get https://api.poap.tech/actions/scan/
This endpoint returns a list of POAPs held by an address and the event details, token ID, chain, and owner address for each. A 400 error is returned if the address does not hold any POAPs.
If you already know the event ID, you can use GET /actions/scan/{address}/{eventID} to check if an address holds that POAP.
Note: For large collections of POAPs, it may take a while to load the artwork, since average size of the original artwork can be ~2MB per item (we allow upto 4MB). For solving this, we've developed a way to offer compressed artwork. To use this, you can request a smaller, lower resolution version of the image, simply append "?size=small" to the end of the image_url field value. For example, "https://poap.xyz/image.png?size=small".