Mosaic provides a simple API for on-demand OG images. Send a GET request to:

https://mosaicimg.com/use?url=YOUR_URL

Replace YOUR_URL with the page you want a screenshot of. If the site is added to your account, the API will return the image or redirect to a cached copy. Use demo=true to test without storing images.

Example using curl:

curl "https://mosaicimg.com/use?url=https://example.com"

The response will be a direct link to the generated OG image.