NFT Floor Price Checker

WHAT IT DOES

NFT Floor Price Checker is a read-only tool that estimates the floor price of any ERC-721 or ERC-1155 NFT collection by scanning on-chain transfer events and extracting ETH sale amounts. It retrieves the collection contract address, token IDs, transfer history, transaction amounts, block timestamps, and token ownership patterns. The tool automatically identifies sales by detecting ETH value attached to Transfer transactions, then aggregates them to find the lowest price paid for any token in the collection. It displays the estimated floor price, the average of the five lowest sales, and a detailed list of recent sales with token IDs and transaction links.

HOW TO USE

Enter any NFT collection contract address and click Check Floor Price. The tool scans recent Transfer events, filtering out mints and burns, and looks for transactions that include ETH value. Sales are extracted, sorted by price, and analyzed to determine the current floor. Results include the collection name and symbol, estimated floor price in ETH, average of the five lowest sales, unique tokens detected, and a detailed list of recent sales with timestamps and clickable transaction hashes.

ADAPTIVE LOG-CHUNKING WITH BACKOFF

Public RPC providers enforce wildly different eth_getLogs block range limits — some allow 10,000 blocks, others cap at 1,000, and many reject requests that exceed their internal buffer. Instead of guessing a safe range and failing on the first rejection, this checker walks backwards from the latest block in dynamically sized chunks. When a request is rejected, the chunk size is halved and retried immediately. This guarantees that the scan completes on any provider without overwhelming the endpoint, and without giving up after a single refusal. The tool continues scanning until it has collected enough transfer events to provide a reliable floor price estimate, automatically adjusting chunk sizes to work within each provider's limits.

WHAT IT CANNOT SEE

This tool cannot detect off-chain sales or private transactions. It cannot show sale events that occurred before the contract was deployed. It cannot estimate true market liquidity or accurately detect wash trading without advanced pattern analysis. It cannot predict future floor prices or collection valuations. The tool can only detect sales that involve ETH sent directly in the same transaction as the Transfer event — sales made with WETH, ERC-20 tokens, or other assets will not be detected. It also cannot detect sales that occur through aggregators or marketplaces that use proxy contracts unless those proxy contracts emit standard Transfer events with ETH attached.

PLEASE NOTE

EVM ONLY. Supports all Ethereum-compatible networks (Ethereum, Goerli, Sepolia, Optimism, Arbitrum, Polygon, and others). This tool works best with ERC-721 collections that follow the standard Transfer event signature. For ERC-1155 collections, sales detection may be limited. No Solana, Tron, Starknet, SUI, TON, Aptos, Bitcoin, Cosmos, or XRP. Always cross-check with marketplaces and multiple sources before making purchasing decisions.