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/ai-toolkit --skill rc-alternative-billinggit clone --depth 1 https://github.com/RevenueCat/ai-toolkitWrote 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/ai-toolkit/rc-alternative-billing)<a href="https://agentmods.dev/skills/revenuecat/ai-toolkit/rc-alternative-billing"><img src="https://agentmods.dev/badge/skills/revenuecat/ai-toolkit/rc-alternative-billing/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/ai-toolkit/rc-alternative-billing"><img src="https://agentmods.dev/badge/skills/revenuecat/ai-toolkit/rc-alternative-billing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
- Socket pass
- Snyk warn
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 | $0.00050 | $0.01019 |
| Opus 5 | $0.00025 | $0.00509 |
| Sonnet 5 | $0.00010 | $0.00204 |
| Haiku 4.5 | $0.00005 | $0.00102 |
Grade A, and why
rc-alternative-billing 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.
How it starts
The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Alternative Billing Programs
Google runs several programs that let you collect payment outside standard Play Store billing. This skill tells you which pieces the RevenueCat Android SDK covers today and which ones you implement yourself against the Play Billing Library.
Per the handbook chapter, RevenueCat has limited support for these programs as of SDK 9.x. Treat that as the status of record; check the RevenueCat changelog for any newer SDK releases before you start work.
Phase 1: Discovery
Answer these before writing any code.
| Question | Why it matters |
|---|---|
| Which program are you targeting? | User Choice Billing, Alternative Billing Only, External Offers, and External Payment Links each have different Play requirements. |
| Is your app eligible in the target region? | Google gates these programs by country and app category. You enroll through Play Console, not through RevenueCat. |
| Are you using RevenueCat Web Billing instead? | RevenueCat's web checkout is a separate product from Google's alternative billing. Do not conflate the two. |
| Which RevenueCat SDK version are you on? | Support evolves per release. What is unsupported in SDK 9.x may land later. |
If you actually want to sell subscriptions via a RevenueCat-hosted web checkout, that is not one of Google's alternative billing programs. Use Offering.webCheckoutURL or Package.webCheckoutURL:
val pkg = offerings.current?.monthly
pkg?.webCheckoutURL?.let { url ->
startActivity(Intent(Intent.ACTION_VIEW, Uri.parse(url.toString())))
}
After the user completes that purchase on the web, they redeem it in-app via deep link handling.
Phase 2: Plan
Decide which of the two paths fits.
Path A: Wait for SDK support. If your launch timeline is flexible, watch the RevenueCat changelog and docs for first-class support of the specific program you need. This avoids running raw Play Billing Library code alongside RevenueCat.
Path B: Hand roll the integration. If you must ship now, implement the Play Billing Library APIs for the target program directly. The RevenueCat SDK owns the BillingClient instance, so running raw BillingClient calls alongside it needs care.
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 · 95 lines · 50 tokens per session scan A baa2afec2338
rc-alternative-billing is a skill published in the GitHub repository RevenueCat/ai-toolkit (65 stars, last pushed 8d ago), licensed MIT. It adds 50 tokens to every session and 1,019 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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.