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Agent skill

Etherscan MCP Skill

by holon-run in holon-run/uxc

Use Etherscan MCP through UXC for address balance checks, token holder analysis, transaction inspection, and contract lookup tasks.

MITAuto-check passedAgent Workflows

Install Etherscan MCP Skill

skills CLI
$ npx skills add holon-run/uxc --skill etherscan-mcp-skill -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install holon-run/uxc etherscan-mcp-skill --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/holon-run/uxc.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/etherscan-mcp-skill .claude/skills/etherscan-mcp-skill && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
etherscan-mcp-skill
GitHub stars
116
Token cost
~1.1k tokens
SKILL.md length
439 words
Files
4 (incl. scripts, references)
Skills in repo
62
Repo updated
First seen
Licence
MIT

At a glance

Use Etherscan MCP through UXC for address balance checks, token holder analysis, transaction inspection, and contract lookup tasks.

  • Works in 5 steps: Confirm endpoint and protocol with… → Configure credential/binding for… → Use fixed link command by default → …
  • Tasks need Etherscan MCP tools for onchain investigation with help-first schema inspection
  • SKILL.md covers Prerequisites, Core Workflow, Capability Map and Recommended Usage Pattern, plus 2 more sections
  • Runs Shell scripts from its folder; reaches mcp.etherscan.io; needs ETHERSCAN_API_KEY

What it does

Etherscan MCP Skill is an agent skill from holon-run/uxc. Use Etherscan MCP through UXC for address balance checks, token holder analysis, transaction inspection, and contract lookup tasks. Use when tasks need Etherscan MCP tools for onchain investigation with help-first schema inspection, bearer-key auth, and tier-aware read-first handling.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including scripts and reference files (for example `agents/openai.yaml`, `references/usage-patterns.md` and `scripts/validate.sh`).

It sits in Agent Workflows, covering MCP servers. It works with Model Context Protocol. The repository describes itself as: A unified CLI for discovering and invoking tools across OpenAPI, MCP, GraphQL, gRPC, and JSON-RPC. The licence is MIT.

When your agent uses it

  • Tasks need Etherscan MCP tools for onchain investigation with help-first schema inspection
  • Bearer-key auth
  • Tier-aware read-first handling

Example prompts

  • “/etherscan-mcp-skill”

Requirements

  • A Bash shell
  • A credential in ETHERSCAN_API_KEY

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Confirm endpoint and protocol with help-first probing
  2. Configure credential/binding for repeatable auth
  3. Use fixed link command by default
  4. Inspect operation schema before execution
  5. Prefer read operations first, then any workflow that could trigger heavy data pulls or follow-up automation.

What it can do on your machine

Read from SKILL.md and the folder at commit 562d47c. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 1 file in scripts/ (Shell), which the agent can run.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • mcp.etherscan.io

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • ETHERSCAN_API_KEY

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Etherscan MCP Skill loads about 1.1k tokens when it runs, and up to ~2k if it reads all its reference files. Until then it costs about 76 tokens; SKILL.md has 439 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~76
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from holon-run/uxc at commit 562d47c, republished under its MIT licence (© holon-run). 439 words, ~1,062 tokens.

Download SKILL.mdSave it as .claude/skills/etherscan-mcp-skill/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
etherscan-mcp-skill
description
Use Etherscan MCP through UXC for address balance checks, token holder analysis, transaction inspection, and contract lookup tasks. Use when tasks need Etherscan MCP tools for onchain investigation with help-first schema inspection, bearer-key auth, and tier-aware read-first handling.

Etherscan MCP Skill

Use this skill to run Etherscan MCP operations through uxc.

Reuse the uxc skill for shared protocol discovery, output parsing, and generic auth/binding flows.

Prerequisites

  • uxc is installed and available in PATH.
  • Network access to https://mcp.etherscan.io/mcp.
  • An Etherscan API key is available for authenticated calls.

Core Workflow

  1. Confirm endpoint and protocol with help-first probing:
    • uxc https://mcp.etherscan.io/mcp -h
    • expected unauthenticated behavior today: 401 Unauthorized
  2. Configure credential/binding for repeatable auth:
    • uxc auth credential set etherscan-mcp --auth-type bearer --secret-env ETHERSCAN_API_KEY
    • uxc auth credential set etherscan-mcp --auth-type bearer --secret-op op://Engineering/etherscan/api-key
    • uxc auth binding add --id etherscan-mcp --host mcp.etherscan.io --path-prefix /mcp --scheme https --credential etherscan-mcp --priority 100
  3. Use fixed link command by default:
    • command -v etherscan-mcp-cli
    • If missing, create it: uxc link etherscan-mcp-cli https://mcp.etherscan.io/mcp
    • etherscan-mcp-cli -h
  4. Inspect operation schema before execution:
    • etherscan-mcp-cli balance -h
    • etherscan-mcp-cli tokenTopHolders -h
    • etherscan-mcp-cli getContractAbi -h
    • etherscan-mcp-cli transaction -h
  5. Prefer read operations first, then any workflow that could trigger heavy data pulls or follow-up automation.

Capability Map

  • Address investigation:
    • balance
    • tokenHoldings
    • fundedBy
    • getAddressMetadata
  • Token holder analysis:
    • balanceERC20
    • balanceERC20Historical
    • tokenTopHolders
    • getTokenInfo
  • Transaction investigation:
    • txList
    • internalTxsByAddress
    • erc20Transfers
    • erc721Transfers
    • erc1155Transfers
    • transaction
    • checkTransaction
  • Contract research:
    • getContractAbi
    • getContractSourceCode
    • getContractCreation
  • Verification:
    • verifySourceCode
    • checkVerifyStatus

Inspect etherscan-mcp-cli -h after auth setup for the current full tool list. Etherscan can expand MCP tools independently of this wrapper skill.

  1. Start from a read-only investigation goal:
    • balance or holdings for an address
    • holder concentration for a token
    • transaction inspection for a hash
    • source/metadata lookup for a contract
  2. Run -h on the specific tool before the first real call.
  3. Prefer one chain/address/token at a time before broadening the scope.
  4. Parse the JSON envelope first, then inspect data.
Show full SKILL.md (160 more words)Show less

Guardrails

  • Keep automation on JSON output envelope; do not rely on --text.
  • Parse stable fields first: ok, kind, protocol, data, error.
  • Use etherscan-mcp-cli as default command path.
  • etherscan-mcp-cli <operation> ... is equivalent to uxc https://mcp.etherscan.io/mcp <operation> ....
  • If unauthenticated probe or runtime call returns 401 Unauthorized:
    • confirm auth binding matches endpoint with uxc auth binding match https://mcp.etherscan.io/mcp
    • confirm credential shape with uxc auth credential info etherscan-mcp
    • reset credential as bearer if needed: uxc auth credential set etherscan-mcp --auth-type bearer --secret-env ETHERSCAN_API_KEY
  • Use key=value only for simple scalar inputs.
  • Prefer positional JSON when an operation accepts nested objects, arrays, or optional flags that may evolve.
  • Do not assume tool argument names from memory; inspect <operation> -h first because Etherscan may revise MCP schemas independently of this skill.
  • Some MCP tools are tier-gated by Etherscan plan. Today getTokenInfo can return NOTOK with an API Pro upgrade message on non-Pro keys.
  • Treat verifySourceCode as a write-like action requiring explicit user confirmation.

References

  • Invocation patterns:
    • references/usage-patterns.md

© holon-run, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (scripts, references) in skills/etherscan-mcp-skill of holon-run/uxc.

  • SKILL.md
  • agents/openai.yaml
  • references/usage-patterns.md
  • scripts/validate.sh

Open the folder on GitHubat commit 562d47c

Compare with similar skills

Etherscan MCP Skill next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Etherscan MCP Skill compared with similar skills
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MCP Integration for Pluginsanthropics/claude-plugins-official38k11 repos~3.1kAutomated safety check: PassApache-2.0
Crush Configurationcharmbracelet/crush29k—~3.7kAutomated safety check: PassCustom licence
Context Mode Output Sandboxmksglu/context-mode26k—~4.1kAutomated safety check: PassCustom licence

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Works with

Categories

Questions about Etherscan MCP Skill

What does Etherscan MCP Skill do?

Use Etherscan MCP through UXC for address balance checks, token holder analysis, transaction inspection, and contract lookup tasks. Etherscan MCP Skill is an agent skill from holon-run/uxc. Use Etherscan MCP through UXC for address balance checks, token holder analysis, transaction inspection, and contract lookup tasks.

When should I use Etherscan MCP Skill?

Etherscan MCP Skill fits situations like: tasks need Etherscan MCP tools for onchain investigation with help-first schema inspection; bearer-key auth; tier-aware read-first handling.

How do I install Etherscan MCP Skill in Claude Code?

Run `npx skills add holon-run/uxc --skill etherscan-mcp-skill -a claude-code`. Or copy the skill folder (skills/etherscan-mcp-skill in holon-run/uxc) into .claude/skills/etherscan-mcp-skill in your project. Claude Code loads it when a task matches its description.

How do I install Etherscan MCP Skill in Codex?

Run `npx skills add holon-run/uxc --skill etherscan-mcp-skill -a codex`. Or copy the skill folder (skills/etherscan-mcp-skill in holon-run/uxc) into .agents/skills/etherscan-mcp-skill in your project. Codex loads it when a task matches its description.

Can I use Etherscan MCP Skill in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add holon-run/uxc --skill etherscan-mcp-skill -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/etherscan-mcp-skill, .gemini/skills/etherscan-mcp-skill, .github/skills/etherscan-mcp-skill and .opencode/skills/etherscan-mcp-skill in your project.

What does Etherscan MCP Skill need to run?

Going by SKILL.md and its folder, Etherscan MCP Skill needs a shell for the scripts in its folder and credentials named ETHERSCAN_API_KEY. Our summary lists: A Bash shell; A credential in ETHERSCAN_API_KEY.

Does Etherscan MCP Skill access the network?

SKILL.md names 1 domain. In commands or code: mcp.etherscan.io; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Etherscan MCP Skill safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Etherscan MCP Skill use?

Etherscan MCP Skill is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Etherscan MCP Skill use?

About 1.1k tokens (SKILL.md is roughly 4.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 901 tokens, read only when the agent opens those files.

What are the alternatives to Etherscan MCP Skill?

Skills that share tags, products or a category with Etherscan MCP Skill: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Crush Configuration (charmbracelet/crush, 29k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Etherscan MCP Skill?

holon-run (a GitHub organization) maintains it in holon-run/uxc, which has 116 GitHub stars. The repository holds 62 skills in this directory. The repository was last updated on September 15, 2026.

Source: holon-run/uxc on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.