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Watch it decide · Ledger #288

daily-brief · MarketData+BriefComposer

published· conf ▰▰▰▰▰ 0.92· AUG 20, 2026, 9:00 PM· anthropic/claude-haiku-4.5· constitution v5

01

Inputs — what it was given

{}
02

Sources read — 5 cited

03

The gate — deterministic verdict

Decision: published · computed in 17885 ms

5/5 series, all sourced and fresh.

04

Outputs — what it produced

{
  "gate": {
    "pass": true,
    "reason": "5/5 series, all sourced and fresh.",
    "confidence": 0.92
  },
  "market": {
    "sources": [
      {
        "url": "https://fred.stlouisfed.org/series/MORTGAGE30US",
        "asOf": "2026-08-20",
        "name": "FRED · 30-Year Fixed Mortgage",
        "value": 6.65,
        "seriesId": "MORTGAGE30US"
      },
      {
        "url": "https://fred.stlouisfed.org/series/DGS10",
        "asOf": "2026-08-19",
        "name": "FRED · 10-Year Treasury",
        "value": 4.65,
        "seriesId": "DGS10"
      },
      {
        "url": "https://fred.stlouisfed.org/series/DGS2",
        "asOf": "2026-08-19",
        "name": "FRED · 2-Year Treasury",
        "value": 4.19,
        "seriesId": "DGS2"
      },
      {
        "url": "https://fred.stlouisfed.org/series/FEDFUNDS",
        "asOf": "2026-07-01",
        "name": "FRED · Fed Funds Rate",
        "value": 3.63,
        "seriesId": "FEDFUNDS"
      },
      {
        "url": "https://fred.stlouisfed.org/series/SP500",
        "asOf": "2026-08-19",
        "name": "FRED · S&P 500",
        "value": 7707.98,
        "seriesId": "SP500"
      }
    ],
    "readings": [
      {
        "asOf": "2026-08-20",
        "unit": "percent",
        "label": "30-Year Fixed Mortgage",
        "value": 6.65,
        "prevAsOf": "2026-08-13",
        "seriesId": "MORTGAGE30US",
        "prevValue": 6.67
      },
      {
        "asOf": "2026-08-19",
        "unit": "percent",
        "label": "10-Year Treasury",
        "value": 4.65,
        "prevAsOf": "2026-08-18",
        "seriesId": "DGS10",
        "prevValue": 4.71
      },
      {
        "asOf": "2026-08-19",
        "unit": "percent",
        "label": "2-Year Treasury",
        "value": 4.19,
        "prevAsOf": "2026-08-18",
        "seriesId": "DGS2",
        "prevValue": 4.19
      },
      {
        "asOf": "2026-07-01",
        "unit": "percent",
        "label": "Fed Funds Rate",
        "value": 3.63,
        "prevAsOf": "2026-06-01",
        "seriesId": "FEDFUNDS",
        "prevValue": 3.63
      },
      {
        "asOf": "2026-08-19",
        "unit": "index",
        "label": "S&P 500",
        "value": 7707.98,
        "prevAsOf": "2026-08-18",
        "seriesId": "SP500",
        "prevValue": 7691.76
      }
    ]
  },
  "briefId": 143,
  "composed": {
    "spec": {
      "root": {
        "kind": "Stack",
        "children": [
          {
            "cols": 3,
            "kind": "Grid",
            "children": [
              {
                "kind": "Stat",
                "label": "30-Year Fixed Mortgage",
                "value": "6.65%",
                "caption": "30-year fixed fell 2 bps to 6.65%, the smallest one-day move in this batch."
              },
              {
                "kind": "Stat",
                "label": "10-Year Treasury",
                "value": "4.65%",
                "caption": "10-year Treasury dropped 6 bps to 4.65%, driving the larger long-end repricing."
              },
              {
                "kind": "Stat",
                "label": "2-Year Treasury",
                "value": "4.19%",
                "caption": "2-year held flat at 4.19%, showing near-term rate expectations stable."
              },
              {
                "kind": "Stat",
                "label": "Fed Funds Rate",
                "value": "3.63%"
              },
              {
                "kind": "Stat",
                "label": "S&P 500",
                "value": "7,707.98",
                "caption": "S&P 500 at 7,707.98 (as of 2026-08-19), equity strength supporting demand backdrop."
              }
            ]
          },
          {
            "kind": "Text",
            "text": "What it means for your shop",
            "emphasis": "mono"
          },
          {
            "kind": "Callout",
            "text": "The 200 bp spread between 30-year mortgages and 10-year Treasuries gives originators breathing room on volume, but the 46 bp 10–2 curve flattening signals rate-sensitive refi demand remains muted; near-term MSR prepay risk stays modest.",
            "tone": "info"
          }
        ]
      },
      "title": "markets & rates"
    },
    "label": "autonomous · AI-generated",
    "usage": {
      "promptTokens": 1988,
      "completionTokens": 310
    },
    "summary": "Long-end yields retreated while the 30-year mortgage rate edged lower, pushing the origination-rate premium to 200 bps—a structurally wide cushion for lenders.",
    "headline": "Mortgage Spread Widens as Treasuries Fall; 10–2 Curve Flattens to 46 bps",
    "disclaimer": "Not financial advice. Generated autonomously from public Federal Reserve data."
  },
  "artifactId": 145
}
05

Proof — the hash-chained record

seq #288
row_hash 5fc3215e9362789573a113fe7537c8bdf9431b5b6695cd9672a1e72390db337d
prev_hash 872da23becabe94b0244f03bfc3f17a37d1eae5df29a2975277d89a32364b9e7

This exact row, with its canonical preimage, is public at /api/ledger/export. Recompute its hash with the standalone verifier — it shares no code with this site. The chain head is timestamped into Bitcoin.

Evidence or it doesn't ship.