The NegativeEV X bot (@shoulditail)

See a bet slip on X and wonder whether it's any good? Tag @shoulditail (https://x.com/shoulditail) in a reply under it — or mention the bot with the bet typed out — and it runs the slip through the same simulation engine as negativeev.com, then replies with the verdict.

Written by Jesse, NegativeEV. Last updated 8 August 2026.

How to use it

Reply to a post that shows a bet slip (a screenshot works — the bot reads it) and tag @shoulditail.
Or post @shoulditail followed by the bet in plain text.
The reply includes a link back to negativeev.com for the full interactive breakdown.

Ground rules

One reply per conversation — the bot never spams a thread.
Same coverage as the site: MLB, WNBA, PGA, and ATP, today's slate, games that haven't started.
The bot paces itself, so a reply can occasionally take a little while.

The bot is one machine door into the checker, and the MCP server and llms.txt are the others, built for agents instead of replies.

@shoulditail is an automated account run by NegativeEV and managed by https://x.com/negative__ev