The same engine. Your stack.

Pricing (locked)

• probe0.5 USDGDaily stress + V5 attestation (Check)
• clock5 USDGWatch/Act clock + gap bands
• full8 USDGClock + OKX BTC derivatives stress

Strike zone: Base / Avalanche probe at $0.25 USDC on unpaid probe when dual-rail is enabled — enter polling loops beside mall comps; clock and full stay premium.

Machine discovery

• /llms.txt — agent-readable index
• /.well-known/x402.json — x402 catalog stub
• /.well-known/regime-gate-mcp.json — MCP tool schema (get_regime_clock)
• /api/v1/x402/status — honest readiness + catalog counts

Example 200 response

pulse is a daily stress band (easing, stable, elevated, critical) - not the thermodynamic phase label on entity score runs. nii_anchor is read from the latest monthly_scores row (example below: July 2026 canonical nii_score 3.37); level is the global monthly NII scalar (engine 0–5; display ×20 → 0–100), distinct from per-entity phase on keyed entity reads (see field_notes). Driver buckets in this example are illustrative; nii_anchor matches the live ledger month.

{
  "as_of": "2026-07-07T12:00:00.000Z",
  "data_through": "2026-07-06",
  "pulse": "elevated",
  "drift": 12.5,
  "drivers": [
    "event_pressure",
    "attention"
  ],
  "domain_detail": {
    "event_pressure": 60,
    "cyber_activity": 60,
    "macro_spillover": 50,
    "attention": 60
  },
  "nii_anchor": {
    "level": 3.37,
    "as_of": "2026-07-01",
    "next_update": "2026-08-01T08:00:00.000Z"
  },
  "stale_sources": [],
  "note": "Risk context, not trade signals.",
  "attestation": {
    "edition": "v5-locked-1.19.0",
    "physics_base": "v5-strong-1.0.0",
    "physics_hash": "4cdadbc69e551295aad8f10f52cb96b1679c3506f748394597bb85eaf9056689",
    "engine_path": "v5_locked_pit"
  },
  "tier_crumbs": {
    "currentDepth": "probe",
    "upgrades": [
      {
        "depth": "clock",
        "url": "https://www.entropyindex.com/api/v1/risk/global-financial-system?depth=clock",
        "priceUsdg": "5",
        "trigger": "pulse_elevated",
        "reason": "Daily pulse elevated — upgrade to clock before notional increase.",
        "upgradeNow": true
      }
    ],
    "ladder": [
      {
        "depth": "probe",
        "url": "https://www.entropyindex.com/api/v1/risk/global-financial-system?depth=probe",
        "priceUsdg": "0.5",
        "role": "Poll loop — daily stress band + physics hash"
      },
      {
        "depth": "clock",
        "url": "https://www.entropyindex.com/api/v1/risk/global-financial-system?depth=clock",
        "priceUsdg": "5",
        "role": "Pre-size gate — Watch/Act + attestation"
      },
      {
        "depth": "full",
        "url": "https://www.entropyindex.com/api/v1/risk/global-financial-system?depth=full",
        "priceUsdg": "8",
        "role": "Clock + OKX BTC derivatives fusion"
      }
    ]
  },
  "citation": {
    "oneLine": "Global Financial System (probe) as of 2026-07-07 — physics 4cdadbc69e55… Pulse elevated. Our Index registered Crisis by March 2008 — 6 months before Lehman.",
    "entity": "Global Financial System",
    "depth": "probe",
    "asOf": "2026-07-07T12:00:00.000Z",
    "physicsHash": "4cdadbc69e551295aad8f10f52cb96b1679c3506f748394597bb85eaf9056689",
    "attestationEdition": "v5-locked-1.19.0",
    "proofLead": "Our Index registered Crisis by March 2008 — 6 months before Lehman.",
    "note": "Risk context, not trade signals."
  }
}

Error responses

402 Payment Required - no valid payment header, or payment verification failed. Body carries x402 payment instructions (retry after signing).

{
  "x402Version": 2,
  "resource": {
    "url": "https://www.entropyindex.com/api/v1/pulse",
    "description": "Entropy Index Risk Pulse snapshot",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:196",
      "asset": "0x4ae46a509f6b1d9056937ba4500cb143933d2dc8",
      "amount": "500000",
      "payTo": "0x742d35cc6634c0532925a3b844bc9e4438f44e00",
      "maxTimeoutSeconds": 300,
      "extra": {
        "decimals": 6,
        "name": "USDG",
        "version": "2"
      }
    }
  ]
}

503 Service Unavailable - payment rail misconfigured (missing or malformed pay-to address, facilitator credentials unavailable, or settlement did not complete synchronously).

{
  "error": "Payment service unavailable"
}