Vickrey Auction Settlement Tool

WHAT IT DOES

Vickrey Auction Settlement Tool enables auction administrators to settle sealed-bid Vickrey auctions—also known as second-price auctions—where the winning bidder pays the second-highest bid price rather than their own bid. The tool reads the auction contract address, bidder addresses, sealed bid commitments, revealed bid amounts, and current block timestamp to determine the winner and the clearing price. It displays the highest bid, the second-highest bid (which becomes the clearing price), the winning bidder, and the status of the auction. Once confirmed, it executes settlement in a single batched transaction: transferring the auctioned token to the winning bidder at the second-price, refunding the excess amount to the winning bidder above the second price, and fully refunding all losing bidders.

HOW TO USE

Connect your wallet and select your network. Enter the Vickrey auction contract address and the auction token address. Click "Fetch auction data" to load all auction details including the total number of bidders, all bidder addresses and bid amounts, the highest bid, the second-highest bid (clearing price), the winning bidder, and the auction status. The tool displays a complete list of bidders with their bid amounts and whether they are the winner. Review the batch sender contract details including the contract address, owner, and fee. Click "Settle auction" to execute the settlement—this will transfer the token to the winner at the second price, refund the winner's excess, and refund all losing bidders in one batched transaction.

THE REAL MECHANISM — SECOND-PRICE CLEARING WITH BATCHED DISTRIBUTION

Unlike first-price auctions where winners pay their exact bid, Vickrey auctions use a second-price mechanism that incentivizes truthful bidding—bidders reveal their true valuation because they pay only the second-highest price. The tool computes the winning bidder by finding the highest bid among all revealed commitments. The clearing price is the second-highest bid amount. Settlement works as follows: the winner receives the auctioned token but pays only the second-highest bid price. The difference between the winner's bid and the second price is refunded to the winner. All losing bidders receive full refunds of their bid deposits. The tool uses the BotGentz sender contract to execute all transfers in a single batched transaction, significantly reducing gas costs compared to processing each refund individually. It reads fee() and owner() live from the sender contract, checks the total value against the sender's balance before execution, and uses receipt.effectiveGasPrice for accurate cost reporting.

WHAT IT CANNOT SEE

Cannot verify off-chain bidder identity—this tool has no visibility into whether bidders are legitimate, related parties, or engaging in collusion. It cannot ensure bidder commitment honesty—bidders could fail to reveal their commitments, disrupting the settlement process. It cannot predict future market prices—the clearing price is based on historical bids and may not reflect future market conditions. It cannot detect if the auction contract contains vulnerabilities or collusion risks—the tool does not audit the auction logic or verify its implementation. It cannot prevent bid sniping, last-minute commitment changes, or other manipulation tactics.

PLEASE NOTE — EVM CHAINS ONLY

This tool exclusively supports EVM-compatible chains where ethers.js can connect via standard JSON-RPC. It does not support non-EVM chains such as Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, or XRP. The auction contract must implement the specific interface expected by this tool (getAuctionInfo, getBidderCount, getBidder, getSecondPrice, getWinner, settle). The batch sender contract must be available on your selected chain—the tool uses the BotGentz registry and will notify you if unsupported. Always test with small amounts on a testnet before executing on mainnet. This tool is an auction settlement interface, not a financial advisor or investment strategist.