How to Choose a Paid Media Agency for Campaigns Across the US and Asia

Choosing a paid media agency for the US and Asia comes down to four checks: whether the team buys natively on each market’s platforms, whether the brand keeps ownership of its ad accounts and data, whether the fee structure matches how spend will grow, and whether the agency knows each market’s advertising rules. Agencies are usually paid by monthly retainer, by a percentage of ad spend, or by a hybrid of the two.

A paid media agency that performs well in one market can underperform badly in another. Search, social, and messaging platforms differ between the US, Japan, and Southeast Asia, and so do ad copy norms, disclosure rules, and the way customers move from an ad to a purchase.

No agency is the best choice for every brand, so the useful question is which agency fits a specific set of markets, budgets, and goals. The criteria, questions, and cost structures below are the ones we’d use to evaluate any agency, including our own media buying team at Creative For More.

What Does a Paid Media Agency Do?

A paid media agency plans, buys, and optimizes advertising on platforms such as Google, Meta, TikTok, LinkedIn, and Amazon. Its work covers channel strategy, audience targeting, campaign setup, creative testing, bid and budget management, conversion tracking, and reporting.

Some agencies also produce the ad creative, while others expect the brand to supply it. Paid search is often handled as a separate discipline, and most agencies offer it as a dedicated search engine marketing service alongside paid social. Search campaigns also perform better when they’re planned with organic search in mind, which is why SEO and PPC work best hand in hand.

What Makes a Paid Media Agency the Right Fit?

The right paid media agency is the one whose market coverage, channel expertise, and commercial model match the brand’s own plan. For campaigns across the US and Asia, six criteria separate a good fit from a poor one.

1. Native buying in each market. The team should run campaigns on the platforms each market actually uses, not only on Google and Meta.
2. Local-language creative. Ad copy for Japan and Southeast Asia should be written by native speakers, because translated English copy reads as foreign and usually converts worse.
3. Measurement it can explain. The agency should show how it tracks conversions in each market, which attribution window it uses, and how it separates results by country.
4. Brand-owned accounts. The ad accounts, pixels, and audience lists should belong to the brand, with the agency given access.
5. Regulatory knowledge. The team should know each market’s advertising and disclosure rules before it launches, not after a platform rejects the ads.
6. A fee model that scales sensibly. The cost structure should still make sense when spend doubles or when one market is paused.

How Do Paid Media Channels Differ Between the US and Asia?

The US, Japan, and Southeast Asia each rely on a different mix of search, social, and messaging platforms. An agency that plans all three markets from a US channel mix will miss the platforms that carry much of the reach in Asia.

LINE illustrates the gap. According to LY Corporation’s 2025 media guide, LINE had 98 million monthly users in Japan as of March 2025, which makes it a mass-reach ad channel that most US-based agencies have never bought.

Southeast Asia is moving toward marketplace and video formats. According to the e-Conomy SEA 2025 report by Google, Temasek, and Bain & Company, online advertising in the region grew 16 percent year on year, driven by retail media networks, video commerce, and AI-powered ad formats. We cover the wider differences in how regional social strategy differs from Western playbooks.

How Much Does a Paid Media Agency Cost?

Paid media agencies usually charge a fixed monthly retainer, a percentage of ad spend, or a hybrid of a base retainer plus a percentage above a spend threshold. Ad spend itself is almost always billed separately from the agency’s management fee.

Among large advertisers, fees are the dominant model. According to the Association of National Advertisers’ Trends in Agency Compensation report (2022), 82 percent of respondents used fee-based compensation, up from 68 percent in 2016, and 41 percent used performance incentives.

The choice between retainer and percentage of spend matters more as budgets grow. As an illustration, a brand spending US$30,000 a month under a 15 percent fee pays US$4,500 in management fees, and the same brand spending US$60,000 pays US$9,000, even though adding budget to proven campaigns rarely doubles the work.

Multi-market programs change the calculation in the other direction. Running Japan and three Southeast Asian countries means four sets of copy, targeting, and reporting, so a retainer defined by markets and channels often reflects the real workload better than a spend percentage.

What Questions Should You Ask a Paid Media Agency?

The most useful questions test how the agency works in each market, who owns the accounts and data, and how fees and reporting are structured. Eight questions cover most of what a brand needs to know before signing.

1. Which platforms do you actively buy on in each of our target markets?
2. Who writes the ad copy for Japan and each Southeast Asian market, and are they native speakers?
3. Will the ad accounts, pixels, and audience lists be created under our ownership?
4. How do you track conversions in each market, and which attribution window do you use?
5. What exactly does the fee cover, and what counts as out of scope?
6. How does the fee change if we double spend, add a market, or pause one?
7. What will the monthly report show, and can we see results by country?
8. Which advertising and disclosure rules apply to our category in each market?

Vague answers to the ownership, measurement, or fee questions are the clearest warning signs. An agency that can’t say how it measures results by country will struggle to tell which market deserves more budget.

Who Should Own the Ad Accounts?

The brand should own its ad accounts, with the agency granted access rather than holding the accounts itself. Ownership keeps campaign history, audiences, and conversion data with the brand if the agency relationship ends.

The major platforms support this arrangement. Google Ads access levels let a brand keep admin access while giving an agency standard access or linking the account to the agency’s manager account, and Meta’s Business Manager works on a similar partner-access model.

Which Advertising Rules Change Between the US and Asia?

Disclosure and endorsement rules differ between markets, and they apply to paid social and influencer-backed ads as much as to traditional advertising. An agency running campaigns across the US and Japan needs to know both sets of rules.

In the US, the Federal Trade Commission’s endorsement guidance, revised in 2023, requires clear disclosure when a brand has a material connection with an endorser. In Japan, the Consumer Affairs Agency made undisclosed advertising, often called stealth marketing, a violation of the Act against Unjustifiable Premiums and Misleading Representations from October 1, 2023.

Regulated categories such as health, beauty, finance, and alcohol carry further rules in each market. We run paid media from Singapore, Tokyo, and New York, and in Japan our Japan-based account managers write and review ad copy in Japanese, so claims and disclosures are checked before launch rather than after an ad is rejected.

For brands running paid media across the US and Asia, the selection criteria above are easier to meet with a team that already buys on each market’s platforms and writes copy in each market’s language.

If your company is looking for a strategic marketing partner, the Creative For More team can help. Book a discovery call to explore how we can support your brand’s growth.

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