You can generate captcha images with arbitrary text by going to https://api.opencaptcha.io/ and expanding the POST /captcha section (click on the downward arrow on the right), then click on Try it out, then edit the hello, and click Execute (repeatedly, if you don't like the resulting image).

Strange! Token already spent. By the way, the captcha idea is really good. I think someone is just hanging around in the saloon to grab someone's nuts