Math.
Data.
Decisions.
Zelvyn is a mathematical, statistical and business analytics platform with a developer-friendly API. Predictable JSON endpoints, a consistent response envelope, and an OpenAPI 3.1 specification behind every result.
Arithmetic, percentage change, powers and roots, logarithms, factorials, greatest common divisors, permutations and combinations — every call is stateless and returns an envelope you can branch on.
curl -sS -X POST 'https://api-zelvyn.devs.surf/api/v1/math/add' \
-H 'Content-Type: application/json' \
-d '{"values":[12,8,25]}'Every success returns { success, data, meta }; every error returns { success, error, meta }.
The statistics surface currently exposes the arithmetic mean of a dataset of up to 10,000 values. Additional descriptive statistics will follow the same contract — when new operations land in the API, they appear here automatically.
curl -sS -X POST 'https://api-zelvyn.devs.surf/api/v1/statistics/mean' \
-H 'Content-Type: application/json' \
-d '{"values":[12,15,11,19,14]}'Profit and margin, markup, ROI and ROAS, CAGR, break-even, conversion, CTR, CPC, CPM, CPA, CAC, AOV, retention, churn and customer lifetime value.
Overview, authentication, API keys, every operation group, errors, rate limits, quotas, versioning and status codes — generated from the real OpenAPI specification.
Read the docsPick any public endpoint, fill in the payload, and see the live envelope, request id, status and latency. No account required.
Open the explorerGenerated clients, typed schemas and examples come straight from the published specification. Copy-paste cURL or JavaScript examples that match real contracts.
Fetch openapi.jsonTry Zelvyn
Create an account to unlock plan-based rate limits and monthly quotas for your API keys. The calculation API itself is public and free to try.