Agent skill

Base Blockchain

Query Base (Ethereum L2) blockchain data — wallet balances, token info, transactions, gas analysis, contract inspection.

MITAuto-check passed

Install Base Blockchain

skills CLI

$ npx skills add AlexAI-MCP/hermes-CCC --skill base-blockchain -a claude-code

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

GitHub CLI

$ gh skill install AlexAI-MCP/hermes-CCC base-blockchain --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/AlexAI-MCP/hermes-CCC.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/base-blockchain .claude/skills/base-blockchain && 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/

Paste into Claude Code

Install the "base-blockchain" agent skill from https://github.com/AlexAI-MCP/hermes-CCC/tree/master/skills/base-blockchain into .claude/skills/base-blockchain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "base-blockchain", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/AlexAI-MCP/hermes-CCC/tree/master/skills/base-blockchain

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add AlexAI-MCP/hermes-CCC --skill base-blockchain -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install AlexAI-MCP/hermes-CCC base-blockchain --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AlexAI-MCP/hermes-CCC.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/base-blockchain .agents/skills/base-blockchain && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "base-blockchain" agent skill from https://github.com/AlexAI-MCP/hermes-CCC/tree/master/skills/base-blockchain into .agents/skills/base-blockchain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "base-blockchain", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add AlexAI-MCP/hermes-CCC --skill base-blockchain -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install AlexAI-MCP/hermes-CCC base-blockchain --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AlexAI-MCP/hermes-CCC.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/base-blockchain .cursor/skills/base-blockchain && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "base-blockchain" agent skill from https://github.com/AlexAI-MCP/hermes-CCC/tree/master/skills/base-blockchain into .cursor/skills/base-blockchain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "base-blockchain", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/AlexAI-MCP/hermes-CCC.git --path skills/base-blockchain

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add AlexAI-MCP/hermes-CCC --skill base-blockchain -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install AlexAI-MCP/hermes-CCC base-blockchain --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AlexAI-MCP/hermes-CCC.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/base-blockchain .gemini/skills/base-blockchain && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "base-blockchain" agent skill from https://github.com/AlexAI-MCP/hermes-CCC/tree/master/skills/base-blockchain into .gemini/skills/base-blockchain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "base-blockchain", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install AlexAI-MCP/hermes-CCC base-blockchain

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add AlexAI-MCP/hermes-CCC --skill base-blockchain -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/AlexAI-MCP/hermes-CCC.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/base-blockchain .github/skills/base-blockchain && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "base-blockchain" agent skill from https://github.com/AlexAI-MCP/hermes-CCC/tree/master/skills/base-blockchain into .github/skills/base-blockchain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "base-blockchain", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add AlexAI-MCP/hermes-CCC --skill base-blockchain -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install AlexAI-MCP/hermes-CCC base-blockchain --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/AlexAI-MCP/hermes-CCC.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/base-blockchain .opencode/skills/base-blockchain && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "base-blockchain" agent skill from https://github.com/AlexAI-MCP/hermes-CCC/tree/master/skills/base-blockchain into .opencode/skills/base-blockchain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "base-blockchain", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: base-blockchain
GitHub stars: 135
Token cost: ~941 tokens
SKILL.md length: 55 words
Files: 1
Skills in repo: 44
Repo updated: Apr 8, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Query Base (Ethereum L2) blockchain data — wallet balances, token info, transactions, gas analysis, contract inspection.

SKILL.md covers Base RPC Endpoints, Python Setup, Wallet Balance and ERC-20 Token Balance, plus 6 more sections
Reaches mainnet.base.org and sepolia.base.org

What it does

Base Blockchain is an agent skill from AlexAI-MCP/hermes-CCC. Query Base (Ethereum L2) blockchain data — wallet balances, token info, transactions, gas analysis, contract inspection. No API key required.

Its SKILL.md is about 940 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Ethereum. The repository describes itself as: Hermes Agent ported to Claude Code Channel — 46 native skills, no OAuth, no external process. The licence is MIT.

Example prompts

“/base-blockchain”

Requirements

Python 3
A credential in YOUR_KEY

What it can do on your machine

Read from SKILL.md and the folder at commit 8107e89. 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
No scripts in the folder and no shell commands in SKILL.md (its code samples are python).
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:
- mainnet.base.org
- sepolia.base.org
- api.coingecko.com
- api.basescan.org
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Base Blockchain loads about 941 tokens when it runs. Until then it costs about 39 tokens; SKILL.md has 55 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~39
When it runs · the whole SKILL.md, loaded when a task matches: ~941

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from AlexAI-MCP/hermes-CCC at commit 8107e89, republished under its MIT licence (© AlexAI-MCP). 55 words, ~941 tokens.

Download SKILL.mdSave it as .claude/skills/base-blockchain/SKILL.md (or your agent's skills folder).

name: base-blockchain
description: Query Base (Ethereum L2) blockchain data — wallet balances, token info, transactions, gas analysis, contract inspection. No API key required.
version: 1.0.0
author: hermes-CCC (ported from Hermes Agent by NousResearch)
license: MIT

Base Blockchain

Query Base (Ethereum L2) on-chain data enriched with USD pricing. No API key needed — uses public RPC + CoinGecko.

Base RPC Endpoints

Mainnet: https://mainnet.base.org
Testnet: https://sepolia.base.org
Chain ID: 8453 (mainnet) / 84532 (testnet)

Python Setup

python

import urllib.request, json

RPC = "https://mainnet.base.org"

def rpc_call(method, params=[]):
    payload = json.dumps({"jsonrpc":"2.0","method":method,"params":params,"id":1}).encode()
    req = urllib.request.Request(RPC, data=payload, headers={"Content-Type":"application/json"})
    with urllib.request.urlopen(req) as r:
        return json.loads(r.read())["result"]

Wallet Balance

python

def get_eth_balance(address):
    hex_balance = rpc_call("eth_getBalance", [address, "latest"])
    return int(hex_balance, 16) / 1e18

addr = "0xYourWalletAddress"
print(f"Balance: {get_eth_balance(addr):.6f} ETH")

ERC-20 Token Balance

python

# balanceOf(address) = keccak256 first 4 bytes = 0x70a08231
def get_token_balance(token_addr, wallet_addr, decimals=18):
    data = "0x70a08231" + wallet_addr[2:].zfill(64)
    result = rpc_call("eth_call", [{"to": token_addr, "data": data}, "latest"])
    return int(result, 16) / (10 ** decimals)

# USDC on Base (6 decimals)
usdc = "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
print(f"USDC: {get_token_balance(usdc, addr, decimals=6):.2f}")

Transaction Details

python

def get_tx(tx_hash):
    return rpc_call("eth_getTransactionByHash", [tx_hash])

def get_tx_receipt(tx_hash):
    return rpc_call("eth_getTransactionReceipt", [tx_hash])

tx = get_tx("0xabc123...")
print(f"From: {tx['from']}")
print(f"To: {tx['to']}")
print(f"Value: {int(tx['value'],16)/1e18} ETH")

Gas Analysis

python

def get_gas_price():
    hex_gas = rpc_call("eth_gasPrice")
    gwei = int(hex_gas, 16) / 1e9
    return gwei

print(f"Gas price: {get_gas_price():.2f} Gwei")

# Estimate gas for a transfer
def estimate_gas(from_addr, to_addr, value_eth):
    return rpc_call("eth_estimateGas", [{
        "from": from_addr,
        "to": to_addr,
        "value": hex(int(value_eth * 1e18))
    }])

ETH Price (CoinGecko)

python

def get_eth_price_usd():
    url = "https://api.coingecko.com/api/v3/simple/price?ids=ethereum&vs_currencies=usd"
    with urllib.request.urlopen(url) as r:
        return json.loads(r.read())["ethereum"]["usd"]

price = get_eth_price_usd()
balance = get_eth_balance(addr)
print(f"Portfolio: ${balance * price:.2f} USD")

Block Info

python

def get_latest_block():
    return rpc_call("eth_getBlockByNumber", ["latest", False])

block = get_latest_block()
print(f"Block: {int(block['number'],16)}")
print(f"Txs: {len(block['transactions'])}")

Contract Inspection

python

# Check if address is a contract
def is_contract(address):
    code = rpc_call("eth_getCode", [address, "latest"])
    return code != "0x"

# Read contract storage slot
def get_storage(address, slot):
    return rpc_call("eth_getStorageAt", [address, hex(slot), "latest"])

Basescan API (optional)

For detailed tx history, use Basescan API (free key at basescan.org):

python

BASESCAN = "https://api.basescan.org/api"
# Get tx list for address
params = f"?module=account&action=txlist&address={addr}&apikey=YOUR_KEY"

Files

Just SKILL.md in skills/base-blockchain of AlexAI-MCP/hermes-CCC.

Open the folder on GitHubat commit 8107e89

Compare with similar skills

Base Blockchain 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.

Base Blockchain compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Base Blockchain this skillAlexAI-MCP/hermes-CCC	135	—	~941	Automated safety check: Pass	MIT	6 mo ago
Wagmi Feature Developmentwevm/wagmi	6.8k	—	~3.8k	Automated safety check: Pass	MIT	8 days ago
Release Roundethereumjs/ethereumjs-monorepo	2.8k	—	~2k	Automated safety check: Pass	None	21 days ago
Update Est Fixturesethereumjs/ethereumjs-monorepo	2.8k	—	~3.3k	Automated safety check: Pass	None	21 days ago
Swapper Depositswapperfinance/swapper-toolkit	852	—	~1.8k	Automated safety check: Pass	MIT	6 mo ago
BNB Chain MCP Serverinternet-court/internet-court-skill	6.5k	1 repos	~1.7k	Automated safety check: Pass	MIT	1 mo ago

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Questions about Base Blockchain

What does Base Blockchain do?

Query Base (Ethereum L2) blockchain data — wallet balances, token info, transactions, gas analysis, contract inspection. Base Blockchain is an agent skill from AlexAI-MCP/hermes-CCC. Query Base (Ethereum L2) blockchain data — wallet balances, token info, transactions, gas analysis, contract inspection.

How do I install Base Blockchain in Claude Code?

Run `npx skills add AlexAI-MCP/hermes-CCC --skill base-blockchain -a claude-code`. Or copy the skill folder (skills/base-blockchain in AlexAI-MCP/hermes-CCC) into .claude/skills/base-blockchain in your project. Claude Code loads it when a task matches its description.

How do I install Base Blockchain in Codex?

Run `npx skills add AlexAI-MCP/hermes-CCC --skill base-blockchain -a codex`. Or copy the skill folder (skills/base-blockchain in AlexAI-MCP/hermes-CCC) into .agents/skills/base-blockchain in your project. Codex loads it when a task matches its description.

Can I use Base Blockchain 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 AlexAI-MCP/hermes-CCC --skill base-blockchain -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/base-blockchain, .gemini/skills/base-blockchain, .github/skills/base-blockchain and .opencode/skills/base-blockchain in your project.

What does Base Blockchain need to run?

SKILL.md names no scripts, command-line tools or credentials: Base Blockchain is instructions for the agent only. Our summary lists: Python 3; A credential in YOUR_KEY.

Does Base Blockchain access the network?

SKILL.md names 4 domains. In commands or code: mainnet.base.org, sepolia.base.org, api.coingecko.com and api.basescan.org; the agent is likely to contact these when it follows the instructions. This is read from the text; nothing was executed.

Is Base Blockchain 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. Review the folder before installing.

What licence does Base Blockchain use?

Base Blockchain is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Base Blockchain use?

About 941 tokens (SKILL.md is roughly 3.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Base Blockchain?

Skills that share tags, products or a category with Base Blockchain: Wagmi Feature Development (wevm/wagmi, 6.8k stars), Release Round (ethereumjs/ethereumjs-monorepo, 2.8k stars), Update Est Fixtures (ethereumjs/ethereumjs-monorepo, 2.8k stars) and Swapper Deposit (swapperfinance/swapper-toolkit, 852 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Base Blockchain?

AlexAI-MCP (a GitHub user) maintains it in AlexAI-MCP/hermes-CCC, which has 135 GitHub stars. The repository holds 44 skills in this directory. The repository was last updated on April 8, 2026.

Source: AlexAI-MCP/hermes-CCC on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Base Blockchain

Facts

At a glance

What it does

Example prompts

Requirements

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Base Blockchain

Base RPC Endpoints

Python Setup

Wallet Balance

ERC-20 Token Balance

Transaction Details

Gas Analysis

ETH Price (CoinGecko)

Block Info

Contract Inspection

Basescan API (optional)

Files

Compare with similar skills

Similar skills

More from AlexAI-MCP/hermes-CCC

Related

Questions about Base Blockchain