# M2M Sentinel Gas Fee Observer

> M2M Sentinel Gas Fee Observer is a paid API for AI agents from api.m2msentinel.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Returns the current Base network base gas fee with source provenance metadata

## Facts

- Endpoint: GET https://api.m2msentinel.com/v1/gas/fees
- Price: $0.005/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-gas-fee-observer-88d2b0ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5KbieC11hxACrU-tuPSm8

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-gas-fee-observer-88d2b0ed
```

Example prompt: What's the current base gas fee on the Base network right now? I need the live fee with source provenance so I can estimate transaction costs.

## When to prefer this

Use this endpoint when you need a real-time, provenance-tagged observation of the current Base network gas fee — particularly when you need to know not just the fee value but also the source of that observation for auditability or multi-source validation. Prefer this over generic RPC calls when operating in an agentic, pay-per-call context already using the x402 micropayment protocol on Base.

## Known failure modes

- Network unavailability may return a non-SUCCESS status
- Gas fee data may be momentarily stale during high network congestion
- Missing or malformed response if the upstream Base RPC source is unreachable
- Payment failure (402) if the $0.005 USDC micropayment is not processed correctly via x402 protocol

## How this service works

What a Base transaction costs right now, with the RPC provider and trust level behind the number, so a caller can tell a credentialed reading from a degraded one before pricing a transaction.

## Output

Returns a JSON object with a SUCCESS status, the Base network identifier, and a gasPrice object reflecting the current base gas fee, along with source provenance indicating where the observation originated.

## 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",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "status"
     ],
     "properties": {
      "status": {
       "type": "string",
       "const": "SUCCESS"
      },
      "network": {
       "type": "string"
      },
      "gasPrice": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/m2m-sentinel-gas-fee-observer-88d2b0ed/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)