generated: '2026-09-19'
method: probed
source: https://agent-economy.kgninja.dev/agent.json
docs:
- https://agent-economy.kgninja.dev/llms.txt
- https://agent-economy.kgninja.dev/index.md
- https://agent-economy.kgninja.dev/faq
- https://agent-economy.kgninja.dev/.well-known/x402
- https://agent-economy.kgninja.dev/stats
plan_count: 1
currency: USDC
model: pay-per-call in USDC on Base via x402 v2; no subscription, no account, no card payments, no tiers
prices_published: true
public_signup_pricing: true
summary: >-
  KG-NINJA publishes exactly one price, machine-readably in four places that agree: 10000 atomic USDC
  (0.01 USDC, 6 decimals) per paid verification, settled by x402 on Base (eip155:8453) to
  0x4D7d842536De9Eb491AE2300126B3CDdE7B0aDE3 in asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The
  agent manifest payment block, the x402 manifest's accepts[] (amount "10000"), the OpenAPI
  X402PaymentRequirement schema (amount const "10000") and the canonical offer returned by
  /validate-request and the MCP describe tool (display_amount "0.01 USDC") all carry the same number, and
  the landing page's schema.org Offer says price 0.01 USDC. Everything except execution is free. The FAQ
  notes the price is "published by the free quote endpoint and x402 challenge" and that "the production
  default is 10,000 atomic USDC" — the quote is authoritative per call and the precheck reads a runtime
  price with a configured fallback, so a client should read the quote rather than hard-code the number.
plans:
- id: verify-evidence
  name: Deterministic evidence verification (verify_evidence)
  price: 0.01
  price_atomic: '10000'
  currency: USDC
  decimals: 6
  period: per call (one verification of up to 16 assertions over up to 65,536 bytes of JSON)
  payment: x402 v2 exact; network eip155:8453; maxTimeoutSeconds 300
  included: >-
    Free: discovery documents, documentation, health, stats, revenue-goal status, the precheck (POST
    /validate-request), the quote (POST /quote), MCP tools/list and the four free MCP tools
    (describe_verify_evidence, get_revenue_goal_status, quote_verify_evidence,
    prepare_verify_evidence_purchase), the A2A quote-preparation skill, and optional anonymous registration.
  overage: null
  limits: ['decoded evidence <= 65,536 bytes', 'content_base64 <= 87,384 chars', '1-16 assertions', 'evidence media type application/json only', 'four assertion operators: sha256_equals, json_pointer_exists, json_pointer_equals, json_type_is']
  economic_guard: 'A quote is issued only when "a conservative variable-cost upper bound leaves the configured minimum contribution margin"; QuoteResponse.economic_guard carries the decision and contribution_margin_lower_bound_microusd, and DeliveryReceipt reports price_paid_microusd, variable_cost_upper_bound_microusd and contribution_margin_lower_bound_microusd back to the buyer.'
  networks_declared: [eip155:8453, eip155:84532]
  networks_served: [eip155:8453]
  network_note: 'eip155:84532 (Base Sepolia) is enumerated in the Price, VerificationSpendPolicy and X402PaymentRequirement schemas; the served x402 manifest and canonical offer name eip155:8453 only, and mockMode / simulation are false.'
  activity_observed: 'stats on 2026-09-20: delivered_transactions 1, settled_revenue_atomic "10000", latest_delivery_at 2026-09-14.'
free_tier:
  everything_but_execution: true
  registration_required: false
  note: 'auth.md: "Free discovery, documentation, health, aggregate statistics, revenue-goal status, quotes, MCP tools/list, and the four free MCP tools can be called without credentials."'
x-canonical:
  generated: '2026-10-08'
  vocabulary: all/0-working/economics/plans-canonical.yml
  models:
  - subscription
  units: []
  plans:
  - name: Deterministic evidence verification (verify_evidence)
    access: other
    model: subscription
    model_how: derived
    units: []
    periods:
    - other