# Blockchain & Web3 explorers

> A network of 15 focused, deterministic tools. Every tool has a human page, a JSON API, an OpenAPI description and an MCP tool that all return the same result (inputs, result, units, assumptions, sources, timestamps).

## Machine interfaces
- Tool catalog (JSON): https://web3.usefulweb.site/api/v1/tools
- OpenAPI (all tools): https://web3.usefulweb.site/openapi.json
- MCP server (all tools + workflows): https://web3.usefulweb.site/mcp
- Pick a tool for a natural-language request: POST https://web3.usefulweb.site/api/v1/tools/prompt-to-tool-router/calculate {"request": "..."}

## Tools
- [Account Abstraction Explorer](https://accountabstractionexplorer.usefulweb.site/): Decode ERC-4337 bundles: UserOperations, paymasters, gas per op, deployed smart accounts. API: POST https://web3.usefulweb.site/api/v1/tools/account-abstraction-explorer/calculate
- [Blockchain Incident Replay](https://blockchainincidentreplay.usefulweb.site/): Replay an exploit from tx hashes: ordered timeline, fund-flow graph and who profited. API: POST https://web3.usefulweb.site/api/v1/tools/blockchain-incident-replay/calculate
- [Bridge Transfer Tracker](https://bridgetransfertracker.usefulweb.site/): Where is my bridged money? Finds the bridge deposit in a transaction and checks if it arrived. API: POST https://web3.usefulweb.site/api/v1/tools/bridge-transfer-tracker/calculate
- [Cross-Chain Transaction Explorer](https://crosschaintransactionexplorer.usefulweb.site/): Follow one transaction across chains: source tx, bridge deposit and destination fill on a timeline. API: POST https://web3.usefulweb.site/api/v1/tools/cross-chain-transaction-explorer/calculate
- [DAO Governance Explorer](https://daogovernanceexplorer.usefulweb.site/): Snapshot proposals, vote concentration, Governor state and treasury balances in one view. API: POST https://web3.usefulweb.site/api/v1/tools/dao-governance-explorer/calculate
- [DeFi Liquidation Explorer](https://defiliquidationexplorer.usefulweb.site/): Recent Aave V3 liquidations in USD, who liquidated whom, and a live health-factor check. API: POST https://web3.usefulweb.site/api/v1/tools/defi-liquidation-explorer/calculate
- [Gas Fee Intelligence Explorer](https://gasfeeintelligenceexplorer.usefulweb.site/): Live gas on 7 EVM chains: base fee, tips, trend and the USD cost of transfers and swaps. API: POST https://web3.usefulweb.site/api/v1/tools/gas-fee-intelligence-explorer/calculate
- [MEV Explorer](https://mevexplorer.usefulweb.site/): Who extracted value in this block? Sandwiches, arbitrage, liquidations, builder and tips. API: POST https://web3.usefulweb.site/api/v1/tools/mev-explorer/calculate
- [Rollup Batch Explorer](https://rollupbatchexplorer.usefulweb.site/): How L2 transactions reach Ethereum: unsafe → safe → finalized, blobs, batch costs, withdrawal waits. API: POST https://web3.usefulweb.site/api/v1/tools/rollup-batch-explorer/calculate
- [Smart Contract Relationship Graph](https://smartcontractrelationshipgraph.usefulweb.site/): Map a contract's proxy, implementation, admin, owner, deployer/factory and token links as a graph. API: POST https://web3.usefulweb.site/api/v1/tools/smart-contract-relationship-graph/calculate
- [Smart Contract Upgrade Explorer](https://contractupgradeexplorer.usefulweb.site/): Is this smart contract upgradeable, who controls upgrades, and what changed? API: POST https://web3.usefulweb.site/api/v1/tools/contract-upgrade-explorer/calculate
- [Stablecoin Flow Explorer](https://stablecoinflowexplorer.usefulweb.site/): USDC/USDT supply per chain, recent mints, burns and whale transfers, cross-chain totals. API: POST https://web3.usefulweb.site/api/v1/tools/stablecoin-flow-explorer/calculate
- [Token Unlock Explorer](https://tokenunlockexplorer.usefulweb.site/): Model token vesting (cliff, linear, monthly, tranches, TGE) or audit a VestingWallet. API: POST https://web3.usefulweb.site/api/v1/tools/token-unlock-explorer/calculate
- [Transaction Decoder](https://transactiondecoder.usefulweb.site/): See what an EVM transaction actually did: call, events, token transfers, fee, finality. API: POST https://web3.usefulweb.site/api/v1/tools/transaction-decoder/calculate
- [Wallet Permission Explorer](https://walletpermissionexplorer.usefulweb.site/): Who can move your tokens? Allowances, Permit2, NFT operators and EIP-7702 delegation, with risk. API: POST https://web3.usefulweb.site/api/v1/tools/wallet-permission-explorer/calculate

## Workflows