Avalanche Fuji RPC Endpoint

Chain ID 43113. The testnet for Avalanche's C-Chain, the EVM chain behind Avalanche mainnet.

Online right now, checked every 2 minutes. WebSocket: available.

Endpoints

https://rpc.swiftnodes.io/rpc/avalanche-fuji?key=YOUR_API_KEY
wss://rpc.swiftnodes.io/ws/avalanche-fuji?key=YOUR_API_KEY

The same API key works here and on Avalanche mainnet, and testnet requests count toward your plan like any other request. The free plan includes testnets. Going to mainnet means changing avalanche-fuji to avalanche in the URL.

import { createPublicClient, http } from "viem";
import { avalancheFuji } from "viem/chains";

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

console.log(await client.getBlockNumber());

About Avalanche Fuji

Fuji is Avalanche's testnet. Our Fuji endpoint serves its C-Chain, the EVM chain where contracts and most Avalanche apps run, with the same JSON-RPC interface as C-Chain mainnet.

Avalanche finalizes blocks as they are accepted, so there is no reorg window to wait out: a block returned as latest is final.

What we measured

Measured through our endpoint on October 18, 2026.

Chain ID	43113 (0xa869)
Block interval	2.42 s average over 200 blocks
Block gas limit	32,000,000
eth_gasPrice	160 wei
finalized	the head block

Frequently asked questions

What is the Avalanche Fuji chain ID?

43113, or 0xa869 in hex. Avalanche C-Chain mainnet is 43114.

Is the Fuji endpoint the C-Chain?

Yes. /rpc/avalanche-fuji serves Fuji's C-Chain over standard Ethereum JSON-RPC.

Is the Avalanche Fuji RPC endpoint free?

Yes. The free plan covers Fuji at 20 requests per second and 250,000 requests a month, on the same key as Avalanche mainnet.

Other testnets

Get a free Avalanche Fuji endpoint

One key for every testnet and mainnet we serve. No credit card, no KYC.

Get your API key