---
title: Credits
description: Prepaid credits your customers spend, served on api.sylphx.com.
type: explanation
product: credits
summary: What a Credit Grant is, and how it offsets what a customer is invoiced.
updated: 2026-10-07
order: 0
---

Credits lets you give your customers credit that their invoices spend. A
**Credit Grant** gives one subject an amount, or a monthly cap, between a start
and an expiry, with who approved it and why. Usage is invoiced at full price,
then the subject's grants offset it once, when the invoice is issued, soonest
expiry first. A grant is never edited: a change is a new grant that supersedes
the old one, so the history stays audited.

## Where it is served

Credits is served by Sylphx Money on the one API. Every call is
under `https://api.sylphx.com/v1/orgs/{org}/projects/{project}/envs/{env}/`
and takes a Sylphx key with the scope its method names in the API reference
([keys and scopes](/docs/platform/keys-and-scopes)).

## The resources

| Collection | What it is |
| --- | --- |
| [credit grants](/docs/api/credit_grants) | A Credit Grant is credit a merchant gives a subject: audited, append-only, invoiced at full price and then offset once at invoice issue, soonest expiry first. |

Each link opens the collection's methods, with the path, scope, request,
response and examples of every call. Credits offsets invoices of
[Payments](/docs/payments) usage billing.

- [Every product you can use today](/docs)
- [Credits in the catalogue](/products/credits)