AI and developer tools · Developer tools
Schema Contract Guard Your APIs changed. You'll know first.
Watch third-party API endpoints, set the expected shape of their JSON responses and get alerted the moment the shape drifts.
For platform and agent-ops teams that depend on third-party APIs.
Live $19/month, $190/year · 14-day free trial
How to start
Add an endpoint
Register the public https address of the API you depend on.
Set the contract
Learn the shape live, paste a sample or paste a JSON Schema.
Get alerted on drift
Each check shows ok, drift or error, and you are told when the status changes.
What you get
Set the expected shape
Learn it live, paste a sample response or paste a JSON Schema.
Checks on a schedule
Check every 5 minutes, hourly or daily, on demand from the dashboard, or from your own code.
A field-level report
Each check is recorded as ok, drift or error, with a precise difference by field.
Alerts when status changes
Get in-app notifications and an optional signed webhook. Recoveries are reported too.
Headers for private APIs
Add request headers for APIs that need authentication.
See it in action
Everything included
- Endpoint watching for public https APIs
- Expected shape from a live response, a sample or a JSON Schema
- Checks every 5 minutes, hourly or daily, on demand, by machine API or by pushing a payload you already have
- A field-level difference report
- In-app alerts and an optional signed webhook
- Interface in 11 languages
- A Usage page that counts checks
Pricing
$19 per month
$190 per year
That works out at about $15.83 a month when paid yearly.
14-day free trial. A card is required to start. You are charged when the trial ends unless you cancel first. One free trial per customer and card.
Cancel at any time. Your plan stays active until the end of the period you have paid for.
Yearly plans: you may ask for a full refund within 14 days of the first yearly charge. See the Refund policy.
Prices are in US dollars.
Questions
How often can it check?
Every 5 minutes, hourly or daily on a schedule, on demand from the dashboard, or from your own code.
What does a check tell me?
Whether the response is ok, has drifted or has failed, with a precise difference by field.
How does the free trial work?
You get 14 days free. We ask for a card when you start. You are charged when the trial ends unless you cancel first. One free trial per customer and card.
Can I cancel?
Yes, at any time. Your plan stays active until the end of the period you have paid for, and we do not charge you again. If you prefer, write to [email protected] and we will cancel it for you.
Start with Schema Contract Guard
Coming later: Email alerts (email is not switched on yet).
AI can make mistakes. Please check everything before you use it.
Questions? Write to [email protected]. See all products.