Your AI is confidently wrong 15% of the time

Check catches hallucinations before they reach your users. Seven verification methods, one API call. You pick the speed/accuracy tradeoff.

Get your API key

POST /v1/verify

Request

{
  "content": "Patient should take
    500mg aspirin daily",
  "methods": {
    "reasoning": 0.5,
    "tool": 0.3,
    "biprm": 0.2
  }
}

Response

{
  "verdict": false,
  "confidence": 0.94,
  "decision": "reject",
  "reasoning": "Dosage exceeds
    safe limits (max 325mg)"
}

847ms · $0.003 · Methods: reasoning + tool + biprm

Seven methods, one API

Each catches different errors. You weight them based on risk tolerance.

Fast

Thorough

Semantic

<15ms

~20-30% FPR

Entropy

<100ms

~8-10% FPR

Tool

1-2s

~1% FPR

Reasoning

2-5s

~4-5% FPR

BiPRM

2-3.5s

~5-7% FPR

Ensemble

5-12s

~15-20% FPR

Formal

Variable

0% FPR

FastThorough

Semantic

<15ms~20-30% FPR

Entropy

<100ms~8-10% FPR

Tool

1-2s~1% FPR

Reasoning

2-5s~4-5% FPR

BiPRM

2-3.5s~5-7% FPR

Ensemble

5-12s~15-20% FPR

Formal

Variable0% FPR

Most teams start with reasoning + tool — under 3 seconds, catches ~95% of errors. Add biprm or ensemble when accuracy is non-negotiable.

How it works

POST your AI output with method weights

curl -X POST https://api.checkapi.ai/v1/verify \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "content": "Patient should take 500mg aspirin daily",
    "methods": { "reasoning": 0.5, "tool": 0.3, "biprm": 0.2 }
  }'

Get back a verdict with confidence and reasoning

{
  "verdict": false,
  "confidence": 0.94,
  "decision": "reject",
  "reasoning": "Dosage exceeds safe limits (max 325mg)"
}

Route on the decision

if (result.decision === "reject")  blockResponse();
if (result.decision === "escalate") routeToHuman();
if (result.decision === "accept")   serve(result);

Full docs at /docs — Python, Node.js, and cURL.

Built by

Justin Tan

CEO

Drove $35M revenue solutions at Mastercard. Built $19M RFP bundles covering risk and compliance at West Monroe.

Michael Chen

CTO

AI Software Engineer at Epoch, building autonomous coding agents. Previously built $5M DOD-funded sensor systems with zero downtime.

We spent years building AI systems at production scale. The hardest part wasn't making AI smart—it was trusting its outputs.

Pricing

Bring your own API keys. You pay for verifications, not our margins.

Free

1,000 verifications/month
All 7 methods
20 requests/min
7-day data retention

Get API key

Pro

$99

/month

25,000 verifications/month
All 7 methods
200 requests/min
Batch processing
Up to 5 team members
30-day data retention

Enterprise

Custom

Unlimited verifications
All 7 methods
1,000 requests/min
Batch processing
Unlimited team members
90-day data retention

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