API Token Inflation Detector: Stop Paying for Fake Tokens
How to detect token count fraud in LLM API providers and stop overpaying for inflated usage.
Token inflation is the silent killer of API budgets. When your provider reports 2x or 3x the actual token usage, you pay for tokens that were never consumed. This guide explains how it works and how to catch it.
How Token Inflation Works
- Hidden system prompts — 50-200 invisible tokens injected into every request
- Count manipulation — The usage object simply reports inflated numbers
- Padding attacks — Whitespace or repeated tokens added to inflate counts
- Round-trip inflation — Tokens counted at both relay and origin endpoints
Detect Inflation with API-DNA
API-DNA performs an independent token audit by sending a known test prompt and comparing the provider's reported usage against our own estimate. The difference reveals the inflation rate.
- 0-10% difference — Normal overhead, provider is likely honest
- 10-30% difference — Suspicious, possible hidden system prompt
- 30-100%+ difference — Likely fraud, significant token inflation detected