diff --git a/modules/express/package.json b/modules/express/package.json
index cf3b4ff612..4ba8bc49cc 100644
--- a/modules/express/package.json
+++ b/modules/express/package.json
@@ -40,6 +40,7 @@
     "@bitgo/abstract-lightning": "^2.0.0",
     "@bitgo/sdk-core": "^29.0.0",
     "@bitgo/utxo-lib": "^11.2.2",
+    "@types/proxyquire": "^1.3.31",
     "argparse": "^1.0.10",
     "bitgo": "^40.0.0",
     "bluebird": "^3.5.3",
@@ -52,6 +53,7 @@
     "lodash": "^4.17.20",
     "morgan": "^1.9.1",
     "proxy-agent": "6.4.0",
+    "proxyquire": "^2.1.3",
     "superagent": "^9.0.1"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 1e7fe864ac..adac9e7e4e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5497,6 +5497,11 @@
   resolved "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.14.tgz#1433419d73b2a7ebfc6918dcefd2ec0d5cd698f2"
   integrity sha512-gNMvNH49DJ7OJYv+KAKn0Xp45p8PLl6zo2YnvDIbTd4J6MER2BmWN49TG7n9LvkyihINxeKW8+3bfS2yDC9dzQ==
 
+"@types/proxyquire@^1.3.31":
+  version "1.3.31"
+  resolved "https://registry.npmjs.org/@types/proxyquire/-/proxyquire-1.3.31.tgz#a008b78dad6061754e3adf2cb64b60303f68deaa"
+  integrity sha512-uALowNG2TSM1HNPMMOR0AJwv4aPYPhqB0xlEhkeRTMuto5hjoSPZkvgu1nbPUkz3gEPAHv4sy4DmKsurZiEfRQ==
+
 "@types/qrcode@1.5.0":
   version "1.5.0"
   resolved "https://registry.npmjs.org/@types/qrcode/-/qrcode-1.5.0.tgz#6a98fe9a9a7b2a9a3167b6dde17eff999eabe40b"
@@ -10956,6 +10961,14 @@ filelist@^1.0.4:
   dependencies:
     minimatch "^5.0.1"
 
+fill-keys@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.npmjs.org/fill-keys/-/fill-keys-1.0.2.tgz#9a8fa36f4e8ad634e3bf6b4f3c8882551452eb20"
+  integrity sha512-tcgI872xXjwFF4xgQmLxi76GnwJG3g/3isB1l4/G5Z4zrbddGpBjqZCO9oEAcB5wX0Hj/5iQB3toxfO7in1hHA==
+  dependencies:
+    is-object "~1.0.1"
+    merge-descriptors "~1.0.0"
+
 fill-range@^7.1.1:
   version "7.1.1"
   resolved "https://registry.npmjs.org/fill-range/-/fill-range-7.1.1.tgz#44265d3cac07e3ea7dc247516380643754a05292"
@@ -12703,6 +12716,11 @@ is-obj@^2.0.0:
   resolved "https://registry.npmjs.org/is-obj/-/is-obj-2.0.0.tgz#473fb05d973705e3fd9620545018ca8e22ef4982"
   integrity sha512-drqDG3cbczxxEJRoOXcOjtdp1J/lyp1mNn0xaznRs8+muBhgQcrnbspox5X5fOw0HnMnbfDzvnEMEtqDEJEo8w==
 
+is-object@~1.0.1:
+  version "1.0.2"
+  resolved "https://registry.npmjs.org/is-object/-/is-object-1.0.2.tgz#a56552e1c665c9e950b4a025461da87e72f86fcf"
+  integrity sha512-2rRIahhZr2UWb45fIOuvZGpFtz0TyOZLf32KxBbSoUCeZR495zCKlWUKKUByk3geS2eAs7ZAABt0Y/Rx0GiQGA==
+
 is-path-cwd@^2.0.0:
   version "2.2.0"
   resolved "https://registry.npmjs.org/is-path-cwd/-/is-path-cwd-2.2.0.tgz#67d43b82664a7b5191fd9119127eb300048a9fdb"
@@ -14234,7 +14252,7 @@ merge-descriptors@1.0.1:
   resolved "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.1.tgz#b00aaa556dd8b44568150ec9d1b953f3f90cbb61"
   integrity sha512-cCi6g3/Zr1iqQi6ySbseM1Xvooa98N0w31jzUYrXPX2xqObmFGHJ0tQ5u74H3mVh7wLouTseZyYIq39g8cNp1w==
 
-merge-descriptors@1.0.3:
+merge-descriptors@1.0.3, merge-descriptors@~1.0.0:
   version "1.0.3"
   resolved "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.3.tgz#d80319a65f3c7935351e5cfdac8f9318504dbed5"
   integrity sha512-gaNvAS7TZ897/rVaZ0nMtAyxNyi/pdbjbAwUpFQpN70GqnVfOiXpeUUMKRBmzXaSQ8DdTX4/0ms62r2K+hE6mQ==
@@ -14626,6 +14644,11 @@ module-deps@^4.0.8:
     through2 "^2.0.0"
     xtend "^4.0.0"
 
+module-not-found-error@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.npmjs.org/module-not-found-error/-/module-not-found-error-1.0.1.tgz#cf8b4ff4f29640674d6cdd02b0e3bc523c2bbdc0"
+  integrity sha512-pEk4ECWQXV6z2zjhRZUongnLJNUeGQJ3w6OQ5ctGwD+i5o93qjRQUk2Rt6VdNeu3sEP0AB4LcfvdebpxBRVr4g==
+
 monocle-ts@^2.3.13:
   version "2.3.13"
   resolved "https://registry.npmjs.org/monocle-ts/-/monocle-ts-2.3.13.tgz#7c8af489613cd5175df2ea3c02c57c6151995e5d"
@@ -16681,6 +16704,15 @@ proxy-from-env@^1.0.0, proxy-from-env@^1.1.0:
   resolved "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-1.1.0.tgz#e102f16ca355424865755d2c9e8ea4f24d58c3e2"
   integrity sha512-D+zkORCbA9f1tdWRK0RaCR3GPv50cMxcrz4X8k5LTSUD1Dkw47mKJEZQNunItRTkWwgtaUSo1RVFRIG9ZXiFYg==
 
+proxyquire@^2.1.3:
+  version "2.1.3"
+  resolved "https://registry.npmjs.org/proxyquire/-/proxyquire-2.1.3.tgz#2049a7eefa10a9a953346a18e54aab2b4268df39"
+  integrity sha512-BQWfCqYM+QINd+yawJz23tbBM40VIGXOdDw3X344KcclI/gtBbdWF6SlQ4nK/bYhF9d27KYug9WzljHC6B9Ysg==
+  dependencies:
+    fill-keys "^1.0.2"
+    module-not-found-error "^1.0.1"
+    resolve "^1.11.1"
+
 psl@^1.1.28:
   version "1.15.0"
   resolved "https://registry.npmjs.org/psl/-/psl-1.15.0.tgz#bdace31896f1d97cec6a79e8224898ce93d974c6"
@@ -17417,7 +17449,7 @@ resolve@1.1.7:
   resolved "https://registry.npmjs.org/resolve/-/resolve-1.1.7.tgz#203114d82ad2c5ed9e8e0411b3932875e889e97b"
   integrity sha512-9znBF0vBcaSN3W2j7wKvdERPwqTxSpCq+if5C0WoTCyV9n24rua28jeuQ2pL/HOf+yUe/Mef+H/5p60K0Id3bg==
 
-resolve@^1.1.3, resolve@^1.1.4, resolve@^1.1.6, resolve@^1.10.0, resolve@^1.14.2, resolve@^1.17.0, resolve@^1.22.3, resolve@^1.22.4, resolve@^1.9.0, resolve@~1.22.6:
+resolve@^1.1.3, resolve@^1.1.4, resolve@^1.1.6, resolve@^1.10.0, resolve@^1.11.1, resolve@^1.14.2, resolve@^1.17.0, resolve@^1.22.3, resolve@^1.22.4, resolve@^1.9.0, resolve@~1.22.6:
   version "1.22.10"
   resolved "https://registry.npmjs.org/resolve/-/resolve-1.22.10.tgz#b663e83ffb09bbf2386944736baae803029b8b39"
   integrity sha512-NPRy+/ncIMeDlTAsuqwKIiferiawhefFJtkNSW0qZJEqMEb+qBt/77B/jGeeek+F0uOeN05CDa6HXbbIgtVX4w==