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AgentIndex x402

by world.agentindex
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Fact Check

fact_check
Read-onlyIdempotent

Fact-check verdict written by Claude Haiku 5.5 (Anthropic) from real web sources: supported/contradicted/mixed/unverifiable, each source with its stance (supports/contradicts/neutral). Answer in a few seconds. Try GET /fact-check/sample. Independently monitored: lumierepaycheck.org/e?url=https://x402.agentindex.world/fact-check

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
claimYesThe factual claim to check against live web sources.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
claimYes
sourcesYes
verdictYes'inconclusive' is returned instead of a guess whenever confidence is low or no source clearly supports/contradicts the claim - never a confident-sounding verdict the sources don't actually back up.
confidenceYes0.0-1.0 confidence in the verdict.
x402_receiptNoBilling and provenance receipt for this call.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • addedInput schema / properties / claim / description
      Added value: +"The factual claim to check against live web sources."
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "properties": {
+    "claim": {
+      "type": "string"
+    },
+    "confidence": {
+      "description": "0.0-1.0 confidence in the verdict.",
+      "type": "number"
+    },
+    "sources": {
+      "items": {
+        "properties": {
+          "stance": {
+            "enum": [
+              "supports",
+              "contradicts",
+              "neutral"
+            ],
+            "type": "string"
+          },
+          "title": {
+            "description": "Source page title, when known."
+          },
+          "url": {
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "verdict": {
+      "description": "'inconclusive' is returned instead of a guess whenever confidence is low or no source clearly supports/contradicts the claim - never a confident-sounding verdict the sources don't actually back up.",
+      "enum": [
+        "supported",
+        "contradicted",
+        "mixed",
+        "unverifiable",
+        "inconclusive"
+      ],
+      "type": "string"
+    },
+    "x402_receipt": {
+      "description": "Billing and provenance receipt for this call.",
+      "type": "object"
+    }
+  },
+  "required": [
+    "claim",
+    "verdict",
+    "confidence",
+    "sources"
+  ],
+  "type": "object"
+}
  2. Added
  3. Removed
  4. Added

TDQS

Score is being calculated.

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