Gsa Calc MCP server

gsa-calc

GSA CALC+ ceiling labor rates — the maximum hourly price a vendor may charge the US government for a labor category under a GSA schedule contract. Used to benchmark rates before negotiating.

Part of Pipeworx — an MCP gateway connecting AI agents to 1576+ live data sources.

Tools

Filters on all three: minexperience / maxexperience, education, worksite, businesssize, securityclearance, minrate / maxrate, sortby / sortdir.

Auth

None. api.gsa.gov/acquisition/calc/v3 is keyless — no api.data.gov key is needed, unlike gsa-auctions and gsaperdiem which do use PLATFORMDATAGOV_KEY.

Data sources

current contract year, not a negotiated or paid price.

• CALC+ Quick Rate API —
• Endpoint: https://api.gsa.gov/acquisition/calc/v3/api/ceilingrates/
• Rates come from GSA MAS contracts; the figure is the ceiling rate for the

The older calc.gsa.gov/api/rates/ path found in pre-2026 write-ups is dead (404). calc.gsa.gov now redirects to a landing page on buy.gsa.gov.

Upstream behaviour worth knowing

All measured live on 2026-08-28. The running API differs from its documentation in ways that change answers, so they are listed rather than assumed.

An unrecognised filter value is silently ignored. filter=worksite:Contractor (capital C) and filter=nonsensefield:zzz each return the complete unfiltered result set with HTTP 200 — the same total as sending no filter at all. A caller who asks for contractor-site rates and gets a confident answer may be reading every rate in the schedule. This pack validates every enum and refuses an unknown value** rather than forwarding it; the error names the accepted set. A refused call is recoverable, a silently unfiltered benchmark is not.

The vocabularies are case-sensitive in opposite directions, and there are three of them. worksite matches lowercase only (contractor); Contractor is ignored. business_size matches uppercase only (S); s returns zero rows. And the same field is spelled differently depending on where you read it — filter BA, JSON response Bachelors, CSV export small business for filter S. The pack accepts human spellings ("bachelors", "small business", "contractor facility") and maps them.

minyearsexperience is an equality filter, not a minimum. Upstream, minyearsexperience:5 returns only rows requiring exactly 5 years (667 of 4,396 for "software engineer"). Our minexperience means what a caller means by it — 5 or more — and maps to experiencerange:5,99 (2,561 rows, with requirements from 5 to 15+ years).

page and pagesize are both ignored. The JSON endpoint returns exactly 20 rows for every query; page=1, page=2 and page=3 return byte-identical rows, and pagesize=300 returns 20. export=y returns the complete matching set as CSV instead, so this pack computes percentiles from the export — basedon in every ratesummary states how many rows the numbers came from. The JSON endpoint's own total caps at 10,000 with relation: "gte"; the export count is exact.

Accept: text/csv returns 406. The export responds Content-Type: text/csv, but asking for that type is the one request it refuses. Send /.

Reading the result

Shortened. The full README is on GitHub.