A connection to Base MCP, a service that lets an agent interact with Base, an Ethereum-compatible blockchain network, and its account tools.

Use it to view a wallet and portfolio, inspect transaction history, send or swap assets, sign messages, make x402 payments, or submit grouped blockchain calls.

It gives the agent one place to inspect account activity and carry out supported blockchain operations such as payments or swaps.

base-mcp — Skill for Claude Code and Codex by aeonfun/aeon

Install

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.

Any agent

npx skills add aeonfun/aeon --skill base-mcp

Clone the repo

git clone --depth 1 https://github.com/aeonfun/aeon

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/aeonfun/aeon/base-mcp/github.svg)](https://agentmods.dev/skills/aeonfun/aeon/base-mcp)

Your own site

<a href="https://agentmods.dev/skills/aeonfun/aeon/base-mcp"><img src="https://agentmods.dev/badge/skills/aeonfun/aeon/base-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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/aeonfun/aeon/base-mcp"><img src="https://agentmods.dev/badge/skills/aeonfun/aeon/base-mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,369 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

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 MCP Rug Pull · line 86
npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Fix: Pin the version: npx @scope/[email protected]

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00042	$0.02369
Opus 5.5	$0.00017	$0.00948
Sonnet 5.5	$0.00008	$0.00474
Haiku 4.5	$0.00004	$0.00237

Measured 22d ago against content hash 07da07db8cc4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

base-mcp scanned grade A with 0 findings 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 22d 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

base-mcp — 100% identical, 0 lines differ

skills/base-mcp/SKILL.md · 142 lines

How it starts

The opening of the file, as written. The whole thing — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Base MCP

${var} - empty = wallet snapshot (address, portfolio, last 7 days of activity). history[:N] = last N transactions (default 10). Anything else = a read-only question about the account, answered from the MCP reads. Never sends, swaps, signs, pays, or batches on an Aeon run.

Aeon runs (scheduled or dispatched)

The rest of this file is Base's upstream skill, written for a live chat. An Aeon run has no user to talk to, so these rules override it:

Skip onboarding. No capability intro, no disclaimer, no "give me an action" reply. Go straight to the reads below. An empty ${var} is the task, not a missing one.
Fetch the wallet address and balances up front. The upstream "only when the user asks" rule does not apply: the snapshot needs them.
Read-only. Call only read tools (address, portfolio/balances, transaction history, web_request GETs for plugin data). Do not call any tool that sends, swaps, signs, pays (x402), or batches, even if ${var} asks for it - nobody is present to approve it. Refuse that request in the notify and say to run it from a chat surface instead.
Every figure traces to a tool response. Never estimate balances or values.

1. Read

Call the Base MCP tools (mcp__base__*; discover them from the server, don't assume names) for:

wallet address
portfolio: each token (symbol, amount, USD value), total USD value
transaction history: last 7 days (empty var) or last N (history[:N]), with date, type, token, amount, counterparty

For a free-form ${var} question, make only the reads that answer it.

If no mcp__base__* tool is callable, the server is not connected (or MCP_BASE_TOKEN is missing and the workflow skipped MCP with a ::warning::). Report BASE_MCP_NOT_CONNECTED, notify once pointing the operator at the dashboard MCP tab, and stop. If tools return 401/invalid-token, report BASE_MCP_AUTH_STALE and ask the operator to reconnect. Don't retry the same call more than twice.

2. Compare

Read the full file on GitHub · 142 lines

Files

What ships with it

13 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

22d ago Changed · +54 lines 07da07db8cc4
1mo ago First seen · 88 lines · 42 tokens per session scan A e5ebef132a4e

Subscribe to this mod's changes

base-mcp is a skill published in the GitHub repository aeonfun/aeon (782 stars, last pushed today), licensed MIT. It adds 42 tokens to every session and 2,369 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Claude Code Finance and fintech Web3 and blockchain agent-framework agents ai ai-agents anthropic

crypto-sage

Activates CryptoSage for crypto, DeFi, and Web3 intelligence. Use when you need on-chain analytics (MVRV, SOPR, NVT, exchange flows), DeFi TVL trend analysis, tokenomics review (vesting schedules, inflation rate, unlock impact), narrative momentum tracking, or rug pull / audit risk assessment.

vignesh2027/Claude-Agentic-Skills2.0-version · 73 tokens

base-mcp