SubToAPI Blog
Claude API Curl Example: Requests, Headers & Errors
A practical curl example for the Claude API, covering headers, request bodies, streaming, error handling, and a SubToAPI-compatible variant.
2026-08-31 · 4 min readClaude API JavaScript Example: Requests, Streaming & Tools
A working Claude API JavaScript example covering basic requests, streaming responses, tool use, and error handling with Node.js and fetch.
2026-08-31 · 4 min readAI API Gateway: Features That Actually Matter
What an AI API gateway does, which features are essential, and how to evaluate one before you build production traffic on top of it.
2026-08-31 · 5 min readLLM API Gateway: What It Is and When You Need One
An LLM API gateway sits between your app and model providers, handling auth, routing, and observability. Here's how it works and how to pick one.
2026-08-31 · 5 min readClaude Function Calling: A Practical Implementation Guide
Learn how Claude function calling works in practice, with schema examples, multi-step tool loops, error handling, and streaming patterns.
2026-08-31 · 5 min readClaude Tool Use: How It Works and How to Implement It
Learn how Claude tool use works, how to define tools, handle tool_use blocks, and build multi-step agent workflows with real code examples.
2026-08-31 · 5 min readClaude Streaming API: How Token Streaming Works
How the Claude streaming API delivers tokens in real time, how to implement it with SSE, and how to add it to your app in minutes.
2026-08-31 · 5 min readAnthropic API Key: What It Is and How to Manage It
What an Anthropic API key is, where to get one, how to secure it, and what to do when console billing isn't the right fit for your team.
2026-08-31 · 5 min readClaude API Tutorial: Build Your First Integration
A hands-on Claude API tutorial covering authentication, messages, streaming, and tool use, with working code examples for your first integration.
2026-08-31 · 5 min readHow to Use the Claude API: A Practical Setup Guide
Learn how to use the Claude API step by step: authentication, your first request, streaming, tool use, and common integration patterns for developers.
2026-08-31 · 5 min readClaude API Pricing Explained: Costs, Tiers & Alternatives
A clear breakdown of how Claude API pricing works, what drives your bill up, and how to get predictable flat-rate access instead.
2026-08-31 · 4 min readHow to Get a Claude API Key (and How to Use It)
Step-by-step guide to getting a Claude API key from Anthropic, understanding pricing, making your first request, and keeping keys secure.
2026-08-31 · 5 min readTurn your Claude access into an HTTPS API
SubToAPI gives you application API keys, streaming, tool use and usage insights on top of your existing Claude access — set up in minutes.
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