# FRED Series Metadata Lookup

> FRED Series Metadata Lookup is a paid API for AI agents from agent402.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-16).

Returns descriptive metadata for a FRED economic data series — title, frequency, units, seasonal adjustment, date range, and popularity score.

## Facts

- Endpoint: GET https://agent402.tools/api/fred-series-info
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fred-series-metadata-lookup-d99761c2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kJDpx0vFRzY8NCTQA563h

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 fred-series-metadata-lookup-d99761c2
```

Example prompt: Before I pull the actual data, can you check the metadata for FRED series UNRATE — specifically its frequency, units, seasonal adjustment, and the date range it covers?

## When to prefer this

Use this endpoint before calling /api/fred-series to confirm a series exists, understand its frequency and units, and verify it covers the time range you need. Prefer this over directly fetching series data when you are unsure whether a given series ID is valid or appropriate for your analysis.

## Known failure modes

- Invalid or unknown seriesId returns an error — FRED series IDs are case-sensitive (e.g. 'unrate' may fail where 'UNRATE' succeeds)
- Network timeout or upstream FRED API unavailability causes a 5xx response
- Missing required seriesId query parameter returns a 400-level validation error
- Discontinued or renamed series may return limited metadata with no recent observation dates

## How this service works

Metadata for a FRED series: title, frequency, units, seasonal adjustment, observation date range, and popularity. Use before /api/fred-series to confirm the series fits your needs. ?seriesId=UNRATE This product uses the FRED(R) API but is not endorsed or certified by the Federal Reserve Bank of St. Louis.

## Output

Returns a JSON object containing the series title, observation frequency (e.g. monthly, quarterly), units of measurement, seasonal adjustment status, earliest and latest observation dates, and a popularity score — everything needed to confirm the series is appropriate before fetching its data.

## 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",
     "required": [
      "seriesId"
     ],
     "properties": {
      "seriesId": {
       "type": "string",
       "description": "FRED series ID, e.g. UNRATE"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "id",
      "title",
      "frequency",
      "units",
      "observationStart",
      "observationEnd",
      "popularity"
     ],
     "properties": {
      "id": {
       "type": "string"
      },
      "title": {
       "type": "string"
      },
      "units": {
       "type": "string"
      },
      "frequency": {
       "type": "string"
      },
      "popularity": {
       "type": "integer"
      },
      "observationEnd": {
       "type": "string"
      },
      "observationStart": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "UNRATE",
  "title": "Unemployment Rate",
  "units": "Percent",
  "frequency": "Monthly",
  "popularity": 94,
  "observationEnd": "2026-05-01",
  "observationStart": "1948-01-01"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fred-series-metadata-lookup-d99761c2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402.tools](https://www.zero.xyz/host/agent402.tools/llms.txt)