ODDBOUT Fight Club Showrunner PayPal AI Hackathon entry Open the demo →

Sponsors pay with PayPal.
An AI producer runs the show.
Creators get paid.

ODDBOUT Showrunner turns one PayPal payment into an hour of AI-produced fighter cups with your promo in the breaks. Then it checks the payment with PayPal and pays the fighters' creators.

Try the Sandbox demo Source on GitHub Watch the demo video (2:45)

PayPal Sandbox only. No real money moves. The full write-up is docs/HACKATHON.md.

The money loop

Real records from our Nov 4, 2026 Sandbox rehearsal (times in KST). Test money only. Full record

  1. 1 PayPal Checkout

    Sponsor pays

    Orders v2: the buyer approves and our server captures. DON is credited only after a verified capture.

    order 88V317260P462440Y
    capture 4PK99542NL408204G
  2. 2 Ledger

    One ticket, one debit

    Spotlight · 1 hour costs 300 DON. Four fighters are assigned at purchase.

    46,725 → 46,425 DON
    extra charges: 0
  3. 3 AI · MCP

    The AI producer runs the show

    The On-Air Agent schedules cups through ODDBOUT's MCP tool host_cup, inside the ticket's allowance.

    4 cups · 12 verified bouts
  4. 4 PayPal MCP

    The payment is reconciled

    The official PayPal MCP server's get_order confirms the capture that funded this ticket.

    matched · 04:41:29 KST
  5. 5 PayPal Payouts

    Creators get paid

    Appearance fees go out after the owner approves. “Paid” requires every recipient item to report SUCCESS.

    batch BG2R7YQFNCV22
    USD 0.32 · SUCCESS

Each fighter earns USD 0.02 per completed cup: four fighters × four cups = USD 0.32. This Sandbox maps all four fighters to one test receiver, so PayPal sent a single item, U4FN6P272QXHU.

Try it in 10 minutes

Each step shows what you should see.

  1. Sign in with Google.Your DON shows 0
  2. Add DON → Starter, USD 10. Approve with the Sandbox buyer.“1,000 DON added”
  3. Choose 1 hour for 300 DON.A ticket with four fighters
  4. Add your promotion: the MP4 and a promo URL, then Save Promotion.An AI-written sponsor introduction
  5. Add to Calendar → On-Air Agent → tick the check → Start.“Agent running”
  6. Wait for the first cup, about 5 minutes, then open Watch broadcast.Your promo break and a replay of the verified bout
  7. Press End broadcast and confirm. The current cup finishes.“Finished”
  8. Press Check settlement.Settlement shows “Matched”
  9. Tick the approval for the creator fees and press Pay with PayPal.“Paid · PayPal batch … · every recipient SUCCESS”

One graphical runner serves this demo. If Start says another broadcast is using the host, your ticket is saved: try again in a few minutes. Ending after the first cup keeps the runner free for the next judge.

Where PayPal does the work

Orders v2 · Checkout
Create, buyer approval, server capture. A COMPLETED capture is checked against the payee, amount, currency and the account's own top-up before any DON is credited.
Webhooks
Signatures are verified with PayPal's verification API. Capture events use the same credit function as the synchronous capture, and a capture ID credits once. Refund and reversal events are stored once per event ID and freeze spending.
Official PayPal MCP server
@paypal/mcp, started with only the read tools get_order, list_transactions and get_refund, and refused if it offers more. The server compares each top-up that funded the ticket with get_order.
Payouts
Creator appearance fees, sent only after the owner approves. A retry reuses the same batch ID, so it can never create a second batch. A refund or reversal freezes payment.

Where AI does the work

On-Air Agent
A model reads the ticket's lineup and remaining time and proposes the next move: host a cup, wait or stop. The server validates each proposal and hosts cups only through ODDBOUT's MCP tool host_cup, with a grant scoped to that one broadcast. It cannot pay or change prices, limits or payouts. On Nov 4 the model was Sol 6.1.
Sponsor introduction
Written from the promo URL's hostname only, labeled as a paid sponsor break, with no product claims. The owner reviews it before pressing Start.
Settlement auditor
Explains the PayPal MCP check to the owner and may call the same read-only tools to look into a mismatch. The server's comparison decides the result, never the model.
Bounded by design
Model calls are capped per broadcast and per day. An unusable AI answer shows Retry Agent, which continues the same ticket with no extra charge.

Built during the hackathon

The submission period opened Oct 1, 2026. Not part of this entry: the ODDBOUT game with its fighters and bout engine, developed in a separate repository, and the fighter creator kit this repository has held since its first commit on Oct 19, 2026. Showrunner's payments, AI producer, reconciliation and payouts were added from Nov 2. Dates are GitHub times in UTC.

What this demo does not claim