# Blockscout

> Blockscout MCP tool reference for on-chain data queries. Covers all 16 tools: address info, transactions, token transfers, NFTs, contract ABI/source, read-only calls, ENS resolution, and block data across 8+ chains. TRIGGER when: user asks about on-chain data, contract state, token balances, transaction history, ENS lookup, NFT holdings, or uses blockscout MCP tools. DO NOT TRIGGER when: user asks about crypto market prices or trading volume (use coingecko skill), or writing Solidity code (use solidity-auditor skill).

- Skill: `droodotfoo/blockscout` (Agent Skill, multi-file: 4 files)
- Install (CLI): `npx skillmds@latest add droodotfoo/blockscout`
- Raw SKILL.md: https://api.skillmd.com/api/skills/droodotfoo/blockscout/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: DROOdotFOO (https://skillmd.com/u/droodotfoo)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/droodotfoo/blockscout

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# Blockscout MCP

On-chain data queries via Blockscout MCP server (already configured).
16 tools across address intelligence, transactions, contracts, and blocks.

## Chain support

**EVM-only.** Blockscout covers 90+ EVM chains. Not available for native Solana
or Tron -- use CoinGecko contract endpoints for token data on those chains.

**Solana via Neon EVM**: Chain 245022934 covers the Neon EVM layer on Solana
(EVM-compatible contracts deployed on Solana).

### Common chain IDs

| Chain             | ID        | Chain        | ID     |
| ----------------- | --------- | ------------ | ------ |
| Ethereum          | 1         | Arbitrum One | 42161  |
| Polygon           | 137       | OP Mainnet   | 10     |
| Base              | 8453      | zkSync Era   | 324    |
| Gnosis            | 100       | Scroll       | 534352 |
| Celo              | 42220     | Mode         | 34443  |
| Neon EVM (Solana) | 245022934 | Filecoin     | 314    |
| Robinhood Chain   | 4663      |              |        |

Robinhood Chain (4663) is an Arbitrum Orbit L3 (native currency ETH), reachable by
chain_id like any other -- no instance URL needed.

Default: Ethereum (1). Use `get_chains_list` to discover all 90+ supported chains.

### Discover a chain ID

For any chain not in the table -- Orbit L3s, new rollups, or chains with their own
Blockscout instance (e.g. `robinhoodchain.blockscout.com`) -- pass a name substring to
`get_chains_list` instead of assuming it is unsupported:

```
get_chains_list(query="robinhood")
  -> { name: "Robinhood Chain", chain_id: "4663", ecosystem: "Arbitrum Orbit" }
```

If a chain has a Blockscout explorer, it is almost certainly reachable through the MCP
by chain_id -- you do not need the instance URL.

## Reference

| File                                     | Topic                                        |
| ---------------------------------------- | -------------------------------------------- |
| [tools-reference.md](tools-reference.md) | All 16 tools grouped by category             |
| [usage-patterns.md](usage-patterns.md)   | Common workflows, pagination, error handling |

## What You Get

- Reference documentation for all 16 Blockscout MCP tools covering address intelligence, transactions, contracts, and block data.
- Chain ID lookup tables and common usage patterns for querying on-chain state across 90+ EVM chains.
- Pagination handling, error recovery, and time-based query guidance for efficient data retrieval.

## See also

- `coingecko` -- market prices, volumes, DEX pools, trending tokens
- `sentinel` -- automated contract monitoring with alert rules
- `ethskills` -- framework selection, RPC providers, EIP/ERC standards
- `solidity-auditor` -- smart contract security patterns and audit methodology