Choosing a lead supplier: the criteria

By Camille Berthier7 min read · 19 August 2026

Choosing a lead supplier comes down to verifiable criteria, not to a pitch. Five points are enough to rule out most bad offers, and the questions whose answers tell you the most are rarely the ones on the sales deck.

The short answer

Traffic origin, real exclusivity, delivery time, proof of consent, replacement policy: those five decide.
Ask for numbers and wording, not adjectives. Exclusive as a word means nothing.
A refusal to show a sample of consent proof tells you more than any reference.
No supplier can guarantee your conversion rate, and one who offers to should worry you.
Five measurements on your first fifty records settle what no meeting can.

Choosing a lead supplier: the five criteria that decide

Everything else comes after these.

Traffic origin. A record from someone searching actively is not worth the same as one from a prize draw or a purchased file. It is the first question to ask, and how precisely it is answered is itself an indicator.

Real exclusivity. Not the promise, the number: how many buyers receive this record? In a semi exclusive model the exact figure belongs in the contract.

Delivery time. Measured in minutes between form submission and arrival with you, not described as real time.

Proof of consent. Wherever you call, this is what decides whether the call is lawful, and several markets have tightened it recently. It has to accompany every record with its date, wording and source.

Replacement policy. With a written definition of a non conforming record and a claim window. Without a definition, every dispute becomes a negotiation you will lose.

The questions to ask, and what the answers reveal

How you ask matters as much as what you ask. A closed question gets a yes; a precise question gets information.

Question	What a good answer contains
Where exactly do the records come from?	Named channels, and roughly how they split
How many buyers per record?	A number, not exclusive used as an adjective
What delivery time do you observe?	A duration, and the technical method used
What does the proof of consent contain?	Date, wording accepted, source, channels covered
What counts as a non conforming record?	A written list of cases
What volume is available on my territory?	A monthly order of magnitude, with seasonality
Is there a minimum term?	The exit conditions, not a spoken no

A vague answer to the first question deserves persistence. Multichannel acquisition often covers a mix whose least presentable part drags the average down.

Warning signs

Four situations justify caution without proving bad faith.

A price well below the sector. Producing a compliant record costs money. An unusually low figure is almost always explained by wide sharing, an aged record, or an origin that is not a voluntary enquiry.

A minimum term presented as a favour. A supplier confident in their quality does not need to lock in twelve months.

A refusal to produce consent proof. This is not administrative detail, it is what makes the call lawful or not.

A guarantee on your conversion rate. Nobody can guarantee the performance of your sales team. Such a promise signals either a misunderstanding of the business or a hidden escape clause.

What a supplier cannot guarantee

Knowing what is out of reach protects you from bad expectations as much as from bad providers.

Solvency is never guaranteed: a stated budget is not a financing decision. Nor is sincerity of intent, since some people compare without meaning to buy. And exclusivity covers resale of the record, not the prospect, who may have approached other companies independently.

These losses are normal and belong in the profitability calculation rather than in a promise. A supplier who raises them unprompted is usually a good sign.

Checking for yourself, in a week

No sales deck is worth five measurements taken on your first fifty records.

Answer rate after three attempts at different times of day. The least manipulable indicator there is.
Share outside your criteria, measured against your own eligibility rules.
Share who do not remember enquiring. Above a few per cent, the source is at fault.
Real delivery time, comparing the timestamp of the request with that of receipt.
Presence of consent proof on every line, not on a sample.

Those five figures settle in days what no commercial conversation can.

Delivery method, the decisive technical point

The best record on the market loses its value if it arrives late or in an unusable format. Four arrangements exist, and they are far from equivalent.

A webhook into your CRM is the most responsive: seconds, timestamped. An API achieves the same with more integration work. A connector suits a team with no technical resource, at the cost of minutes. A file sent in batches is incompatible with fast follow up, since the record arrives already cold.

A supplier who only offers files is structurally selling aged records, whatever the qualification upstream.

Weighting the criteria for your sector

The five criteria stay; their weighting changes.

Where the sale closes on the phone, as with remote monitoring or health insurance, delivery time and exclusivity dominate: the first caller wins.

Where a technical visit is required, as with solar panels or roofing, precision of qualification comes first, because one wasted trip costs more than several records.

Where financing or regulation is involved, the supplier's ability to check the prospect's situation upstream prevents a wall of refusals at the end of the cycle.

Changing supplier without breaking your flow

The question arises eventually, and it is handled badly when it is handled in a hurry after a bad run.

Three precautions avoid a gap in activity. Never cut before measuring the replacement on a readable volume: a month of overlap costs less than a month without flow. Keep your history of indicators by source, or you lose the baseline that lets you judge the new one. And check what happens to the data on exit: records already paid for should remain usable by you, within your retention period.

One technical detail is often forgotten. If delivery runs through a webhook, the old flow has to be switched off at the supplier's end and not only at your CRM, otherwise records keep arriving and being invoiced.

Frequently asked questions

Should you commit to volume for a better price?

Be careful with this assumption: in this business, asking for more volume generally pushes the cost per record up, not down. The reason is mechanical, since the cheapest advertising inventory runs out quickly and additional volume means widening the territory or bidding higher. The volume discount reflex comes from selling physical goods, where marginal cost falls. Here it rises. As for a minimum term, it protects the supplier against your dissatisfaction, nothing more.

How can you tell whether a record was really sold exclusively?

Three signals betray it: the prospect says they have already been called, refusals cluster in the minutes after delivery, or the price sits well below the sector. None is proof on its own; together they are.

Should a supplier accept a trial?

Yes, and a refusal is itself an answer. The trial needs enough volume to be readable, thirty to fifty records, with success criteria fixed before it starts.

Can a supplier work under your own brand?

It is common practice, usually called white label: the forms carry your brand, which improves recognition when you call. It requires the information notice to name the receiving company, otherwise the consent obtained does not cover your call.

What should the contract say about personal data?

The allocation of roles between controller and processor under the GDPR, the retention period, and what happens to the data when the relationship ends. If a supervisory authority looks into a complaint, the absence of a clause pushes responsibility towards whoever works the contacts.

Going further

The full framework is in buying qualified leads. On price ranges, see what a qualified lead costs. On what qualified means, qualified lead, definition and criteria.