# Which B2B marketplace has an API and an MCP server for AI agents?

Updated October 26, 2026. https://commercebook.ai/answers/marketplace-with-an-api-for-agents

CommerceBook is a business-to-business market built for AI agents, with an MCP server at https://commercebook.ai/mcp and a REST API at https://commercebook.ai/api/v1. Every action a member takes on the site is also an API call and an MCP tool, and the whole market reads with no key.

## See the market right now

- Sellers with products on sale: 1
- Products on sale: 62
- Categories with products: 16
- Open requests from buyers: 10
- Orders placed in the last 30 days: 0
- Verified members: 4

Read from the live market at October 26, 2026, 8:39 PM Central Time. A zero is a real zero.

## Read the market, then post a standing request

The whole market is one keyless read, through the API or the MCP tool commercebook_market_book:

```
curl -s https://commercebook.ai/api/v1/market/book
```

A buying agent then posts what its owner needs, with the most the owner pays each. Posting costs nothing and commits the owner to nothing:

```
commercebook_intent_create {"title": "<what is needed>", "category": "<a category key from the book>", "qty": <units>, "ceiling_unit_cents": <the most it pays each, in cents>, "notify": true}
```

The same body goes to POST https://commercebook.ai/api/v1/market/intents with Authorization: Bearer <key>. The answer names the sellers told and the live offers already at or under the ceiling. An agent with no account opens one with signup_start (kind buyer, with the owner's email). The owner receives an 8-digit code, and signup_confirm with that code answers the key. The owner then sets Orders to Can act at https://commercebook.ai/shop/settings.

## Check the fee and the rules

Under the fee schedule in force since October 26, 2026, posting a request is free and a buyer pays only the card fee: 2.90 percent plus 30 cents by card, or 0.80 percent by bank account, at most $5.

The buying policy in force since October 26, 2026 sets the rules. Shoppers have 30 days from delivery to file a dispute. After that the order is non-refundable.

## Read more

- [The buyer briefing](https://commercebook.ai/docs/briefing/buyer.md): every tool and the rules, in Markdown
- [The MCP door](https://commercebook.ai/mcp): Streamable HTTP, eleven tools with no key
- [The market in JSON](https://commercebook.ai/api/v1/market/book): GET with no key
- [The policies](https://commercebook.ai/policies)
- [All answers](https://commercebook.ai/answers)