Any tool that says it watches Facebook Marketplace in real time is describing a feeling, not a system. Under every monitoring service is a schedule, and the honest question is not "is it real time?" but "how long between a listing going live and the check that finds it?"
We would rather explain our schedule than let you imagine one. Here is exactly what Crawlbench's crawl cadence means for the city you buy in.
The scenario that makes timing matter
A clean truck posts at 9:07 on a Tuesday morning, priced a few thousand under market. In a competitive metro, that listing collects its first "Is this available?" within the hour. Whether you were the first message or the fifteenth mostly comes down to when you learned it existed.
Facebook's own saved-search notifications are built for re-engagement, not latency, so serious buyers end up asking the timing question about whatever tool they use instead. Fair. Here is our answer.
The mechanism, without the hand-waving
Crawlbench runs a scheduled fan-out every 10 minutes. Each cycle, the scheduler walks your active monitors and dispatches crawls for the ones due to run. Each individual monitor checks in on a scan cadence of about 20 minutes, uniform across paid plans.
Where your monitor looks each time it runs depends on how you scoped it:
- Single city. Every run checks your city's newest listings. Worst case, a listing posts right after a check and waits roughly one cadence interval to be seen. In practice, detection lag for a single-city monitor is measured in minutes to tens of minutes, not hours.
- A handful of chosen cities. Same story, each of your cities is checked on each run.
- Nationwide. Here rotation kicks in, and this is the part most tools do not explain. The US catalog covers 86 anchor metros. A nationwide monitor crawls a batch of them per cycle, sized by your plan's city slots (3 on Starter, 20 on Pro), and rotates the batch each cycle so coverage spreads across the whole catalog instead of hammering the same places. Any single metro is visited on rotation, not every cycle.
So "10-minute schedule" is true and also not the number you care about. The number you care about is time-to-detection for your city, and that depends on scope: tight for a single-city monitor, longer and rotation-dependent for nationwide.
Once a listing is detected, the rest is fast. It gates through your filters (price, year, excluded terms, and a recency window that defaults to listings posted in the last 2 days), and a passing match alerts you within minutes, with the reasons it passed attached (how the pipeline works).
What this means if you are the buyer
- Scope is a latency decision, not just a coverage decision. If you buy in one metro, a single-city monitor is your fastest configuration. Nationwide is for sourcing breadth, where you accept rotation lag in exchange for 86 metros of reach.
- Cadence beats notification luck. A check every 20 minutes with strict filters will beat waiting for a saved-search push that batches with the rest of your Facebook notifications. Not because the interval is magic, but because it is guaranteed to happen.
- The floor matters more than the average. Manual checking has great latency while you are staring at the feed and infinite latency while you are asleep, driving, or in a meeting. A schedule's worst case is bounded. Willpower's is not.
What to do with this on Monday morning
If you run a monitor anywhere, on Crawlbench or elsewhere, ask it three questions. What is the check interval for my exact city? Does coverage rotate, and if so, how often does my metro come up? What happens between detection and my phone buzzing?
If the vendor cannot answer with numbers, assume the numbers are worse than yours need to be. And if you buy in one city, scope your monitor to that city. It is the single cheapest latency win available.
The honest close
Nobody crawls every US metro every minute, including us. What we commit to is a fixed schedule, filters that keep alerts worth opening, and alerts that fire minutes after detection. For a buyer whose edge lives in the first hour of a listing's life, bounded and predictable beats "real time" as a promise.
If you want to see what the cadence looks like against your own buy box, pricing starts with a no-card Day Pass that runs the full pipeline for 24 hours.