Hemi RPC Endpoint

Flat-rate Hemi RPC provider and Hemi RPC node access: free tier, no KYC, HTTP & WebSocket. Hemi mainnet chain ID 43111.

Hemi is an OP Stack-based Ethereum layer 2 that adds Bitcoin awareness to the EVM through its Hemi Virtual Machine (hVM). It uses ETH for gas and anchors its state to Bitcoin with a Proof-of-Proof (PoP) protocol.

About Hemi

Hemi's public mainnet launched on March 12, 2025. The hVM embeds an indexed view of Bitcoin inside the EVM, and the Hemi Bitcoin Kit (hBK) gives contracts access to Bitcoin state. PoP miners publish Hemi state to Bitcoin, which Hemi calls superfinality, and Tunnels move assets between Bitcoin, Hemi and Ethereum.

Standard EVM tooling works, and Bitcoin data is read through hVM precompiles and the hBK contracts. Developers should note that L2BEAT lists the fraud proof system as still in development, and that on June 1, 2026 an hVM precompile call in a force-included transaction crashed the sequencer and halted block production until it was fixed.

Common Use Cases on Hemi

• BTC-backed DeFi and lending
• Contracts that read Bitcoin state
• Bridging assets between Bitcoin and Ethereum
• Bitcoin yield products

Hemi Mainnet RPC URL (HTTP)

Hemi WebSocket RPC URL

Quick Start: Connect to Hemi

cURL

curl -X POST https://rpc.swiftnodes.io/rpc/hemi?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/hemi?key=YOUR_API_KEY"
);

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

viem

import { createPublicClient, http } from "viem";

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

const blockNumber = await client.getBlockNumber();

web3.py

from web3 import Web3

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

Add Hemi to MetaMask

Features of SwiftNodes for Hemi

• 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 and WebSocket support
• One API key works across all 75+ supported chains, including Hemi

Rate Limits

Frequently Asked Questions: Hemi

Hemi RPC methods

Measured weekly through this endpoint: what each method returns on Hemi, 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_subscribesupported
• eth_getLogssupported
• eth_getBlockReceiptssupported
• eth_feeHistorysupported
• eth_getProofsupported
• eth_createAccessListsupported
• debug_traceCallsupported
• trace_blocknot available
• trace_transactionnot available

Hemi guides from the blog

• Hemi RPC: A Developer's Guide (Chain ID 43111)Hemi is an OP Stack chain whose EVM can read Bitcoin. Measured: 12 s blocks, a 252 wei base fee, a transfer costing ~0.00000018 ETH (88% of it L1 data), the hVM Bitcoin precompiles in practice, ~20 min to finalized, full archive and eth_getLogs limits.

Related L2 & rollup chains

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