Faithfulness scoring for RAG · ships on RapidAPI

Catch hallucinations before users do.

A dead-simple REST API: send an answer and its sources, get a 0–1 grounding score and a per-claim verdict — supported, partial, unsupported, or contradicted.

Subscribe on RapidAPI OpenAPI spec

Why

One call, one score

POST an answer + sources. No SDK, no model hosting, no Python lock-in.

Per-claim breakdown

Every sentence labeled and linked to the source that supports (or refutes) it.

RAG guardrail

Gate responses below your threshold before they reach users.

Pluggable accuracy

Deterministic heuristic by default; flip on an LLM judge when you need more.

Quick start

POST /v1/ground
{
  "answer": "Paris is the capital of France, population 12 million.",
  "sources": ["Paris is the capital of France. About 2.1 million live there."]
}

-> { "grounding_score": 0.62, "supported": false,
     "claims": [{ "status": "partial", "score": 0.62, "source_idx": 0 }] }

Plans

Tier	Payload/call	Claims/call
Basic	50 KB	50
Pro	300 KB	300
Ultra / Mega	1 MB	1000

Call quotas and billing are managed by RapidAPI.