Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add RevenueCat/play-billing-skills --skill revenuecat-api-quick-referencegit clone --depth 1 https://github.com/RevenueCat/play-billing-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/revenuecat/play-billing-skills/revenuecat-api-quick-reference)<a href="https://agentmods.dev/skills/revenuecat/play-billing-skills/revenuecat-api-quick-reference"><img src="https://agentmods.dev/badge/skills/revenuecat/play-billing-skills/revenuecat-api-quick-reference/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/revenuecat/play-billing-skills/revenuecat-api-quick-reference"><img src="https://agentmods.dev/badge/skills/revenuecat/play-billing-skills/revenuecat-api-quick-reference.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00052 | $0.02221 |
| Opus 5 | $0.00026 | $0.01111 |
| Sonnet 5 | $0.00010 | $0.00444 |
| Haiku 4.5 | $0.00005 | $0.00222 |
Grade A, and why
revenuecat-api-quick-reference scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
89% identical to rc-revenuecat-api-quick-reference — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 291 lines — stays where its author put it; the contents beside it link to each section on GitHub.
RevenueCat API Quick Reference
Phase 0: Intent
Use this skill when you need a fast lookup of a RevenueCat API surface while writing Android code or server logic. Typical questions you answer from here:
- Which builder option controls a given
Purchases.configurebehavior? - What is the return type and signature of
awaitPurchase,awaitOfferings,awaitCustomerInfo,awaitRestore,awaitLogIn,awaitLogOut? - How do I read offering, package, product, entitlement fields?
- Which
PurchasesErrorCodeshould I branch on? - Which listener callback do I register for customer info updates?
Do not use this skill as a deep tutorial. Reach for the feature-specific skills (purchase flow, configuring the SDK, error handling, subscription states) when you need step-by-step guidance or design rationale.
Phase 1: Locate
Decide SDK surface vs REST surface before you search the tables.
Route to the SDK (client side, Android app code):
- Code runs inside the Android app, in an
Activity,ViewModel, or background worker bundled with your app. - You need to launch a purchase, restore purchases, read cached
CustomerInfo, fetchOfferings, identify or log out a user, or listen for updates. - You want entitlement gating in the UI.
Route to the REST API (server side):
- Code runs on your backend, in a webhook handler, in an admin tool, or in a scheduled job.
- You need to grant or revoke a promotional entitlement, override a subscription, look up a subscriber from another service, refund, or deliver events to another system.
- You are integrating with a system that cannot embed the SDK.
The tables in this skill cover the Android SDK 10.x surface from appendix A verbatim. For REST endpoint paths, authentication, and payloads, see the full appendix on revenuecat.com together with the backend and webhooks skills, and treat this file as the SDK index.
Phase 2: Reference Tables
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 291 lines · 52 tokens per session scan A 032a13f4c47a
revenuecat-api-quick-reference is a skill published in the GitHub repository RevenueCat/play-billing-skills (53 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 52 tokens to every session and 2,221 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 89% identical to rc-revenuecat-api-quick-reference, differing in 4 lines, and is treated as a copy.
Other skills, from other repositories
play-billing-library-version-upgrade
Use this skill when upgrading or migrating an Android project from any legacy Google Play Billing Library (PBL) version to the latest stable version of PBL.
asc-revenuecat-catalog-sync
Reconcile App Store Connect subscriptions and in-app purchases with RevenueCat products, entitlements, offerings, and packages using asc and RevenueCat MCP. Use when setting up or syncing subscription catalogs across ASC and RevenueCat.
axiom-implement-iap
Use when the user wants to add in-app purchases, implement StoreKit 2, or set up subscriptions.
google-play
Google Play Developer API (Android Publisher) integration with managed OAuth. Manage apps, subscriptions, in-app purchases, and reviews. Use this skill when users want to interact with Google Play Console programmatically. For other third party apps, use the api-gateway skill (https://clawhub.ai/byungkyu/api-gateway).
subscription-lifecycle
Generates StoreKit 2 subscription lifecycle management — grace periods, billing retry, offer codes, win-back offers, upgrade/downgrade paths, and subscription status monitoring. Use when user needs post-purchase subscription state handling beyond the initial paywall.
subscription-offers
Generates StoreKit 2 code for all subscription offer types — introductory, promotional, offer codes, and win-back. Includes eligibility checks, offer presentation, and the preferredSubscriptionOffer modifier. Use when adding subscription offers, free trials, or promotional pricing.