diff --git a/ui/src/components/lead-forms/TopUpModal.tsx b/ui/src/components/lead-forms/TopUpModal.tsx
new file mode 100644
index 00000000..b574ee45
--- /dev/null
+++ b/ui/src/components/lead-forms/TopUpModal.tsx
@@ -0,0 +1,188 @@
+"use client";
+
+import { useState } from "react";
+import { toast } from "sonner";
+
+import { Button } from "@/components/ui/button";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+
+import { validateWorkEmail } from "./isPersonalEmail";
+import {
+  TOPUP_COMPANY_SIZE_OPTIONS,
+  TOPUP_VOLUME_OPTIONS,
+  VOLUME_PRICING_GATE,
+  type LeadSource,
+} from "./leadFieldOptions";
+import { MathCaptcha } from "./MathCaptcha";
+import { submitLead } from "./submitLead";
+
+interface TopUpModalProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+  source: LeadSource;
+  onOpenEnterprise: () => void;
+}
+
+export function TopUpModal({ open, onOpenChange, source, onOpenEnterprise }: TopUpModalProps) {
+  const [credits, setCredits] = useState("");
+  const [useCase, setUseCase] = useState("");
+  const [volume, setVolume] = useState("");
+  const [workEmail, setWorkEmail] = useState("");
+  const [company, setCompany] = useState("");
+  const [companySize, setCompanySize] = useState("");
+  const [emailError, setEmailError] = useState<string | null>(null);
+  const [captchaValid, setCaptchaValid] = useState(false);
+  const [submitting, setSubmitting] = useState(false);
+
+  const wantsVolumePricing = volume === VOLUME_PRICING_GATE;
+
+  const reset = () => {
+    setCredits(""); setUseCase(""); setVolume(""); setWorkEmail("");
+    setCompany(""); setCompanySize(""); setEmailError(null);
+    setCaptchaValid(false); setSubmitting(false);
+  };
+
+  const handleSubmit = async () => {
+    if (!credits.trim() || !useCase.trim() || !volume) {
+      toast.error("Please fill in all required fields");
+      return;
+    }
+    if (wantsVolumePricing) {
+      const err = validateWorkEmail(workEmail);
+      if (err) { setEmailError(err); return; }
+      if (!company.trim() || !companySize) {
+        toast.error("Please complete the volume-pricing details");
+        return;
+      }
+    }
+    if (!captchaValid) { toast.error("Please answer the quick check"); return; }
+
+    setSubmitting(true);
+    try {
+      await submitLead({
+        kind: "topup",
+        source,
+        payload: {
+          credits, useCase, volume, wantsVolumePricing,
+          ...(wantsVolumePricing ? { workEmail, company, companySize } : {}),
+        },
+      });
+      toast.success("Thanks — we'll get your top-up sorted shortly.");
+      reset();
+      onOpenChange(false);
+    } catch {
+      toast.error("Something went wrong. Please try again.");
+      setSubmitting(false);
+    }
+  };
+
+  return (
+    <Dialog open={open} onOpenChange={(o) => { if (!o) reset(); onOpenChange(o); }}>
+      <DialogContent className="max-w-md">
+        <DialogHeader>
+          <DialogTitle>Request a credit top-up</DialogTitle>
+          <DialogDescription>
+            Tell us how many credits you need and we&apos;ll sort you out.
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="grid gap-4 py-2">
+          <div className="space-y-1.5">
+            <Label htmlFor="topup-credits">How many credits?</Label>
+            <Input
+              id="topup-credits"
+              inputMode="numeric"
+              value={credits}
+              onChange={(e) => setCredits(e.target.value)}
+              placeholder="e.g. 5000"
+            />
+          </div>
+
+          <div className="space-y-1.5">
+            <Label htmlFor="topup-usecase">What&apos;s the use case?</Label>
+            <Input id="topup-usecase" value={useCase} onChange={(e) => setUseCase(e.target.value)} />
+          </div>
+
+          <div className="space-y-1.5">
+            <Label>Expected monthly call volume</Label>
+            <Select value={volume} onValueChange={setVolume}>
+              <SelectTrigger><SelectValue placeholder="Select volume" /></SelectTrigger>
+              <SelectContent>
+                {TOPUP_VOLUME_OPTIONS.map((o) => (
+                  <SelectItem key={o.value} value={o.value}>{o.label}</SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </div>
+
+          {wantsVolumePricing && (
+            <div className="space-y-3 rounded-md border-l-2 border-primary bg-muted/40 p-3">
+              <p className="text-sm font-medium text-primary">Talk to us about volume pricing</p>
+
+              <div className="space-y-1.5">
+                <Label htmlFor="topup-email">Work email</Label>
+                <Input
+                  id="topup-email"
+                  type="email"
+                  value={workEmail}
+                  onChange={(e) => { setWorkEmail(e.target.value); setEmailError(null); }}
+                  placeholder="you@company.com"
+                />
+                {emailError && <p className="text-sm text-destructive">{emailError}</p>}
+              </div>
+
+              <div className="space-y-1.5">
+                <Label htmlFor="topup-company">Company name</Label>
+                <Input id="topup-company" value={company} onChange={(e) => setCompany(e.target.value)} />
+              </div>
+
+              <div className="space-y-1.5">
+                <Label>Company size</Label>
+                <Select value={companySize} onValueChange={setCompanySize}>
+                  <SelectTrigger><SelectValue placeholder="Select size" /></SelectTrigger>
+                  <SelectContent>
+                    {TOPUP_COMPANY_SIZE_OPTIONS.map((o) => (
+                      <SelectItem key={o.value} value={o.value}>{o.label}</SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
+              </div>
+
+              <button
+                type="button"
+                onClick={onOpenEnterprise}
+                className="text-sm text-muted-foreground underline decoration-dashed underline-offset-4 hover:text-foreground"
+              >
+                Need enterprise deployment? (SSO, on-prem, SOC2, data residency)
+              </button>
+            </div>
+          )}
+
+          <MathCaptcha id="topup-captcha" onValidChange={setCaptchaValid} />
+        </div>
+
+        <div className="flex justify-end gap-2">
+          <Button variant="outline" onClick={() => onOpenChange(false)}>Cancel</Button>
+          <Button onClick={handleSubmit} disabled={submitting}>
+            {submitting ? "Submitting…" : "Submit request"}
+          </Button>
+        </div>
+      </DialogContent>
+    </Dialog>
+  );
+}