Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ccashwell/evm-cortex --skill blockscout-mcpgit clone --depth 1 https://github.com/ccashwell/evm-cortexWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ccashwell/evm-cortex/blockscout-mcp)<a href="https://agentmods.dev/skills/ccashwell/evm-cortex/blockscout-mcp"><img src="https://agentmods.dev/badge/skills/ccashwell/evm-cortex/blockscout-mcp/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/ccashwell/evm-cortex/blockscout-mcp"><img src="https://agentmods.dev/badge/skills/ccashwell/evm-cortex/blockscout-mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Data Exfiltration · line 28 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00038 | $0.01535 |
| Opus 5.5 | $0.00015 | $0.00614 |
| Sonnet 5.5 | $0.00008 | $0.00307 |
| Haiku 4.5 | $0.00004 | $0.00153 |
Grade A, and why
blockscout-mcp scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl "https://base.blockscout.com/api/v2/smart-contracts/0xContractAddress" How it starts
The opening of the file, as written. The whole thing — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Blockscout MCP Integration
Overview
Blockscout provides a comprehensive API for querying onchain data. Through MCP (Model Context Protocol), you can access contract sources, transaction details, address information, and event logs programmatically.
Blockscout API Endpoints
Base URLs by chain:
| Chain | Blockscout URL |
|---|---|
| Ethereum | https://eth.blockscout.com/api/v2 |
| Base | https://base.blockscout.com/api/v2 |
| Optimism | https://optimism.blockscout.com/api/v2 |
| Arbitrum | https://arbitrum.blockscout.com/api/v2 |
| Gnosis | https://gnosis.blockscout.com/api/v2 |
Contract Source Retrieval
# Get verified contract source via API
curl "https://base.blockscout.com/api/v2/smart-contracts/0xContractAddress"
# Response includes:
# - source_code: full Solidity source
# - abi: contract ABI
# - compiler_version
# - optimization_enabled
# - constructor_args
Using cast:
# Download source from Blockscout-indexed chain
cast etherscan-source 0xContractAddress \
--chain base \
-d ./downloaded-source
Address Queries
# Get address info (balance, tx count, token balances)
curl "https://base.blockscout.com/api/v2/addresses/0xAddress"
# Get token balances for an address
curl "https://base.blockscout.com/api/v2/addresses/0xAddress/token-balances"
# Get address transactions
curl "https://base.blockscout.com/api/v2/addresses/0xAddress/transactions"
# Get internal transactions
curl "https://base.blockscout.com/api/v2/addresses/0xAddress/internal-transactions"
# Get token transfers
curl "https://base.blockscout.com/api/v2/addresses/0xAddress/token-transfers"
Transaction Analysis
# Get transaction details
curl "https://base.blockscout.com/api/v2/transactions/0xTxHash"
# Get transaction logs (events)
curl "https://base.blockscout.com/api/v2/transactions/0xTxHash/logs"
# Get internal transactions for a tx
curl "https://base.blockscout.com/api/v2/transactions/0xTxHash/internal-transactions"
# Get token transfers in a transaction
curl "https://base.blockscout.com/api/v2/transactions/0xTxHash/token-transfers"
# Get transaction state changes
curl "https://base.blockscout.com/api/v2/transactions/0xTxHash/state-changes"
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 195 lines · 38 tokens per session scan A 6dccbee54809
blockscout-mcp is a skill published in the GitHub repository ccashwell/evm-cortex (131 stars, last pushed 17d ago), licensed MIT. It adds 38 tokens to every session and 1,535 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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