# M2M Sentinel – Base Address Capability Score Lookup

> M2M Sentinel – Base Address Capability Score Lookup is a paid API for AI agents from api.m2msentinel.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns a static bytecode-derived capability score (capabilityScore) for a given Base mainnet contract address, covering coverage index rather than any safety or risk rating

## Facts

- Endpoint: GET https://api.m2msentinel.com/v1/security/score/:address
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/m2m-sentinel-base-address-capability-score-lookup-6e5db948
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ddz4FO0XAEzl4o37EUpIz

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 m2m-sentinel-base-address-capability-score-lookup-6e5db948
```

Example prompt: What's the M2M Sentinel capability score for the Base contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48?

## When to prefer this

Choose this endpoint when you need a quick, static, bytecode-level capability coverage index for a specific Base mainnet contract address — particularly useful for agent pipelines doing pre-interaction due diligence or filtering. Not suitable when you need a real-time safety score, risk rating, token pricing, gas fees, or transfer event data; those are covered by sibling M2M Sentinel endpoints.

## Known failure modes

- Invalid address format (not matching ^0x[0-9a-fA-F]{40}$) returns an error or 400
- Address not indexed on Base mainnet returns capabilityScore: null
- Network or upstream outage returns 5xx
- Insufficient payment or missing x402 payment header returns 402

## How this service works

How completely could this Base contract be checked, and on what grade of evidence. Separates checked-and-clean from could-not-be-checked, which automated callers otherwise conflate. Explicitly not a safety score.

## Output

A JSON object containing the contract address echoed back, a status field ('SUCCESS'), and a capabilityScore that is either a numeric value representing the static bytecode-derived capability coverage index or null if no score is available for that address.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "description": "A Base mainnet contract address."
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "status"
     ],
     "properties": {
      "status": {
       "type": "string",
       "const": "SUCCESS"
      },
      "address": {
       "type": "string"
      },
      "capabilityScore": {
       "type": [
        "number",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/m2m-sentinel-base-address-capability-score-lookup-6e5db948/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.m2msentinel.com](https://www.zero.xyz/host/api.m2msentinel.com/llms.txt)