Breaking contract change
Interactions API
- response.outputs[]
+ response.steps[]
Potential impact Response parsing and stateless history may require migration.
Third-party API contract monitoring
See the API contract change before it becomes your integration incident.
Source-linked before/after evidence, affected operations, and the engineering check your small SaaS team should run next.
Concept validation using public contracts only. No API keys, private specifications, cards, or payment.
Breaking
The problem
Provider notices are scattered. Raw diffs lack your next move.
Your product depends on several external APIs. ContractSignal watches public, versioned sources and turns a potentially incompatible change into evidence your team can review.
01
Observe
Track a public OpenAPI contract over time.
02
Compare
Classify semantic changes with deterministic rules.
03
Act
Receive exact evidence and a bounded engineering check.
Built for a narrow team
Small SaaS teams running on third-party APIs.
For founder-engineers and integration engineers in 2-20 person teams that depend on three or more external APIs.
- Customer-facing product in production
- Public provider contracts available
- Integration failures have an engineering cost
Price test
What would contract-level evidence be worth?
No charge will be made. Your choice is stated interest, not a purchase.
$19/ month
Essential monitoring
Reference$29/ month
More providers, faster alerts
$49/ month
Portfolio evidence + webhook