diff --git a/src/api/EpiData.ts b/src/api/EpiData.ts
index 1b3dfc5..142d2c5 100644
--- a/src/api/EpiData.ts
+++ b/src/api/EpiData.ts
@@ -118,6 +118,7 @@ export function loadDataSet(
   fixedParams: Record<string, unknown>,
   userParams: Record<string, unknown>,
   columns: string[],
+  api_key = '',
   columnRenamings: Record<string, string> = {},
 ): Promise<DataGroup | null> {
   const duplicates = get(expandedDataGroups).filter((d) => d.title == title);
@@ -131,7 +132,11 @@ export function loadDataSet(
       )
       .then(() => null);
   }
-  const url = new URL(ENDPOINT + `/${endpoint}/`);
+  let url_string = ENDPOINT + `/${endpoint}/`;
+  if (api_key !== '') {
+    url_string += `?api_key=${api_key}`;
+  }
+  const url = new URL(url_string);
   const params = cleanParams(userParams);
   Object.entries(fixedParams).forEach(([key, value]) => {
     url.searchParams.set(key, String(value));
@@ -168,10 +173,14 @@ export function loadDataSet(
     });
 }
 
-export function fetchCOVIDcastMeta(): Promise<
-  { geo_type: string; signal: string; data_source: string; time_type?: string }[]
-> {
-  const url = new URL(ENDPOINT + `/covidcast_meta/`);
+export function fetchCOVIDcastMeta(
+  api_key: string,
+): Promise<{ geo_type: string; signal: string; data_source: string; time_type?: string }[]> {
+  let url_string = ENDPOINT + `/covidcast_meta/`;
+  if (api_key !== '') {
+    url_string += `?api_key=${api_key}`;
+  }
+  const url = new URL(url_string);
   url.searchParams.set('format', 'json');
   return fetchImpl<{ geo_type: string; signal: string; data_source: string; time_type?: string }[]>(url).catch(
     (error) => {
@@ -190,8 +199,9 @@ export function importCDC({ locations, auth }: { locations: string; auth?: strin
     {
       epiweeks: epiRange(firstEpiWeek.cdc, currentEpiWeek),
     },
-    { auth, locations },
+    { locations },
     ['total', 'num1', 'num2', 'num3', 'num4', 'num5', 'num6', 'num7', 'num8'],
+    auth,
   );
 }
 
@@ -201,12 +211,14 @@ export function importCOVIDcast({
   geo_value,
   signal,
   time_type = 'day',
+  api_key,
 }: {
   data_source: string;
   signal: string;
   time_type?: string;
   geo_type: string;
   geo_value: string;
+  api_key: string;
 }): Promise<DataGroup | null> {
   const title = `[API] COVIDcast: ${data_source}:${signal} (${geo_type}:${geo_value})`;
   return loadDataSet(
@@ -221,6 +233,7 @@ export function importCOVIDcast({
     },
     { data_source, signal, time_type, geo_type, geo_value },
     ['value', 'stderr', 'sample_size'],
+    api_key,
   );
 }
 
@@ -343,7 +356,7 @@ export function importFluView({
     {
       epiweeks: epiRange(firstEpiWeek.fluview, currentEpiWeek),
     },
-    { regions, issues, lag, auth },
+    { regions, issues, lag },
     [
       'wili',
       'ili',
@@ -357,6 +370,7 @@ export function importFluView({
       'num_age_4',
       'num_age_5',
     ],
+    auth,
     {
       wili: '%wILI',
       ili: '%ILI',
@@ -395,8 +409,9 @@ export function importGHT({
     {
       epiweeks: epiRange(firstEpiWeek.ght, currentEpiWeek),
     },
-    { auth, locations, query },
+    { locations, query },
     ['value'],
+    auth,
   );
 }
 
@@ -456,8 +471,9 @@ export function importQuidel({ auth, locations }: { auth: string; locations: str
     {
       epiweeks: epiRange(firstEpiWeek.quidel, currentEpiWeek),
     },
-    { auth, locations },
+    { locations },
     ['value'],
+    auth,
   );
 }
 export function importSensors({
@@ -478,8 +494,9 @@ export function importSensors({
     {
       epiweeks: epiRange(firstEpiWeek.sensors, currentEpiWeek),
     },
-    { auth, names, locations },
+    { names, locations },
     ['value'],
+    auth,
   );
 }
 // twtr
@@ -504,8 +521,9 @@ export function importTwitter({
       : {
           epiweeks: epiRange(firstEpiWeek.twitter, currentEpiWeek),
         },
-    { auth, locations, resolution },
+    { locations, resolution },
     ['num', 'total', 'percent'],
+    auth,
   );
 }
 export function importWiki({
diff --git a/src/components/dialogs/dataSources/COVIDcast.svelte b/src/components/dialogs/dataSources/COVIDcast.svelte
index 10e9699..074c881 100644
--- a/src/components/dialogs/dataSources/COVIDcast.svelte
+++ b/src/components/dialogs/dataSources/COVIDcast.svelte
@@ -7,10 +7,13 @@
 
   export let id: string;
 
+  let api_key = '';
   let data_source = '';
   let signal = '';
   let geo_type = '';
   let geo_value = '';
+  let form_key = '';
+  let valid_key = true;
 
   let dataSources: (LabelValue & { signals: string[] })[] = [];
   let geoTypes: string[] = [];
@@ -23,38 +26,77 @@
     }
   }
 
-  onMount(() => {
-    fetchCOVIDcastMeta().then((res) => {
-      geoTypes = [...new Set(res.map((d) => d.geo_type))];
-      const byDataSource = new Map<string, LabelValue & { signals: string[] }>();
-      for (const row of res) {
-        const ds = byDataSource.get(row.data_source);
-        if (!ds) {
-          byDataSource.set(row.data_source, {
-            label: row.data_source,
-            value: row.data_source,
-            signals: [row.signal],
-          });
-        } else if (!ds.signals.includes(row.signal)) {
-          ds.signals.push(row.signal);
+  // Helper function; delay invoking "fn" until "ms" milliseconds have passed
+  const debounce = (fn: Function, ms = 500) => {
+    let timeoutId: ReturnType<typeof setTimeout>;
+    return function (this: any, ...args: any[]) {
+      clearTimeout(timeoutId);
+      timeoutId = setTimeout(() => fn.apply(this, args), ms);
+    };
+  };
+
+  function fetchMetadata() {
+    fetchCOVIDcastMeta(form_key).then((res) => {
+      if (res.length == 0) {
+        valid_key = false;
+      } else {
+        valid_key = true;
+        api_key = form_key; // API key is valid -> use it to fetch data later on
+        geoTypes = [...new Set(res.map((d) => d.geo_type))];
+        const byDataSource = new Map<string, LabelValue & { signals: string[] }>();
+        for (const row of res) {
+          const ds = byDataSource.get(row.data_source);
+          if (!ds) {
+            byDataSource.set(row.data_source, {
+              label: row.data_source,
+              value: row.data_source,
+              signals: [row.signal],
+            });
+          } else if (!ds.signals.includes(row.signal)) {
+            ds.signals.push(row.signal);
+          }
         }
+        byDataSource.forEach((entry) => {
+          entry.signals.sort();
+        });
+        dataSources = [...byDataSource.values()].sort((a, b) => a.value.localeCompare(b.value));
       }
-      byDataSource.forEach((entry) => {
-        entry.signals.sort();
-      });
-      dataSources = [...byDataSource.values()].sort((a, b) => a.value.localeCompare(b.value));
     });
+  }
+
+  onMount(() => {
+    fetchMetadata();
   });
 
   export function importDataSet() {
-    return fetchCOVIDcastMeta().then((res) => {
+    return fetchCOVIDcastMeta(api_key).then((res) => {
       const meta = res.filter((row) => row.data_source === data_source && row.signal === signal);
       const time_type = meta[0].time_type;
-      return importCOVIDcast({ data_source, signal, geo_type, geo_value, time_type });
+      return importCOVIDcast({ data_source, signal, geo_type, geo_value, time_type, api_key });
     });
   }
 </script>
 
+<div>
+  <label class="uk-form-label" for="{id}-apikey">
+    <a href="https://cmu-delphi.github.io/delphi-epidata/api/api_keys.html">API Key</a> (optional)
+  </label>
+  <div class="uk-form-controls">
+    <input
+      id="{id}-apikey"
+      type="text"
+      class="uk-input"
+      class:uk-form-danger={!valid_key}
+      name="api_key"
+      required={false}
+      bind:value={form_key}
+      on:input={debounce(() => fetchMetadata(), 500)}
+    />
+    {#if !valid_key}
+      <div class="invalid">API key is invalid - ignoring</div>
+    {/if}
+  </div>
+</div>
 <SelectField id="{id}-r" label="Data Source" name="data_source" bind:value={data_source} options={dataSources} />
 <SelectField id="{id}-r" label="Data Signal" name="signal" bind:value={signal} options={dataSignals} />
 <SelectField id="{id}-gt" label="Geographic Type" bind:value={geo_type} name="geo_type" options={geoTypes} />
@@ -65,3 +107,10 @@
   name="geo_values"
   placeholder="e.g., PA or 42003"
 />
+
+<style>
+  .invalid {
+    color: red;
+    font-size: 0.75rem;
+  }
+</style>