Merlin Chain RPC Endpoint

Flat-rate Merlin Chain RPC provider and Merlin Chain RPC node access: free tier, no KYC, HTTP. Merlin Chain mainnet chain ID 4200.

Merlin Chain is a Bitcoin layer 2 from Bitmap Tech that runs an EVM-compatible zkEVM execution layer and uses BTC as its gas token. It focuses on Bitcoin-native assets such as BRC-20, Ordinals, Runes and Bitmap.

About Merlin Chain

Bitmap Tech announced Merlin Chain in January 2024 and the mainnet went live on February 8, 2024. It was built with Lumoz using the Polygon CDK and currently operates as a validium-style chain with a data availability committee, combining a ZK-rollup network, a decentralized oracle network and on-chain BTC fraud-proof modules.

Developers can deploy Solidity contracts and use Ethereum JSON-RPC, with fees paid in bridged BTC (Merlin BTC). The ecosystem centers on Bitcoin inscription and token protocols bridged from L1.

Common Use Cases on Merlin Chain

• Trading and lending BRC-20 and Runes assets
• Ordinals and Bitmap marketplaces
• BTC-gas DeFi apps
• Bridging Bitcoin-native assets to EVM

Merlin Chain Mainnet RPC URL (HTTP)

Merlin Chain WebSocket RPC URL

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

Quick Start: Connect to Merlin Chain

cURL

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

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

viem

import { createPublicClient, http } from "viem";

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

const blockNumber = await client.getBlockNumber();

web3.py

from web3 import Web3

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

Add Merlin Chain to MetaMask

Features of SwiftNodes for Merlin Chain

• 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 Merlin Chain

Rate Limits

Frequently Asked Questions: Merlin Chain

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