Pricing
The determination tool on the home page is free and always will be. You pay when you need the API at volume or you screen projects in batches rather than one at a time.
Sandbox
$0
No signup. The key is published.
- 25 determinations per hour
- Full engine and the whole ruleset
- MCP server included
- Provenance on every verdict
- Batch determination is not included
pb_sandbox_publickeyRead the docsPro
For teams$49/month
- 5,000 determinations per day
- Batch determination, up to 100 projects per call
- Everything in Sandbox
- Cancel yourself at any time from the billing portal
The figure above is read from Stripe at render time, so what you see is what checkout charges. Your key appears immediately after payment and can be reissued at /recover if you lose it.
Not built yet
Alerting you when the Corps reissues or modifies a permit is planned and is not implemented, so it is not part of any tier and you are not paying for it. The nationwide permits are reissued on a five year cycle and the current one runs to 15 March 2031, with modifications possible in between. Until the alerting exists, the ruleset cycle and its effective date are on every API response and on the coverage page, so you can check what you are being answered from.
A free tier with a personal key is also not built. It would need accounts, and there are deliberately none: no sign-up, no password, no user table to leak. Until that changes, the shared sandbox key above is the free tier, and it is the same engine with the same provenance.
For agents
Pricing is published as JSON at /pricing.json so an agent can decide programmatically whether to use us, and the sandbox key is in it. See the API docs and the MCP server.