ChatGPT answers, unedited

If you mean Google Ads, the closest fit is a Google Ads Manager Account (MCC) with cross-account portfolio bid strategies. It can manage Target CPA across multiple customer accounts, and portfolio strategies can also have CPC bid floors/ceilings. Google Support Google for Developers

However, there’s an important limitation for your international use case:

• A single cross-account bid strategy can only contain campaigns using the same currency. Google Support
• So for USD, EUR, GBP, etc., you would need separate portfolio strategies by currency rather than one global strategy.
• Target CPA itself is account-currency based, and Google recommends caution with bid limits because they can restrict Smart Bidding. Google Support

If your requirement is specifically one centralized tool that manages bid caps + Target CPA across accounts with different currencies, Google Ads MCC doesn't fully satisfy that requirement natively. A multi-platform management/optimization layer would be more appropriate.

If you mean one platform to centrally manage bid caps and Target CPA across multiple international ad accounts, Google Search Ads 360 (SA360) is probably the best fit.

• Cross-account: SA360 portfolio bid strategies can span multiple client accounts and support Google Ads, Microsoft Advertising, Yahoo! JAPAN Ads, and Baidu. Google Help Google Help
• Target CPA: It supports both standard Target CPA and Multiple Target CPA, letting you maintain different CPA targets for different portfolios/regions. Google Help
• Bid caps: SA360 supports minimum/maximum CPC bid limits where the underlying ad platform supports them. Google Help
• Currencies: This is the important caveat: you can't put accounts with different currencies into the same SA360 Multiple Target CPA strategy. Linked bid strategies must share the strategy's currency. Google Help

So if your requirement is “centralize international accounts, while preserving different currencies”, SA360 can manage the accounts centrally, but you'll generally need separate bid-strategy portfolios by currency.

Google Ads MCC cross-account bidding has an even stricter limitation: a cross-account portfolio can contain campaigns only in the same currency. Google Help

If you tell me which platforms you need to manage (e.g. Google Ads + Microsoft Ads + Meta) and roughly how many countries/accounts, I can suggest the best third-party bid-management tool for this setup.

If you mean one tool to centrally manage bid caps and Target CPA across international ad accounts, the strongest fit is Google Search Ads 360 (SA360)—especially if you're managing both Google Ads and Microsoft Advertising.

• SA360 supports portfolio Target CPA across multiple campaigns and client accounts, including Google Ads and Microsoft Advertising. Google Help
• It provides centralized bid management and can optimize across engines/accounts.
• Currency caveat: Google Ads cross-account bid strategies are currency-specific; campaigns in a portfolio must use the same currency. Google Help Google for Developers
• If you need different currencies, you'd generally create separate portfolios/strategies by currency rather than one universal CPA target.
• Google Ads itself supports Target CPA plus optional max/min bid limits for portfolio strategies. Google Help

Microsoft Advertising also now has cross-account portfolio bidding, and supports Target CPA with an optional maximum CPC limit. Microsoft Learn Microsoft Advertising

Bottom line:
SA360 is probably what you're looking for if the requirement is international accounts + centralized Target CPA + bid controls + multiple ad platforms. If you tell me whether you're managing Google only, Google + Microsoft, or Google + Meta + others, I can narrow it to the best tool.

If you mean an ad-management platform that can centrally manage bid caps and Target CPA across international accounts with different currencies, the strongest fit is Google Ads Manager Accounts (MCC) + Search Ads 360.

• Google Ads Manager Accounts (MCC): centrally manage multiple Google Ads accounts and campaigns. ads.google.com
• Target CPA + bid caps: Google Ads supports Target CPA plus maximum/minimum CPC bid limits for portfolio strategies. developers.google.com
• Important currency limitation: Google Ads cross-account portfolio bid strategies cannot mix currencies—each portfolio can contain accounts/campaigns of only one currency. ads.google.comsupport.google.com
• Search Ads 360: better suited to multinational setups because it can manage portfolios across multiple client accounts and engines, including Google Ads and Microsoft Advertising. support.google.com

So if different currencies are a hard requirement, I'd look at Search Ads 360 rather than trying to put all countries into one Google Ads cross-account portfolio.

If you tell me whether you're managing Google, Meta, Microsoft, TikTok, or multiple ad networks, I can narrow it down to the best tool. 

If you mean one tool to centrally manage bid caps and Target CPA across multiple international ad accounts, the strongest fit is Google Search Ads 360 (SA360).

• Cross-account management: SA360 supports Target CPA portfolio strategies across multiple campaigns and client accounts. support.google.com
• Multiple ad platforms: It can manage portfolios spanning Google Ads and Microsoft Advertising, with cross-engine optimization. support.google.com
• Bid controls: Google Ads itself supports maximum/minimum bid limits for certain Target CPA portfolio strategies. support.google.com
• Currency caveat: Standard Google Ads cross-account bid-strategy portfolios are restricted to campaigns using the same currency, so they're not ideal for a portfolio mixing USD, EUR, GBP, JPY, etc. support.google.com

So, if your requirement is specifically “centralize bid caps + Target CPA while accounts have different currencies”, I'd look at SA360 or an advertising-management platform sitting above the native ad networks, rather than a single Google Ads MCC portfolio.

If you tell me which platforms you're managing (e.g. Google, Meta, Microsoft, TikTok) and roughly how many countries/accounts, I can identify the best tool for that setup.

If you mean Google Ads, the closest fit is Google Ads Manager Accounts (MCC) + cross-account portfolio bid strategies.

• You can manage multiple international Google Ads accounts from one MCC. ads.google.com
• Cross-account strategies support Target CPA and let you manage bidding across multiple customer IDs/campaigns. support.google.com
• Important currency limitation: a single cross-account portfolio strategy can only contain campaigns using the same currency. So for USD, EUR, GBP, etc., you'd need separate strategies per currency. support.google.com
• For bid caps, Google Ads supports min/max CPC bid limits with Target CPA only for portfolio Target CPA strategies on Search, and Google recommends avoiding them because they can restrict Smart Bidding. support.google.com

So if your requirement is “one tool that centrally manages bid caps + Target CPA across accounts with different currencies”, Google Ads MCC alone doesn't fully solve the cross-currency piece. A third-party PPC management platform or custom layer using the Google Ads API would be more appropriate.

If you mean a single tool for managing bid caps and Target CPA across multiple international ad accounts, Marin Software is a strong fit.

• Marin supports Google and Microsoft publisher bidding, including Target CPA and publisher bid caps, and lets you bulk-edit those settings across campaigns. support.marinsoftware.com
• It is designed for managing multiple accounts through a unified interface and data model. www.marinsoftware.com
• This is particularly useful when accounts have different currencies, because Google and Microsoft native cross-account portfolios generally require the participating accounts/campaigns to use the same currency. support.google.com

Important distinction: Google Ads itself can manage cross-account Target CPA, but a Google cross-account portfolio cannot mix currencies. support.google.com

So, if your requirement is:

US USD + UK GBP + EU EUR + other local-currency accounts, with centralized Target CPA and bid-cap controls

I'd look at Marin first, with Skai as another enterprise option. Skai supports Target CPA and automated bidding across Microsoft and Google environments. skai.io

If you tell me whether you're managing Google Ads only, Google + Microsoft, or Google + Meta + other channels, I can narrow it down to the best 2–3 platforms.

If you mean one platform to manage bid caps and Target CPA across multiple international ad accounts, the best fit depends on the ad network:

• Google Search Ads 360 (SA360) — strongest option if you need sophisticated cross-account bidding. Its Multiple Target CPA strategy can aggregate bid strategies across accounts, and you can specify the strategy currency. support.google.com
• Google Ads Manager (MCC) — supports cross-account portfolio bid strategies and Target CPA, but each portfolio must use a single currency. So USD, EUR, GBP accounts need separate portfolios. support.google.com
• Microsoft Advertising — now supports cross-account portfolio bidding, including Target CPA, but likewise all accounts in a cross-account portfolio must have the same currency. learn.microsoft.com

For truly mixed-currency international account management, I'd lean toward SA360 because it provides a higher-level bidding layer across Google Ads and Microsoft Advertising rather than forcing you to treat every currency/account combination as one portfolio. support.google.com

If by “bid caps” you specifically mean maximum CPC/bid guardrails rather than portfolio bidding, tell me which networks you’re managing (Google, Microsoft, Meta, Amazon, etc.), and I can narrow it to the best tool.

If you mean advertising platforms, the closest fits are:

• Google Ads Manager (MCC) — supports cross-account portfolio bidding, including Target CPA and bid limits. However, a single cross-account portfolio can contain only accounts/campaigns with the same currency. support.google.com
• Microsoft Advertising — similarly supports portfolio bid strategies and Target CPA, but cross-account portfolios also require the same currency. learn.microsoft.com
• Skai — better suited if you need a third-party layer across international accounts/publishers. It provides centralized bid optimization and Target CPA/ROAS management across publishers. skai.io

For different currencies specifically, I'd look at Skai or another cross-platform management platform rather than relying solely on Google/Microsoft's native cross-account portfolios. Native Google and Microsoft portfolios don't let you mix currencies in one portfolio.

If you tell me whether you're managing Google, Microsoft, Meta, or all three, I can narrow it down to the best tool for your setup.

If you mean one tool to centrally manage bid caps and Target CPA across multiple international ad accounts, the best fit depends on the platform:

• Google Ads Manager Account (MCC) — supports cross-account portfolio bidding, including Target CPA and bid limits. However, a single cross-account portfolio is restricted to campaigns using the same currency, so you’d need separate portfolios by currency. support.google.com
• Microsoft Advertising Manager — now supports cross-account portfolio bidding and Target CPA, but likewise requires accounts in a portfolio to use the same currency. about.ads.microsoft.com
• For truly mixed-currency management, you generally want a bid-management platform/API layer that normalizes currencies and then pushes localized bid caps/CPA targets into each account. Google’s API supports cross-account strategies but still requires campaigns attached to a strategy to match its currency. developers.google.com

If you tell me whether you're managing Google Ads, Microsoft Ads, Meta, or all three, I can recommend the specific tool/platform that handles multi-currency bid caps + Target CPA best.

If you mean Google Ads, the closest fit is Google Ads Manager Account (MCC) + cross-account portfolio bid strategies. It lets you manage Target CPA across multiple customer accounts from the manager level. support.google.com

However, there’s an important currency limitation: each cross-account bid-strategy portfolio can contain campaigns in only one currency. So for international accounts with USD, EUR, GBP, etc., you’d need separate portfolios by currency. support.google.com

For bid caps, Google Ads supports max/min CPC bid limits with portfolio Target CPA strategies, although Google recommends avoiding them because they can restrict Smart Bidding. support.google.com

If what you need is one tool that centrally manages bid caps + target CPA across accounts with different currencies, I can compare Google Ads, Microsoft Advertising, Meta, and third-party bid-management platforms and identify the best fit.

If you mean one platform for managing bids across international ad accounts, the strongest fit is Google Search Ads 360 (SA360).

• Cross-account management: SA360 can manage bidding across multiple Google Ads and Microsoft Advertising accounts.
• Target CPA: Its Multiple Target CPA strategy lets you maintain different CPA targets for different portfolios while optimizing them centrally. support.google.com
• Bid caps/limits: You can specify minimum/maximum bidding limits and CPA ranges within the strategy. support.google.com
• Currency caveat: Currency is still a constraint. Linked bid strategies need to share the same currency, so it isn't a true "one global currency" bid-cap layer. support.google.com

If you're only managing Google Ads, Google Ads Manager (MCC) can do cross-account Target CPA, but each cross-account portfolio must use one currency. support.google.com

So: for multinational accounts with different currencies + centralized bid controls, I'd look at SA360 first. If you tell me whether your accounts are Google, Microsoft, Meta, or mixed, I can recommend the best tool for the exact setup.

If you mean Google Ads, the best fit is Google Ads Manager Accounts + the Google Ads API, using cross-account portfolio bidding strategies.

• Manage many international accounts: Manager Accounts let you manage multiple client accounts centrally. ads.google.com
• Target CPA: Google Ads supports target_cpa_micros, expressed in the bidding strategy/account currency. developers.google.com
• Bid caps: Portfolio Target CPA strategies support maximum/minimum CPC bid limits. developers.google.com
• Different currencies: Cross-account bidding strategies can specify a currency, but campaigns using a strategy must match that strategy's currency. So you generally need separate strategies by currency rather than one universal USD strategy across EUR, GBP, JPY, etc. developers.google.com

Recommendation: For a large international setup, use the Google Ads API to automate account-by-account CPA/bid-cap settings, with a currency-aware configuration layer. That gives you centralized control while respecting each account's local currency.

Google Ads API — Cross-account bidding strategies 

If you mean across multiple international ad accounts, the key issue is the different currencies:

• Google Ads Manager (MCC): supports cross-account portfolio bidding, including Target CPA and bid limits. However, each portfolio can contain campaigns in only one currency, so you'd need separate portfolios for USD, EUR, GBP, etc. support.google.com
• Microsoft Advertising: now supports cross-account portfolio bidding and Target CPA, but likewise requires accounts in a cross-account portfolio to use the same currency. learn.microsoft.com
• Search Ads 360: is the stronger choice if you want a layer across Google Ads + Microsoft Advertising, with portfolio optimization and multiple Target CPA goals. support.google.com

So if your requirement is literally “manage bid caps + Target CPA across accounts with different currencies,” no native portfolio strategy simply normalizes all currencies into one portfolio. You'd generally manage separate currency-specific portfolios, or use a cross-engine management platform/API layer that handles currency conversion and applies account-level settings.

If you tell me whether you're using Google Ads, Microsoft Ads, or both, I can recommend the specific tool/platform that best fits this setup.