEY"
);

const blockNumber = await provider.getBlockNumber();
console.log("BOB block:", blockNumber);

viem

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://rpc.swiftnodes.io/rpc/bob?key=YOUR_API_KEY"),
});

const blockNumber = await client.getBlockNumber();

web3.py

from web3 import Web3

w3 = Web3(Web3.HTTPProvider("https://rpc.swiftnodes.io/rpc/bob?key=YOUR_API_KEY"))
print("BOB block:", w3.eth.block_number)

Add BOB to MetaMask

Features of SwiftNodes for BOB

• Load-balanced across multiple upstream nodes wherever a chain has more than one, with automatic failover
• Health-checked every 2 minutes with automatic failover
• Free tier available — no credit card or KYC required
• Flat-rate monthly pricing with no per-request fees
• HTTP support (WebSocket not available for this chain right now)
• One API key works across all 75+ supported chains, including BOB

Rate Limits

Frequently Asked Questions: BOB

BOB RPC methods

Measured weekly through this endpoint: what each method returns on BOB, its limits, and an example request.

• eth_blockNumbersupported
• eth_chainIdsupported
• eth_getBalancesupported
• eth_getBlockByNumbersupported
• eth_getTransactionByHashsupported
• eth_getTransactionReceiptsupported
• eth_callsupported
• eth_estimateGassupported
• eth_gasPricesupported
• eth_maxPriorityFeePerGassupported
• eth_sendRawTransactionsupported
• eth_getTransactionCountsupported
• eth_getCodesupported
• eth_subscribenot available
• eth_getLogssupported
• eth_getBlockReceiptssupported
• eth_feeHistorysupported
• eth_getProofsupported
• eth_createAccessListsupported
• debug_traceCallsupported
• trace_blocksupported
• trace_transactionnot available

BOB guides from the blog

• BOB RPC: A Developer's Guide (Chain ID 60808)BOB is an OP Stack rollup for Bitcoin assets that pays gas in ETH. Measured: 2 s blocks, a 252 wei base fee, a transfer costing ~$0.0007 (92% of it L1 data), safe and finalized moving together 29 to 55 minutes behind, a 2,000-block eth_getLogs cap, and no tracing at any public RPC we tested.

Related L2 & rollup chains

Explore RPC endpoints for other L2 & rollup networks on SwiftNodes: