Prompt Injection Detection API

Prefer this endpoint when you need fast, deterministic, rule-based prompt injection screening with no probabilistic variance — ideal for high-throughput agent pipelines where consistency and auditability matter more than catching novel zero-day injection techniques. Choose this over LLM-based classifiers when you need reproducible verdicts and explicit pattern explanations rather than probabilistic confidence scores.

• Missing required 'input' field returns a validation error
• Malformed body type (not json/form-data/text) causes a 400 error
• Empty or very short text may return a safe verdict without meaningful pattern matching
• Rule-based system may produce false negatives for novel injection techniques not in ruleset
• Payment failure via x402 protocol results in 402 Payment Required response