Billing

Billing endpoints are only available in cloud mode. Self-hosted deployments manage billing externally. All endpoints require admin role.

Base URL: https://api.airaproof.com/api/v1

Plans & Pricing

Plan	Monthly	Governed Ops	Seats	Case Overage	Action Overage	Support
Free	€0	20	3	Hard wall (429)	Hard wall (429)	Community
Pro	€999	5,000	Unlimited	€0.20/case	€0.15/op	Email
Business	€2,499	25,000	Unlimited	€0.10/case	€0.08/op	Priority, 99.5% SLA
Enterprise	Custom	Unlimited	Unlimited	Custom	Custom	Dedicated, 99.9% SLA, self-hosted

All features are available on all plans. BYOK (Bring Your Own Key) and BYOM (Bring Your Own Model) are available on every plan — use your own API keys or self-hosted models. BYOK/BYOM operations still count against your governed ops quota.

Model availability by plan

Models	Free	Pro	Business	Enterprise
Claude Sonnet 4.6, Haiku 4.5	Yes	Yes	Yes	Yes
GPT-5.4, 5.2, Mini	Yes	Yes	Yes	Yes
Gemini 3.5 Flash, 3.1 Pro/Lite	Yes	Yes	Yes	Yes
DeepSeek, Grok, Devstral, Kimi, Qwen	Yes	Yes	Yes	Yes
Claude Opus 4.8, 4.7, 4.6	No	Yes	Yes	Yes
GPT-5.5, o3	No	Yes	Yes	Yes

Free tier is restricted to cost-efficient models. Upgrade to Pro for access to flagship models.

What counts as an operation?

An operation is any billable event on your monthly counter. Every billable event is 1 op; cases use the case rate, everything else uses the op rate.

Event	Fired by	Billable
`case_run`	`POST /api/v1/cases`	1 op (case rate)
`action_authorize`	`POST /api/v1/actions` — at policy decision	1 op
`chat`	`POST /api/v1/chat`	1 op per message
`compliance_bundle`	`POST /api/v1/compliance/bundles`	1 op per bundle
`settlement`	`POST /api/v1/settlements` (admin)	1 op per sealed batch
`drift_check`	`POST /api/v1/agents/{id}/drift/check`	1 op per check

Agent actions bill at authorize, not notarize. The expensive compute — policy engine evaluation, any LLM calls in AI/consensus mode, content scan, and the multi-party signature on the PolicyEvaluation row — all happens inside POST /api/v1/actions. The follow-up POST /api/v1/actions/{id}/notarize is a free bookkeeping call that just mints the Ed25519 receipt for the outcome your agent reports.

This means denied-by-policy and held-for-approval actions also bill: the policy decision is the artifact you're paying for, regardless of what the agent was ultimately allowed to do.

Code Governance (PR scans) also bill at authorize time — each PR scan is 1 op. The LLM calls for AI/consensus policies have already executed by the time the usage event fires, so PR scans always bill regardless of the policy outcome.

You can't notarize without authorizing first. The action_uuid in the notarize URL is a server-assigned identifier that only exists after POST /api/v1/actions creates the action row. If you pass an unknown id you get 404 NOT_FOUND; denied or pending-approval actions return 409 INVALID_ACTION_STATE. Every successful notarize is backed by exactly one billable authorize in the same org, so the free-notarize rule can't be used to avoid paying for compute.

The following are not billed — they stay free on every plan:

Notarize: POST /api/v1/actions/{id}/notarize is free — and it only succeeds for actions that were previously authorized by your org, so the decision has always been paid for already.
Reads: every GET endpoint, including verification, inclusion proofs, and bundle exports.
Workflow metadata: approvals, denials, cosignatures, drift-alert acknowledgements, legal-hold release.
One-time setup: drift baseline computations (production, synthetic, pooled).
Retries with the same idempotency_key — they return the original resource without a second charge.

Create Checkout Session

POST /api/v1/billing/checkout
Authorization: Bearer <token>

Redirects to Stripe Checkout for plan upgrade. Only pro and business plans are available for self-service.

Request Body

Field	Type	Required	Description
`plan`	string	Yes	Target plan: `pro` or `business`
`success_url`	string	Yes	URL to redirect after successful checkout
`cancel_url`	string	Yes	URL to redirect if checkout is cancelled

Response

{
  "checkout_url": "https://checkout.stripe.com/c/pay/cs_test_...",
  "request_id": "req_abc123"
}

Behavior

Free → Pro/Business: Creates a new Stripe Checkout session
Pro → Business: Upgrades inline (swaps subscription items, prorated)
Same plan: Returns error (You are already on the pro plan.)
Downgrade: Not supported via self-service. Use the billing portal to cancel, then resubscribe.

Create Portal Session

POST /api/v1/billing/portal
Authorization: Bearer <token>

Opens the Stripe Customer Portal for subscription management (update payment method, view invoices, cancel subscription).

Request Body

Field	Type	Required	Description
`return_url`	string	Yes	URL to return to after portal session

Response

{
  "portal_url": "https://billing.stripe.com/p/session/...",
  "request_id": "req_abc123"
}

Billing Status

GET /api/v1/billing/status
Authorization: Bearer <token>

Returns current subscription status.

Response

{
  "plan": "pro",
  "has_subscription": true,
  "billing_period_end": "2026-04-26T00:00:00Z",
  "cancel_at_period_end": false,
  "request_id": "req_abc123"
}

Field	Type	Description
`plan`	string	Current plan: `free`, `pro`, `business`, `enterprise`
`has_subscription`	boolean	Whether a Stripe subscription exists
`billing_period_end`	string/null	ISO 8601 datetime of period end
`cancel_at_period_end`	boolean	Whether subscription cancels at period end

Stripe Webhook

POST /api/v1/billing/stripe/webhook

No authentication — verified by Stripe signature. Handles:

Event	Action
`checkout.session.completed`	Activates plan, stores subscription ID
`customer.subscription.updated`	Syncs plan and billing period
`customer.subscription.deleted`	Reverts to free plan
`invoice.paid`	Logged for audit
`invoice.payment_failed`	Logged as warning (Stripe handles retry)

Overage Billing

When a paid plan exceeds its included operations:

Each usage event (case run, action notarization) is reported to Stripe's Billing Meter
Stripe aggregates usage over the billing period
At the end of the period, overage is invoiced alongside the base subscription

Overage is never charged on the free plan — free users hit a hard wall (HTTP 429) at 20 governed operations per month.

Testing

Use Stripe test mode with card 4242 4242 4242 4242 (any future expiry, any CVC). Test webhook events with the Stripe CLI:

stripe listen --forward-to localhost:8001/api/v1/billing/stripe/webhook

Billing

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