Syscoin RPC Endpoint

Fast, flat-rate Syscoin RPC node provider — free tier, no KYC, HTTP & WebSocket.

Syscoin is a Bitcoin-secured network running a dual architecture: a UTXO main chain merged-mined with Bitcoin via AuxPoW, plus NEVM, an EVM-compatible virtual machine for smart contracts. SYS is the native gas token.

About Syscoin

Syscoin's distinguishing design is that Bitcoin miners can secure it without extra work: AuxPoW lets a miner embed a Syscoin tag in a Bitcoin block, so Syscoin inherits Bitcoin hash power and fork-awareness instead of running its own validator set. On top of that UTXO base layer, NEVM provides EVM smart contracts, and the project positions the combination as a Bitcoin layer 2 with a data-availability role for rollups.

Contract developers see a normal EVM surface on chain ID 57 with SYS paying fees. The architecture is worth understanding if you are moving assets: the UTXO side and the EVM side are separate execution environments inside one network, so asset transfers between them are not the same operation as an EVM-to-EVM call.

Common Use Cases on Syscoin

• Bitcoin-secured smart contracts
• Asset issuance
• Payments merged-mined with Bitcoin
• Rollup data availability

HTTP Endpoint

WebSocket Endpoint

Quick Start: Connect to Syscoin

cURL

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

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

viem

import { createPublicClient, http } from "viem";

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

const blockNumber = await client.getBlockNumber();

web3.py

from web3 import Web3

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

Add Syscoin to MetaMask

Features of SwiftNodes for Syscoin

• Multiple load-balanced upstream nodes for high availability
• Health-checked every 60 seconds 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 Syscoin

Rate Limits