7 min read
How an AI agent funds and pays for its own API calls
Registration, balance and top-up as three HTTP calls instead of three web forms. The flow, the caps that keep it safe, and when a human is still required.
Nemanja, Founder @ ApexApi
ApexApi Blog
Guides, model deep-dives, and how-tos for building with every AI model through one API.
7 min read
Scrape, crawl and extract on the same key as your models
Three web context endpoints on the balance that already pays for inference. What each one costs, when to reach for which, and what you stop maintaining.
Nemanja, Founder @ ApexApi
7 min read
Structured output across providers, and where it fails
JSON mode is three different guarantees wearing one name. What ports between providers, what gets silently ignored, and why you validate anyway.
Nemanja, Founder @ ApexApi
7 min read
Video generation APIs compared by real cost per second
Veo, Seedance, Kling, Hailuo and Grok Imagine priced per second of output. A five-second clip runs from thirty cents to three dollars. Where the gap goes.
Nemanja, Founder @ ApexApi
8 min read
Picking a model for your coding agent, by the numbers
Output price dominates an agent's bill, not input price. Four catalog fields that decide whether a model can drive an agent at all, and how to read them.
Nemanja, Founder @ ApexApi
7 min read
How to use Claude with the OpenAI SDK, and what breaks
Keep the OpenAI client, change three values, call Claude. What survives the translation, what has no equivalent, and when to use the native SDK instead.
Nemanja, Founder @ ApexApi
8 min read
Why tool calling breaks when you switch AI providers
The request format ports. Tool calling does not. Opaque IDs, hidden state, silently dropped context and the 400 that only fires on the second turn.
Nemanja, Founder @ ApexApi
7 min read
How to connect Cline to every model with one API key
Two fields in Cline settings and every model becomes selectable. The setup, the three fields people get wrong, and how to switch models mid-task.
Nemanja, Founder @ ApexApi
8 min read
Which AI gateway should a small team actually pick?
OpenRouter, LiteLLM, Portkey, Helicone and ApexApi solve different problems. Five questions that decide it, and an honest answer on where each one wins.
Nemanja, Founder @ ApexApi