# Fathom Macroeconomic Data API — Vintage Dates

> Fathom Macroeconomic Data API — Vintage Dates is a paid API for AI agents from fathom-opal.vercel.app, paid per call via x402, $0.06/call, status unknown (last checked 2026-09-14).

Returns the list of vintage dates (data release timestamps) for a given FRED economic time series, showing when historical data was revised or published

## Facts

- Endpoint: POST https://fathom-opal.vercel.app/api/vintage
- Price: $0.06/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fathom-macroeconomic-data-api-vintage-dates-b15fb225
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nFgQRQLmq6cW4OTninM8K

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 fathom-macroeconomic-data-api-vintage-dates-b15fb225 -d '<json body>'
```

Example prompt: Can you pull the vintage dates for the FRED series GDPC1 — I want to see up to 20 entries showing when that GDP data was published or revised over time.

## When to prefer this

Choose this endpoint when you specifically need to know WHEN a FRED economic time series was published or revised — i.e., its vintage dates — rather than the actual data values. Ideal for macroeconomic research requiring data revision history, real-time data analysis, or understanding how estimates were updated over time. Prefer this over general FRED wrappers if you need a pay-per-call, no-subscription model with USDC micropayments via x402.

## Known failure modes

- Invalid or unknown FRED series ID returns an error or empty result
- Limit parameter ignored or causing unexpected truncation if malformed
- Network timeout from the Vercel serverless deployment under cold-start conditions
- FRED upstream API outage causing data unavailability
- Payment failure via x402 protocol blocking the request

## How this service works

Free macroeconomic data API powered by FRED. 816,000+ economic time series. GDP, inflation, unemployment, interest rates, and more.

## Output

Returns a JSON object containing the data source label, the FRED series ID, and an array of vintage date objects — each representing a date when the time series data was released, revised, or updated by the original data provider.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "seriesId"
 ],
 "properties": {
  "limit": {
   "type": "string",
   "description": "Max results (default: 10)"
  },
  "seriesId": {
   "type": "string",
   "description": "FRED series ID"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "source"
 ],
 "properties": {
  "source": {
   "type": "string"
  },
  "series_id": {
   "type": "string"
  },
  "vintage_dates": {
   "type": "array",
   "items": {
    "type": "object"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fathom-macroeconomic-data-api-vintage-dates-b15fb225/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fathom-opal.vercel.app](https://www.zero.xyz/host/fathom-opal.vercel.app/llms.txt)