Duplicate Lead Checking: What Counts, Which Window, and Who Decides

What counts as a duplicate

Every duplicate rule answers four questions. Decide each one on purpose, because the defaults in most setups are either too loose, so buyers pay twice, or too strict, so you throw away leads that were real new requests.

Matching on address alone is the right call when one person can legitimately submit for more than one property, as in real estate, where an owner may want offers on several houses. A phone or email match would block the second property even though it is a new lead. The reverse holds for most consumer services, where the person is the lead and the address adds little.

The words matter too. Several companies in our directory accept only an "exact" or "true" duplicate without saying what makes one exact. Does a new email with the same phone count? A typo in the last name? If your policy says "true duplicate", define it as a field match, or every return becomes a negotiation.

Rules can also differ by source. Your own forms produce repeats from people who submitted twice by accident or came back later. Outside vendors can resubmit a lead they already sold you, or one they sold elsewhere. A sensible approach is to match vendor leads on phone, email and address, and your own leads on fewer fields, so vendor traffic gets the strictest check.

How lead companies write duplicates into their return terms

224 of the 440 companies in our pay-per-lead directory publish return terms of some kind. Duplicates show up in 65 of them, alongside disconnected numbers, fake submissions and out-of-area leads. Outcome reasons, such as a prospect who chose a competitor or did not buy, are the ones companies usually decline. The table shows how those 65 define the duplicate.

Reading the terms closely turns up patterns worth copying, and a few worth avoiding:

• Most leave the window out. Of the 65 that accept duplicate returns, most do not say how far back the match reaches. Without a window, any repeat ever received could be returned, and a buyer and seller can disagree honestly.
• Windows vary a lot by market. Where a window is stated, the longest belong to companies selling motivated seller leads, where an owner may come back months later. Shorter windows are common in insurance and home services, where people request quotes and decide fast.
• Several limit duplicates to their own sales. These companies credit a duplicate only when it repeats a lead they sold the same buyer. One says outright that it will not credit a duplicate if the buyer got the original from an outside source. That is a fair rule for a seller, as long as it is written down.
• A few narrow the scope further. A few count only duplicates within the same order or billing cycle. A few count only duplicates in the same lead type or task category, so a second request for a different service is a new, billable lead.
• Several call sellers do not bill duplicates at all. Instead of a return, a repeat call inside the window is simply not billable. The same idea works for web leads: catch the duplicate before delivery and the return never happens.
• Credits, not cash. Most of the 65 describe a credit to the account or a replacement lead, and several say outright that refunds are not paid in cash. A few also cap how large a share of a buyer's leads can be returned.

Only a few companies in our directory answer "how are duplicates handled?" in their own FAQs, while 64 answer questions about returns, refunds or bad leads. Buyers ask it on the first call anyway. Have the answer ready, and put it in writing before the first lead. Our lead return policy guide includes a template.

Checking before delivery: what sellers say they screen

A return fixes a duplicate after the buyer has paid. A check before delivery stops it from being sold. 39 companies in our directory list duplicate checks, duplicate removal or duplicate suppression among their quality claims. They describe it in a few different ways:

• Inside one seller's own stream. The most common claim: the seller checks a new lead against leads it has already received or delivered, usually on phone, email or both. One describes matching on phone or email within the same category and a set window.
• Across a whole network. A few networks say they deduplicate across every seller and buyer on the network, not only per buyer. That catches a person who filled out forms on two different sites.
• Blocked at the form. One company says it blocks a second submission from the same browser session, which stops accidental double clicks before they ever become two leads.
• As one step in a quality stack. Many list de-duplication next to phone validation, email checks, IP and geography checks and bot or fraud scoring. In those claims, duplicates are rarely defined further than the word.

When you buy from a vendor, a claim of "duplicate checks" tells you little. Ask four things: which fields they match on, against what history, over what window, and whether the check runs per buyer or across everything they sell. Our list of questions to ask a lead vendor covers the rest.

Duplicates across trades and lead types

Multi-trade sellers, especially in home services and insurance, see the same person ask for more than one thing. Someone who wants a roofing quote may also want gutters or windows. Someone shopping for auto insurance may also want a home policy. Treating every repeat phone number as a duplicate throws those leads away.

The cleaner rule is to check duplicates within a lead type. A second request in the same lead type, inside your window, is a duplicate. A request in a different lead type is a new lead and can be routed to that trade's buyers. A few companies in our directory write exactly this into their return terms, crediting a duplicate only within the same lead type or task category.

Two cautions. First, tell your buyers how you define it, because a buyer who takes both roofing and gutters may see the same name twice and ask for a return. Second, decide whether an earlier lead that went unsold changes anything. If the first request never reached a buyer, the second one may be the first lead anyone pays for.

Aged and resold leads need their own rule. A lead sold again after its first sale is a repeat by design, so a duplicate rule there is about the same buyer, not the same person. One company in our directory adds every purchase to the buyer's own suppression list so that buyer can never buy the same lead twice. Another accepts returns on aged leads only for duplicates or a filter mismatch. If you sell aged inventory, say whether a buyer can be offered a lead they already own.

Suppression lists: leads you should never send

A duplicate check compares a lead with your own past leads. A suppression list compares it with a list someone else gives you, or one you keep for a reason other than repeats. 24 companies in our directory mention suppression lists. There are three kinds you are likely to meet.

1. The buyer's existing customers and leads

   A buyer does not want to pay for someone already in their CRM. A few companies in our directory let buyers supply their own list to suppress against, in one case uploaded as hashed values so the raw contacts are never shared. Agree how often the list is refreshed, and who carries the cost if a match slips through before the next refresh.

2. Your own do-not-sell list

   Keep a list of contacts you have decided never to sell again: people who asked to be removed, known test or fake entries, and leads returned as fraud. Check new leads against it before they are routed, and remove those contacts from any marketplace or subscription pool too. Several companies in our directory put this duty on their trading partners in writing, requiring buyers or suppliers to honor opt-out requests and keep their own suppression lists.

3. Do-not-call lists

   Several companies in our directory say they scrub or screen leads against do-not-call lists before delivery, and some others say that screening is the buyer's job. This page does not describe what the rules require. They are published by the FCC and the FTC, and TCPAWorld tracks how they are changing. Take advice on your own setup.

If you buy from publishers: duplicates on the supply side

Brokers sit on both sides of a duplicate. A buyer can return a duplicate to you, and you need to be able to push that back to the source that sent it. Of the companies in our directory that buy from publishers or affiliates, only one says in its publisher terms that duplicates are not payable, and a few others say they pay nothing for leads that are rejected or later returned, offsetting credits against payouts.

That gap is where a broker loses money: the buyer gets a credit, but the publisher was already paid. Close it before the first vendor lead arrives.

• Give every vendor its own source and keep a source sub ID on every lead, so a duplicate can always be traced.
• Check vendor leads at submission, against your full history, before they are routed or paid.
• Write duplicates into the vendor agreement: duplicates are not payable, and a lead returned as a duplicate is deducted from the next payout.
• Watch duplicate rates by source. A vendor whose leads keep matching your history is either reselling or recycling. Tighten the rule for that source, or stop buying from it.

Our guide on how to broker leads covers vendor terms in more depth.

Setting your duplicate rules

1. Choose the match fields per lead type

   Decide whether a duplicate is a phone match, an email match, an address match, or a combination. Use address where one person can submit for several properties, and phone or email where the person is the lead.

2. Set a lookback window

   Pick a window long enough to protect buyers from paying twice and short enough to let real new requests through. Match it to how long people in your market take to decide, and use the same window for checks and returns.

3. Set stricter rules for vendor sources

   Give each vendor its own source and check its leads on every field you have. Keep a source sub ID on every lead so a duplicate can always be traced back.

4. Load the suppression lists you have

   Collect any existing-customer lists your buyers give you and keep your own do-not-sell list. Agree with each buyer how often their list is refreshed. These checks run outside Juiced, before leads are posted.

5. Put the rule in your return policy

   State which fields count, the window, whether the match is against your sales or the buyer's own leads, and whether duplicates across lead types are returnable. Send it to every buyer before they fund, and walk through it on the first call.

6. Review duplicates that get through

   When a duplicate return is approved, find the source and the rule it slipped past. Tighten the rule for that source, deduct it from the vendor's payout, or stop buying from it.

How Juiced handles duplicates

Juiced builds duplicate handling into the points where a lead enters and moves through the system.

• At the ping. When a source sends a ping, repeat submissions are caught at the ping stage, before the full lead is posted. See what is ping post.
• At submission, per source. Each vendor gets its own source, and the duplicate rules you set run at submission time, so vendor traffic can be checked more strictly than your own forms. See managing lead vendors.
• Audit holds. Leads that need a closer look are held for review, then released or rejected from the log, so a questionable lead is not delivered before anyone has seen it.
• Logged and linked. Every submission is logged with its source, outcome and sale price, and linked to any later return, so a duplicate return points straight to the source that sent it. Vendor payouts are tracked per lead.
• Returns credited to the wallet. Buyers fund a wallet before leads arrive, and approved returns are credited back to it.

What Juiced does not do: it has no scrubbing or compliance tooling, and it does not check leads against do-not-call or other outside lists. If you or your buyers need that screening, it happens before the lead reaches Juiced or in a separate service.

Frequently asked