Developer Directory
Everything you need to build on Ethereum Classic — networks, RPC endpoints, execution clients, development tools, and contract frameworks. With the Olympia upgrade, the full Ethereum toolchain works on ETC without modification, making the ETC developer experience identical to Ethereum mainnet.
Networks
Ethereum Classic
mainnetMordor Testnet
testnetRPC Endpoints (7)
Full build guide →| Provider | URL | Network |
|---|---|---|
| Rivet | https://etc.rivet.link | mainnet |
| Blockscout | https://etc.blockscout.com/api/eth-rpc | mainnet |
| ETC Cooperative | https://www.ethercluster.com/etc | mainnet |
| GETH Classic | https://geth-de.etc-network.info | mainnet |
| ETC Cooperative | https://rpc.mordor.etccooperative.org | testnet |
| GETH Mordor | https://geth-mordor.etc-network.info | testnet |
| 0xRPC | https://0xrpc.io/mordor | testnet |
Node Clients (3)
Fukuii
Ethereum execution layer client in Scala 3 — native Proof-of-Work consensus for ETC mainnet and Mordor, Engine API for ETH mainnet and Sepolia. One binary, four networks. The primary ETC client for the Olympia era.
Core-Geth
Bridge release — sunset after Olympia. etclabscore/core-geth v1.12.x was unmaintained June 2024–March 2026 (21 months), accumulating six unpatched CVEs that were actively exploited against ETC mainnet bootnodes. All CVEs patched by White B0x at ethereumclassic/core-geth, pending release as v1.13.0. v1.13.x is the final series — migrate to Fukuii before Olympia activation.
Hyperledger Besu
Reference — Enterprise-grade Hyperledger client used for cross-client testing and validation. Ensures protocol correctness through independent implementation verification across all three Olympia clients.
Developer Tools (11)
Hardhat
Ethereum development environment for compiling, deploying, testing, and debugging smart contracts.
Visit →Foundry
Blazing fast, portable, and modular toolkit for Ethereum application development written in Rust.
Visit →Remix IDE
Browser-based IDE for Solidity development with built-in compiler, debugger, and deployment tools.
Visit →Truffle Suite
Development framework with built-in testing, debugging, and deployment pipeline.
Visit →web3.js
Collection of libraries for interacting with Ethereum nodes using HTTP, IPC, or WebSocket.
Visit →OpenZeppelin
Library of secure, audited smart contract templates including ERC-20, ERC-721, access control, and more.
Visit →Slither
Static analysis framework for Solidity, detecting vulnerabilities and code optimization opportunities.
Visit →Mythril
Security analysis tool for EVM bytecode. Detects security vulnerabilities in smart contracts.
Visit →