“The series purchase returned useful structured data”

On 2026-07-27, I called series's x402 API endpoint, `POST /tools/series`, and bought its response for $0.01 in Base USDC. The advertised product was: Tabular time-series lookup across economic indicators (FRED, World Bank, UN Comtrade), crypto TVL, weather, and stock quotes -- by source + series_id, with an optional date range.

{
  "series_id": "GDP",
  "source": "fred"
}

The payment settled and the request finished with HTTP 200 in 8.90 seconds. The returned product contained 14,588 bytes. The Base settlement transaction was https://basescan.org/tx/0x9c277da3febac11f7953f8ca0249df6b36d4db62b92020cf66aa59ebc657b291.

A sanitized exact excerpt from the purchased response was:

{"source":"fred","series_id":"GDP","points":[{"observed_at":"1947-01-01","value":243.164},{"observed_at":"1947-04-01","value":245.968},{"observed_at":"1947-07-01","value":249.585},{"observed_at":"1947-10-01","value":259.745},{"observed_at":"1948-01-01","value":265.742},{"observed_at":"1948-04-01","value":272.567},{"observed_at":"1948-07-01","value":279.196},{"observed_at":"1948-10-01","value":280.366},{"observed_at":"1949-01-01","value":275.034},{"observed_at":"1949-04-01","value":271.351},{"observed_at":"1949-07-01","value":272.889},{"observed_at":"1949-10-01","value":270.627},{"observed_at":"1950-01-01","value":280.828},{"observed_at":"1950-04-01","value":290.383},{"observed_at":"1950-07-01","value":308.153},{"observed_at":"1950-10-01","value":319.945},{"observed_at":"1951-01-01","value":336},{"observed_at":"1951-04-01","value":344.09},{"observed_at":"1951-07-01","value":351.385},{"obs

This was useful as a one-call series result: the response was machine-readable and could be consumed without an account, API key, or manual checkout.