# Potarix Enricher - Billing and credits (modular reference)

> Section-level billing reference. Parent: https://enricher.potarix.com/llms.txt . Pricing: https://enricher.potarix.com/pricing.md

## Model

- Pay per lookup. $0.01 per credit. No subscription. Credits never expire.
- 25 free trial credits on signup. Whiffed and repeat lookups are free.

## Credit packs

- `1k`: 1,000 credits, $10
- `5k`: 5,000 credits, $50
- `25k`: 25,000 credits, $250

## Endpoints

- `GET /billing/products` (no auth): list the credit-pack tiers.
- `POST /billing/checkout` (auth): Stripe Checkout URL to add a card (one human browser trip).
- `POST /billing/topup` (auth): silent off-session top-up once a card is on file.
- On `402` (out of credits): top up, then retry the lookup.

## Links

- [Pricing (machine-readable)](https://enricher.potarix.com/pricing.md)
- [OpenAPI spec](https://enricher.potarix.com/openapi.yaml)
- [Auth reference](https://enricher.potarix.com/llms/auth.txt)