Billing

Billing endpoints manage subscriptions and usage-based billing.

Plans

PromptJang has two plans. No free tier.

Plan	Price	Events/mo	Retention	Payload	Replay/mo
Starter	$29/mo	100,000	7 days	256 KB	1,000
Pro	$69/mo	1,000,000	30 days	2 MB	20,000

Overage Pricing

Usage beyond plan limits is billed at pay-as-you-go rates:

Resource	Starter	Pro
Events (per 100K)	$0.40	$0.20

Pro overage is intentionally cheaper to incentivize upgrades.

Create Checkout Session

POST /api/v1/billing/checkout

Request Body

{
  "plan": "starter",
  "success_url": "https://app.promptjang.net/dashboard",
  "cancel_url": "https://app.promptjang.net/billing"
}

Response

{
  "url": "https://checkout.stripe.com/..."
}

Redirect the user to the Stripe checkout URL.

Customer Portal

GET /api/v1/billing/portal

Query Parameters

Param	Required	Description
return_url	Yes	URL to redirect after portal session

Response

{
  "url": "https://billing.stripe.com/..."
}

Redirect the user to the Stripe customer portal to manage their subscription, view invoices, and update payment methods.

Usage Metering

PromptJang meters all event usage per billing period. Events beyond the included plan allowance are billed at the overage rates — your events are never dropped due to usage. Overage charges appear on the next invoice.

Note: Billing is currently in development. Contact support for early access.