diff --git a/routstr/lightning.py b/routstr/lightning.py
index cb3164bf..6ef85f3c 100644
--- a/routstr/lightning.py
+++ b/routstr/lightning.py
@@ -456,11 +456,20 @@ async def check_invoice_payment(
 
             mint_url = settlement.mint_url or settings.primary_mint
             wallet = await get_wallet(mint_url, "sat")
-            mint_status = await run_mint_operation(
-                lambda: wallet.get_mint_quote(settlement.payment_hash),
-                op_name="get_mint_quote",
-                mint_url=mint_url,
-            )
+            try:
+                mint_status = await run_mint_operation(
+                    lambda: wallet.get_mint_quote(settlement.payment_hash),
+                    op_name="get_mint_quote",
+                    mint_url=mint_url,
+                )
+            except Exception as error:
+                if not _is_quote_not_found(error):
+                    raise
+                logger.info(
+                    "Invoice quote no longer exists at mint, marking expired",
+                    extra={"invoice_id": invoice.id, "error": str(error)},
+                )
+                return True
             if not mint_status.paid:
                 return getattr(mint_status, "state", None) == MintQuoteState.unpaid
             payment_confirmed = True
@@ -575,6 +584,15 @@ async def check_invoice_payment(
             return False
 
 
+def _is_quote_not_found(error: BaseException) -> bool:
+    """Check if the error indicates the mint no longer has this quote."""
+    message = str(error)
+    return bool(
+        re.search(r"\bquote\s+not\s+found\b", message, re.IGNORECASE)
+        and re.search(r"\bcode\s*:?\s*0\b", message, re.IGNORECASE)
+    )
+
+
 def _is_outputs_already_signed(error: BaseException) -> bool:
     message = str(error)
     return bool(
diff --git a/tests/unit/test_lightning_settlement.py b/tests/unit/test_lightning_settlement.py
index 584950d6..958a5e19 100644
--- a/tests/unit/test_lightning_settlement.py
+++ b/tests/unit/test_lightning_settlement.py
@@ -149,6 +149,72 @@ async def test_invoice_mint_rejects_unrelated_concurrent_balance_growth() -> Non
         await _mint_invoice_quote(wallet, invoice)  # type: ignore[arg-type]
 
 
+@pytest.mark.asyncio
+async def test_quote_not_found_is_definitively_unpaid() -> None:
+    _invoice_settlement_locks.clear()
+    invoice = _invoice(status="pending", expires_at=0)
+    session = AsyncMock()
+    wallet = Mock(
+        get_mint_quote=AsyncMock(
+            side_effect=Exception("Mint Error: quote not found (Code: 0)")
+        )
+    )
+
+    with (
+        patch("routstr.lightning.get_wallet", AsyncMock(return_value=wallet)),
+        patch("routstr.lightning._reload_invoice_view", AsyncMock()),
+    ):
+        result = await check_invoice_payment(invoice, session)  # type: ignore[arg-type]
+
+    assert result is True
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    "message",
+    [
+        "Mint Error: quote not found (Code: 10000)",
+        "Mint Error: quote not found (Code: 01)",
+        "Mint Error: quote not found (Code: 0x10)",
+    ],
+)
+async def test_quote_not_found_without_exact_code_0_is_not_definitively_unpaid(
+    message: str,
+) -> None:
+    _invoice_settlement_locks.clear()
+    invoice = _invoice(status="pending", expires_at=0)
+    session = AsyncMock()
+    wallet = Mock(get_mint_quote=AsyncMock(side_effect=Exception(message)))
+
+    with (
+        patch("routstr.lightning.get_wallet", AsyncMock(return_value=wallet)),
+        patch("routstr.lightning._reload_invoice_view", AsyncMock()),
+    ):
+        result = await check_invoice_payment(invoice, session)  # type: ignore[arg-type]
+
+    assert result is False
+
+
+@pytest.mark.asyncio
+async def test_quote_not_found_case_insensitive() -> None:
+    _invoice_settlement_locks.clear()
+    invoice = _invoice(status="pending", expires_at=0)
+    session = AsyncMock()
+    wallet = Mock(
+        get_mint_quote=AsyncMock(
+            side_effect=Exception("MINT ERROR: Quote Not Found (code 0)")
+        )
+    )
+
+    with (
+        patch("routstr.lightning.get_wallet", AsyncMock(return_value=wallet)),
+        patch("routstr.lightning._reload_invoice_view", AsyncMock()),
+    ):
+        result = await check_invoice_payment(invoice, session)  # type: ignore[arg-type]
+
+    assert result is True
+
+
 @pytest.mark.asyncio
 async def test_non_pending_invoice_is_not_minted() -> None:
     _invoice_settlement_locks.clear()
@@ -194,6 +260,36 @@ async def test_ambiguous_invoice_mint_timeout_remains_recoverable() -> None:
     session.commit.assert_awaited_once()
 
 
+@pytest.mark.asyncio
+async def test_quote_not_found_after_payment_confirmation_is_not_unpaid() -> None:
+    _invoice_settlement_locks.clear()
+    invoice = _invoice()
+    session = AsyncMock()
+    wallet = Mock(get_mint_quote=AsyncMock(return_value=Mock(paid=True)))
+    state_session = AsyncMock()
+    state_session.exec.return_value.rowcount = 1
+
+    @asynccontextmanager
+    async def owned_session() -> AsyncIterator[AsyncMock]:
+        yield state_session
+
+    with (
+        patch("routstr.lightning.get_wallet", AsyncMock(return_value=wallet)),
+        patch("routstr.lightning.create_session", owned_session),
+        patch(
+            "routstr.lightning._mint_invoice_quote",
+            AsyncMock(
+                side_effect=Exception("Mint Error: quote not found (Code: 0)")
+            ),
+        ),
+        patch("routstr.lightning._reload_invoice_view", AsyncMock()),
+    ):
+        result = await check_invoice_payment(invoice, session)  # type: ignore[arg-type]
+
+    assert result is False
+    assert invoice.status == "settlement_pending"
+
+
 @pytest.mark.asyncio
 async def test_quote_lookup_timeout_is_not_definitively_unpaid() -> None:
     _invoice_settlement_locks.clear()