# SCRIPTMASTERLABS MEV Pulse

> SCRIPTMASTERLABS MEV Pulse is a paid API for AI agents from mcp-x402.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-31).

Returns real-time MEV (Maximal Extractable Value) pulse data from a relay, paid via x402 USDC on Base

## Facts

- Endpoint: GET https://mcp-x402.onrender.com/x402/mev-pulse?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/scriptmasterlabs-mev-pulse-11794324
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FZark9vxaOS0rsKJpC2PM

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 scriptmasterlabs-mev-pulse-11794324
```

Example prompt: Pull the latest MEV pulse from the default relay — limit the results to 10 entries — and show me what's happening with transaction ordering right now.

## When to prefer this

Use this endpoint when you need real-time MEV relay pulse data and are willing to pay $0.02 USDC per call via x402 on Base mainnet. Prefer this over free alternatives when you need fresh, low-latency relay data with no API key registration. Best suited for DeFi agents, MEV bots, or block-builder monitoring workflows that require on-demand relay snapshots.

## Known failure modes

- 402 Payment Required if x402 payment not attached and no valid X-Api-Market-Key or X-API-Key provided
- relay_url not reachable or returns no data — empty or error JSON response
- limit parameter out of range — may return default number of results or error
- relay data unavailable during low-activity periods — sparse or null payload
- network timeout if the relay URL is slow to respond
- invalid relay_url format — likely a 4xx or descriptive error JSON

## How this service works

SCRIPTMASTERLABS x402 Gateway. Discover paid APIs and inspect fresh x402 v2 payment requirements before calling them. Current hosted authority is USDC on Base mainnet (eip155:8453); caller controls spending policy. MARKETPLACE REVIEW: use free /x402/playground/* (no key, no payment). Production /x402/* returns 402 unless paid via x402 or X-Api-Market-Key / X-API-Key from seller dashboard.

## Output

A JSON object containing a snapshot of current MEV relay activity, including transaction ordering data, relay pulse metrics, and possibly block builder statistics. The response schema is open-ended (example: {}) suggesting the output structure varies by relay and activity.

## 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": {
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "limit": {
       "type": "integer"
      },
      "relay_url": {
       "type": "string"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type",
    "example"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/scriptmasterlabs-mev-pulse-11794324/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-x402.onrender.com](https://www.zero.xyz/host/mcp-x402.onrender.com/llms.txt)