Does FAST publish a public API?
No. FAST, the homebuilder ERP from Constellation HomeBuilder Systems, does not publish a public API. There is no public developer documentation and no self-serve integration access for outside platforms. FAST is an on-premise system, and data enters it through the application itself or through file imports.
What does that mean for expense automation?
It means no card or expense platform can honestly claim a direct API sync with FAST. If a vendor tells you card transactions will "post automatically" into FAST, ask them how — because without a published API, the only automated-adjacent path is a structured file the system can import. For most builders running FAST, the reality today is manual: statements downloaded, receipts chased, each charge coded to the right job and keyed in by hand.
How does Vergo work with FAST?
Vergo does not pretend an API exists. Instead, Vergo provides custom-built CSV exports matched to the import format FAST expects. Card transactions land in Vergo in real time, cardholders attach receipts, and your accounting team codes each line to its job and cost code inside Vergo. When you are ready to post, Vergo generates the import file and your team loads it into FAST as a batch — coding intact, no re-keying.
What does the day-to-day workflow look like?
Superintendents and PMs spend on their cards as usual. Each charge appears in Vergo as it posts, with a receipt prompt on their phone. Coding to the job happens in the field or at the office, while everyone still remembers what the purchase was for. At whatever cadence suits your close, accounting generates the FAST import file and loads the batch — two steps in place of a statement-reconciliation afternoon. FAST itself is untouched; it just receives cleaner data, sooner.
What should FAST users take away?
Two things. First, be skeptical of any integration claim about FAST that involves the word API — the vendor has not published one. Second, the absence of an API does not mean card admin has to stay manual: the coding and data-entry work, which is where the hours actually go, can move into Vergo, leaving FAST a clean batch import.
Does FAST have a public API?
No. Constellation HomeBuilder Systems does not publish a public API for FAST, so there is no documented endpoint for third-party platforms to sync against.
Can Vergo post card transactions directly into FAST?
Not over an API — no platform can. Vergo instead produces a custom CSV export matched to FAST's import format, which your team loads into the system as a batch.
Where does job coding happen?
In Vergo. Transactions are coded to jobs and cost codes as spend happens, and that coding is carried on every line of the export file FAST imports.
Does this work with on-premise FAST?
Yes. FAST is an on-premise system, and a file-based connection suits that: the import is performed inside FAST, so nothing about your deployment needs to change.
