pinion-balance

pinion-balance is a skill for Claude Code from chu2bard/pinion-os. It costs 29 tokens per session (352 once invoked), scanned A, original, MIT.

A paid lookup for the ETH and USDC balances of any Ethereum address on Base, an Ethereum network. Each request costs $0.01 in USDC.

In plain words
What is it for?
Use it to inspect a Base wallet's ETH and USDC holdings or check whether an agent has enough funds.
Why use it?
It lets you check wallet funds before sending money or trading, and confirm whether a payment arrived. Payment is handled through x402, a protocol that returns payment instructions before the request succeeds.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: positional $N argument.

Part of the pinion-os plugin — 10 skills shipped together

Good fit Use it to inspect a Base wallet's ETH and USDC holdings or check whether an agent has enough funds.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/chu2bard/pinion-os/balance
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 chu2bard/pinion-os --skill balance
Clone the repo
git clone --depth 1 https://github.com/chu2bard/pinion-os

Made for: Claude Code.

Or install pinion-os, the plugin that ships this one along with the rest of its 10 skills.

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.

agentmods badge for pinion-balance

README.md
[![agentmods](https://agentmods.dev/badge/skills/chu2bard/pinion-os/balance.svg)](https://agentmods.dev/skills/chu2bard/pinion-os/balance)
Your own site
<a href="https://agentmods.dev/skills/chu2bard/pinion-os/balance"><img src="https://agentmods.dev/badge/skills/chu2bard/pinion-os/balance.svg" alt="Measured on agentmods" height="20"></a>
Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 352 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00029 $0.00352
Opus 5 $0.00015 $0.00176
Sonnet 5 $0.00006 $0.00070
Haiku 4.5 $0.00003 $0.00035

Measured 8d ago against content hash afd5a529fc42, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

pinion-balance 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 8d 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://pinionos.com/skill/balance/0x101Cd32b9bEEE93845Ead7Bc604a5F1873330acf
skills/balance/SKILL.md · 51 lines

What it actually says

Balance Lookup

Returns ETH and USDC balances for any address on Base mainnet.

Endpoint

GET https://pinionos.com/skill/balance/:address

Price: $0.01 USDC per call (x402 on Base)

Parameters

Parameter Type Required Description
address string yes Ethereum address (0x, 40 hex chars)

Example Request

curl https://pinionos.com/skill/balance/0x101Cd32b9bEEE93845Ead7Bc604a5F1873330acf

The first request returns HTTP 402 with payment requirements. Sign a USDC TransferWithAuthorization (EIP-3009) and retry with the X-PAYMENT header.

Example Response

{
  "address": "0x101Cd32b9bEEE93845Ead7Bc604a5F1873330acf",
  "network": "base",
  "balances": {
    "ETH": "0.042100",
    "USDC": "12.50"
  },
  "timestamp": "2026-02-16T12:00:00.000Z"
}

When to Use

  • Check any wallet's ETH and USDC holdings on Base before sending or trading.
  • Verify an agent's funding level.
  • Confirm a payment was received.
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.

  1. 8d ago First seen · 51 lines · 29 tokens per session scan A afd5a529fc42

Subscribe to this mod's changes

pinion-balance is a skill published in the GitHub repository chu2bard/pinion-os (96 stars, last pushed 6mo ago), licensed MIT. It adds 29 tokens to every session and 352 once invoked, about $0.0001 per session on Opus 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 2026-08-30.

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