ERP & accounting
Foundation Software API and integration guide
FOUNDATION construction accounting offers a REST API through a gated onboarding program: a commercial evaluation first, then a sandbox, then production keys. Rate limits depend on the tier you're assigned.
Last verified October 2026 against the sources below. Confirm details with Foundation Software before you build.
At a glance
- Category
- ERP & accounting · Foundation Software
- API style
- REST/JSON with OpenAPI 3 specifications (the API reference sits behind the developer portal login).
- Authentication
- An API subscription key plus a bearer access token; Foundation's FAQ says access tokens expire after one hour and sandbox and production keys are separate.
- Sandbox / developer program
- Yes, after approval. Onboarding starts with a commercial evaluation; Foundation then provisions a sandbox account with test data, and production keys come at a later phase.
- Webhooks / events
- Not confirmed. Foundation's FAQ lists webhook testing guidance as coming soon.
- Rate limits
- Tiered: Foundation's FAQ lists 500 requests per minute (Standard), 2,000 (Professional) and custom (Enterprise), assigned during onboarding.
- Exports and files
- Not confirmed. Confirm with vendor.
- Marketplace / partner program
- Foundation integration partners program (listed on Foundation's partners page).
Key objects for construction workflows
- Jobs
- Cost codes and cost classes
- Customers
- Vendors
- Change orders
- Purchase orders and subcontracts
- Labor hours and time
Notes and gotchas
- API access requires a commercial evaluation and approval before you get a sandbox, so start the conversation early.
- Your rate limit depends on the tier assigned at onboarding; confirm it before sizing a backfill.
- Object coverage isn't public; get the OpenAPI specs during onboarding before committing to a scope. Objects listed here come from Foundation's integration pages.
Sources
Frequently asked questions
Does Foundation Software have an API?
Yes. Foundation offers a REST API with OpenAPI specifications through its developer portal. Access goes through an onboarding process that starts with a commercial evaluation.
Is there a Foundation API sandbox?
Yes. Once onboarding is approved, Foundation provisions a sandbox account with test data; production keys are issued later.
What are Foundation's API rate limits?
Foundation lists 500 requests per minute on Standard and 2,000 on Professional, with custom Enterprise limits, assigned during onboarding.
Next step
Connecting Foundation Software to your other systems?
Bring the systems and the report or workflow you want to fix. We'll walk through what moves, who owns each record, and what to check first.