# Crypto & DeFi on-chain data tools

> Sandwich attacks and other MEV extraction quietly tax traders on decentralized exchanges. The tool in this category is a query builder for measuring that risk: choose a mode, a chain and token or pool addresses, and it assembles a ready-to-run configuration and previews a fixed example of the per-pair output, with fields such as the 24-hour sandwich rate, an MEV risk level and a fee breakdown. It does not read on-chain data in your browser. Field availability varies by chain and pool, and every output row says which data was available.

- URL: https://datatooly.xyz/category/crypto-defi/
- Tools: 1 (0 live, 1 query builder)
- Updated: 2026-09-29

## Tools

- [Scan DEX pairs for MEV & sandwich risk](https://datatooly.xyz/mev-pair-scanner-tool/) (query builder): Build a ready-to-run query for DEX sandwich attack MEV data — preview the per-pair output shape (sandwich rate, MEV fee ratio, risk level), then run it live.

## Guides

- [How to Check a DEX Pool's Sandwich Attack Rate (Python + API)](https://datatooly.xyz/guides/check-dex-pool-sandwich-attack-rate/): Measure how often a Uniswap, Raydium or Aerodrome pool gets sandwiched: pull per-hour sandwichRate and MEV fee data from Codex getBars in Python.

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