beginner 5 min read
What Is API Pricing?
A beginner-friendly explanation of how AI API pricing works, including tokens, rate limits, and cost optimization.
Published Mar 1, 2026
Updated Mar 1, 2026
API Pricing Explained
When you use an AI tool through its API (rather than through the website), you typically pay per usage rather than a flat subscription fee. This is called API pricing.
What Are Tokens?
Most AI APIs charge per token — a unit of text roughly equal to 3/4 of a word. A 1,000-word document is approximately 1,333 tokens.
API providers charge separately for:
- Input tokens — the text you send to the AI
- Output tokens — the text the AI generates back (usually 2-5x more expensive)
Typical API Pricing Ranges
| Provider | Input (per 1M tokens) | Output (per 1M tokens) |
|---|---|---|
| Budget models | $0.10 - $0.50 | $0.25 - $1.50 |
| Standard models | $1 - $5 | $3 - $15 |
| Premium models | $10 - $30 | $30 - $75 |
Prices are approximate and change frequently. Check our tool pages for current pricing.
Rate Limits
APIs also impose rate limits — maximum requests per minute or tokens per day. Free tiers have lower limits; paid tiers offer higher throughput.
When Should You Use the API?
- Building an app that needs AI capabilities
- Processing large volumes of text automatically
- Custom workflows that can’t be done through the web interface
- Cost optimization — APIs are often cheaper than per-seat subscriptions for high-volume use
Cost Optimization Tips
- Use the smallest model that meets your quality needs
- Cache responses for repeated queries
- Batch requests to reduce overhead
- Set spending limits to prevent surprise bills
- Monitor usage daily during initial rollout