AXIMUR Claim Verification API

Evidence-bounded claim verification for RAG and AI-agent workflows.

The Problem

AI agents and RAG systems hallucinate. They confidently state false claims as fact. Retrieval-augmented generation helps, but retrieval is not verification — retrieved passages may be irrelevant, outdated, or contradict the claim entirely. AXIMUR closes the gap: it evaluates whether a claim is actually supported by the evidence you provide.

How It Works

Input: A claim + a grounding source (text, document, or retrieved passages).
Output: A structured verdict — SUPPORTED, UNSUPPORTED, or UNCERTAIN — with confidence score, step-by-step reasoning, and a full audit trail citing the exact evidence spans.

You supply the grounding source. AXIMUR does not search the web. It does not query a knowledge base. It evaluates the claim only against the evidence you provide. This is evidence-bounded verification — not open-web fact-checking.

Security Note: API keys must be kept server-side. Never expose API keys in client-side code, mobile apps, or public repositories.

Endpoint

POST https://api.aximur.com/v1/verify

Header	Required	Value
`Authorization`	Yes	`Bearer YOUR_API_KEY`
`Content-Type`	Yes	`application/json`

Request Body

{
  "claim": "The global average temperature in 2023 was 1.45°C above pre-industrial levels.",
  "grounding_source": "According to the WMO State of the Global Climate 2023 report, the global average temperature in 2023 was 1.45°C above the pre-industrial baseline (1850–1900)."
}

Response

{
  "verdict": "SUPPORTED",
  "confidence": 0.96,
  "reasoning": "The claim matches the WMO report's stated figure of 1.45°C above pre-industrial levels (1850–1900 baseline). The grounding source directly supports the specific figure and baseline.",
  "audit_trail": [
    {
      "claim_span": "global average temperature in 2023 was 1.45°C above pre-industrial levels",
      "source_span": "global average temperature in 2023 was 1.45°C above the pre-industrial baseline (1850–1900)",
      "match_type": "exact_match"
    }
  ]
}

Start API Access — $49/mo

Verdicts

Verdict	Meaning
`SUPPORTED`	The grounding source directly supports the claim.
`UNSUPPORTED`	The grounding source contradicts the claim or explicitly refutes it.
`UNCERTAIN`	The grounding source is insufficient, ambiguous, or does not address the claim.

Each verdict includes a confidence score (0.0–1.0) and a detailed reasoning trace with an audit trail linking claim spans to source spans.

Quickstart (cURL)

curl -X POST https://api.aximur.com/v1/verify \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "claim": "The global average temperature in 2023 was 1.45°C above pre-industrial levels.",
    "grounding_source": "According to the WMO State of the Global Climate 2023 report, the global average temperature in 2023 was 1.45°C above the pre-industrial baseline (1850–1900)."
  }'

Documentation

Start API Access — $49/mo

Website & Support

Website: https://aximur.com
Contact: contact@aximur.com
API Base URL: https://api.aximur.com/v1

Brand

AXIMUR / AXIMUR Security
contact@aximur.com
https://aximur.com