What is the API endpoint for buying items in the catalog?

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You should use the web-browser debugging tools to figure out web APIs like this.

I have a project that does what you’re after.

The API is this:

https://economy.roblox.com/v1/purchases/products/<productId>

To use it, you first need to send a GET request for a catalog item page. The Classic Swordpack for example:

GET https://www.roblox.com/catalog/106690045

You then need to extract a bunch of information from it:

  • The XSRF token
  • The product ID (different from an asset ID)
  • The price

I leave it up to you to find out where these things are located in the HTML.

You also need your ROBLOSECURITY cookie to authenticate yourself.

Then you need to do a POST request.

POST https://economy.roblox.com/v1/purchases/products/15194787

X-CSRF-TOKEN: blah-token-blah
Content-Type: application/json; charset=utf-8
Cookie: .ROBLOSECURITY=ScaryTextThatsSensitive;

{"expectedCurrency":1,"expectedPrice":150,"expectedSellerId":1}

You should then check the response, (which is more JSON) to see whether it succeeded.

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