Usage-based pricing for product and engineering teams evaluating bounded tax-compute workflows. Read the supported envelope first, then run a computed call and a deterministic decline so billing and retry behavior are clear before production integration.
$0/mo
Evaluate forever — no card.
$29/mo
For a production integration.
$99/mo
Growing usage + analytics.
$399/mo
High volume + priority support.
Contracted volume, support, and enterprise terms for teams operating inside the supported envelope.
200is billable whether the engine computed a result or honestly declined — you pay for the answer, including a clean “this case is out of scope.”4xx (bad request) and 5xx (server / metering) responses are never billed.Idempotency-Key and a retry replays the first response, billed exactly once — no double-charge on a network hiccup.429 until the next cycle or an upgrade. The limit is shared across all of your API keys.429 (retry in a moment), never a charge.This pricing page is the billing reference for the current plans. See the API docs, supported envelope, and terms for the full request/response contract, legal notice, and error semantics.