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. Prefer the named reads (block-number, chain-info, block-info, event-logs, erc721-owner, contract-code) for common tasks - they validate inputs and cost less; use this when you need a whitelisted method they do not wrap. 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.

TRY IN PLAYGROUND →

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": []
  }),
});

Part of these workflows

This tool is one step in a curated multi-tool workflow - agents can fetch the whole sequence as an MCP prompt or call https://agent402.tools/api/skill-packs/{slug}/prompt.

• Transaction forensics - Explain what an EVM transaction actually did: confirmation status, the raw transaction from the chain, decoded calldata with typed parameters, the resolved function signature, and labeled counterparties.

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