Glossary
Use this glossary when reading Happy Endpoint API references and integration guides. The definitions focus on the terms developers need when building production data workflows.
API and integration terms
Endpoint
A specific HTTP method and path, such as GET /search or GET /product-details. Each endpoint has its own required and optional parameters.
API reference
The interactive Scalar page for one API. It shows endpoints, parameters, response examples, authentication details, and request samples for that API.
OpenAPI
A machine-readable specification for endpoints, parameters, responses, and authentication. The API reference pages are generated from OpenAPI documents.
RapidAPI host
The API-specific host value sent in the X-RapidAPI-Host header. Copy this value from the RapidAPI listing for the exact API you are using.
Rate limit
A request limit applied by RapidAPI based on your plan. When you exceed it, requests may return 429 Too Many Requests until the window resets.
Credit
A unit of billable usage tracked through RapidAPI according to your subscription and the API endpoint being called.
Plan tier
The RapidAPI subscription level for an API. Happy Endpoint APIs use Basic, Pro, Ultra, and Mega plans, with different request limits per API.
Quota
The number of API requests included in a plan for a daily or monthly period. Quotas can differ between APIs and plan tiers.
Overage
Extra usage beyond a plan quota when the selected RapidAPI plan allows additional billed requests instead of stopping at a hard limit.
Backoff
A retry strategy that waits longer after each failed attempt. Backoff is commonly used for 429 responses, timeouts, and 500-range errors.
Correlation ID
An identifier your application attaches to logs for one workflow or request chain. It helps connect user actions, API calls, retries, and errors.