diff --git a/config/index.js b/config/index.js
index 542ffb1..00bb0ca 100644
--- a/config/index.js
+++ b/config/index.js
@@ -1,11 +1,22 @@
 /*
   Common configuration settings.
+  Default settings in this file can be overridden by an environment variable.
 */
 
 const config = {
+  // This is the same secret used by jwt-bch-api
   apiTokenSecret: process.env.TOKENSECRET
     ? process.env.TOKENSECRET
-    : 'secret-jwt-token'
+    : 'secret-jwt-token',
+
+  // Rate Limits
+  anonRateLimit: process.env.ANON_RATE_LIMIT ? process.env.ANON_RATE_LIMIT : 50,
+  whitelistRateLimit: process.env.WHITELIST_RATE_LIMIT
+    ? process.env.WHITELIST_RATE_LIMIT
+    : 10,
+  whitelistDomains: process.env.WHITELIST_DOMAINS
+    ? process.env.WHITELIST_DOMAINS.split(',')
+    : ['fullstack.cash', 'psfoundation.cash']
 }
 
 module.exports = config
diff --git a/package.json b/package.json
index 3afd381..0597122 100644
--- a/package.json
+++ b/package.json
@@ -17,12 +17,13 @@
     "test": "npm run lint && npm run test-v4",
     "lint": "standard --env mocha --fix",
     "test-v4": "export NETWORK=mainnet && nyc --reporter=text mocha --timeout 60000 test/v4/",
-    "test:temp": "export NETWORK=mainnet && export TEST=integration && mocha --timeout 25000 test/v4/integration/price.js",
     "test:integration": "mocha test/v4/integration",
     "test:integration:slpdb": "mocha --timeout 25000 -g '#validate2Single' test/v4/integration/slp*.js",
     "coverage": "nyc report --reporter=text-lcov | coveralls",
     "coverage:report": "export NETWORK=mainnet && nyc --reporter=html mocha --timeout 25000 test/v4/",
-    "docs": "./node_modules/.bin/apidoc -i src/routes/v4 -o docs"
+    "docs": "./node_modules/.bin/apidoc -i src/routes/v4 -o docs",
+    "test:temp1": "export NETWORK=mainnet && export TEST=integration && mocha --timeout 25000 test/v4/integration/price.js",
+    "test:temp2": "mocha test/v4/rate-limits.js"
   },
   "engines": {
     "node": ">=10.15.1"
diff --git a/src/middleware/route-ratelimit.js b/src/middleware/route-ratelimit.js
index cce93d0..a89ee2c 100644
--- a/src/middleware/route-ratelimit.js
+++ b/src/middleware/route-ratelimit.js
@@ -12,12 +12,17 @@
 
 'use strict'
 
+// Public npm libraries.
 const jwt = require('jsonwebtoken')
 
+// local libraries.
 const wlogger = require('../util/winston-logging')
 const config = require('../../config')
 
-const ANON_LIMITS = 50
+const ANON_LIMITS = config.anonRateLimit
+const WHITELIST_RATE_LIMIT = config.whitelistRateLimit
+const WHITELIST_DOMAINS = config.whitelistDomains
+const INTERNAL_RATE_LIMIT = 1
 
 // Redis
 const redisOptions = {
@@ -144,13 +149,10 @@ class RateLimits {
 
           // If the request originates from one of the approved wallet apps, then
           // apply paid-access rate limits.
-          if (
-            origin &&
-            (origin.toString().indexOf('fullstack.cash') > -1 ||
-              origin.toString().indexOf('splitbch.com') > -1 ||
-              origin.toString().indexOf('slp-api') > -1)
-          ) {
-            pointsToConsume = 10
+          // console.log(`origin: ${JSON.stringify(origin, null, 2)}`)
+          // console.log(`whitelist: ${JSON.stringify(WHITELIST_DOMAINS, null, 2)}`)
+          if (this.isInWhitelist(origin)) {
+            pointsToConsume = WHITELIST_RATE_LIMIT
             res.locals.pointsToConsume = pointsToConsume // Feedback for tests.
           }
 
@@ -161,7 +163,7 @@ class RateLimits {
             // Do not comment out this line.
             key.toString().indexOf('172.17.') > -1
           ) {
-            pointsToConsume = 1
+            pointsToConsume = INTERNAL_RATE_LIMIT
             res.locals.pointsToConsume = pointsToConsume // Feedback for tests.
           }
 
@@ -263,6 +265,31 @@ class RateLimits {
       throw err
     }
   }
+
+  // Returns a boolean if the origin of the request matches a domain in the
+  // whitelist.
+  isInWhitelist (origin) {
+    try {
+      const retVal = false // Default value.
+
+      if (!origin) return false
+
+      // console.log(`WHITELIST_DOMAINS: ${JSON.stringify(WHITELIST_DOMAINS, null, 2)}`)
+
+      for (let i = 0; i < WHITELIST_DOMAINS.length; i++) {
+        const thisDomain = WHITELIST_DOMAINS[i]
+
+        if (origin.toString().indexOf(thisDomain) > -1) {
+          return true
+        }
+      }
+
+      return retVal
+    } catch (err) {
+      wlogger.error('Error in route-ratelimit.js/isInWhitelist(). Returning false by default.')
+      return false
+    }
+  }
 }
 
 module.exports = RateLimits
diff --git a/test/v4/rate-limits.js b/test/v4/rate-limits.js
index 5dd61ff..6ebaeee 100644
--- a/test/v4/rate-limits.js
+++ b/test/v4/rate-limits.js
@@ -445,6 +445,30 @@ describe('#route-ratelimits & jwt-auth', () => {
       assert.equal(res.locals.pointsToConsume, 50)
     })
   })
+
+  describe('#isInWhitelist', () => {
+    it('should return false when no argument is passed in', () => {
+      const result = rateLimits.isInWhitelist()
+
+      assert.equal(result, false)
+    })
+
+    it('should return false when origin is not in the whitelist', () => {
+      const origin = 'blah.com'
+
+      const result = rateLimits.isInWhitelist(origin)
+
+      assert.equal(result, false)
+    })
+
+    it('should return true when origin is in the whitelist', () => {
+      const origin = 'message.fullstack.cash'
+
+      const result = rateLimits.isInWhitelist(origin)
+
+      assert.equal(result, true)
+    })
+  })
 })
 
 // Generates a Basic authorization header.