Daily caps are a standard part of any lead distribution agreement — buyers commit to a volume they can handle, and you commit not to send more. What separates mature lead distribution setups from fragile ones is what happens at the moment the cap is hit: does the router enforce it automatically, or does it rely on someone noticing?
There are two correct behaviors and several incorrect ones. Understanding them helps you configure the right fallback for each campaign.
Overflow mode: skip to the next eligible buyer
In overflow mode, when a buyer's cap is reached, the router marks them as ineligible for the rest of the reset window and evaluates the next buyer in priority order. If that buyer has capacity, the lead delivers there. If the next buyer is also capped, the router continues down the list. If no buyer has capacity, the lead either queues or goes to a designated fallback.
Overflow mode is the default for most agencies with 3+ buyers. It keeps lead flow alive without any manual intervention and prevents revenue loss from leads that would otherwise sit undelivered. The key requirement is that the router evaluates caps atomically — meaning two concurrent leads arriving in the same millisecond can't both slip past a cap of 1.
Pause mode: hold delivery until cap resets
In pause mode, once a buyer caps out, the router stops sending to that campaign entirely (or to that buyer specifically) until the cap window resets. Leads queue rather than overflow to another buyer.
Pause mode makes sense when a buyer is the only eligible recipient for a particular lead type and you'd rather hold leads than route them to a lower-priority fallback buyer who may not be a good fit. It also works for campaigns with a single exclusive buyer where no alternative exists. The risk is queue buildup — if a reset doesn't clear the queue fast enough, leads stack up and freshness degrades.
What happens without cap enforcement
Without a cap-aware router, one of two things happens: the leads keep delivering past the agreed cap (over-delivery), or someone manually monitors and pauses — which is impossible at real-time ingest volumes.
Over-delivery creates buyer disputes: buyers receive more leads than their team can work, quality perception drops, and refund requests follow. Buyers who feel over-delivered often reduce future commitments. Manual monitoring breaks as soon as ingest volume exceeds what one person can watch in real time — typically around 100 leads/day across 3+ buyers.
Spreadsheets and Zapier have no native cap concept. You can build a counter in Sheets and a conditional in Zapier, but concurrent lead arrivals race past it and the counter drifts under real load. This is one of the primary reasons agencies migrate off Zapier to dedicated routers.
Cap types: daily, weekly, monthly
Most buyers negotiate volume on a per-month basis, but daily caps protect their team from being flooded in a single day. The two work together: a buyer might accept 400 leads/month but cap at 20/day so their reps have a manageable inflow each morning.
Cap reset timing matters. A midnight UTC reset creates problems for buyers in different timezones — a US West Coast buyer's cap resets at 4 or 5 PM their time, not midnight. Per-buyer timezone-aware resets prevent this class of complaint.
| Tool | Native cap enforcement | Overflow routing | Weekly/monthly caps | Timezone-aware reset | Price |
|---|---|---|---|---|---|
| Zapier + Sheets | None native | None native | Manual only | No | $50-300/mo + tasks |
| LeadProsper | Yes (Pro+) | Yes (Pro+) | Yes | Yes | $499+/mo |
| LeadMove | Yes, all plans | Yes, configurable per campaign | Yes, daily + weekly + monthly | Yes | $149-499/mo |
| Boberdoo | Yes | Yes | Yes | Yes | $1,000+/mo |
Configuring cap overflow per campaign
The practical configuration is per-campaign: set overflow mode for campaigns with multiple buyers, pause mode for exclusive single-buyer campaigns. For overflow campaigns, rank buyers in priority order so overflow goes to your highest-capacity secondary buyer first. Add a catch-all fallback buyer or queue for leads that exhaust all priority slots.
LeadProsper supports cap overflow on Pro tiers ($499+/mo). LeadMove ($149/mo) ships daily, weekly, and monthly caps with configurable overflow-to-next-buyer or pause-and-queue behavior on every plan, timezone-aware per buyer. Boberdoo ($1,000+/mo) handles this in enterprise setups with more complex auction logic if needed.
Cap enforcement is one of those features that feels optional until you have your first over-delivery dispute — after which it becomes non-negotiable for every campaign you run.