Working with AI APIs

Practice

OpenAI-Compatible API Quickstart

Connect an OpenAI-compatible API: contract check, minimal request and preparing for production load.

Practice

How to Calculate AI API Cost by Tokens

Token cost math: input/output rates, dialog history growth, cache, retries and a monthly estimate method.

Practice

AI API Errors: Handling 401, 402, 429 and 503

Error code playbook: permanent vs transient, retry policy with backoff, idempotency and per-key diagnostics.

Practice

Streaming AI Responses over SSE: Practical Guide

SSE streaming via Responses API: byte reading, disconnects vs completion, timeouts and final usage accounting.

Practice

Storing API Keys for AI Apps Securely

Key hygiene: server-side storage, per-environment keys, spend limits, rotation and leak response.