# MEV Block Analytics

> MEV Block Analytics is a paid API for AI agents from api.chainmarket-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-25).

Fetches recent MEV-boosted Ethereum block data including builder activity, gas utilization, and proposer payments from Flashbots relay

## Facts

- Endpoint: GET https://api.chainmarket-api.workers.dev/api/crypto/mev-block-analytics?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mev-block-analytics-9bca0d30
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hWLZpRhosyMY7MF68lrVM

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability mev-block-analytics-9bca0d30
```

Example prompt: Show me the last 20 MEV-boosted Ethereum blocks from the Flashbots relay — I want to see builder activity, gas utilization, and how much ETH proposers are earning.

## When to prefer this

Use this endpoint when you need real-time MEV block analytics sourced directly from the Flashbots boost relay, including builder competition data, proposer payments, and gas utilization. Prefer this over generic block explorers when you specifically need MEV-relay-delivered block data with builder attribution and payment breakdown, without requiring an API key or account setup.

## Known failure modes

- Flashbots relay unavailable or returns empty data — response may show zero blocks or error
- Invalid limit parameter (out of range 1-50) may return an error or default to 10
- Network timeout to Flashbots relay causes delayed or failed response
- Payment failure — call not charged if x402 payment does not go through

## How this service works

Ethereum MEV-Boost delivered blocks from the Flashbots relay: proposer payment in ETH (block value), transaction count, gas used vs limit, and builder pubkeys with block counts. Covers the newest blocks only (1 to 50). Sandwich volume is not in this source and is not reported.

## Output

Returns a JSON object containing an array of recent MEV-boosted Ethereum blocks (each with slot, block number, builder pubkey, transaction count, gas used/limit, gas utilization %, and proposer payment in ETH), a list of top builders by block count, aggregate stats (average and total proposer payment in ETH, total block count), the Flashbots relay source URL, and a timestamp of when data was checked.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "limit": {
       "type": "string",
       "description": "How many of the newest delivered blocks, 1 to 50 (default 10)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "blocks": [
   {
    "slot": 15493647,
    "numTx": 427,
    "gasUsed": 56657250,
    "gasLimit": 60000000,
    "blockNumber": 26254436,
    "builderPubkey": "0x88510a78794b69e07f73b2f3ee309f78fc372dcb2ed85d5f80bbe7ebc579778f2a7d6aafbb8b00c00cb7241e1c800d65",
    "gasUtilizationPct": 94.43,
    "proposerPaymentEth": 0.008564297047065914
   },
   {
    "slot": 15493560,
    "numTx": 215,
    "gasUsed": 21940433,
    "gasLimit": 60000000,
    "blockNumber": 26254350,
    "builderPubkey": "0x88510a78794b69e07f73b2f3ee309f78fc372dcb2ed85d5f80bbe7ebc579778f2a7d6aafbb8b00c00cb7241e1c800d65",
    "gasUtilizationPct": 36.57,
    "proposerPaymentEth": 0.01024089989571211
   }
  ],
  "source": "https://boost-relay.flashbots.net/relay/v1/data/bidtraces/proposer_payload_delivered",
  "checkedAt": "2026-10-23T09:35:55.434Z",
  "blockCount": 10,
  "topBuilders": [
   {
    "blocks": 7,
    "builderPubkey": "0x88510a78794b69e07f73b2f3ee309f78fc372dcb2ed85d5f80bbe7ebc579778f2a7d6aafbb8b00c00cb7241e1c800d65"
   },
   {
    "blocks": 2,
    "builderPubkey": "0x850b00e055388c1b56f137e0852bc02d8b05534e9f96dd1d11cff8cf0481b800ecc2e708cdc158cd95b7cfdaa6840ee7"
   }
  ],
  "avgProposerPaymentEth": 0.006436,
  "totalProposerPaymentEth": 0.064364
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mev-block-analytics-9bca0d30/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.chainmarket-api.workers.dev](https://www.zero.xyz/host/api.chainmarket-api.workers.dev/llms.txt)