diff --git a/src/services/ledgerService.js b/src/services/ledgerService.js
index 5d67316..adca9b6 100644
--- a/src/services/ledgerService.js
+++ b/src/services/ledgerService.js
@@ -315,17 +315,27 @@ async function attachClosingProb(sport, opts = {}) {
   if (error) return { updated: 0, error: error.message };
   if (!rows || !rows.length) return { updated: 0, absent: 0 };
 
+  // closing_captures deliberately stores BOTH RAW SIDE PRICES rather than a
+  // probability (Session 64), so the de-vig runs here — the same devigTwoWay
+  // the grade-time fair price uses, which is what makes lock and close
+  // comparable at all. Asking this table for a `fair_prob` column is a bug: it
+  // has none, and every row then looks closeless.
+  const { devigTwoWay } = require('../utils/devig');
   const { data: caps } = await sb.from('closing_captures')
-    .select('player_key, stat, side, game_date, fair_prob, captured_at, missed_reason')
+    .select('player_key, stat, side, game_date, over_odds, under_odds, captured_at, missed_reason')
     .eq('sport', sp).limit(50000);
 
   // Latest usable capture per identity = the TRUE close.
   const best = new Map();
   for (const c of caps || []) {
-    if (c.missed_reason || c.fair_prob == null) continue;
+    if (c.missed_reason) continue;
+    const dv = devigTwoWay(c.over_odds, c.under_odds);
+    const leg = dv && dv[String(c.side).toLowerCase() === 'under' ? 'under' : 'over'];
+    const fp = leg && Number.isFinite(leg.fair_prob) ? leg.fair_prob : null;
+    if (fp == null) continue; // one-sided or unusable → not a close
     const k = `${c.player_key}|${c.stat}|${c.side}|${c.game_date}`;
     const prev = best.get(k);
-    if (!prev || String(c.captured_at) > String(prev.captured_at)) best.set(k, c);
+    if (!prev || String(c.captured_at) > String(prev.captured_at)) best.set(k, { ...c, fair_prob: fp });
   }
 
   let updated = 0; let absent = 0;
diff --git a/tests/unit/projectionInstrument.test.js b/tests/unit/projectionInstrument.test.js
index bf2bad8..11114af 100644
--- a/tests/unit/projectionInstrument.test.js
+++ b/tests/unit/projectionInstrument.test.js
@@ -86,23 +86,28 @@ describe('attachClosingProb — the market half', () => {
   };
   const ROW = { id: 'r1', player_key: 'josh bell', stat: 'hits', side: 'over', game_date: '2026-07-20' };
 
-  it('writes the LATEST usable capture as the true close', async () => {
+  it('DE-VIGS the raw both-side close prices (the table stores no probability)', async () => {
+    // closing_captures deliberately stores over_odds/under_odds, NOT a
+    // probability. Selecting a `fair_prob` column from it returns nothing and
+    // makes every row look closeless — that shipped once and marked rows
+    // market-unavailable without ever reading a capture.
     const sb = makeSb({
       rows: [ROW],
       caps: [
-        { player_key: 'josh bell', stat: 'hits', side: 'over', game_date: '2026-07-20', fair_prob: 0.60, captured_at: '2026-07-20T20:00:00Z' },
-        { player_key: 'josh bell', stat: 'hits', side: 'over', game_date: '2026-07-20', fair_prob: 0.64, captured_at: '2026-07-20T22:50:00Z' },
+        { player_key: 'josh bell', stat: 'hits', side: 'over', game_date: '2026-07-20', over_odds: -150, under_odds: 120, captured_at: '2026-07-20T20:00:00Z' },
+        { player_key: 'josh bell', stat: 'hits', side: 'over', game_date: '2026-07-20', over_odds: -210, under_odds: 170, captured_at: '2026-07-20T22:50:00Z' },
       ],
     });
     const out = await ledger.attachClosingProb('mlb', { sb, beforeDate: '2026-07-21' });
     expect(out.updated).toBe(1);
-    expect(sb.updates[0].patch.closing_prob).toBe(0.64); // the later one
+    // The LATER capture is the true close, de-vigged from -210/+170.
+    expect(sb.updates[0].patch.closing_prob).toBe(0.647);
   });
 
   it('IGNORES refused captures — a missed_reason is not a close', async () => {
     const sb = makeSb({
       rows: [ROW],
-      caps: [{ player_key: 'josh bell', stat: 'hits', side: 'over', game_date: '2026-07-20', fair_prob: 0.7, captured_at: 'x', missed_reason: 'one_sided_price' }],
+      caps: [{ player_key: 'josh bell', stat: 'hits', side: 'over', game_date: '2026-07-20', over_odds: -210, under_odds: 170, captured_at: 'x', missed_reason: 'one_sided_price' }],
     });
     const out = await ledger.attachClosingProb('mlb', { sb, beforeDate: '2026-07-21' });
     expect(out.updated).toBe(0);
@@ -124,6 +129,22 @@ describe('attachClosingProb — the market half', () => {
     expect(out.updated).toBe(0);
   });
 
+  it('a one-sided capture is NOT a close (de-vig needs both sides)', async () => {
+    const sb = makeSb({
+      rows: [ROW],
+      caps: [{ player_key: 'josh bell', stat: 'hits', side: 'over', game_date: '2026-07-20', over_odds: -210, under_odds: null, captured_at: 'x' }],
+    });
+    await ledger.attachClosingProb('mlb', { sb, beforeDate: '2026-07-21' });
+    expect(sb.updates[0].patch.market_unavailable_reason).toBe('no_usable_close');
+  });
+
+  it('never asks closing_captures for a column it does not have', () => {
+    const src = require('fs').readFileSync(require.resolve('../../src/services/ledgerService'), 'utf8');
+    const fn = src.slice(src.indexOf('async function attachClosingProb'));
+    expect(fn).toMatch(/from\('closing_captures'\)[\s\S]{0,200}over_odds, under_odds/);
+    expect(fn).not.toMatch(/closing_captures'\)[\s\S]{0,200}fair_prob,/);
+  });
+
   it('only considers rows that have no close yet (write-once)', () => {
     const src = require('fs').readFileSync(require.resolve('../../src/services/ledgerService'), 'utf8');
     const fn = src.slice(src.indexOf('async function attachClosingProb'));