A 32-inch 4K panel in Singapore still jumps S$80–S$200 on sale days. Brand pages lag. Agent-readable prices do not.
This is a 40-line watcher that queries BuyWhere's MCP, filters SGD 4K monitors, and prints a ranked table. Pair it with the live comparison pages — they now render /r/ merchant links again (probed 2026-09-01):
- Best 4K monitors in Singapore — BenQ MA270UP, PV3200U, AORUS FO32U live
- Best budget TVs in the US
Why MCP, not six retailer APIs
Shopee, Lazada, Amazon, and local electronics shops do not share a schema. BuyWhere's MCP (search_products) returns price.amount + price.currency nested under price. Always read it nested:
cur = item.get("price", {}).get("currency")
amt = item.get("price", {}).get("amount")
If you flatten those fields you will silently drop SGD rows. That is the #1 integration bug we see.
Install
pip install mcp
# or call the HTTP catalog:
# GET https://buywhere.ai/api/search?country=SG&query=4k%20monitor
Watcher
import json, urllib.parse, urllib.request
def search(q, country="SG"):
url = "https://buywhere.ai/api/search?" + urllib.parse.urlencode({"country": country, "query": q})
req = urllib.request.Request(url, headers={"User-Agent": "4k-monitor-watcher/1.0", "Accept": "application/json"})
with urllib.request.urlopen(req, timeout=20) as r:
data = json.loads(r.read())
return data if isinstance(data, list) else data.get("data") or data.get("results") or []
def priced(items):
out = []
for x in items:
p = x.get("price") or {}
if isinstance(p, dict) and p.get("currency") == "SGD" and p.get("amount"):
out.append((float(p["amount"]), x.get("title") or x.get("name"), p["currency"]))
return sorted(out, key=lambda t: t[0])[:8]
for q in ("4k monitor", "4k oled monitor", "27 4k ips"):
rows = priced(search(q))
print(f"\n== {q} ({len(rows)} SGD-priced) ==")
for amt, title, cur in rows:
print(f" {cur} {amt:8.2f} {title[:70]}")
Run it on a cron. When a SKU drops below your threshold, post to Slack / Telegram (see last week's bot: Dev.to 4545487).
What the live page already does for you
https://buywhere.ai/best-4k-monitors-singapore is an intent page: current-year title, product cards, /r/direct/{id} merchant hops (never raw merchant URLs), and an MCP snippet on the page. Use it as the human-readable counterpart of this watcher. Do not scrape the HTML for prices — call the search API.
Caveats (honest)
- Catalog coverage flaps. A query that returns 20 hits at 15:00Z can return 0 at 16:00Z. Retry with
backupQueries. - Currency is nested. US pages can leak USD into an SG search; filter
currency == "SGD". - Affiliate clicks only fire if the product card rendered a
/r/href. If a page shows an empty state, the watcher still works — the HTML page is the SEO surface, the API is the agent surface.
Next
Wire this into Claude Desktop / Cursor via the BuyWhere MCP listing on Smithery. Tool name: search_products.
Questions: open an issue on BuyWhere/buywhere-mcp.
