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Submit one claim at a time

The API verifies a single claim per request. For multiple claims, send them as separate requests. 
# Good — one specific claim
{"claim": "The global average temperature has risen by 1.1°C since pre-industrial times."}

# Avoid — multiple claims in one request
{"claim": "Temperature has risen 1.1°C and CO2 levels are at record highs."}

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Be specific and factual

Vague or opinionated statements produce lower confidence scores. Frame the claim as a concrete, verifiable statement. 
# Good — specific and verifiable
{"claim": "Apple became the first US company to reach a $3 trillion market cap in 2022."}

# Avoid — too vague
{"claim": "Apple is very successful."}

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Use confidence score as a filter

A confidence below 0.5 means the evidence is insufficient. Consider surfacing these to users as UNCERTAIN rather than acting on the verdict. 
{
  "verdict": "TRUE",
  "confidence": 0.3  // treat this as UNCERTAIN regardless of verdict
}

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Combine with Evidence Finder

After receiving a verdict, use Evidence Finder to surface the sources behind it. 
Fact Checker → verdict → Evidence Finder (for supporting sources)