# Explorers overview (https://docs.ton.org/llms/onboarding/explorers/content.md)



Explorers are web tools designed for reading blockchain data, allowing users to look up accounts, transactions, blocks, and smart contracts. They provide a searchable user interface (UI) that indexes on-chain data, making it easy to verify activity and debug issues.

## What explorers show [#what-explorers-show]

In TON, explorers typically display account balances, transactions, tokens, contract code and state, as well as links to related blocks and messages.

More precisely, explorers show:

* Balances and assets: Grams, jettons (FTs), and NFTs held by an address
* Transactions and messages: history, fees, phases, and traces
* Blocks and validators: block contents, masterchain and shardchain details
* Smart contracts: code, state, disassembly, and known contract type
* Analytics: top entities, volumes, gas, fees, and network health

## Indexers [#indexers]

Indexers such as [TON Center API v3](https://docs.ton.org/llms/api/v3/overview/content.md) continuously read blocks from nodes, parse messages and transactions, and store them in a database optimized for queries. Explorers rely on these indexers to provide fast search, traces, higher-level events, and historical views beyond what a single node exposes by default.

## Examples [#examples]

[TON explorer](https://explorer.toncoin.org/) is a low-level developer-oriented explorer that displays transactions and blocks. It works on [mainnet](https://explorer.toncoin.org/) and [testnet](https://test-explorer.toncoin.org).

Discover other [TON explorers](https://duckduckgo.com/?q=ton+explorer).