If you've ever built an API that charges money, you know the pain. You set up your payment provider, create your pricing tiers, and start collecting payments. But then comes the hard part: actually enforcing those plans.
How do you issue API keys? How do you make sure Pro customers get more requests than Free customers? How do you handle upgrades and cancellations in real-time?
These questions led us to build Holdify.
The Problem
Most developers end up building this infrastructure themselves. They create database tables for API keys, write middleware for rate limiting, set up webhook handlers for subscription changes, and build dashboards for usage tracking.
It works, but it takes weeks to build and months to get right. And there are edge cases everywhere: failed webhooks, mid-cycle upgrades, grace periods, abuse prevention.
The Solution
Holdify handles all of this with a single API call:
- 1 Connect your payment provider: Sync with Polar to know who's paying for what
- 2 Define your plans: Set request limits and feature flags per tier
- 3 Verify at request time: One API call returns validity, plan, and remaining quota
No webhook handlers to maintain. No race conditions to debug. No stale data to worry about.
What Makes Holdify Different
Native Payment Provider Integration
Connect your Polar account once and entitlements sync automatically. When a customer upgrades, their limits update instantly. When they cancel, access is revoked at the end of their billing period.
Request-Time Enforcement
We don't just store limits. We enforce them. Every verify call checks the key's validity, current usage, and entitlements.
Built for Scale
Our verify endpoint runs on edge infrastructure worldwide with P99 latency under 50ms.
Pricing
150K requests/month, 1,000 keys
500K requests/month, unlimited keys
2M requests/month, unlimited keys
Custom limits, SSO, SLA
Get Started Today
We're live and ready. Sign up, connect your payment provider, and start verifying API keys in minutes.
- The Holdify Team