Pathfinder is a StarkNet full node giving you a safe view into StarkNet. With Pathfinder there is no need to trust information provided by others. Just run the node and query your own data.
Just go to GitHub, run the node, and query your own data.
Pathfinder gives you access to the full StarkNet state history, including contract code, storage, and transactions. Pathfinder calculates the StarkNet state's Patricia-Merkle Trie root on a block-by-block basis and confirms it against L1. This means the contract code and storage are locally verified.
You can call StarkNet contract functions against the local state using the Ethereum-like RPC API. This avoids incurring the cost of a StarkNet transaction as the call is performed locally only.
Pathfinder is authored and maintained by the team at Equilibrium.