diff --git a/src/components/modals/budget-modal.tsx b/src/components/modals/budget-modal.tsx
index 2ec4d14..019c1c5 100644
--- a/src/components/modals/budget-modal.tsx
+++ b/src/components/modals/budget-modal.tsx
@@ -14,7 +14,7 @@ import { Button } from "@/components/ui/button"
 import { useModalStore } from "@/stores/modal-store"
 import { useUserStore } from "@/stores/user-store"
 import { isSphinx, hasWebLN, payInvoice, payL402, topUpLsat, topUpConfirm, fetchTransactionHistory, pollPaymentStatus, fetchBuyLsatChallenge, TransactionRow } from "@/lib/sphinx"
-import { getActionDisplayLabel, getActionBadgeColor } from "@/lib/transaction-display"
+import { getActionDisplayLabel, getActionBadgeColor, isViewGrantRow } from "@/lib/transaction-display"
 import { isMocksEnabled, MOCK_TRANSACTIONS } from "@/lib/mock-data"
 import { cookieStorage } from "@/lib/cookie-storage"
 import { api } from "@/lib/api"
@@ -45,7 +45,7 @@ export function BudgetModal() {
   const [paymentRequest, setPaymentRequest] = useState("")
   const [paymentHash, setPaymentHash] = useState("")
   const [copied, setCopied] = useState(false)
-  const intervalRef = useRef<ReturnType<typeof setInterval> | null>(null)
+  const pollAbortRef = useRef<AbortController | null>(null)
 
   // First-purchase state (non-Sphinx, non-WebLN, no existing L402)
   const [firstPurchaseAmount, setFirstPurchaseAmount] = useState<number>(1000)
@@ -63,8 +63,15 @@ export function BudgetModal() {
       ? budget.toLocaleString()
       : "--"
 
+  const cancelPoll = useCallback(() => {
+    pollAbortRef.current?.abort()
+    pollAbortRef.current = null
+    setLoading(false)
+    setError("")
+  }, [])
+
   const resetState = useCallback(() => {
-    if (intervalRef.current) clearInterval(intervalRef.current)
+    cancelPoll()
     setStep("balance")
     setAmount(null)
     setPaymentRequest("")
@@ -88,7 +95,7 @@ export function BudgetModal() {
 
   useEffect(() => {
     return () => {
-      if (intervalRef.current) clearInterval(intervalRef.current)
+      pollAbortRef.current?.abort()
     }
   }, [])
 
@@ -199,12 +206,15 @@ export function BudgetModal() {
     }
     setError("")
     setLoading(true)
+    const controller = new AbortController()
+    pollAbortRef.current = controller
     try {
       const challenge = await fetchBuyLsatChallenge(firstPurchaseAmount)
       setFirstPurchaseRequest(challenge.invoice)
       setStep("first-invoice")
 
-      const paid = await pollPaymentStatus(challenge.paymentHash)
+      const paid = await pollPaymentStatus(challenge.paymentHash, 20, 2000, controller.signal)
+      if (controller.signal.aborted) return
       if (!paid) {
         setError("Payment not detected. Try again.")
         setStep("first-purchase")
@@ -281,10 +291,12 @@ export function BudgetModal() {
       setPaymentHash(result.payment_hash)
       setStep("invoice")
 
+      const manualController = new AbortController()
+      pollAbortRef.current = manualController
       let confirming = false
-      const paid = await pollPaymentStatus(result.payment_hash, 100, 3000)
+      const paid = await pollPaymentStatus(result.payment_hash, 100, 3000, manualController.signal)
+      if (manualController.signal.aborted) return
       if (!paid) {
-        if (intervalRef.current) clearInterval(intervalRef.current)
         setError("Payment not detected. Try again.")
         setStep("amount")
         return
@@ -339,19 +351,22 @@ export function BudgetModal() {
           <DialogTitle className="font-heading text-lg tracking-wide flex items-center gap-2">
             {step !== "balance" && (
               <button
+                aria-label="Go back"
                 onClick={() => {
-                  if (step === "invoice" && intervalRef.current)
-                    clearInterval(intervalRef.current)
-                  if (step === "history" || step === "manage-token") {
+                  if (step === "first-invoice") {
+                    cancelPoll()
+                    setStep("first-purchase")
+                  } else if (step === "invoice") {
+                    cancelPoll()
+                    setPaymentRequest("")
+                    setStep("amount")
+                  } else if (step === "history" || step === "manage-token") {
                     setStep("balance")
                   } else if (step === "restore") {
                     setStep("manage-token")
-                  } else if (step === "first-invoice") {
-                    setStep("first-purchase")
                   } else {
-                    setStep(step === "invoice" ? "amount" : "balance")
+                    setStep(step === "amount" ? "balance" : "balance")
                     if (step === "amount") setAmount(null)
-                    if (step === "invoice") setPaymentRequest("")
                   }
                   setError("")
                 }}
@@ -662,7 +677,11 @@ export function BudgetModal() {
               ) : (
                 <div className="max-h-72 overflow-y-auto space-y-1 pr-1">
                   {transactions
-                    .filter(tx => tx.action !== 'refund' && tx.action !== 'boost_refund')
+                    .filter(tx =>
+                    tx.action !== 'refund' &&
+                    tx.action !== 'boost_refund' &&
+                    !isViewGrantRow(tx)
+                  )
                     .map((tx, i) => (
                     <div key={i} className="flex items-center justify-between rounded-md px-3 py-2 bg-muted/20">
                       <div className="flex items-center gap-2">
diff --git a/src/lib/__tests__/budget-modal.test.tsx b/src/lib/__tests__/budget-modal.test.tsx
index 1ae6dc9..46cd7ef 100644
--- a/src/lib/__tests__/budget-modal.test.tsx
+++ b/src/lib/__tests__/budget-modal.test.tsx
@@ -69,6 +69,9 @@ vi.mock("@/lib/mock-data", () => ({
 vi.mock("@/lib/transaction-display", () => ({
   getActionDisplayLabel: vi.fn((action: string) => action),
   getActionBadgeColor: vi.fn(() => ""),
+  isViewGrantRow: vi.fn((tx: { action: string; amount: number }) =>
+    tx.action === "purchase" && Number(tx.amount) === 0
+  ),
 }))
 
 // --- API mock ---
@@ -313,3 +316,151 @@ describe("BudgetModal Manage Token flow", () => {
     expect(cookieStorage.getItem("l402")).toBeNull()
   })
 })
+
+describe("BudgetModal back-nav poll cancellation", () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    mockBudget = 500
+    mockRefreshBalance.mockResolvedValue(undefined)
+    mockIsSphinx.mockReturnValue(false)
+    mockHasWebLN.mockReturnValue(false)
+    mockApiGet.mockReset()
+    cookieStorage.removeItem("l402")
+  })
+
+  it("clicking Back from first-invoice aborts the poll, resets loading, returns to first-purchase with no error", async () => {
+    // pollPaymentStatus never resolves unless signal is aborted
+    mockPollPaymentStatus.mockImplementation(
+      (_hash: string, _max: number, _interval: number, signal?: AbortSignal) =>
+        new Promise<boolean>((resolve) => {
+          if (signal) {
+            signal.addEventListener("abort", () => resolve(false))
+          }
+          // Never resolves on its own (simulates long poll)
+        })
+    )
+    mockFetchBuyLsatChallenge.mockResolvedValue({
+      invoice: "lnbcbuy999",
+      baseMacaroon: "mac999",
+      paymentHash: "hash999",
+      id: "lsat999",
+    })
+
+    render(<BudgetModal />)
+
+    // Start first-purchase flow
+    fireEvent.click(screen.getByText("Top Up"))
+    await waitFor(() => expect(screen.getByText("Get Started")).toBeInTheDocument())
+
+    fireEvent.click(screen.getByText("Generate Invoice"))
+
+    // Wait for first-invoice step (QR shown)
+    await waitFor(() => expect(screen.getByText("Pay Invoice")).toBeInTheDocument())
+
+    // Click Back — should abort poll and return to first-purchase
+    const backBtn = screen.getByRole("button", { name: "Go back" })
+    fireEvent.click(backBtn)
+
+    await waitFor(() => expect(screen.getByText("Get Started")).toBeInTheDocument())
+
+    // No error text
+    expect(screen.queryByText(/Payment not detected/)).not.toBeInTheDocument()
+    expect(screen.queryByText(/Processing/)).not.toBeInTheDocument()
+  })
+
+  it("clicking Back from invoice step aborts the poll and returns to amount step with no error", async () => {
+    // Set up existing L402 for manual QR flow
+    cookieStorage.setItem("l402", JSON.stringify({ macaroon: "mac123", preimage: "" }))
+    mockTopUpLsat.mockResolvedValue({ payment_request: "lnbctest456", payment_hash: "hash456" })
+
+    mockPollPaymentStatus.mockImplementation(
+      (_hash: string, _max: number, _interval: number, signal?: AbortSignal) =>
+        new Promise<boolean>((resolve) => {
+          if (signal) {
+            signal.addEventListener("abort", () => resolve(false))
+          }
+        })
+    )
+
+    render(<BudgetModal />)
+
+    // Navigate to amount step
+    fireEvent.click(screen.getByText("Top Up"))
+    await waitFor(() => expect(screen.getByPlaceholderText("Custom amount")).toBeInTheDocument())
+
+    // Select preset amount
+    fireEvent.click(screen.getByText("50"))
+
+    // Click Generate Invoice → goes to invoice step
+    fireEvent.click(screen.getByText("Generate Invoice"))
+
+    // Wait for invoice step
+    await waitFor(() => expect(screen.getByText("Pay Invoice")).toBeInTheDocument())
+
+    // Click Back
+    const backBtn = screen.getByRole("button", { name: "Go back" })
+    fireEvent.click(backBtn)
+
+    await waitFor(() => expect(screen.getByPlaceholderText("Custom amount")).toBeInTheDocument())
+
+    expect(screen.queryByText(/Payment not detected/)).not.toBeInTheDocument()
+    expect(screen.queryByText(/Processing/)).not.toBeInTheDocument()
+  })
+})
+
+describe("BudgetModal history view-grant filtering", () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    mockBudget = 500
+    mockRefreshBalance.mockResolvedValue(undefined)
+    mockIsSphinx.mockReturnValue(false)
+    mockHasWebLN.mockReturnValue(false)
+    mockApiGet.mockReset()
+    cookieStorage.setItem("l402", JSON.stringify({ macaroon: "mac123", preimage: "" }))
+  })
+
+  it("does not render zero-amount purchase (view-grant) rows in History", async () => {
+    mockFetchTransactionHistory.mockResolvedValue({
+      transactions: [
+        { action: "purchase", type: "debit", amount: 0, created_at: null },
+        { action: "top_up", type: "credit", amount: 500, created_at: null },
+      ],
+      scope: "token",
+    })
+
+    render(<BudgetModal />)
+
+    fireEvent.click(screen.getByText("History"))
+
+    await waitFor(() => {
+      expect(screen.getByText("top_up")).toBeInTheDocument()
+    })
+
+    // Zero-amount purchase should be filtered out
+    expect(screen.queryByText("-0 sats")).not.toBeInTheDocument()
+    // top_up row should be present
+    expect(screen.getByText("+500 sats")).toBeInTheDocument()
+  })
+
+  it("renders non-zero purchase rows in History", async () => {
+    mockFetchTransactionHistory.mockResolvedValue({
+      transactions: [
+        { action: "purchase", type: "debit", amount: 10, created_at: null },
+        { action: "purchase", type: "debit", amount: 0, created_at: null },
+      ],
+      scope: "token",
+    })
+
+    render(<BudgetModal />)
+
+    fireEvent.click(screen.getByText("History"))
+
+    await waitFor(() => {
+      // The non-zero purchase row should be visible
+      expect(screen.getByText("-10 sats")).toBeInTheDocument()
+    })
+
+    // The zero-amount purchase should NOT appear
+    expect(screen.queryByText("-0 sats")).not.toBeInTheDocument()
+  })
+})
diff --git a/src/lib/__tests__/transaction-display.test.ts b/src/lib/__tests__/transaction-display.test.ts
new file mode 100644
index 0000000..fae28ac
--- /dev/null
+++ b/src/lib/__tests__/transaction-display.test.ts
@@ -0,0 +1,32 @@
+import { describe, it, expect } from "vitest"
+import { isViewGrantRow } from "../transaction-display"
+
+describe("isViewGrantRow", () => {
+  it("returns true for a zero-amount purchase (view-grant row)", () => {
+    expect(isViewGrantRow({ action: "purchase", type: "debit", amount: 0 })).toBe(true)
+  })
+
+  it("returns false for a non-zero purchase", () => {
+    expect(isViewGrantRow({ action: "purchase", type: "debit", amount: 10 })).toBe(false)
+  })
+
+  it("returns false for a zero-amount top_up", () => {
+    expect(isViewGrantRow({ action: "top_up", type: "credit", amount: 0 })).toBe(false)
+  })
+
+  it("returns false for a zero-amount payout", () => {
+    expect(isViewGrantRow({ action: "payout", type: "credit", amount: 0 })).toBe(false)
+  })
+
+  it("returns false for a zero-amount boost", () => {
+    expect(isViewGrantRow({ action: "boost", type: "debit", amount: 0 })).toBe(false)
+  })
+
+  it("handles string amounts — returns true for '0' purchase", () => {
+    expect(isViewGrantRow({ action: "purchase", type: "debit", amount: "0" as unknown as number })).toBe(true)
+  })
+
+  it("handles string amounts — returns false for '10' purchase", () => {
+    expect(isViewGrantRow({ action: "purchase", type: "debit", amount: "10" as unknown as number })).toBe(false)
+  })
+})
diff --git a/src/lib/sphinx/payment.ts b/src/lib/sphinx/payment.ts
index b062875..b9ffc36 100644
--- a/src/lib/sphinx/payment.ts
+++ b/src/lib/sphinx/payment.ts
@@ -151,16 +151,23 @@ export async function topUpStatus(paymentHash: string): Promise<boolean> {
 export async function pollPaymentStatus(
   paymentHash: string,
   maxAttempts = 20,
-  intervalMs = 2000
+  intervalMs = 2000,
+  signal?: AbortSignal
 ): Promise<boolean> {
   for (let i = 0; i < maxAttempts; i++) {
+    if (signal?.aborted) return false
     try {
       const paid = await topUpStatus(paymentHash)
       if (paid) return true
     } catch {
       // status check failed — keep polling
     }
-    await new Promise((r) => setTimeout(r, intervalMs))
+    if (signal?.aborted) return false
+    // Abortable sleep — wakes immediately on cancel rather than waiting full intervalMs
+    await new Promise<void>((resolve) => {
+      const timer = setTimeout(resolve, intervalMs)
+      signal?.addEventListener('abort', () => { clearTimeout(timer); resolve() }, { once: true })
+    })
   }
   return false
 }
diff --git a/src/lib/transaction-display.ts b/src/lib/transaction-display.ts
index 5093c1e..e26596e 100644
--- a/src/lib/transaction-display.ts
+++ b/src/lib/transaction-display.ts
@@ -29,3 +29,18 @@ export function getActionDisplayLabel(action: string): string {
 export function getActionBadgeColor(action: string): string {
   return ACTION_BADGE_COLORS[action] ?? ACTION_BADGE_COLORS.other
 }
+
+export interface TransactionRow {
+  action: string
+  type: 'debit' | 'credit'
+  amount: number | string
+}
+
+/**
+ * Returns true for synthetic zero-amount purchase rows written by addNodeV2 /
+ * addContentV2 to grant submitters free re-access. These should not appear in
+ * the user-facing transaction history.
+ */
+export function isViewGrantRow(tx: TransactionRow): boolean {
+  return tx.action === 'purchase' && Number(tx.amount) === 0
+}