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BTS Open Data (Monthly Transportation Statistics)

U.S. Department of Transportation, Bureau of Transportation Statistics · The Monthly Transportation Statistics table updates roughly monthly, but each indicator column lands on its OWN source agency's schedule: the newest row is routinely near-empty and individual columns can lag weeks or months behind others in the same table. The seasonally adjusted series (the Transportation Services Index, ATA truck tonnage) are periodically revised when seasonal factors are re-estimated.

License: public-domain · official terms. Attribution text and per-series license flags ride in every API envelope.

Source API docs

Quickstart

Latest observations, with provenance and citation on every value:

curl "https://starwell.dev/api/starwell/v1/sources/bts-socrata/series/crem-w557:truck_tonnage_index/observations?latest=12"

A computed, cited answer from this source:

curl -X POST "https://starwell.dev/api/starwell/v1/answer" \
  -H "Authorization: Bearer dlk_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"question": "What is the latest Truck tonnage index?", "source": "bts-socrata"}'

Data reads need no key; answers do. Keys are free at /account; a keyless sample lives at GET /api/starwell/v1/answer/demo.

As MCP tools in Claude, Cursor, or any agent framework:

claude mcp add --transport http starwell https://starwell.dev/api/starwell/mcp

Data series