What is evm-swiss-knife?

A command-line skill for querying and using EVM-compatible blockchains, including Ethereum and similar networks, through Foundry’s cast tool.

Checking balances, reading contract data, calling contracts, sending funds or transactions, and inspecting blockchain networks.

It removes the need to remember and assemble cast commands for common blockchain tasks. It still requires Foundry, an RPC endpoint, and a private key for transactions.

evm-swiss-knife — Skill for Claude Code and Codex by kukapay

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 kukapay/crypto-skills --skill evm-swiss-knife

Clone the repo

git clone --depth 1 https://github.com/kukapay/crypto-skills

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/kukapay/crypto-skills/evm-swiss-knife/github.svg)](https://agentmods.dev/skills/kukapay/crypto-skills/evm-swiss-knife)

Your own site

<a href="https://agentmods.dev/skills/kukapay/crypto-skills/evm-swiss-knife"><img src="https://agentmods.dev/badge/skills/kukapay/crypto-skills/evm-swiss-knife/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/kukapay/crypto-skills/evm-swiss-knife"><img src="https://agentmods.dev/badge/skills/kukapay/crypto-skills/evm-swiss-knife.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 65 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,367 The whole file, excluding the scripts and references it only reads on demand.

Security scan C 2 findings. 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.

Model	Per session	Once invoked
Fable 5.1	$0.00065	$0.01367
Opus 5	$0.00032	$0.00683
Sonnet 5	$0.00013	$0.00273
Haiku 4.5	$0.00006	$0.00137

Measured 12d ago against content hash 925c751d8959, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade C, and why

evm-swiss-knife scanned grade C with 2 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 12d 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

curl -L https://foundry.paradigm.xyz | bash

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -L https://foundry.paradigm.xyz | bash

skills/evm-swiss-knife/SKILL.md · 196 lines

How it starts

The opening of the file, as written. The whole thing — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.

EVM Swiss Knife

This skill enables interaction with EVM-compatible blockchains through Foundry's cast command-line tool. It covers common blockchain operations like balance queries, contract calls, transaction sending, and network inspection.

Installation

To use this skill, you need Foundry installed, which provides the cast command.

Follow the official installation guide: https://getfoundry.sh/introduction/installation

Quick Install (Linux/Mac)

Install Foundryup:

curl -L https://foundry.paradigm.xyz | bash

Source your shell configuration or start a new terminal:
```
source ~/.bashrc  # or ~/.zshrc
```
Install Foundry:
```
foundryup
```
Verify installation:
```
cast --version
```

For other platforms or detailed instructions, see the full guide at https://getfoundry.sh/introduction/installation

Prerequisites

Foundry installed (cast command available)
RPC endpoint configured (via --rpc-url or environment variables)
Private key for transaction operations (if sending txs)

RPC URL Selection

To interact with different EVM networks, you need reliable RPC endpoints. Use ChainList's API at https://chainlist.org/rpcs.json to get a comprehensive JSON list of RPC URLs for all supported chains.

How to Select RPC URLs:

Fetch the RPC data:

curl -s https://chainlist.org/rpcs.json | jq '.[] | select(.chainId == 1)'  # For Ethereum (chain ID 1)

Look for RPC URLs that are:
- Public and free: No API keys required
- No or limited tracking: Avoid URLs with "tracking": "yes"
- Fast and reliable: Prefer URLs with low latency or high score
- Open source: Prefer community-maintained endpoints
Popular choices (extracted from ChainList):
- Ethereum (ID 1): https://ethereum-rpc.publicnode.com
- BNB Smart Chain (ID 56): https://bsc-dataseed.binance.org
- Base (ID 8453): https://mainnet.base.org
- Polygon (ID 137): https://polygon-rpc.com

Read the full file on GitHub · 196 lines

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.

12d ago First seen · 196 lines · 65 tokens per session scan C 925c751d8959

Subscribe to this mod's changes

evm-swiss-knife is a skill published in the GitHub repository kukapay/crypto-skills (36 stars, last pushed 4mo ago), licensed MIT. It adds 65 tokens to every session and 1,367 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Web3 and blockchain

signature-replay

Signature replay attacks — missing nonces, missing chain ID, ecrecover zero address, signature malleability, cross-chain replay.

PurpleAILAB/Decepticon · 31 tokens

official-sui-skills

Pointer to the official Mysten Labs skills for building on Sui — language fundamentals, object model, PTBs, SDKs, publishing, upgrades, frontend integration, accessing on-chain data. Maintained upstream at github.com/MystenLabs/skills; pinned to the same ref the audit catalog derives from (see…

MystenLabs/sui · 116 tokens

bridge

Cross-chain token transfers using Wormhole and CCTP.

alsk1992/CloddsBot · 13 tokens

onchainkit

Build onchain apps with Coinbase's OnchainKit React components - wallets, swaps, NFTs, payments.

alsk1992/CloddsBot · 24 tokens

marginfi

MarginFi — Solana lending and borrowing.

alsk1992/CloddsBot · 11 tokens

crypto-market-rank

Crypto market rankings and leaderboards. Query trending tokens, top searched tokens, Binance Alpha tokens, tokenized stocks, social hype sentiment ranks, smart money inflow token rankings, top meme token rankings from Pulse launchpad, and top trader PnL leaderboards. Use this skill when users ask about token rankings…

tradecatlabs/tradecat-public · 85 tokens

evm-swiss-knife