Core RPC Endpoint

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

Core is a Bitcoin-aligned EVM Layer 1 secured by Satoshi Plus, a consensus model combining delegated Bitcoin hash power with delegated proof-of-stake. It positions itself as a settlement and DeFi layer for Bitcoin holders while remaining fully Ethereum-compatible for Solidity contracts.

About Core

Core mainnet launched on January 14, 2023. Its Satoshi Plus consensus lets Bitcoin miners delegate hash power and CORE holders delegate stake to validators, blending proof-of-work security with delegated proof-of-stake. Blocks are produced on the order of a few seconds, and the chain supports standard EVM tooling such as Hardhat, Foundry, ethers.js, and MetaMask.

The network centers on Bitcoin utility, including non-custodial Bitcoin staking and yield products built around CORE and BTC. CORE is the native gas and staking token with a fixed maximum supply of 2.1 billion. Developers deploy Solidity contracts unchanged, and assets bridge in from Bitcoin and other chains to be used in Core's DeFi ecosystem.

Common Use Cases on Core

• Bitcoin staking and BTC yield
• EVM DeFi (lending, DEXes, stablecoins)
• Wrapped BTC and cross-chain assets
• NFT minting and marketplaces
• Smart contract deployment in Solidity

Core Ecosystem

Hosts Bitcoin-focused DeFi and infrastructure including Colend, Glyph, and BTC staking protocols, plus standard EVM DEXes and lending markets.

HTTP Endpoint

WebSocket Endpoint

Quick Start: Connect to Core

cURL

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

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

viem

import { createPublicClient, http } from "viem";

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

const blockNumber = await client.getBlockNumber();

web3.py

from web3 import Web3

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

Add Core to MetaMask

Bridging to Core

Assets bridge via providers such as LayerZero (Stargate) and Core's supported bridges; BTC enters through Core's non-custodial Bitcoin staking and wrapped-BTC integrations.

Features of SwiftNodes for Core

• 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 Core

Rate Limits

Frequently Asked Questions: Core