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.
npx skills add Uniswap/uniswap-ai --skill viem-integrationgit clone --depth 1 https://github.com/Uniswap/uniswap-aiWrote 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.
[](https://agentmods.dev/skills/uniswap/uniswap-ai/viem-integration)<a href="https://agentmods.dev/skills/uniswap/uniswap-ai/viem-integration"><img src="https://agentmods.dev/badge/skills/uniswap/uniswap-ai/viem-integration/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.
<a href="https://agentmods.dev/skills/uniswap/uniswap-ai/viem-integration"><img src="https://agentmods.dev/badge/skills/uniswap/uniswap-ai/viem-integration.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- NVIDIA SkillSpector warn
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 Excessive Agency · line 5 Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
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 | $0.00069 | $0.01896 |
| Opus 5 | $0.00034 | $0.00948 |
| Sonnet 5 | $0.00014 | $0.00379 |
| Haiku 4.5 | $0.00007 | $0.00190 |
Grade A, and why
viem-integration 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 11d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- viem-v2 — 86% identical, 12 lines differ
How it starts
The opening of the file, as written. The whole thing — 271 lines — stays where its author put it; the contents beside it link to each section on GitHub.
viem Integration
Integrate EVM blockchains using viem for TypeScript/JavaScript applications.
Quick Decision Guide
| Building... | Use This |
|---|---|
| Node.js script/backend | viem with http transport |
| React/Next.js frontend | wagmi hooks (built on viem) |
| Real-time event monitoring | viem with webSocket transport |
| Browser wallet integration | wagmi or viem custom transport |
Installation
# Core library
npm install viem
# For React apps, also install wagmi
npm install wagmi viem @tanstack/react-query
Core Concepts
Clients
viem uses two client types:
| Client | Purpose | Example Use |
|---|---|---|
| PublicClient | Read-only operations | Get balances, read contracts, fetch logs |
| WalletClient | Write operations | Send transactions, sign messages |
Transports
| Transport | Use Case |
|---|---|
http() |
Standard RPC calls (most common) |
webSocket() |
Real-time event subscriptions |
custom() |
Browser wallets (window.ethereum) |
Chains
viem includes 50+ chain definitions. Import from viem/chains:
import { mainnet, arbitrum, optimism, base, polygon } from 'viem/chains';
Input Validation Rules
Before interpolating ANY user-provided value into generated TypeScript code:
- Ethereum addresses: MUST match
^0x[a-fA-F0-9]{40}$— use viem'sisAddress()for validation - Chain IDs: MUST be from viem's supported chain definitions
- Private keys: MUST NEVER be hardcoded — always use
process.env.PRIVATE_KEYwith runtime validation - RPC URLs: MUST use
https://orwss://protocols only - ABI inputs: Validate types match expected Solidity types before encoding
What ships with it
6 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.
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.
- 11d ago First seen · 271 lines · 69 tokens per session scan A 25eac48a94f7
viem-integration is a skill published in the GitHub repository Uniswap/uniswap-ai (230 stars, last pushed today), licensed MIT. It adds 69 tokens to every session and 1,896 once invoked, about $0.0003 per session on Opus 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.
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