diff --git a/diagnostic/build-2b54872c.json b/diagnostic/build-2b54872c.json
new file mode 100644
index 00000000..84a30192
--- /dev/null
+++ b/diagnostic/build-2b54872c.json
@@ -0,0 +1,86 @@
+{
+  "generated_at": "2026-06-22T05:06:42.079395+00:00",
+  "commit": "2b54872c",
+  "diagnostic_logd": null,
+  "diagnostic_logd_error": "bc664e44bba11102c467",
+  "chunked": false,
+  "chunk_size_bytes": null,
+  "password": null,
+  "decrypt_command": null,
+  "total_modules": 10,
+  "passed": 2,
+  "failed": 8,
+  "modules": [
+    {
+      "name": "backend",
+      "status": "FAIL",
+      "elapsed_seconds": 0,
+      "artifact": null,
+      "output": "Command not found: [Errno 2] No such file or directory: 'cargo'"
+    },
+    {
+      "name": "frontend",
+      "status": "PASS",
+      "elapsed_seconds": 1.692,
+      "artifact": "/Users/qingfeng/Desktop/\u81ea\u52a8\u642c\u7816/zeroeye-9904099-parse-errors/frontend/dist",
+      "output": "> tent-frontend@0.0.0 build\n> tsc -b && vite build\n\nvite v6.4.3 building for production...\ntransforming...\n\u2713 100 modules transformed.\nrendering chunks...\ncomputing gzip size...\ndist/index.html                   0.62 kB \u2502 gzip:  0.34 kB\ndist/assets/state-BkjSKDbY.js     8.91 kB \u2502 gzip:  3.55 kB \u2502 map:    57.15 kB\ndist/assets/vendor-CREcWLHI.js   48.93 kB \u2502 gzip: 17.22 kB \u2502 map:   481.27 kB\ndist/assets/index-CyxcoTyU.js   231.32 kB \u2502 gzip: 72.02 kB \u2502 map: 1,044.42 kB\n\u2713 built in 516ms"
+    },
+    {
+      "name": "market",
+      "status": "FAIL",
+      "elapsed_seconds": 0,
+      "artifact": null,
+      "output": "Command not found: [Errno 2] No such file or directory: 'go'"
+    },
+    {
+      "name": "frailbox",
+      "status": "FAIL",
+      "elapsed_seconds": 0.031,
+      "artifact": null,
+      "output": "gcc -Wall -Wextra -Wpedantic -std=c2x -O2 -g -D_FORTIFY_SOURCE=3 -fstack-protector-strong -fPIE -Iinclude -MMD -MP -c src/arena.c -o build/src/arena.o\nsrc/arena.c:17:23: error: use of undeclared identifier 'MAP_HUGETLB'\n   17 |         mmap_flags |= MAP_HUGETLB;\n      |                       ^\nsrc/arena.c:179:17: warning: comparison of distinct pointer types ('const void *' and 'char *') [-Wcompare-distinct-pointer-types]\n  179 |             ptr < (char *)region->start + region->size) {\n      |             ~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n1 warning and 1 error generated.\nmake: *** [build/src/arena.o] Error 1"
+    },
+    {
+      "name": "engine",
+      "status": "FAIL",
+      "elapsed_seconds": 0,
+      "artifact": null,
+      "output": "Command not found: [Errno 2] No such file or directory: 'cmake'"
+    },
+    {
+      "name": "compliance",
+      "status": "FAIL",
+      "elapsed_seconds": 0.007,
+      "artifact": null,
+      "output": "The operation couldn\u2019t be completed. Unable to locate a Java Runtime.\nPlease visit http://www.java.com for information on installing Java."
+    },
+    {
+      "name": "v2-market-stream",
+      "status": "PASS",
+      "elapsed_seconds": 0.038,
+      "artifact": null,
+      "output": "Syntax OK"
+    },
+    {
+      "name": "nfc-scanner",
+      "status": "FAIL",
+      "elapsed_seconds": 0,
+      "artifact": null,
+      "output": "Command not found: [Errno 2] No such file or directory: 'luac'"
+    },
+    {
+      "name": "openapi-haskell",
+      "status": "FAIL",
+      "elapsed_seconds": 0,
+      "artifact": null,
+      "output": "Command not found: [Errno 2] No such file or directory: 'ghc'"
+    },
+    {
+      "name": "openapi-tools",
+      "status": "FAIL",
+      "elapsed_seconds": 0,
+      "artifact": null,
+      "output": "Command not found: [Errno 2] No such file or directory: 'luac'"
+    }
+  ],
+  "pr_note": "Encrypted diagnostic logd artifact was not created; include this JSON report showing why. The encrypted .logd is the required diagnostic content for PR review; this JSON file is metadata. Maintainers may ask you to remove these diagnostic artifacts before merging."
+}
diff --git a/v2/services/market_stream.rb b/v2/services/market_stream.rb
index 6eeb63a4..94eaabd8 100644
--- a/v2/services/market_stream.rb
+++ b/v2/services/market_stream.rb
@@ -54,6 +54,7 @@
 require 'redis'
 require 'sinatra/base'
 require 'logger'
+require_relative 'market_stream_reconnect_backoff'
 
 # ===─ Fucking Constants =================================================================================─
 
@@ -216,10 +217,11 @@ def schedule_reconnect
     # v2 reconnection: exponential backoff with max. We learned. We grew.
     return if Constants::WS_MAX_RECONNECTS && @reconnect_attempt >= Constants::WS_MAX_RECONNECTS
 
-    delay = [
-      Constants::WS_RECONNECT_BASE * (2 ** @reconnect_attempt),
-      Constants::WS_RECONNECT_MAX
-    ].min
+    delay = MarketStreamReconnectBackoff.delay(
+      @reconnect_attempt,
+      base_delay: Constants::WS_RECONNECT_BASE,
+      max_delay: Constants::WS_RECONNECT_MAX
+    )
 
     @reconnect_attempt += 1
 
diff --git a/v2/services/market_stream_reconnect_backoff.rb b/v2/services/market_stream_reconnect_backoff.rb
new file mode 100644
index 00000000..e807dc7e
--- /dev/null
+++ b/v2/services/market_stream_reconnect_backoff.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module MarketStreamReconnectBackoff
+  module_function
+
+  def delay(attempt, base_delay:, max_delay:, jitter: 0.0, random: Random::DEFAULT)
+    raise ArgumentError, 'attempt must be non-negative' if attempt.negative?
+    raise ArgumentError, 'base_delay must be positive' unless base_delay.positive?
+    raise ArgumentError, 'max_delay must be positive' unless max_delay.positive?
+    raise ArgumentError, 'jitter must be between 0.0 and 1.0' unless jitter.between?(0.0, 1.0)
+
+    base = [base_delay * (2**attempt), max_delay].min
+    return normalize(base) if jitter.zero?
+
+    offset = base * jitter * ((random.rand * 2.0) - 1.0)
+    normalize([[base + offset, 0.0].max, max_delay].min)
+  end
+
+  def normalize(value)
+    value == value.to_i ? value.to_i : value
+  end
+end
diff --git a/v2/services/market_stream_reconnect_backoff_test.rb b/v2/services/market_stream_reconnect_backoff_test.rb
new file mode 100644
index 00000000..f2f6c287
--- /dev/null
+++ b/v2/services/market_stream_reconnect_backoff_test.rb
@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+require 'minitest/autorun'
+require_relative 'market_stream_reconnect_backoff'
+
+class MarketStreamReconnectBackoffTest < Minitest::Test
+  class FixedRandom
+    def initialize(*values)
+      @values = values
+    end
+
+    def rand
+      @values.shift || 0.5
+    end
+  end
+
+  def test_initial_delay_uses_base_delay
+    assert_equal 1, MarketStreamReconnectBackoff.delay(0, base_delay: 1, max_delay: 120)
+    assert_equal 5, MarketStreamReconnectBackoff.delay(0, base_delay: 5, max_delay: 120)
+  end
+
+  def test_delay_grows_exponentially
+    assert_equal 2, MarketStreamReconnectBackoff.delay(1, base_delay: 1, max_delay: 120)
+    assert_equal 4, MarketStreamReconnectBackoff.delay(2, base_delay: 1, max_delay: 120)
+    assert_equal 64, MarketStreamReconnectBackoff.delay(6, base_delay: 1, max_delay: 120)
+  end
+
+  def test_delay_is_capped_at_maximum
+    assert_equal 120, MarketStreamReconnectBackoff.delay(7, base_delay: 1, max_delay: 120)
+    assert_equal 120, MarketStreamReconnectBackoff.delay(20, base_delay: 1, max_delay: 120)
+  end
+
+  def test_jitter_stays_within_symmetric_bounds
+    low = MarketStreamReconnectBackoff.delay(
+      0,
+      base_delay: 10,
+      max_delay: 120,
+      jitter: 0.2,
+      random: FixedRandom.new(0.0)
+    )
+    high = MarketStreamReconnectBackoff.delay(
+      0,
+      base_delay: 10,
+      max_delay: 120,
+      jitter: 0.2,
+      random: FixedRandom.new(1.0)
+    )
+
+    assert_in_delta 8.0, low, 0.0001
+    assert_in_delta 12.0, high, 0.0001
+  end
+
+  def test_jitter_never_exceeds_maximum_cap
+    delay = MarketStreamReconnectBackoff.delay(
+      4,
+      base_delay: 10,
+      max_delay: 50,
+      jitter: 0.5,
+      random: FixedRandom.new(1.0)
+    )
+
+    assert_equal 50, delay
+  end
+end