Make beliefs visible
List consumer, traffic, data, security, reliability, and commercial assumptions.
API ASSUMPTION REGISTER
API Assumption Register
Register API assumptions and calculate test coverage, evidence strength, high-impact exposure, and contradictory findings.
- Uses your inputs in a transparent calculation
- Instant result with practical next steps
- No signup required
Planning guidance only. Validate important decisions with customer evidence and your delivery team.
YOUR INPUTS
Build your result
Complete every field. The result updates only when you choose Calculate.
How it works
Measure evidence
Test coverage and linked evidence improve readiness; contradictions and exposed high-impact beliefs reduce it.
Sequence learning
The output directs the next test toward the riskiest unsupported assumption.
Continue learning: How to write an MVP brief · Who should own the MVP PRD?
Frequently asked questions
What does the API Assumption Register calculate?
It turns the entered operational evidence into a transparent estimate or recommendation. The result changes when the material inputs change and shows the assumptions used.
Is this result a guarantee or technical approval?
No. It is an early planning signal, not a security review, architecture approval, vendor commitment, or production-readiness certification.
What data should I enter?
Use current measurements where available and label estimates clearly. Revisit the result when traffic, scope, provider limits, costs, or ownership changes.
Can I use this result in a planning workshop?
Yes. Use the details and next steps to expose assumptions, then have the responsible product and engineering owners validate them.
How We Compare
| Feature | MVPHub | Postman | Stoplight |
|---|---|---|---|
| Focused planning calculation | Included | Limited | Limited |
| Transparent input-based result | Included | Limited | Limited |
| Immediate planning next steps | Included | Limited | Limited |
MVPHub provides a focused planning calculation from the evidence entered here. Postman is a broad API platform for design, testing, documentation, monitoring, and collaboration; Stoplight focuses on OpenAPI design, documentation, mocking, and governance workflows.
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