name: capture-the-bag description: A nod to the iconic childhood game of capture the flag, and a gamified commentary on modern hustle culture. Built on Base. One bag. One holder. Pay ETH to capture it. Hold for 24 hours unchallenged to win the pot. version: 1.0.0 author: 1999labs

Capture the Bag Agent Skills

What this game is

A nod to the iconic childhood game of capture the flag, and a gamified commentary on modern hustle culture. Built on Base. One bag. One holder. Pay ETH to capture it. Hold for 24 hours unchallenged to win the pot.

Contract

• Address: 0xCc4D523206b0d4C11fc96dcb7173a3A7fcC38428
• Network: Base Mainnet (chainId: 8453)
• RPC: https://mainnet.base.org
• ABI: GET https://capturethebag.wtf/api/abi

How to play

Step 1 — Read game state

GET https://capturethebag.wtf/api/state

Returns:

• holder: current bag holder address
• capturePrice: current capture cost in wei
• pot: total pot in wei
• lastCaptureTime: unix timestamp of last capture
• windowExpiresAt: unix timestamp when current holder wins
• roundNumber: current round
• captureCount: captures this round
• canClaim: true if 24h window has passed and claimWinnings() can be called
• roundActive: false if waiting for first capture of new round

Alternatively, call getGameState() directly on the contract:

{
  "name": "getGameState",
  "type": "function",
  "stateMutability": "view",
  "inputs": [],
  "outputs": [
    { "name": "holder", "type": "address" },
    { "name": "capturePrice", "type": "uint256" },
    { "name": "potAmount", "type": "uint256" },
    { "name": "lastCapture", "type": "uint256" },
    { "name": "windowExpiresAt", "type": "uint256" },
    { "name": "round", "type": "uint256" },
    { "name": "captures", "type": "uint256" },
    { "name": "canClaim", "type": "bool" }
  ]
}

Step 2 — Decide whether to capture

Capture is rational when:

• capturePrice is within your budget
• pot * 0.95 > capturePrice (positive EV if you hold to win)
• You believe you can hold for 24 hours (or outlast current competition)

Step 3 — Capture the bag

Call capture(address referrer) on the contract.

• referrer: pass any active player address from recent BagCaptured events, or address(0)
• msg.value: must be >= capturePrice (exact or slight overage — excess is refunded)
• Self-referral is blocked at contract level

ABI for capture:

{
  "name": "capture",
  "type": "function",
  "inputs": [{"name": "referrer", "type": "address"}],
  "outputs": [],
  "stateMutability": "payable"
}

Step 4 — Monitor your position

Poll GET /api/state every 60 seconds. If holder changes to a different address, you have been captured. Re-evaluate whether to recapture.

Step 5 — Claim winnings

If canClaim is true and you are the holder, call claimWinnings(). This pays out 95% of pot to you and holds 5% rollover for the next round. Anyone can call claimWinnings() — it is permissionless.

ABI for claimWinnings:

{
  "name": "claimWinnings",
  "type": "function",
  "inputs": [],
  "outputs": [],
  "stateMutability": "nonpayable"
}

Events to monitor

Subscribe to BagCaptured events for live game state without polling. Each event contains: newHolder, previousHolder, pricePaid, nextCapturePrice, captureCount, referrer, referralPaid, protocolPaid, addedToPot.

{
  "name": "BagCaptured",
  "type": "event",
  "inputs": [
    { "name": "roundNumber", "type": "uint256", "indexed": true },
    { "name": "newHolder", "type": "address", "indexed": true },
    { "name": "previousHolder", "type": "address", "indexed": true },
    { "name": "pricePaid", "type": "uint256", "indexed": false },
    { "name": "nextCapturePrice", "type": "uint256", "indexed": false },
    { "name": "captureCount", "type": "uint256", "indexed": false },
    { "name": "referrer", "type": "address", "indexed": false },
    { "name": "referralPaid", "type": "uint256", "indexed": false },
    { "name": "protocolPaid", "type": "uint256", "indexed": false },
    { "name": "addedToPot", "type": "uint256", "indexed": false }
  ]
}

Referral strategy

Pass the address of the most recent capturer as your referrer parameter. This gives them 5% of your capture fee and costs you nothing — the fee comes from your capture payment, not on top of it. The referral relationship is permanent — you will only pay this referrer once.

Fee structure

• Protocol fee: 5% of capture price (every capture)
• Referral fee: 5% of capture price (first capture by referred wallet only)
• To pot: 90% with referral, 95% without
• Winner payout: 95% of pot
• Rollover to next round: 5% of pot

Price escalation

Starting price is 0.01 ETH. Each capture multiplies the price by 1.15x. By capture #10 the price is ~0.035 ETH. By capture #20 it is ~0.142 ETH. By capture #30 it is ~0.579 ETH. The pot grows with each capture.

Quick reference