# Federal Register Motor Vehicle Safety Rules Feed

> Federal Register Motor Vehicle Safety Rules Feed is a paid API for AI agents from oracles-production.up.railway.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns Federal Register final and proposed rules for motor-vehicle safety standards since a given timestamp, each scored 1-10 for compliance impact, with effective dates and primary-source links.

## Facts

- Endpoint: GET https://oracles-production.up.railway.app/v1/reg-vehicles/changes
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/federal-register-motor-vehicle-safety-rules-feed-3837d85d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_km9thCiNPMAmHCMpYjdSQ

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 federal-register-motor-vehicle-safety-rules-feed-3837d85d
```

Example prompt: Pull all Federal Register motor vehicle safety rule changes since 2025-01-01T00:00:00Z that are scored at least 7 out of 10 for compliance impact, and show me their titles, effective dates, and source links.

## When to prefer this

Choose this endpoint when you need raw, machine-readable Federal Register regulatory change data specifically for motor vehicle safety standards, want to filter by recency and minimum compliance impact score, or need effective dates and source URLs for compliance verification workflows. Prefer this over the LLM digest sibling when you need structured data for downstream processing rather than a human-readable summary.

## Known failure modes

- Missing or malformed 'since' parameter returns validation error
- 'since' value in wrong format (not ISO-8601) causes 400 error
- min_significance outside 1–10 range causes 422 validation error
- limit outside 1–500 range causes 422 validation error
- No matching rules in the time window returns count:0 with empty changes array
- x402 payment not completed results in 402 Payment Required response
- Service unavailable returns 5xx with no data

## How this service works

Federal Register final & proposed rules affecting motor-vehicle safety standards (National Highway Traffic Safety Administration) since a timestamp — covering motor vehicle, fmvss, fuel economy, occupant, airbag — each scored 1-10 for compliance impact, with effective dates and primary-source links.

## Output

A JSON object containing a count of matching changes and an array of regulatory change records, each with: title, change type, plain-language summary, compliance significance score (1–10), effective date, ISO-8601 detection timestamp, primary Federal Register source URL, and an entity ID for further detail lookup.

## 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": {
      "limit": {
       "type": "integer",
       "maximum": 500,
       "minimum": 1
      },
      "since": {
       "type": "string",
       "format": "date-time",
       "description": "Only changes detected after this ISO-8601 instant"
      },
      "min_significance": {
       "type": "integer",
       "maximum": 10,
       "minimum": 1,
       "description": "Keep only changes scored at least this"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "count": {
       "type": "integer"
      },
      "source": {
       "type": "string"
      },
      "changes": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "type": {
          "type": "string"
         },
         "title": {
          "type": "string"
         },
         "detail": {
          "type": "object"
         },
         "summary": {
          "type": "string"
         },
         "entityId": {
          "type": "string"
         },
         "sourceUrl": {
          "type": [
           "string",
           "null"
          ],
          "description": "Primary-source link for verification"
         },
         "detectedAt": {
          "type": "string",
          "format": "date-time"
         },
         "significance": {
          "type": "integer",
          "maximum": 10,
          "minimum": 1
         },
         "effectiveDate": {
          "type": [
           "string",
           "null"
          ]
         }
        }
       }
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/federal-register-motor-vehicle-safety-rules-feed-3837d85d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from oracles-production.up.railway.app](https://www.zero.xyz/host/oracles-production.up.railway.app/llms.txt)