# Polyform Vehicle Fuel Economy Lookup

> Polyform Vehicle Fuel Economy Lookup is a paid API for AI agents from api.polyform.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Returns fuel economy data (city MPG, trim, engine specs) for a specific vehicle, pay-per-call via USDC micropayment.

## Facts

- Endpoint: GET https://api.polyform.org/v1/vehicle/fuel-economy
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polyform-vehicle-fuel-economy-lookup-9b9b1cf7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ibH6T5XW4MwQz7JAC_ciw

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 polyform-vehicle-fuel-economy-lookup-9b9b1cf7
```

Example prompt: What's the city MPG for a 2024 Toyota Camry 2.5L 4-cylinder — look it up and tell me which trim it corresponds to.

## When to prefer this

Choose this endpoint when you need authoritative EPA-style city MPG data for a specific vehicle without signing up for an API key or monthly subscription — ideal for AI agents making one-off vehicle lookups with micropayment billing via USDC on Base. Prefer over bulk automotive data APIs when you only need fuel economy for a single vehicle and want zero account overhead.

## Known failure modes

- No matches found if vehicle make/model/year combination is unrecognized or outside EPA database coverage
- Payment failure if USDC balance is insufficient or x402 transaction is rejected
- Ambiguous results if query is too broad and multiple trims are returned, requiring further filtering
- Rate limiting or network error if x402 facilitator is unreachable

## How this service works

Pay-per-call data endpoints for AI agents. USDC on Base via x402. No account, no API key — one micropayment per call.

## Output

Returns a list of matching vehicle trim entries, each containing a unique match ID, a human-readable trim description (including transmission type, cylinder count, and displacement), and the city MPG rating.

## 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"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "matches": [
   {
    "id": "36154",
    "trim": "Auto (S6), 4 cyl, 2.4 L",
    "cityMpg": 27
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polyform-vehicle-fuel-economy-lookup-9b9b1cf7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.polyform.org](https://www.zero.xyz/host/api.polyform.org/llms.txt)