Use lightweight ticker APIs for liquidity rank to cut memory.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_hub_volume_rank_lib.py

@@ -1,14 +1,20 @@
 from datetime import datetime
+from unittest.mock import MagicMock
 
 from hub_volume_rank_lib import (
     CACHE_VERSION,
+    LIQUIDITY_RANK_CACHE_VERSION,
     TOP_N_DEFAULT,
     _exchange_rank_row_stale,
     _okx_turnover_usdt,
+    _scores_from_binance,
+    _scores_from_gate,
+    build_usdt_swap_volume_ranks,
     cache_needs_refresh,
     format_volume_quote,
     merge_exchange_rank,
     rank_date_label,
+    resolve_daily_volume_rank,
 )
 
 
@@ -63,3 +69,73 @@ def test_short_item_list_is_stale():
     assert _exchange_rank_row_stale(row) is True
     full = {"items": items + [{"rank": i, "symbol": f"X{i}/USDT"} for i in range(13, TOP_N_DEFAULT + 1)], "total_symbols": 300}
     assert _exchange_rank_row_stale(full) is False
+
+
+def test_scores_from_binance_uses_fapi_lightweight_api():
+    ex = MagicMock()
+    ex.id = "binance"
+    ex.fapiPublicGetTicker24hr.return_value = [
+        {"symbol": "BTCUSDT", "quoteVolume": "9000000"},
+        {"symbol": "ETHUSDT", "quoteVolume": "5000000"},
+    ]
+    scored = _scores_from_binance(ex)
+    assert scored[0][1] == "BTC"
+    assert scored[0][2] == 9000000.0
+    ex.fetch_tickers.assert_not_called()
+
+
+def test_scores_from_gate_uses_futures_tickers_api():
+    ex = MagicMock()
+    ex.id = "gateio"
+    ex.publicFuturesGetSettleTickers.return_value = [
+        {"contract": "BTC_USDT", "volume_24h_quote": "8000000"},
+        {"contract": "ETH_USDT", "volume_24h_quote": "4000000"},
+    ]
+    scored = _scores_from_gate(ex)
+    assert scored[0][1] == "BTC"
+    ex.fetch_tickers.assert_not_called()
+
+
+def test_resolve_daily_volume_rank_caches_result():
+    cache = {"version": 0, "updated_at": 0.0, "ranks": {}, "total": 0}
+    ex = MagicMock()
+    ex.id = "binance"
+    ex.fapiPublicGetTicker24hr.return_value = [
+        {"symbol": "BTCUSDT", "quoteVolume": "100"},
+        {"symbol": "ETHUSDT", "quoteVolume": "50"},
+    ]
+
+    rank, total = resolve_daily_volume_rank(
+        "BTC",
+        cache,
+        now_ts=1000.0,
+        ttl_sec=60.0,
+        exchange=ex,
+        ensure_markets_loaded=lambda: None,
+    )
+    assert rank == 1
+    assert total == 2
+    assert cache["version"] == LIQUIDITY_RANK_CACHE_VERSION
+    calls = ex.fapiPublicGetTicker24hr.call_count
+
+    rank2, _ = resolve_daily_volume_rank(
+        "BTC",
+        cache,
+        now_ts=1010.0,
+        ttl_sec=60.0,
+        exchange=ex,
+        ensure_markets_loaded=lambda: None,
+    )
+    assert rank2 == 1
+    assert ex.fapiPublicGetTicker24hr.call_count == calls
+
+
+def test_build_usdt_swap_volume_ranks():
+    ex = MagicMock()
+    ex.id = "binance"
+    ex.fapiPublicGetTicker24hr.return_value = [
+        {"symbol": "SOLUSDT", "quoteVolume": "200"},
+    ]
+    ranks, total = build_usdt_swap_volume_ranks(ex, lambda: None)
+    assert ranks["SOL"] == 1
+    assert total == 1