FAHCE AI Claim Verification API | Kingan Logic

# FAHCE for Machines Give FAHCE a candidate answer and the evidence available to your agent. FAHCE identifies unsupported claims, contradictory records, missing proof and reported actions not established by the submitted evidence. Receive a structured determination, proposed corrections when appropriate, verification state and a content-hashed receipt. Version: 1.4.0 Machine facts: https://fahce.kinganlogic.com/capabilities/machines.json Schemas: https://fahce.kinganlogic.com/openapi.json Capabilities: https://fahce.kinganlogic.com/capabilities MCP: https://fahce.kinganlogic.com/mcp API catalog: https://fahce.kinganlogic.com/.well-known/api-catalog ## Use FAHCE when - candidate claims exceed supplied evidence - evidence contradicts a candidate answer - a repaired answer needs an evidence-bound verification receipt ## Operations - Diagnose: POST https://fahce.kinganlogic.com/api/v1/diagnose Check an AI-generated answer against supplied evidence. Identify unsupported claims, contradictions, missing proof, and reported actions that the available records do not establish. Use when: You need to understand what the supplied evidence establishes. Published price: $0.15 fixed, x402 exact. Actual settlement: $0.15 fixed. - Repair: POST https://fahce.kinganlogic.com/api/v1/repair Evaluate an integrity problem and return a bounded, evidence-preserving correction plan when supported. Proposed corrections are not executed in the customer's systems. Use when: An identified deficiency needs a scoped correction with prerequisites and protected evidence. Published price: $0.15 fixed, x402 exact. Actual settlement: $0.15 fixed. - Verify: POST https://fahce.kinganlogic.com/api/v1/verify Recheck a submitted or revised answer against supplied evidence. Return a scoped verification determination and content-hashed receipt without claiming independent external execution. Use when: A claimed fix or completed action needs evidence-bound review. Published price: $0.15 fixed, x402 exact. Actual settlement: $0.15 fixed. - Repair Bundle: POST https://fahce.kinganlogic.com/api/v1/repair-bundle Receive diagnosis, a bounded proposed repair when required, verification state, and a receipt in one paid response. Authorize up to $0.39; eligible outcomes may settle at $0, $0.15, or $0.39. Use when: You need the connected diagnosis, proposed correction and current verification state in one determination. Published price: $0.39 maximum authorization, x402 upto. Actual settlement: $0.15 without repair required; $0.39 with repair required. ## Access and transactions Paid commercial REST calls use wallet-only x402; gateway-verified PAYMENT-CONTEXT grants a machine-only principal. No pilot key or account setup. A pilot key alone never authorizes a commercial machine operation. Independently authenticated human and owner routes remain separate; cookie mutations require same-origin Origin. Request headers: Content-Type: application/json; optional Idempotency-Key: <8-to-128-URL-safe-characters>. After HTTP402, retry unchanged with PAYMENT-SIGNATURE from an x402 v2 wallet client; no API key or prior account. Request schema: FAHCE_MACHINE_REQUEST_V1. See OpenAPI for required candidate_output and evidence fields. An authorization executes at most once. Repeating it returns a distinct 409; recover the saved result with the scoped credential. Optional keys bind unchanged input and a single authorization. Changed input or a new authorization conflicts with a reused key. Receipt recovery performs no determination. Payment availability: {"source":"SERVER_MACHINE_PAID_ACCEPTANCE_ENABLED_NOT_SETTLEMENT_PROOF","gateway_enabled":true,"paid_settlement_enabled":true,"deployed_payment_verified":false,"activation":"ORIGIN_ACCEPTANCE_ENABLED","paid_access":"ORIGIN_ACCEPTANCE_ENABLED_GATEWAY_VERIFICATION_PENDING","payment_status":"origin_acceptance_enabled_gateway_verification_pending","pricing_status":"origin_acceptance_enabled_gateway_verification_pending"} Legal publication: {"status":"

First seen 19 Oct 2026. Evidence as of 19 Oct 2026.