Cronos zkEVM RPC Endpoint

Flat-rate Cronos zkEVM RPC provider and Cronos zkEVM RPC node access: free tier, no KYC, HTTP. Cronos zkEVM mainnet chain ID 388.

Cronos zkEVM is a ZK rollup on Ethereum built with the ZK Stack, with zkCRO as its gas token. Access Cronos zkEVM RPC endpoints with SwiftNodes.

Cronos zkEVM Mainnet RPC URL (HTTP)

Cronos zkEVM WebSocket RPC URL

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

Quick Start: Connect to Cronos zkEVM

cURL

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

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

viem

import { createPublicClient, http } from "viem";

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

const blockNumber = await client.getBlockNumber();

web3.py

from web3 import Web3

w3 = Web3(Web3.HTTPProvider("https://rpc.swiftnodes.io/rpc/cronos-zkevm?key=YOUR_API_KEY"))
print("Cronos zkEVM block:", w3.eth.block_number)

Add Cronos zkEVM to MetaMask

Features of SwiftNodes for Cronos zkEVM

• 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 Cronos zkEVM

Rate Limits

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