# Polar

**Canonical:** https://apis.io/providers/polar-sh/  
**Website:** https://polar.sh/  
**APIs profiled:** 11

Polar is an open-source, developer-first monetization platform that acts as a Merchant of Record (MoR), handling billing, payments, and global sales tax so software teams can sell digital products, subscriptions, usage-based billing, and license keys. The Polar API (https://api.polar.sh/v1) exposes products, prices, checkouts, customers, subscriptions, orders, benefits, license keys, a customer portal, usage meters/events, and webhooks behind Bearer organization access tokens. Not affiliated with Polar Electro (fitness wearables) or the Polaris design system.

## Kin Score — 34.9 / 100 (thin)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 34.9).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 49.7 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 34.2 |
| Developer Ergonomics | 23.8 |
| Commercial Clarity | 39.5 |
| Access Clarity | 39.5 |

Regulatory layer — **Payments**: 18.8 (matched via tags).

## Agent readiness — 19.8 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Paid · Self-serve signup — onboarding: self-serve, pricing: paid, trial: no (confidence: high).

## APIs (11)

- **Polar benefits API** — Benefits (entitlements) attached to products.
- **Polar checkouts API** — Hosted checkout sessions and reusable checkout links.
- **Polar customer_portal API** — Customer-facing portal endpoints (Customer Session token).
- **Polar customers API** — Customers, external IDs, and aggregated customer state.
- **Polar events API** — Usage event ingestion for metered billing.
- **Polar license_keys API** — License key issuance, validation, and activation.
- **Polar meters API** — Usage meters aggregating ingested events.
- **Polar orders API** — Orders, invoices, and receipts.
- **Polar products API** — Product catalog and embedded pricing.
- **Polar subscriptions API** — Recurring subscriptions.
- **Polar webhooks API** — Webhook endpoint management and deliveries.

## Agentic access (1)

- **Polar Sh Agentic Access** — 39 operations · 17 acting · 1 human-in-the-loop

## Security (2)

- **Polar Sh Authentication** — http · 1 scheme
- **Polar Sh Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Plans (1)

- **Polar Sh Plans Pricing**

## Tags

Billing, Payments, Merchant of Record, Monetization, Subscription, Usage-Based Billing

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/polar-sh/). Scores are computed from the provider's own public artifacts under a published rubric.