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 agentmods add skills/sablier-labs/plugin-marketplace/etherscan-verificationnpx skills add sablier-labs/plugin-marketplace --skill etherscan-verificationgit clone --depth 1 https://github.com/sablier-labs/plugin-marketplaceWrote 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/sablier-labs/plugin-marketplace/etherscan-verification)<a href="https://agentmods.dev/skills/sablier-labs/plugin-marketplace/etherscan-verification"><img src="https://agentmods.dev/badge/skills/sablier-labs/plugin-marketplace/etherscan-verification.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00067 | $0.00929 |
| Opus 5 | $0.00034 | $0.00464 |
| Sonnet 5 | $0.00013 | $0.00186 |
| Haiku 4.5 | $0.00007 | $0.00093 |
Grade A, and why
etherscan-verification 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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Overview
Contract verification on Etherscan-compatible explorers using Foundry's forge verify-contract. Covers standard
verification, unsupported chains via Etherscan V2 API, proxy patterns, and factory-created contracts.
When to Use
- Verify deployed smart contracts on Etherscan-compatible explorers
- Verify proxy contracts (ERC1967, UUPS)
- Verify factory-created contracts (CREATE2)
- Extract constructor arguments from deployment data
Prerequisites
| Requirement | How to Get |
|---|---|
| Foundry ≥1.3.6 | Run forge -V to check version |
| Contract address | From deployment broadcast or user |
| Chain ID | From explorer or network configuration |
| Explorer API key | From Etherscan account (works for V2 multi-chain) |
| Source code | Must match deployed bytecode exactly |
Version Check
Before proceeding, verify Foundry version:
forge -V
Stop if version is below 1.3.6.
Verification Methods
Method 1: Standard (Native Support)
For chains Foundry supports natively:
FOUNDRY_PROFILE=optimized forge verify-contract \
<CONTRACT_ADDRESS> \
src/<Contract>.sol:<Contract> \
--rpc-url <chain_name> \
--verifier etherscan \
--etherscan-api-key $ETHERSCAN_API_KEY \
--watch
Method 2: Etherscan V2 API (Unsupported Chains on Foundry)
When Foundry shows "No known Etherscan API URL for chain X":
FOUNDRY_PROFILE=optimized forge verify-contract \
<CONTRACT_ADDRESS> \
src/<Contract>.sol:<Contract> \
--verifier etherscan \
--verifier-url "https://api.etherscan.io/v2/api?chainid=<CHAIN_ID>" \
--etherscan-api-key $ETHERSCAN_API_KEY \
--watch
Supported chains: https://docs.etherscan.io/supported-chains
Method 3: With Constructor Arguments
For contracts with constructor parameters:
FOUNDRY_PROFILE=optimized forge verify-contract \
<CONTRACT_ADDRESS> \
src/<Contract>.sol:<Contract> \
--verifier etherscan \
--verifier-url "https://api.etherscan.io/v2/api?chainid=<CHAIN_ID>" \
--etherscan-api-key $ETHERSCAN_API_KEY \
--constructor-args <ABI_ENCODED_ARGS> \
--watch
What ships with it
4 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.
- 6d ago First seen · 137 lines · 67 tokens per session scan A 84bfbcf7e3ce
etherscan-verification is a skill published in the GitHub repository sablier-labs/plugin-marketplace (7 stars, last pushed 2mo ago), licensed MIT. It adds 67 tokens to every session and 929 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 2026-08-31.
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