ZAPINNER

Correlations API

Computes the Pearson correlation coefficient for every pair of numeric fields and labels each pair's strength and direction. Deterministic and dependency-free.

What it does

Pairwise Pearson correlation across numeric fields.

When to use it

Reach for Correlations when you need to answer: “Which numeric fields move together?” It sits in the Understand stage of the catalog — compare records and explain results.

Endpoint & cost

POST /api/v1/correlations

Cost: Per credit. Zaps draw down your shared monthly allowance; requests that fail validation are not charged.

Authentication

Send your key as a bearer token: Authorization: Bearer zap_live_…. See Authentication for key management and the alternate header.

Example request

curl https://zapinner.com/api/v1/correlations \
  -H "Authorization: Bearer zap_live_••••••" \
  -H "Content-Type: application/json" \
  -d '{"data":[{"x":1,"y":2},{"x":2,"y":4},{"x":3,"y":6}]}'
Every response is structured JSON and includes a request_id. Full field-level request and response schemas for this endpoint live in the OpenAPI spec and the API reference.

Errors & limits

Errors use one consistent shape ( error.code, error.message, request_id). See Errors and Rate limits.

SDK

Correlations has typed methods in both the JavaScript and Python SDKs. Both are implemented and package-ready but not yet published to npm / PyPI — until they ship, vendor the package source or install from a git ref, or call the endpoint over HTTPS with the example above.

Try it

Select Correlations in the playground to see the request, or run it live with your API key.

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