MEV block payment lookup · MEV Block Payment

by MEV block payment lookup

POSTBaseSolanaArbitrumPolygonMonadAvalancheeip155:1329OptimismFraxtaleip155:42220stellar:pubnetalgorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=

$0.002

per call · USD Coin on Base

Look up the MEV-Boost payment for a specific slot or block number via the Flashbots relay. Returns the builder, proposer, value paid in ETH, gas usage, and tx count. Returns found=false if the block was built locally or via a different MEV-Boost relay (Flashbots is one of several).

Endpoint

POST https://agent402.tools/api/mev-block-payment

4

Calls / 30d

1

Unique payers / 30d

Aug 31

Last called

exact

Payment scheme

Call this service

TypeScript · @x402/fetch
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://agent402.tools/api/mev-block-payment", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "blockNumber": 22000000
  }),
});
const data = await res.json();
cURL
curl -X POST \
  "https://agent402.tools/api/mev-block-payment" \
  -H "Content-Type: application/json" \
  -d '{"blockNumber":22000000}' \
  -H "X-PAYMENT: <signed x402 payment>"

Example response

{
  "blockHash": "0xabc...",
  "blockNumber": 22000000,
  "builderPubkey": "0x9000...",
  "builderShort": "0x90000000…abcdef",
  "found": true,
  "gasLimit": 30000000,
  "gasUsed": 14987654,
  "numTx": 187,
  "proposerFeeRecipient": "0x1234...",
  "proposerPubkey": "0xa000...",
  "relay": "flashbots",
  "slot": 12345678,
  "valueEth": 0.072345,
  "valueWei": "72345000000000000"
}

Payment details

Pay to0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0
AssetUSD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913
NetworksBase, Solana, Arbitrum, Polygon, Monad, Avalanche, eip155:1329, Optimism, Fraxtal, eip155:42220, stellar:pubnet, algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=
Schemesexact, upto

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