An influencer marketing agency is a company that plans and runs creator campaigns for brands. It finds creators who fit the brand, negotiates their fees, writes briefs, reviews every post before it goes live and reports on clicks, codes and sales. The brand pays the agency for that work, typically $1,000 to $20,000 a month on retainer or from $5,000 per project in the ranges we see in 2026, and pays the creators separately.

This guide explains what an agency actually does, how it differs from a platform or an in-house team, and when a wellness brand needs one.

What does an influencer marketing agency do?

An agency handles the work between "we want creators" and "here is what they sold." That work splits into five jobs.

• Sourcing. Finding creators whose audience matches your buyer, and checking them for bought followers, off-niche content and past claim problems.
• Rate negotiation. Agreeing fees, usage rights, exclusivity and deadlines, and putting them in a contract.
• Brief writing. Giving each creator a clear brief: the product, the hook, the talking points and what not to say.
• Content review. Checking scripts before filming and final cuts before posting.
• Reporting. Tracking codes, links and sales per creator, and telling you who to rebook.

Some agencies add more services:

• UGC production, where creators make content for your channels and ads
• Paid boosting of creator posts
• TikTok Shop and affiliate program management
• Product seeding at scale

What is the difference between an influencer agency and an influencer marketing platform?

A platform gives you software. An agency gives you people and a process.

An influencer marketing platform is a database of creators with search filters, outreach tools and sometimes payment and reporting features. You still do the work: finding, messaging, negotiating, briefing, approving and tracking.

An agency does that work for you, with contacts it already has. You pay more than a platform subscription, but you spend far fewer hours.

Platforms suit brands with an in-house team and time to run outreach. Agencies suit brands that want results without hiring.

How is an agency different from running influencer marketing in-house?

In-house means you hire someone, usually an influencer or partnerships manager, and build everything from zero: creator lists, contracts, briefs and reporting. You get full control and deep product knowledge. You also get months of ramp time before the first post goes live.

An agency arrives with creators, templates and a review process already built. The trade-off is less day-to-day control and a monthly fee.

Many brands start with an agency, learn which creators and messages sell, and then bring parts of the work in-house.

How do influencer marketing agencies charge?

Agencies charge in one of three ways. Typical ranges we see in 2026:

• Monthly retainer: $1,000 to $20,000 a month for ongoing campaigns
• Project fee: from $5,000 for a launch or a test with a fixed scope
• Percentage of creator budget: less common, where the agency takes a share of what you spend on creators

On top of the agency fee you pay creators. Typical 2026 ranges by tier are $50 to $300 per post for nano creators (under 10k followers), $300 to $2,000 for micro (10k to 100k), $2,000 to $10,000 for mid-tier (100k to 500k) and $10,000 and up for macro (500k and up).

Always ask for the agency fee and the creator budget as two separate numbers.

What types of influencer marketing agencies are there?

Agencies differ by focus. The main types:

• Full-service agencies that handle strategy, creators, content, paid boosting and reporting across many categories.
• Platform specialists that focus on one channel, such as TikTok or YouTube.
• Niche specialists that focus on one sector, such as beauty, gaming or wellness.
• UGC agencies that produce creator content for the brand's own channels and ads rather than for creators' feeds.
• Talent management agencies that represent creators, not brands. They sell creators to brands, so they work for the other side of the deal.

For a brand, the useful question is which type knows your buyers and your rules best.

When does a wellness brand need an influencer marketing agency?

A wellness brand usually needs an agency when one of three things is true.

• You need volume. More than five creators a month is hard to manage alongside other work.
• Your category has claim rules. Supplements, peptides and anything near health claims need review before every post.
• No one in-house can review content. If no one on your team knows what a platform or regulator will flag, someone else needs to.

Supplement and peptide brands usually hit the second point first. A single post that says a product treats or cures something can get removed and draw attention you do not want. An agency with a written claim process is cheaper than a pulled campaign.

What should you expect from a good agency?

A good agency makes its work visible. You should get:

• A shortlist with audience data for each creator
• A written brief you can read before it goes out
• Approval rights on scripts and final content
• Weekly reports with clicks, code uses and revenue per creator
• A named person who runs your account

If any of those are missing, ask why. Vague answers usually mean a vague process.

What does a campaign with an agency look like, step by step?

A typical campaign runs in five steps.

• Kickoff. You share the product, the goal, the budget and your claim rules.
• Shortlist. The agency sends creators that match your niche and platform, with audience data and rates.
• Briefs and contracts. You approve the creators, the agency contracts them and sends one-page briefs.
• Approval and posting. Scripts and final cuts are reviewed before anything goes live.
• Reporting. Weekly reports show clicks, code uses and revenue per creator, followed by a decision on who to rebook.

The whole cycle usually takes a few weeks for a first round, then gets faster as the roster settles.

How do you choose an influencer marketing agency?

Shortlist three agencies, ask each the same questions and compare the answers. Ask what the fee includes, whether they mark up creator fees, how many review rounds are included, who checks claims and what a sample report looks like. Then run a small paid test before signing a long contract.

What Baseamp does

Baseamp is an influencer marketing agency that works only with wellness, biohacking, longevity, supplement and peptide brands. We source creators who already post in those niches, write briefs with written claim rules, pre-approve every post before it goes live and report weekly per creator. You get a shortlist in 48 hours.

FAQ

What is an influencer marketing agency?

An influencer marketing agency is a company that plans and runs creator campaigns for brands. It finds and vets creators, negotiates fees and usage rights, writes briefs, reviews content before it goes live and reports on what the content sold. The brand pays the agency for this work and pays creators separately.

What is an influencer agency?

An influencer agency is another name for an influencer marketing agency: a company that connects brands with creators and manages the campaign from shortlist to report. Some agencies called influencer agencies represent creators instead of brands, so check which side an agency works for before you sign.

How much does an influencer agency cost?

An influencer agency typically costs $1,000 to $20,000 a month on retainer, or from $5,000 per project, based on typical ranges we see in 2026. Creator fees are paid on top. Brands in regulated categories such as supplements and peptides often pay toward the middle of the range because content review takes more time.