U.S. Department of the Treasury, Bureau of the Fiscal Service · Debt to the Penny each federal business day; the Monthly Treasury Statement around the 8th business day of the following month (later publications revise comparatives, but served MTS values are as-first-published); average interest rates monthly; Treasury reporting rates of exchange quarterly; historical debt outstanding annually at fiscal year end.
License: public-domain · official terms. Attribution text and per-series license flags ride in every API envelope.
Quickstart
Latest observations, with provenance and citation on every value:
curl "https://starwell.dev/api/starwell/v1/sources/fiscaldata/series/mts_table_1:receipts/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 Current Month Gross Receipts Amount, monthly, as first publi?", "source": "fiscaldata"}'
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