diff --git a/README.md b/README.md
index e203530..d058a26 100644
--- a/README.md
+++ b/README.md
@@ -120,6 +120,8 @@ Where `options` is an object and can contain the following:
 * `defaultTags`: Default tags used for all metric reporting. (optional)
     * Set tags that are common to all metrics.
 * `agent`: custom https agent (optional)
+* `apiHost`: Sets the hostname of the target API endpoint. (optional)
+    * Defaults to `api.datadoghq.com`
 
 
 Example:
diff --git a/lib/loggers.js b/lib/loggers.js
index ab3d3e4..f3f7233 100644
--- a/lib/loggers.js
+++ b/lib/loggers.js
@@ -26,8 +26,10 @@ var Histogram = require('./metrics').Histogram;
 //     - apiKey: DataDog API key
 //     - appKey: DataDog APP key
 //     - host: Default host for all reported metrics
+//     - apiHost: Hostname dogapi uses to send metrics to
 //     - prefix: Default key prefix for all metrics
 //     - agent: a https agent, passed as dogapi's proxy_agent
+//     - intervalHandler: alternative interval handler vs. default setTimeout
 //     - flushIntervalSeconds:
 //
 // You can also use it to override (dependency-inject) the aggregator
@@ -38,10 +40,13 @@ var Histogram = require('./metrics').Histogram;
 //
 function BufferedMetricsLogger(opts) {
     this.aggregator = opts.aggregator || new Aggregator(opts.defaultTags);
-    this.reporter = opts.reporter || new DataDogReporter(opts.apiKey, opts.appKey, opts.agent);
+    this.reporter = opts.reporter || new DataDogReporter(opts.apiKey, opts.appKey, opts.agent, opts.apiHost);
     this.host = opts.host;
     this.prefix = opts.prefix || '';
     this.flushIntervalSeconds = opts.flushIntervalSeconds;
+    this.intervalHandler = opts.intervalHandler || function(callback, delay) {
+        return setTimeout(callback, delay);
+    };
 
     if (this.flushIntervalSeconds) {
         debug('Auto-flushing every %d seconds', this.flushIntervalSeconds);
@@ -54,9 +59,13 @@ function BufferedMetricsLogger(opts) {
         self.flush();
         if (self.flushIntervalSeconds) {
             var interval = self.flushIntervalSeconds * 1000;
-            var tid = setTimeout(autoFlushCallback, interval);
-            // Let the event loop exit if this is the only active timer.
-            tid.unref();
+            var tid = self.intervalHandler(autoFlushCallback, interval);
+            // `.unref()` is not available on browser `setTimeout()`
+            if (typeof tid.unref === 'function') {
+                // Node provides `.unref()` to let the event loop exit
+                // if this is the only active timer left.
+                tid.unref();
+            }
         }
     };
 
diff --git a/lib/reporters.js b/lib/reporters.js
index 6b74320..881ba8b 100644
--- a/lib/reporters.js
+++ b/lib/reporters.js
@@ -13,24 +13,26 @@ function NullReporter(apiKey, appKey) {
 
 NullReporter.prototype.report = function(series, onSuccess, onError) {
     // Do nothing.
-    onSuccess();
+    if (typeof onSuccess === 'function') {
+        onSuccess();
+    }
 };
 
 
 //
 // DataDogReporter
 //
-
-function DataDogReporter(apiKey, appKey, agent) {
+function DataDogReporter(apiKey, appKey, agent, apiHost) {
     apiKey = apiKey || process.env.DATADOG_API_KEY;
     appKey = appKey || process.env.DATADOG_APP_KEY;
+    apiHost = apiHost || process.env.DATADOG_API_HOST || 'api.datadoghq.com';
 
     if (!apiKey) {
         throw new Error('DATADOG_API_KEY environment variable not set');
     }
 
     // jscs:disable requireCamelCaseOrUpperCaseIdentifiers
-    dogapi.initialize({api_key: apiKey, app_key: appKey, proxy_agent: agent });
+    dogapi.initialize({ api_key: apiKey, app_key: appKey, api_host: apiHost, proxy_agent: agent });
     // jscs:enable requireCamelCaseOrUpperCaseIdentifiers
 }
 
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..8dbf99a
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2909 @@
+{
+  "name": "datadog-metrics",
+  "version": "0.8.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
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+      "resolved": "https://registry.npmjs.org/JSV/-/JSV-4.0.2.tgz",
+      "integrity": "sha1-0Hf2glVx+CEy+d/67Vh7QCn+/1c=",
+      "dev": true
+    },
+    "acorn": {
+      "version": "5.7.3",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
+      "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
+      "dev": true
+    },
+    "ajv": {
+      "version": "6.5.5",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.5.5.tgz",
+      "integrity": "sha512-7q7gtRQDJSyuEHjuVgHoUa2VuemFiCMrfQc9Tc08XTAc4Zj/5U1buQJ0HU6i7fKjXU09SVgSmxa4sLvuvS8Iyg==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
+    "align-text": {
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+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
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+      "dev": true,
+      "requires": {
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
+      }
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+      "requires": {
+        "isexe": "^2.0.0"
+      }
+    },
+    "window-size": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.4.tgz",
+      "integrity": "sha1-+OGqHuWlPsW/FR/6CXQqatdpeHY=",
+      "dev": true
+    },
+    "winston": {
+      "version": "0.8.3",
+      "resolved": "http://registry.npmjs.org/winston/-/winston-0.8.3.tgz",
+      "integrity": "sha1-ZLar9M0Brcrv1QCTk7HY6L7BnbA=",
+      "dev": true,
+      "requires": {
+        "async": "0.2.x",
+        "colors": "0.6.x",
+        "cycle": "1.0.x",
+        "eyes": "0.1.x",
+        "isstream": "0.1.x",
+        "pkginfo": "0.3.x",
+        "stack-trace": "0.0.x"
+      },
+      "dependencies": {
+        "colors": {
+          "version": "0.6.2",
+          "resolved": "https://registry.npmjs.org/colors/-/colors-0.6.2.tgz",
+          "integrity": "sha1-JCP+ZnisDF2uiFLl0OW+CMmXq8w=",
+          "dev": true
+        },
+        "pkginfo": {
+          "version": "0.3.1",
+          "resolved": "https://registry.npmjs.org/pkginfo/-/pkginfo-0.3.1.tgz",
+          "integrity": "sha1-Wyn2qB9wcXFC4J52W76rl7T4HiE=",
+          "dev": true
+        }
+      }
+    },
+    "wordwrap": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
+      "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
+      "dev": true
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "xmlbuilder": {
+      "version": "3.1.0",
+      "resolved": "http://registry.npmjs.org/xmlbuilder/-/xmlbuilder-3.1.0.tgz",
+      "integrity": "sha1-LIaIjy1OrehQ+jjKf3Ij9yCVFuE=",
+      "dev": true,
+      "requires": {
+        "lodash": "^3.5.0"
+      }
+    },
+    "y18n": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+      "dev": true
+    },
+    "yargs": {
+      "version": "3.27.0",
+      "resolved": "http://registry.npmjs.org/yargs/-/yargs-3.27.0.tgz",
+      "integrity": "sha1-ISBUaTFuk5Ex1Z8toMbX+YIh6kA=",
+      "dev": true,
+      "requires": {
+        "camelcase": "^1.2.1",
+        "cliui": "^2.1.0",
+        "decamelize": "^1.0.0",
+        "os-locale": "^1.4.0",
+        "window-size": "^0.1.2",
+        "y18n": "^3.2.0"
+      }
+    },
+    "yauzl": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.4.1.tgz",
+      "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "fd-slicer": "~1.0.1"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index 06ae2c4..a55f517 100644
--- a/package.json
+++ b/package.json
@@ -24,12 +24,12 @@
     "chai": "3.5.0",
     "chai-string": "1.1.6",
     "jscs": "2.9.0",
-    "jshint": "2.9.1",
+    "jshint": "^2.9.6",
     "jshint-stylish-ex": "0.2.0",
     "mocha": "2.4.5"
   },
   "dependencies": {
     "debug": "3.1.0",
-    "dogapi": "1.1.0"
+    "dogapi": "2.8.3"
   }
 }
diff --git a/test/loggers_tests.js b/test/loggers_tests.js
index 4646f54..8d7743d 100644
--- a/test/loggers_tests.js
+++ b/test/loggers_tests.js
@@ -131,4 +131,85 @@ describe('BufferedMetricsLogger', function() {
         dogapi.client.proxy_agent.keepAliveMsecs.should.equal(10);
         // jscs:enable requireCamelCaseOrUpperCaseIdentifiers
     });
+
+    describe('for intervalHandler option', function() {
+        var dummySeries = [1,2,3];
+        var dummyTid = 123;
+
+        it('should allow setting a never interval handler', function() {
+            var flushCalled = 0;
+            var neverIntervalHandler = function(_callback, _msInterval) {
+                return dummyTid;
+            };
+            var testAggregator = {
+                flush: function() {
+                    flushCalled = flushCalled + 1;
+                    return dummySeries;
+                }
+            };
+            new BufferedMetricsLogger({
+                reporter: new reporters.NullReporter(),
+                aggregator: testAggregator,
+                intervalHandler: neverIntervalHandler,
+                flushIntervalSeconds: 1,
+            });
+
+            // flush should've been called twice
+            // - from constructor
+            flushCalled.should.eq(1);
+        });
+
+        it('should allow setting an immediate interval handler', function() {
+            var flushCalled = 0;
+            var intervalTicked = 0;
+            var immediateIntervalHandler = function(callback, _msInterval) {
+                // call right away but ONLY once
+                intervalTicked++;
+                if (intervalTicked < 2) {
+                    callback();
+                }
+                return dummyTid;
+            };
+            var testAggregator = {
+                flush: function() {
+                    flushCalled = flushCalled + 1;
+                    return dummySeries;
+                }
+            };
+            new BufferedMetricsLogger({
+                reporter: new reporters.NullReporter(),
+                aggregator: testAggregator,
+                intervalHandler: immediateIntervalHandler,
+                flushIntervalSeconds: 1,
+            });
+
+            // flush should've been called twice
+            // - from constructor
+            // - from interval callback
+            flushCalled.should.eq(2);
+        });
+
+        it('should allow setting an immediate interval handler', function() {
+            var unrefCalled = 0;
+            var unrefIntervalHandler = function(callback, _msInterval) {
+                return {
+                    unref: function() { unrefCalled = unrefCalled + 1; }
+                };
+            };
+            var testAggregator = {
+                flush: function() {
+                    return dummySeries;
+                }
+            };
+            new BufferedMetricsLogger({
+                reporter: new reporters.NullReporter(),
+                aggregator: testAggregator,
+                intervalHandler: unrefIntervalHandler,
+                flushIntervalSeconds: 1,
+            });
+
+            // .unref() should be called if provided
+            unrefCalled.should.eq(1);
+        });
+    });
 });