{
  "format": "delx/intent-card/v1",
  "id": "idempotency-fingerprint-api",
  "intent": "Idempotency Fingerprint for an agent workflow",
  "title": "Idempotency Fingerprint API for agents",
  "description": "Create a stable SHA-256 idempotency fingerprint from a scope and canonical payload without storing state — call when writing a ledger or workflow event that must not double-apply. Use before side effects when composing multi-step agent jobs—the same loyalty/workflow demand band agents already pay for on Bazaar, but fully local. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, and no claim of live chain tip, web search, or media generation. Results are advisory; the caller owns authorization and production controls.",
  "keywords": [
    "Idempotency Fingerprint API",
    "Idempotency Fingerprint for agents",
    "pay per result API",
    "x402 API",
    "no API key"
  ],
  "updated_at": "2026-08-06",
  "canonical_url": "https://commerce.delx.ai/intents/idempotency-fingerprint-api",
  "machine_url": "https://commerce.delx.ai/intents/idempotency-fingerprint-api.json",
  "recommendation": {
    "tool_name": "util_idempotency_fingerprint",
    "service_name": "Delx Idempotency Fingerprint",
    "method": "POST",
    "resource": "https://api.delx.ai/api/v1/x402/idempotency-fingerprint",
    "price_usdc": "0.003",
    "payment_protocols": [
      "x402",
      "mpp"
    ],
    "input_schema": {
      "type": "object",
      "properties": {
        "payload": {
          "description": "JSON payload to fingerprint; values are hashed, not retained.",
          "type": "object"
        },
        "scope": {
          "description": "Caller-owned namespace string mixed into the fingerprint.",
          "type": "string"
        }
      },
      "required": [
        "payload"
      ],
      "additionalProperties": true
    },
    "example_input": {
      "payload": {
        "event": "credit",
        "amount": 10
      },
      "scope": "loyalty"
    },
    "example_output": {
      "schema": "delx/util-idempotency-fingerprint/v1",
      "algorithm": "sha256",
      "scope": "loyalty",
      "fingerprint": "dc22b29600e074df71fc0f9b0260185e822b228cca615d37992a31dc14eb8f45",
      "values_returned": false
    },
    "agentcash": {
      "buy": "npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/idempotency-fingerprint -m POST -H 'x-delx-source: intent-card-idempotency-fingerprint-api' --max-amount 0.003 -b '{\"payload\":{\"event\":\"credit\",\"amount\":10},\"scope\":\"loyalty\"}'",
      "max_amount_usdc": "0.003"
    }
  },
  "attribution": {
    "header": "x-delx-source",
    "value": "intent-card-idempotency-fingerprint-api"
  },
  "evidence": {
    "paid_openapi": "https://api.delx.ai/openapi.x402.json",
    "governed_portfolio": "https://api.delx.ai/x402-portfolio.json",
    "live_contract": "https://api.delx.ai/api/v1/x402/idempotency-fingerprint"
  }
}