Cronos (CRO)

GetBlock provides fast and reliable access to Cronos nodes via JSON-RPC API. Connect to the Cronos network without running your own infrastructure.

Cronos is an EVM-compatible Layer 1 blockchain built by Crypto.com on the Cosmos SDK with Ethermint, secured by CometBFT (Tendermint) BFT consensus for fast, deterministic finality. It runs a standard Ethereum execution layer, so Solidity contracts, the eth_* JSON-RPC surface, and tooling such as Foundry, Hardhat, Ethers.js, and Viem work unchanged, while IBC connectivity links it to the wider Cosmos ecosystem. The native gas token is CRO, and Cronos supports EIP-1559 fee-market pricing through Ethermint's feemarket module. This reference document describes the Ethereum-compatible eth_* surface of Cronos EVM (chain ID 25), which is distinct from Cronos zkEVM (chain ID 388).

Key Features

• EVM Compatibility: Standard Ethereum contracts, JSON-RPC, and tooling run unchanged on the Ethermint execution layer

• Cosmos SDK Foundation: Built on the Cosmos SDK with IBC connectivity to the broader Cosmos ecosystem

• CometBFT Consensus: Tendermint BFT gives fast, deterministic single-block finality with no probabilistic reorgs

• EIP-1559 Fees: Ethermint's feemarket module provides base-fee pricing; eth_feeHistory and priority fees apply

• CRO Gas Token: Native gas is paid in CRO (18 decimals), with low, sub-cent transaction costs

• Ethereum Tooling: Compatible with MetaMask, Foundry, Hardhat, Remix, Ethers.js, and Viem

TECHNICAL DISCLAIMER: AUTHORITATIVE JSON-RPC API SPECIFICATION.

GetBlock's RPC API reference documentation is provided exclusively for informational purposes and to optimize the developer experience. Cronos implements the standard Ethereum JSON-RPC interface via Ethermint; the canonical specification for these methods is the Ethereum JSON-RPC specification at ethereum.org, and Cronos-specific behaviour is documented at docs.cronos.org.

Network Information

Property	Value
Network Name	Cronos EVM
Chain ID	25
Native Currency	CRO
EVM Compatible	Yes (Ethermint)
Framework	Cosmos SDK + Ethermint
Consensus	CometBFT (Tendermint) BFT
Block Time	~5-6 seconds
Finality	Deterministic (single block)
Fee Model	EIP-1559 (feemarket)

Base URL

Frankfurt, Germany

https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/

Available Interfaces

Cronos is a Cosmos SDK chain with an embedded Ethermint EVM, so a Cronos node exposes several API interfaces beyond the Ethereum one. GetBlock serves all of the following for Cronos; each is provisioned as its own endpoint, so choose the API interface when you create the endpoint in the GetBlock dashboard.

Interface	Protocol	Use it for
EVM JSON-RPC (HTTP)	Ethereum JSON-RPC 2.0 over HTTP	Contract calls, transactions, and reads — the surface this reference documents
EVM JSON-RPC (WS)	Ethereum JSON-RPC 2.0 over WebSocket	eth_subscribe streams (newHeads, logs) and live EVM data
Cosmos (REST)	RESTful gRPC-gateway (LCD) over HTTP	Cosmos SDK module queries — bank, staking, governance, IBC — by bech32 (crc1…) address
Cosmos (gRPC)	Protobuf gRPC services	Typed Cosmos SDK queries for production backends
Tendermint RPC (HTTP)	CometBFT JSON-RPC over HTTP	Consensus, block, and transaction data; transaction broadcast; abci_query for module state
Tendermint RPC (WS)	CometBFT JSON-RPC over WebSocket	Event subscriptions (new blocks, transactions) over WebSocket

The Cosmos REST and gRPC interfaces carry the same Cosmos SDK query set over different transports (REST is an HTTP/JSON gateway in front of gRPC). Tendermint RPC exposes the CometBFT consensus engine directly and is where transactions are broadcast and low-level block and abci_query data is read. All three use the bech32 crc1… address encoding; a Cronos account's 0x and crc1… addresses are two encodings of the same key.

Interface Endpoints

Cosmos REST

https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/

Tendermint RPC

https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/

Cosmos gRPC

shared.eu-central-1.getblock.io:443   (TLS, access token passed as request metadata)

Replace <ACCESS-TOKEN> with the access token from the GetBlock dashboard. Each interface is provisioned as its own endpoint — select the API interface when you create the endpoint. Cosmos REST and Tendermint RPC are HTTP; gRPC connects to a host:port target over TLS. Confirm the exact gRPC target and access token mechanism (metadata header vs. path) in the dashboard.

Supported Networks

Network	Chain ID	EVM JSON-RPC (HTTP)	EVM JSON-RPC (WS)	Cosmos (REST)	Cosmos (gRPC)	Tendermint RPC (HTTP)	Tendermint RPC (WSS)	Frankfurt, Germany
Mainnet	25	✅	✅	✅	✅	✅	✅	✅

APIs

• Cosmos REST API — Cosmos SDK module queries over HTTP/JSON

• Cosmos gRPC — the same query set over Protocol Buffers

• Tendermint RPC API — CometBFT consensus, block, tx, and abci_query

• EVM JSON-RPC API — the Ethereum-compatible eth_* surface (documented separately)

Quickstart

Javascript(Axios)

1

Setup project

mkdir cronos-api-quickstart && cd cronos-api-quickstart && npm init --yes

2

Install dependency

npm install axios

3

Add code

index.js

const axios = require('axios');

const url = 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/';

const payload = {
  jsonrpc: '2.0',
  method: 'eth_blockNumber',
  params: [],
  id: 'getblock.io'
};

axios.post(url, payload, {
  headers: { 'Content-Type': 'application/json' }
})
.then(response => {
  console.log('Latest block:', parseInt(response.data.result, 16));
})
.catch(error => console.error(error));

4

Run the script

node index.js

Python(Request)

1

Setup project

mkdir cronos-api-quickstart && cd cronos-api-quickstart
python -m venv venv && source venv/bin/activate

2

Install dependency

pip install requests

3

Add code

main.py

import requests
import json

url = "https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "eth_blockNumber",
    "params": [],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

4

Run the script

python main.py

Support

For technical support and questions:

• Support: [e-mail]

See Also

• Cronos Documentation

• Ethereum JSON-RPC Specification

• Cronos EVM Explorer

• Cronos Bridge

• Cronos Website