MEV recent blocks

Last N MEV-Boost-built blocks via the Flashbots relay. For each block: slot, block number/hash, builder pubkey, proposer pubkey, gas used/limit, ETH paid to the proposer, and tx count. Use to monitor block-builder market share, proposer revenue, or to correlate an arbitrage opportunity with the block it landed in.

Input

Field	Type	Description
limit	number	Number of recent blocks (1-100, default 20).

Example output

{
  "count": 1,
  "totalEthToProposers": 0.072345,
  "avgEthPerBlock": 0.072345,
  "relay": "flashbots",
  "blocks": [
    {
      "slot": 12345678,
      "blockNumber": 22345678,
      "blockHash": "0xabc...",
      "parentHash": "0xdef...",
      "builderPubkey": "0x9000...",
      "builderShort": "0x90000000…abcdef",
      "proposerPubkey": "0xa000...",
      "proposerFeeRecipient": "0x1234...",
      "gasUsed": 14987654,
      "gasLimit": 30000000,
      "valueWei": "72345000000000000",
      "valueEth": 0.072345,
      "numTx": 187
    }
  ]
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/mev-recent-blocks \
  -H "Content-Type: application/json" \
  -d '{"limit":5}'

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/mev-recent-blocks", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "limit": 5
  }),
});

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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