# Guides

> How to choose and use a brand API, organised by what you are building, from a logo in a CRM to agents that make work for your customers' brands, with costs.

Start with [which brand API you need](https://brandapis.com/guides/which-brand-api) if you're not sure which kind fits. The other guides each start from a job.

- [Which kind of brand API do you need?](https://brandapis.com/guides/which-brand-api): Choose by the job. Use a lookup for a company's logo, its DAM's API for approved files, and an agentic brand API when agents make new work for the same brands.
- [Moving off the Clearbit Logo API](https://brandapis.com/guides/moving-off-clearbit): The Clearbit Logo API shut down on December 8, 2025. Logo.dev, Brandfetch, LogoKit and Hunter each replace its URL; here is what changes in your code with each.
- [Company logos in a CRM or list](https://brandapis.com/guides/logos-in-a-crm): To show a logo beside each company in a list, put a logo API's image URL in the page. Which providers allow it free, missing logos, and the caching rules.
- [Prefilling signup from a work email](https://brandapis.com/guides/prefill-signup-from-email): Look up the domain of a new user's work email to show their company's logo and colours on the first screen. Which APIs accept an email, and what each costs.
- [Customer brands in an AI product](https://brandapis.com/guides/customer-brands-in-an-ai-product): If your product makes work for customers, a lookup gets their logo at signup and an agentic brand API gives each job its guidance and files. What each costs.
- [Brand work through agents, for teams and agencies](https://brandapis.com/guides/brand-work-through-agents): Which brand APIs agents in Claude, ChatGPT, Cursor and Codex can reach over MCP, what each gives them, and how a team or agency keeps many brands apart.

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Source: https://brandapis.com/guides
Last updated: 2026-11-10
Published by The Brand API Register. The Brand API Register is run by Rainbrand, which makes one of the APIs listed. Its entry follows the same rules as the others.