polar

polar is a skill for Claude Code, Codex from ashish7802/awesome-api-skills. It costs 0 tokens per session (196 once invoked), scanned A, original, MIT.

A billing toolkit guide explains how to add subscriptions, payments, license keys, and tax handling through Polar. A Merchant of Record is a service that handles the seller-of-record and related tax duties.

In plain words
What is it for?
It helps implement checkout, subscriptions, license keys, webhook verification, and sandbox or production billing setups.
Why use it?
It addresses recurring billing, license delivery, and compliance work that would otherwise need separate systems.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit It helps implement checkout, subscriptions, license keys, webhook verification, and sandbox or production billing setups.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ashish7802/awesome-api-skills/polar
Install

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.

Any agent
npx skills add ashish7802/awesome-api-skills --skill polar
Clone the repo
git clone --depth 1 https://github.com/ashish7802/awesome-api-skills

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for polar

README.md
[![agentmods](https://agentmods.dev/badge/skills/ashish7802/awesome-api-skills/polar/github.svg)](https://agentmods.dev/skills/ashish7802/awesome-api-skills/polar)
Your own site
<a href="https://agentmods.dev/skills/ashish7802/awesome-api-skills/polar"><img src="https://agentmods.dev/badge/skills/ashish7802/awesome-api-skills/polar/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.

agentmods 80×15 button for polar

Your own site · 80×15
<a href="https://agentmods.dev/skills/ashish7802/awesome-api-skills/polar"><img src="https://agentmods.dev/badge/skills/ashish7802/awesome-api-skills/polar.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 196 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.00196
Opus 5.5 $0.00000 $0.00078
Sonnet 5.5 $0.00000 $0.00039
Haiku 4.5 $0.00000 $0.00020

Measured yesterday against content hash b030a9c60022, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

polar 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 yesterday.

The scan reads SKILL.md. This mod also ships 1 executable file (examples/webhook-checkout.ts), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/polar/SKILL.md · 22 lines

What it actually says

Polar Billing & Merchant of Record Skill

Overview

Polar (@polar-sh/sdk) provides developer-first billing, subscriptions, automated license keys, and global tax compliance (Merchant of Record).

Installation

npm install @polar-sh/sdk

AI Pitfalls

  • Sandbox vs Production Server: When testing with Sandbox tokens, explicitly pass server: 'sandbox' to new Polar({ accessToken, server: 'sandbox' }).
  • Webhook Signature Verification: Always pass the raw request string body and headers to validateEvent from @polar-sh/sdk/webhooks.

Production Checklist

  • POLAR_ACCESS_TOKEN and POLAR_WEBHOOK_SECRET stored in server environment
  • Webhook handler verifies signatures via validateEvent
  • Checkout sessions pass products: [productId] array

Last Verified: 2026-10-21

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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.

  1. yesterday First seen · 22 lines · 0 tokens per session scan A b030a9c60022

Subscribe to this mod's changes

polar is a skill published in the GitHub repository ashish7802/awesome-api-skills (13 stars, last pushed 2d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 196 tokens. 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 2026-10-22.

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