Yoink
- 1 installs
- 1.2k repo stars
- Updated August 1, 2026
- bankrbot/clawdbot-skill
Yoink is a Claude skill for playing Yoink, an onchain capture-the-flag game on Base, by reading game state and submitting the yoink transaction via Bankr.
About
Yoink is a skill for playing Yoink, an onchain capture-the-flag game on Base. A developer or agent uses it to check who holds the flag and cooldown status, read scores and the leaderboard, and submit a yoink to take the flag. Game state is read via RPC with curl and jq and the transaction is sent through Bankr, so it matters when an agent wants to compete for the trophy.
- Play Yoink, an onchain capture-the-flag game on Base
- Reads game state (holder, cooldown, scores, leaderboard) via eth_call with curl and jq
- Submits the yoink() transaction through Bankr's arbitrary transaction feature
Yoink by the numbers
- 1 all-time installs (skills.sh)
- Ranked #426 of 479 Web3 & Blockchain skills by installs in the Skillselion catalog
- Data as of Aug 4, 2026 (Skillselion catalog sync)
yoink capabilities & compatibility
Needs a Bankr wallet and a small amount of ETH on Base for gas; reads use a free public RPC
- Capabilities
- onchain game · bankr transaction · leaderboard read
- Pricing
- Bring your own API key
What yoink says it does
Play Yoink, an onchain capture-the-flag game on Base. Yoink the flag from the current holder to start your clock.
Cooldown** - You must wait 10 minutes (600 seconds) between yoinks
The player with the most total yoinks holds the trophy (token ID 2)
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| Installs | 1 |
|---|---|
| repo stars | ★ 1.2k |
| Last updated | August 1, 2026 |
| Repository | bankrbot/clawdbot-skill ↗ |
What it does
Play the onchain capture-the-flag game Yoink on Base: check status, read scores, and yoink the flag via Bankr.
Who is it for?
agents competing in the onchain Yoink capture-the-flag game on Base
When should I use this skill?
when the user wants to yoink the flag, check game stats, view leaderboards, or player scores
What you get
A submitted yoink that takes the flag and updates the agent's score.
- yoink transaction
- game status query
- score lookup
By the numbers
- 600-second (10-minute) cooldown
- 9 contract functions documented
- trophy is token ID 2
Files
Yoink
Play Yoink, an onchain capture-the-flag game on Base. Yoink the flag from the current holder to start your clock. The player with the most total yoinks holds the trophy.
Contract: 0x4bBFD120d9f352A0BEd7a014bd67913a2007a878 on Base (chain ID 8453)
Game Rules
1. Yoink the flag - Call yoink() to take the flag from the current holder 2. Cooldown - You must wait 10 minutes (600 seconds) between yoinks 3. No self-yoink - You cannot yoink from yourself 4. Accumulate time - While you hold the flag, your time score increases 5. Compete for trophy - The player with the most total yoinks holds the trophy (token ID 2) 6. Track yoinks - Your total yoink count is tracked separately from time
Contract Interface
RPC template:
curl -s -X POST https://mainnet.base.org -H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0x4bBFD120d9f352A0BEd7a014bd67913a2007a878","data":"SELECTOR+PARAMS"},"latest"],"id":1}' | jq -r '.result'| Function | Selector | Params | Returns |
|---|---|---|---|
yoink() | 0x9846cd9e | - | (write) |
lastYoinkedBy() | 0xd4dbf9f4 | - | address |
lastYoinkedAt() | 0x6a99616f | - | uint256 timestamp |
totalYoinks() | 0xa5d0dadd | - | uint256 |
topYoinker() | 0x6a974e6e | - | address (trophy holder) |
mostYoinks() | 0xd2d7774a | - | uint256 (record) |
COOLDOWN() | 0xa2724a4d | - | uint256 (600) |
score(address) | 0x776f3843 | addr (32B padded) | (yoinks, time, lastYoinkedAt) |
balanceOf(address,uint256) | 0x00fdd58e | addr + tokenId | uint256 (FLAG_ID=1, TROPHY_ID=2) |
Encoding: Addresses are zero-padded to 32 bytes. score() returns 96 bytes (3 × uint256).
Yoinking
Use Bankr's arbitrary transaction feature:
{
"to": "0x4bBFD120d9f352A0BEd7a014bd67913a2007a878",
"data": "0x9846cd9e",
"value": "0",
"chainId": 8453
}Errors
| Error | Selector | Meaning |
|---|---|---|
SlowDown(uint256) | 0x58d6f4c6 | Cooldown not elapsed. Param = seconds remaining. |
Unauthorized() | 0x82b42900 | You already hold the flag. |
Cooldown check: current_time - lastYoinkedAt() >= 600
Workflow
- Query
lastYoinkedBy()andlastYoinkedAt()to check status/cooldown - Ensure cooldown elapsed (600s) and you're not current holder
- Submit yoink transaction via Bankr
- Verify with
lastYoinkedBy()orscore(address)
Resources
- Basescan: https://basescan.org/address/0x4bBFD120d9f352A0BEd7a014bd67913a2007a878 (ABI, events, source)
- Source Code: https://github.com/horsefacts/yoink-contracts
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What is the Yoink cooldown?
You must wait 10 minutes (600 seconds) between yoinks.
How is a yoink submitted?
As an arbitrary transaction to the contract on chain 8453, executed through Bankr.