Why casting has become the decisive step
74% of marketers plan to increase their influencer marketing budgets in 2026 (Influencer Marketing Hub, Benchmark Report 2026). In France, influencer marketing investment reached €519 million in 2024, representing 5% of digital advertising spend (ARPP / France Pub study 2025). Competition for the best creator profiles grows every quarter.
But the challenge goes beyond budget. According to a SociaVault Labs study of 100,000 accounts (2026), 37.2% of influencer followers show signs of fraud: fake accounts, bots, or purchased followers. The macro tier (100,000 to 500,000 followers) has the highest fraud rate at 48.3%. Without a rigorous casting method, a brand risks investing in audiences that do not exist.
Casting is no longer about finding a creator "with lots of followers." Teams that deliver the best results apply a multi-criteria selection framework, backed by analytics tools and systematic human verification.
The five criteria for effective casting
1. Creator-brand alignment
The first filter, and the most decisive one. An influencer may show strong KPIs, but if their editorial universe does not match the brand, the partnership will feel forced. Audiences spot inauthentic collaborations: 51% of French consumers say they would stop following a creator who promotes overconsumption, and 35% would unfollow one who partners with unethical brands (Reech 2025).
At Matriochka Influences, we review a creator's last 50 posts before any outreach. Tone, recurring topics, previously mentioned brands, and editorial positioning must align with the client's DNA.
2. Real engagement rate
Follower count tells almost nothing about a creator's effectiveness. Engagement rate reveals the quality of the relationship between a creator and their community.
2026 benchmarks vary by platform and account size (Influencer Marketing Hub, Benchmark Report 2026; Nowadays Media 2026). On Instagram, nano-influencers (1K to 10K followers) achieve 5 to 15% engagement. Micro (10K to 50K) range between 3 and 8%. Macro (50K to 250K) sit between 1 and 4%. Mega (250K+) drop to 0.5 to 2%. Reels generate an average of 3.8% engagement versus 1.2% for static posts.
On TikTok, the median engagement rate across all tiers reaches 8%, with peaks between 10 and 18% for nano-creators (The Keyword 2026).
A creator whose engagement rate falls well below the average for their tier should raise a flag. It often signals purchased followers or audience disengagement. For more on the metrics that matter, see our guide on how to measure the ROI of an influencer campaign.
3. Audience quality
A decent engagement rate means little if the audience does not match the brand's target. You need to verify geographic distribution, age, gender, and interests of the follower base. A French creator with 40% of their audience based in Brazil will not serve a campaign targeting the French market.
Analytics platforms like Kolsquare, HypeAuditor, and Traackr provide detailed demographic data. They also flag anomalies: sudden follower spikes (especially on weekends), comments in languages unrelated to the creator's market, or engagement concentrated in suspicious time windows.
4. Reliability and professionalism
Creating quality content is no longer enough. Brands expect influencers to follow a brief, deliver on time, master advertising transparency rules, and understand the legal constraints of their activity.
France's June 9, 2023 law requires the label "Advertising" or "Commercial collaboration" on all sponsored content. In 2024, French consumer protection authorities (DGCCRF) inspected 287 influencers and found violations in 46% of cases (ADEME, Responsible Influence Guide, 2026 edition). The advertising transparency rate measured by the ARPP rose from 73% in 2020 to 97% in Q1 2025, but the remaining 3% still expose brands to legal and reputational risk.
The ARPP's Responsible Commercial Influence Certificate, in its version 2.0 launched in April 2025, is a credibility signal. Over 2,400 creators held the certification by early 2026 (ADEME guide 2026).
5. Track record and storytelling ability
Past results remain the best predictor of future performance. Ask for statistics from previous campaigns: sponsored engagement rate, click-through rate, cost per engagement. A strong creator shares these figures transparently.
Beyond numbers, assess storytelling ability. An influencer who can build a narrative around a product creates stronger recall than one who simply displays it. Watch how the creator integrates partnerships into their editorial flow. The best collaborations blend into the creator's organic content: they do not disrupt the feed, they enrich it.
Tools for evaluating a profile
Three categories of tools support influencer casting in 2026.
Influencer marketing platforms
Kolsquare indexes over 3 million profiles and covers all sectors, with a strong European base. HypeAuditor stands out for its fraud detection algorithms and audience quality analysis. Traackr offers a proprietary performance score (VIT) and advanced competitive benchmarking features (Be-Hype, 2026 comparison). These platforms typically cost between €500 and €2,000 per month.
Fraud detection tools
Solutions like HypeAuditor, Modash, and Favikon analyze growth curves, engagement patterns, and comment quality to spot fake followers. Warning signs include: sudden growth followed by a plateau, generic or repetitive comments, and engagement rates far below the account's tier average.
In 2026, AI-driven bot networks account for 58% of all detected fraud cases, a 34% increase from 2025 (SociaVault Labs 2026). Human detection alone is no longer sufficient.
Manual review
No tool replaces the human eye. At Matriochka Influences, we complement every data analysis with a manual review of the last 20 to 30 posts. We check editorial consistency, visual quality, the tone of community interactions, and partnership history. A creator who worked with a direct competitor in the past six months is not the right fit.
Matching the casting to the campaign type
The ideal profile depends on the objective.
For large-scale awareness campaigns, macro and mega-influencers deliver reach. Their engagement tends to be lower, but for impression volume, they are the right lever, provided audience quality is verified first.
For engagement and conversion, nano and micro-creators (1,000 to 50,000 followers) outperform larger profiles. They capture 49.9% of influencer budgets in the US in 2026 (Influencer Marketing Hub, Benchmark Report 2026) and achieve engagement rates up to 7 times higher than mega-influencers. Their communities trust them because the connection is direct and personal.
For a product launch, the combination wins: one or two high-reach creators for visibility, complemented by a dozen specialized micro-influencers for credibility and click-through. This is the approach we favour at Matriochka through our Next-Gen Influence method.
For a deeper look at the differences between creator tiers, our article on micro-influencers vs macro-influencers details the strengths and limitations of each segment. And to calibrate your budget based on the profiles you select, see our guide to influencer marketing costs in 2026.
The most common casting mistakes
Choosing based on follower count
The most widespread error. A profile with 500,000 followers and a 48% fraud risk (macro tier average, SociaVault Labs 2026) is worth less than a profile with 15,000 followers and a real, engaged community.
Ignoring partnership history
A creator who promoted a competitor, a problematic product, or a brand with questionable practices in recent months is a risk. The ADEME Responsible Influence Guide (2026 edition) recommends verifying compatibility between the creator's values and the brand's values, including reviewing past collaborations.
Skipping the brief stage
Casting and briefing are linked. Good casting means sharing expectations early, to verify that the creator understands the project and can commit to it. Our guide on how to create an effective influencer brief covers this step in detail.
Neglecting legal compliance
France's 2023 influence law establishes co-responsibility between advertiser, influencer, and agent. If the creator fails to follow transparency rules, the brand and agency are also liable. Build compliance checks into the casting stage, not after the contract is signed.
The Matriochka method for tailored casting
At Matriochka Influences, casting accounts for 30 to 40% of the project timeline on an influence campaign. This is not a bottleneck: it is an investment that determines everything that follows.
Our approach is built on the Next-Gen Influence method: Data, Idea, Ecosystem, Reach, KPI. Casting spans the first three phases.
Data phase: we cross-reference Kolsquare data with our own database of vetted creators. We analyze past performance, audience quality, and fraud signals on every shortlisted profile.
Idea phase: we identify creators whose editorial world resonates with the campaign's creative concept. The right casting is not the creator with the most reach. It is the one who tells this particular story best.
Ecosystem phase: we build the profile mix. Nano, micro, macro: each tier plays a role in the campaign's distribution architecture. Casting is not a list of names. It is a coverage strategy.
Over twelve years of working with brands like Nivea, Volvo, L'Oréal Paris, Guerlain, and Amazon, we have built a network of tested, reliable creators. We know their strengths, their constraints, and how they work.
Our integrated PR and influence approach also allows us to combine creator campaigns with press relations, maximizing overall media coverage. Discover how we bring these two levers together in our article on PR and influence: why bring both under one roof.
To learn more about our approach or discuss casting for your next campaign, get in touch with our team.
Contact
elodie.monchicourt@mtrchk.com / charlie.trouillebout@mtrchk.com
mtrchk.com
