How to choose an influencer marketing agency in 2026

Key takeaways

A good agency starts with an audit and KPIs, not with a list of creators.
Compare at least three agencies with the same grid: method, industry proof, creator selection, paid media, reporting and cost transparency.
Agency fees usually run at 15 to 30% of the managed budget; a credible test starts at around €10,000 to €15,000.

6 criteria to evaluate an influencer marketing agency

Tools have made access to creators almost universal. What sets an agency apart today is the quality of its thinking and its ability to prove results. Six criteria help you sort the field.

1. An audit and data before any recommendation

An agency that pitches influencer names in the first meeting is working blind. The first step should be an audit: your audiences, your competitors, the platforms where your category plays out. Analytics tools then check each profile’s engagement rate, audience location and share of fake followers.

2. KPIs and an ROI framework set at the brief

Awareness, consideration, traffic, leads, sales or reusable content: the objective drives the choice of creators, formats and metrics. ROI is not an appendix to the report, it is part of the framing. Ask which KPIs the agency proposes for your goal and how it will measure them.

3. Independence from creators

A talent agency represents influencers and looks for deals for them. A strategic agency works for the brand and selects profiles across the whole market, without a conflict of interest. Be wary of an agency that only offers creators from its own roster.

4. Paid media and usage rights

Relying on organic reach alone limits a campaign’s impact. A strong agency secures usage rights to amplify creator content as ads (Spark Ads on TikTok, partnership ads on Instagram, whitelisting) with conversion tracking through pixels and UTMs.

5. Proof of results in your industry

Beautiful visuals prove nothing. Ask for case studies with numbers, ideally in your industry or on a comparable challenge: reach, engagement, cost per thousand, conversions, sales. A serious agency will also explain what did not work and what it learned.

6. Transparent costs and reporting

Ask to see creator fees separated from agency fees. Reporting should be clear, regular and tied to your objectives, not limited to views and likes.

Strategic, creative, talent agency or platform: which model to choose?

The influencer market includes several models. Each can be the right fit, but none covers every need. Before comparing agencies, identify the type of partner that matches your goal.

Model	Best for	Limits
Strategic agency	Campaigns tied to a business goal, multi-platform or multi-market	Needs enough budget to justify the audit and steering
Creative agency	Content production with high aesthetic standards	ROI measurement and data-led selection are often partial
Talent agency	Fast access to a network of known creators	Selection limited to the roster, risk of conflict of interest
Influencer platform	Trained in-house teams, volume, gifting	No strategy or steering: your team does the work

For more on the last option, read our comparison influencer marketing agency or influencer platform.

How to compare several agencies: the scoring grid

Comparing agencies on price alone is a classic mistake. A cheaper offer can cost more in the end if it structures neither the framing, nor the selection, nor the reporting. Brief at least three agencies the same way, score each criterion from 1 to 5 and apply the weights below.

Criterion	Weight	What to check
Method and audit	20%	Diagnosis before the recommendation, targeting logic
Industry proof	20%	Case studies with numbers in your industry or on a comparable challenge
Creator selection	15%	Data criteria, fake-follower checks, independent casting
Paid media and rights	15%	Planned amplification, usage rights included in contracts
Reporting and measurement	15%	KPIs tied to the goal, reporting frequency and a sample report
Cost transparency	10%	Creator fees separated from agency fees, payment terms
Team and relationship	5%	Dedicated contact, responsiveness, knowledge of your brand

How much does an influencer marketing agency cost?

In 2026, an influencer marketing campaign in France costs from €10,000 for a seeding program to more than €500,000 for an international, multi-market rollout. Agency fees usually represent 15 to 30% of the managed budget, and a single post costs between €50 and €50,000 depending on the creator’s tier.

A credible test starts at around €10,000 to €15,000: targeted seeding or a pilot campaign with a few creators. To compare two quotes, the right question is not “how much does the agency cost?” but “what does this quote actually include?”: strategy, selection, negotiation, usage rights, production, amplification and reporting.

See the full breakdown: influencer marketing agency pricing and quotes →

Questions to ask an influencer marketing agency in the first meeting

The first conversation is often enough to tell a methodical agency from an opportunistic one. Ask every candidate these questions and compare the answers.

What diagnosis do you run before recommending creators?
Which KPIs do you propose for our goal, and how do you measure them?
How do you select creators, and do you work with an exclusive roster?
Can you show a case study with numbers that is close to our challenge?
Are content usage rights included in your contracts, for how long and on which channels?
How do you separate creator fees from your own fees in the quote?
Who will be our day-to-day contact, and how often will we get a report?

Red flags before you sign

Guaranteed virality: nobody can guarantee a million views. A serious agency commits to a program, a cost per thousand or measurable objectives.
Opaque margins: if the agency refuses to separate creator fees from its own, you cannot compare offers.
No transfer of rights: without usage rights, you can neither reuse the content nor amplify it as ads.
Imposed casting: selection limited to the agency’s roster serves its creators before your brand.
Surface-level reporting: views and likes with no link to the stated objective.
No ad disclosure planned: in France, the influencer law requires a “publicité” or “collaboration commerciale” label on every paid post, and other markets have equivalent rules.

What an agency should be able to show you: examples of results

This is the level of proof to expect from an agency: results with numbers, tied to an objective. Four campaigns run by TANKE, as examples.

BFGoodrich, KO3 tire launch: more than 2.5 million people reached, a 7.4% engagement rate on reach and 122 pieces of content, with an audience that was 82% off-road enthusiasts.
IKKS, 2024-2025 capsule collaboration: more than 12.4 million impressions, +22% revenue in the capsule category, and micro-influencers converting three times better than celebrities.
Airalo, eSIM 2024: more than 3,200 new purchases, 45,000 link clicks and a 12% drop in customer acquisition cost.
La Poste, Digital Stamp: a 738% marketing ROI (MROI) and +78% revenue for the service in August 2025, a campaign awarded the Grand Prix de l’Influence (Silver, 2025).

See all our case studies →

Why brands choose TANKE

Since 2014, TANKE has been a 100% independent influencer marketing agency in Paris. Our method follows the criteria in this guide: strategic diagnosis, influence architecture, creator selection across the whole market, paid media amplification and reporting tied to your objectives, in France and internationally.

Our campaigns have won the Grand Prix Stratégies du Luxe (Gold, 2018, Gucci), the Cas d’Or du Social Media (2025, BFGoodrich) and the Grand Prix de l’Influence (Silver, 2025, La Poste), and TANKE holds an EcoVadis Gold medal.

Frequently asked questions

How do you choose an influencer marketing agency?

To choose an influencer marketing agency, brief at least three agencies the same way and compare their method: an audit before any recommendation, KPIs tied to your goal, independent creator selection, paid media and usage rights, case studies with numbers and transparent costs. Score each criterion on a weighted grid instead of deciding on price alone.

What questions should you ask an influencer marketing agency?

Ask an influencer marketing agency what diagnosis it runs before recommending creators, which KPIs it proposes for your goal, whether it works with an exclusive roster, whether usage rights are included in contracts, how it separates creator fees from its own fees in the quote, and ask for a case study with numbers that is close to your challenge.

What criteria should you use to compare influencer agencies?

Six criteria help compare influencer agencies: the quality of the audit and data, KPIs defined at the brief, independence from creators, mastery of paid media and usage rights, proof of results in your industry, and transparent costs and reporting. Method and proof should weigh more than price, because a cheap offer without framing often costs more in the end.

How much does an influencer marketing agency cost?

In France, influencer marketing agency fees usually represent 15 to 30% of the managed budget. A campaign costs from €10,000 for a seeding program to more than €500,000 for an international, multi-market rollout, and a single post costs €50 to €50,000 depending on the creator’s tier. Always compare what each quote actually includes, not just the total.

What is the minimum budget to work with an influencer agency?

A credible test with an influencer agency starts at around €10,000 to €15,000: targeted seeding or a pilot campaign with a few creators. Below that, the time spent on the audit, creator selection and steering takes too large a share of the budget. The first test validates creators, formats and KPIs before you invest at a larger scale.

Should you choose an influencer agency or an influencer platform?

An influencer platform suits trained in-house teams that run volume or gifting campaigns: the tool speeds up search and tracking, but your team does the work. An influencer agency adds strategy, creator selection, negotiation, paid media amplification and business measurement. The right choice depends on your internal resources, your budget and how closely the campaign is tied to business goals.

Should you hire a local or an international influencer agency?

If you target several markets, hire an influencer agency that can run local activations with a single point of contact and centralized reporting. Influencer marketing depends heavily on each country’s culture and language: a purely local agency is enough for one market, but it becomes a bottleneck as soon as the campaign has to roll out internationally.

How long does onboarding with an influencer agency take?

Onboarding with an influencer agency usually takes 2 to 4 weeks. This phase covers the competitive audit, understanding the brand’s identity, defining the KPIs and building the roadmap before any creator is contacted. An agency that offers to launch a campaign within a few days is often skipping this framing step, which is where most of the results are decided.

How to choose an influencer marketing agency
in 2026

6 criteria to evaluate an influencer marketing agency

1. An audit and data before any recommendation