diff --git a/gratipay/homepage.py b/gratipay/homepage.py
index a183288803..e189998998 100644
--- a/gratipay/homepage.py
+++ b/gratipay/homepage.py
@@ -13,10 +13,10 @@ def _parse(raw):
     """
 
     errors = []
-    x = lambda f: raw.get(f, '').strip()
+    x = lambda f: raw[f].strip()  # KeyError -> 400
 
     # amount
-    amount = x('amount') or '0'
+    amount = x('amount')
     if (not amount.isdigit()) or (int(amount) < 10):
         errors.append('amount')
         amount = ''.join(x for x in amount.split('.')[0] if x.isdigit())
@@ -105,6 +105,7 @@ def pay_for_open_source(app, raw):
     payment_method_nonce = parsed.pop('payment_method_nonce')
     payment_for_open_source = _store(parsed)
     if not errors:
+        import pdb; pdb.set_trace()
         result = _charge(parsed['amount'], payment_method_nonce)
         payment_for_open_source.process_result(result)
         if not payment_for_open_source.succeeded:
diff --git a/gratipay/models/payment_for_open_source.py b/gratipay/models/payment_for_open_source.py
index 905a122e2a..e8f6e1fc9e 100644
--- a/gratipay/models/payment_for_open_source.py
+++ b/gratipay/models/payment_for_open_source.py
@@ -11,7 +11,7 @@ class PaymentForOpenSource(Model):
     typname = "payments_for_open_source"
 
     def __repr__(self):
-        return '<PaymentForOpenSource: %s>'.format(repr(self.amount))
+        return '<PaymentForOpenSource: {}>'.format(repr(self.amount))
 
 
     @property
diff --git a/js/gratipay/homepage.js b/js/gratipay/homepage.js
index d07ca9be7e..469c3ad4fd 100644
--- a/js/gratipay/homepage.js
+++ b/js/gratipay/homepage.js
@@ -3,38 +3,33 @@ Gratipay.homepage = {}
 Gratipay.homepage.initForm = function(clientAuthorization) {
     $form = $('#homepage #content form');
 
-    $submit= $form.find('button[type=submit]');
-    $submit.click(Gratipay.homepage.submitForm);
-
-    $chooseEcosystem = $form.find('.ecosystem-chooser button');
-    $chooseEcosystem.click(function(e) {
-        e.preventDefault();
-        Gratipay.notification('Not implemented.', 'error');
-    });
-
     $promote = $form.find('.promotion-gate button');
     $promote.click(Gratipay.homepage.openPromote);
 
+    function callback(createErr, instance) {
+        $submit = $form.find('button[type=submit]');
+        $submit.click(function(e) {
+            e.preventDefault();
+            instance.requestPaymentMethod(function(requestPaymentMethodErr, payload) {
+                Gratipay.homepage.submitFormWithNonce(payload.nonce);
+            });
+        });
+    }
+
     braintree.dropin.create({
       authorization: clientAuthorization,
       container: '#braintree-container'
-    }, function (createErr, instance) {
-      $submit.click(function () {
-        instance.requestPaymentMethod(function (requestPaymentMethodErr, payload) {
-          // Submit payload.nonce to your server
-        });
-      });
-    });
-}
+    }, callback);
+};
 
-Gratipay.homepage.submitForm = function(e) {
-    e.preventDefault();
 
-    $input = $(this)
-    $form = $(this).parent('form');
+Gratipay.homepage.submitFormWithNonce = function(nonce) {
+    $submit = $form.find('button[type=submit]');
+    $form = $('#homepage #content form');
     var data = new FormData($form[0]);
+    data.set('payment_method_nonce', nonce);
 
-    $input.prop('disable', true);
+    $submit.prop('disable', true);
 
     $.ajax({
         url: $form.attr('action'),
@@ -43,16 +38,21 @@ Gratipay.homepage.submitForm = function(e) {
         processData: false,
         contentType: false,
         dataType: 'json',
-        success: function (d) {
+        success: function(d) {
             $('a.team_url').attr('href', d.team_url).text(d.team_url);
             $('a.review_url').attr('href', d.review_url).text(d.review_url);
             $('form').slideUp(500, function() {
                 $('.application-complete').slideDown(250);
             });
         },
-        error: [Gratipay.error, function() { $input.prop('disable', false); }]
+        error: function(e) {
+            console.log(e);
+            debugger;
+            Gratipay.error(e);
+            $submit.prop('disable', false);
+        }
     });
-}
+};
 
 Gratipay.homepage.openPromote = function(e) {
     e.preventDefault();
@@ -60,4 +60,4 @@ Gratipay.homepage.openPromote = function(e) {
     $('.promotion-fields').slideDown(function() {
         $('.promotion-fields input:first').focus();
     });
-}
+};
diff --git a/tests/py/test_www_homepage.py b/tests/py/test_www_homepage.py
index edab4c09ac..3b22c5daba 100644
--- a/tests/py/test_www_homepage.py
+++ b/tests/py/test_www_homepage.py
@@ -167,7 +167,21 @@ def test_flags_failures_with_transaction_id(self):
 
 
     def test_post_gets_json(self):
-        response = self.client.POST('/', data=GOOD)
+        response = self.client.POST('/', data=GOOD, HTTP_ACCEPT=b'application/json')
         assert response.code == 200
         assert response.headers['Content-Type'] == 'application/json'
         assert json.loads(response.body) == {'parsed': {}, 'errors': []}
+
+    def test_bad_post_gets_400(self):
+        response = self.client.PxST('/', data=BAD, HTTP_ACCEPT=b'application/json')
+        assert response.code == 400
+        assert response.headers['Content-Type'] == 'application/json'
+        scrubbed = SCRUBBED.copy()
+        scrubbed.pop('payment_method_nonce')  # consumed
+        assert json.loads(response.body) == {'parsed': scrubbed, 'errors': ALL}
+
+    def test_really_bad_post_gets_plain_400(self):
+        response = self.client.PxST('/', data={}, HTTP_ACCEPT=b'application/json')
+        assert response.code == 400
+        assert response.headers == {}
+        assert response.body == "Missing key: u'amount'"
diff --git a/tests/ttw/test_homepage.py b/tests/ttw/test_homepage.py
index bcfb1dbe7b..29848ad953 100644
--- a/tests/ttw/test_homepage.py
+++ b/tests/ttw/test_homepage.py
@@ -5,6 +5,28 @@
 
 class Tests(BrowserHarness):
 
+    def fill_form(self, amount, credit_card_number, expiration, cvv, name, email_address,
+                  follow_up, promotion_name, promotion_url, promotion_twitter, promotion_message):
+        self.wait_for('.braintree-form-number')
+        self.fill('amount', amount)
+        with self.get_iframe('braintree-hosted-field-number') as iframe:
+            iframe.fill('credit-card-number', credit_card_number)
+        with self.get_iframe('braintree-hosted-field-expirationDate') as iframe:
+            iframe.fill('expiration', expiration)
+        with self.get_iframe('braintree-hosted-field-cvv') as iframe:
+            iframe.fill('cvv', cvv)
+        self.fill('name', name)
+        self.fill('email_address', email_address)
+        if promotion_name:
+            self.css('.promotion-gate button').type('\n')
+                                                # stackoverflow.com/q/11908249#comment58577676_19763087
+            self.wait_for('#promotion-message')
+            self.fill('promotion_name', promotion_name)
+            self.fill('promotion_url', promotion_url)
+            self.fill('promotion_twitter', promotion_twitter)
+            self.fill('promotion_message', promotion_message)
+
+
     def test_loads_for_anon(self):
         assert self.css('#banner h1').html == 'Pay for open source.'
         assert self.css('#header .sign-in button').html.strip()[:17] == 'Sign in / Sign up'
@@ -15,3 +37,18 @@ def test_redirects_for_authed_exclamation_point(self):
         self.reload()
         assert self.css('#banner h1').html == 'Browse'
         assert self.css('.you-are a').html.strip()[:6] == '~alice'
+
+    def test_anon_can_post(self):
+        self.fill_form('537', '4242424242424242', '1020', '123', 'Alice Liddell',
+                       'alice@example.com', 'monthly', 'Wonderland', 'http://www.example.com/',
+                       'thebestbutter', 'Love me! Love me! Say that you love me!')
+        self.css('fieldset.submit button').type('\n')
+        import pdb; pdb.set_trace()
+        assert self.db.one('SELECT * FROM payments_for_open_source').promotion_name == 'Wonderland'
+
+    def est_validation_works(self):
+        self.fill_form('537', '4242424242424242', '', '', 'Alice Liddell', 'alice@example.com',
+                       'monthly', 'Wonderland', 'http://www.example.com/', 'thebestbutter',
+                       'Love me! Love me! Say that you love me!')
+        self.css('fieldset.submit button').type('\n')
+        assert self.db.one('select * from moral_license_payments').promotion_name == 'Wonderland'
diff --git a/www/index.spt b/www/index.spt
index 73015fa217..9d65d86b05 100644
--- a/www/index.spt
+++ b/www/index.spt
@@ -1,4 +1,6 @@
 # -*- coding: utf-8 -*-
+import json
+from aspen import Response
 from gratipay.homepage import pay_for_open_source
 [---]
 if not user.ANON:
@@ -7,6 +9,9 @@ suppress_sidebar = True
 page_id = "homepage"
 banner = "Pay for Open Source"
 result = pay_for_open_source(website.app, request.body) if request.method == 'POST' else {}
+if result.get('errors'):
+    # Hmmm ... bit of an Aspen rough spot ... interaction w/ error.spt, skip it
+    raise Response(400, json.dumps(result), {'Content-Type': 'application/json'})
 [---] application/json via json_dump
 result
 [---] text/html
@@ -37,7 +42,7 @@ $(document).ready(function() {
 {% endblock %}
 
 {% block content %}
-<form action="/companies/create.json" method="POST">
+<form action="/" method="POST">
     <input type="hidden" name="csrf_token" value="{{ csrf_token }}">
 
     <fieldset>
@@ -62,20 +67,21 @@ $(document).ready(function() {
         <div id="braintree-container"></div>
     </fieldset>
 
-    <fieldset>
-        <legend>{{ _('Step 2 of 3') }}</legend>
+    <fieldset class="optional">
+        <legend>{{ _('Optional') }}</legend>
+
         <h2>{{ _('Who are you?') }}</h2>
 
         <div class="field">
             <label for="name">{{ _('Your Name') }}</label>
-            <input name="name" id="name" type="text" required>
+            <input name="name" id="name" type="text">
         </div>
 
         <div class="field email-address">
             <label for="email-address">{{ _('Your Email Address') }}</label>
-            <input name="email-address" id="email-address" type="text" required>
+            <input name="email_address" id="email-address" type="text">
             <p class="fine-print">
-                {{ _('You will get a verification link before we finalize your payment.') }}
+                {{ _('You will get a receipt for your payment.') }}
             </p>
         </div>
 
@@ -84,23 +90,23 @@ $(document).ready(function() {
                 <legend>{{ _('Follow-up') }}</legend>
 
                 <div class="fancy-radio">
-                    <input type="radio" name="follow-up" id="follow-up-monthly" value="monthly">
+                    <input type="radio" name="follow_up" id="follow-up-monthly" value="monthly">
                     <label for="follow-up-monthly">{{ _('Monthly') }}</label>
                 </div>
 
                 <div class="fancy-radio">
-                    <input type="radio" name="follow-up" id="follow-up-quarterly"
+                    <input type="radio" name="follow_up" id="follow-up-quarterly"
                            value="quarterly" checked>
                     <label for="follow-up-quarterly">{{ _('Quarterly') }}</label>
                 </div>
 
                 <div class="fancy-radio">
-                    <input type="radio" name="follow-up" id="follow-up-yearly" value="yearly">
+                    <input type="radio" name="follow_up" id="follow-up-yearly" value="yearly">
                     <label for="follow-up-yearly">{{ _('Yearly') }}</label>
                 </div>
 
                 <div class="fancy-radio">
-                    <input type="radio" name="follow-up" id="follow-up-never" value="never">
+                    <input type="radio" name="follow_up" id="follow-up-never" value="never">
                     <label for="follow-up-never">{{ _('Never') }}</label>
                 </div>
 
@@ -109,19 +115,6 @@ $(document).ready(function() {
                 </p>
             </fieldset>
         </div>
-    </fieldset>
-
-    <fieldset class="optional">
-        <legend>{{ _('Optional') }}</legend>
-        <h2>{{ _('Ecosystems') }}</h2>
-        <p class="fine-print">
-            {{ _('Which do you value most?{br}(JavaScript, Python, etc.)', br='<br>'|safe) }}
-        </p>
-
-        <div class="important-button ecosystem-chooser">
-            <button class="large">{{ _('Choose an Ecosystem') }}</button>
-        </div>
-        <div class="ecosystems"></div>
 
 
         <h2>{{ _('Promotion') }}</h2>
@@ -130,23 +123,24 @@ $(document).ready(function() {
             <p class="fine-print">{{  _('Thanks! We are excited to brag about you!') }}</p>
 
             <div class="field">
-                <label label="company">{{ _("Your Company Name") }}</label>
-                <input type="text" name="promote-name" id="promote-name">
+                <label for="promotion-name">{{ _("Your Company Name") }}</label>
+                <input type="text" name="promotion_name" id="promotion-name">
             </div>
 
             <div class="field">
-                <label label="company">{{ _("Your Landing Page URL") }}</label>
-                <input type="text" name="promote-url" id="promote-url">
+                <label for="promotion-url">{{ _("Your Landing Page URL") }}</label>
+                <input type="text" name="promotion_url" id="promotion-url">
             </div>
 
             <div class="field">
-                <label label="company">{{ _("Your Company Twitter Handle") }}</label>
-                <input type="text" name="promote-twitter" id="promote-twitter">
+                <label for="promotion-twitter">{{ _("Your Company Twitter Handle") }}</label>
+                <input type="text" name="promotion_twitter" id="promotion-twitter">
             </div>
 
             <div class="field">
-                <label label="company">{{ _("Your Message to the Open Source Community") }}</label>
-                <input type="text" name="promote-message" id="promote-message">
+                <label for="promotion-message">
+                    {{ _("Your Message to the Open Source Community") }}</label>
+                <input type="text" name="promotion_message" id="promotion-message">
             </div>
         </div>
 
@@ -157,18 +151,18 @@ $(document).ready(function() {
 
     </fieldset>
 
-    <fieldset>
+    <fieldset class="submit">
         <legend>{{ _('Submit Form') }}</legend>
 
         <div class="important-button">
-            <button type="submit" class="apply selected large">
+            <button type="submit" class="selected large">
                 {{ _("Pay for Open Source") }}
             </button>
         </div>
         <p class="fine-print">
-            {{ _( "By submitting this form you agree to our {0}terms of service{1}."
-                , '<a href="/about/policies/terms-of-service">'|safe
-                , '</a>'|safe
+            {{ _( "By submitting this form you agree to our {a}terms of service{_a}."
+                , a='<a href="/about/policies/terms-of-service">'|safe
+                , _a='</a>'|safe
                  ) }}
         </p>
     </fieldset>