# EPA Air Quality & Emissions Federal Register Changes Feed

> EPA Air Quality & Emissions Federal Register Changes 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 scored Federal Register final and proposed rules for air quality and emissions since a given timestamp, with compliance impact scores, effective dates, and primary-source links.

## Facts

- Endpoint: GET https://oracles-production.up.railway.app/v1/reg-epa-air/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/epa-air-quality-emissions-federal-register-changes-feed-6251f1ea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QfFT7xTyeU0FvpgtBQCp9

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 epa-air-quality-emissions-federal-register-changes-feed-6251f1ea
```

Example prompt: Pull all Federal Register air quality and emissions rule changes since 2025-01-01T00:00:00Z that are scored at least 6 for compliance impact, and show me up to 50 results with their effective dates and source links.

## When to prefer this

Use this endpoint when you need machine-readable, scored, and time-bounded lists of EPA air quality and emissions rulemakings from the Federal Register — especially for compliance monitoring workflows, automated alerts, or feeding a downstream digest. Prefer this over the LLM digest sibling when you need structured data with individual significance scores and source URLs rather than a narrative summary.

## Known failure modes

- Invalid or missing `since` parameter returns a 400 error
- `min_significance` outside 1–10 range returns a validation error
- `limit` exceeding 500 returns a 400 error
- Payment not included or insufficient returns a 402 Payment Required
- No matching rules in the requested window returns count 0 with empty changes array
- Federal Register source temporarily unavailable may return stale or empty results

## How this service works

Federal Register final & proposed rules affecting air quality & emissions (Environmental Protection Agency) since a timestamp — covering air quality, emission, clean air, ozone, particulate — 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 including a title, type (final or proposed rule), plain-language summary, significance score (1–10), effective date, primary Federal Register source URL, detection timestamp, and a unique entityId for further 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/epa-air-quality-emissions-federal-register-changes-feed-6251f1ea/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)