Multi-chain EVM RPC (read-only)

Read-only JSON-RPC against Ethereum, Base, Polygon, Arbitrum, or Optimism with built-in multi-endpoint failover — one paid call, no node or API key of your own. Whitelisted methods only: eth_blockNumber, eth_gasPrice, eth_getBalance, eth_getTransactionCount, eth_getBlockByNumber, eth_getTransactionByHash, eth_getTransactionReceipt, eth_call, eth_getCode, eth_getStorageAt, eth_chainId, eth_feeHistory, net_version. Mutating, signing, subscription, and unbounded methods (eth_getLogs) are rejected. Results over 200KB serialized return 413 — narrow the query.

Input

Example output

{
  "network": "base",
  "method": "eth_blockNumber",
  "result": "0x1a2b3c4"
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/evm-rpc \
  -H "Content-Type: application/json" \
  -d '{"network":"base","method":"eth_blockNumber","params":[]}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/evm-rpc", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "network": "base",
    "method": "eth_blockNumber",
    "params": []
  }),
});

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