A connection to Alchemy, a service that provides blockchain data and infrastructure through developer interfaces.

It helps with blockchain application tasks such as accessing on-chain data and managing connected Alchemy resources.

It gives an agent a defined way to read and write Alchemy data without guessing the required fields or values.

alchemy — Skill for Claude Code and Codex by withoneai: A connection to Alchemy, a service that provides blockchain…

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.

agentmods

npx agentmods add skills/withoneai/one-agent-plugin/alchemy

Any agent

npx skills add withoneai/one-agent-plugin --skill alchemy

Clone the repo

git clone --depth 1 https://github.com/withoneai/one-agent-plugin

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/withoneai/one-agent-plugin/alchemy.svg)](https://agentmods.dev/skills/withoneai/one-agent-plugin/alchemy)

Your own site

<a href="https://agentmods.dev/skills/withoneai/one-agent-plugin/alchemy"><img src="https://agentmods.dev/badge/skills/withoneai/one-agent-plugin/alchemy.svg" alt="Measured on agentmods" height="20"></a>

Per session 119 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 5,312 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

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	$0.00119	$0.05312
Opus 5	$0.00060	$0.02656
Sonnet 5	$0.00024	$0.01062
Haiku 4.5	$0.00012	$0.00531

Measured 3d ago against content hash ece5be47b868, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

alchemy 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 3d 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.

platforms/one-alchemy/skills/alchemy/SKILL.md · 193 lines

How it starts

The opening of the file, as written. The whole thing — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Alchemy through One

Alchemy is a blockchain developer platform that provides APIs, node infrastructure, SDKs, and monitoring tools for building, scaling, and operating applications on multiple blockchain networks, allowing developers to access onchain data and manage Web3 infrastructure more reliably.

One exposes Alchemy through four MCP tools. The table below carries real action ids from One's knowledge base, so for a common operation you can skip search and go straight to reading the action's parameters.

How to run an action

Find the action in the table below, or call search_one_platform_actions with platform alchemy if it is not listed.
Call get_one_action_knowledge with the action id. Do this every time, including for actions in this table. The table gives you the id, not the parameters.
Call execute_one_action with parameters copied from that knowledge.

Never guess a parameter name, a body field, or an enum value. The knowledge has the real schema, and a guessed field is either a 400 or a silent write of the wrong thing.

Before you start

Call list_one_integrations once and confirm Alchemy is connected. If it is missing, the user has not connected it: say so and point them at https://app.withone.ai rather than reaching for raw HTTP.

Each connection carries an access field. If it reports {"policy": "methods", "methods": ["GET"]} the agent is read-only here, so plan a read-only answer instead of attempting a write that will be refused.

Before a write

Creates, updates, deletes and sends land on a real Alchemy account and cannot be recalled. State the action and the specific target in one line before the first write in a task, and let the user stop you. Reads need no confirmation.

Actions

BlockTraces

Action	Method	Path	Action id
Abstract Mainnet - Trace Block	POST	`/v2`	`conn_mod_def::GLGBWxUhpYg::Q3iAEfQnSXOxHvdW3mPyEQ`
Abstract Mainnet - trace_rawTransaction	POST	`/v2`	`conn_mod_def::GLGBW6LF6AA::sQunEUeKQbCAjDm0ffYvCA`
Anime Mainnet - Trace a Raw Transaction	POST	`/v2`	`conn_mod_def::GLGBXdpUh1c::vvcns9p2SLqWUNenaORUHw`
ApeChain Mainnet - trace_block	POST	`/v2`	`conn_mod_def::GLGBX5dWKcU::qYYQeVEbQWm-dpaLHjoYTQ`
ApeChain Mainnet - trace_rawTransaction	POST	`/v2`	`conn_mod_def::GLGBYDGBQOw::ElK0RzmkQw2Ik74dtxVHyw`
Arbitrum Mainnet - trace_block	POST	`/v2`	`conn_mod_def::GLGBYe2EYm4::L8BmBzRQSOCzZiTqMhCFdg`
Arbitrum Mainnet - trace_rawTransaction	POST	`/v2`	`conn_mod_def::GLGBYeTAtw8::1D2Ude-nQOKRW7tkvLN3Ug`
Astar Mainnet - debug_traceBlockByNumber	POST	`/v2`	`conn_mod_def::GLGBYwrS4is::XffGzwzhQB-qbiyhn3z-NQ`
Astar Mainnet - trace_block	POST	`/v2`	`conn_mod_def::GLGBY7kunxU::MaFSEFC9S7mkwYwARxfxQg`
Astar Mainnet - trace_rawTransaction	POST	`/v2`	`conn_mod_def::GLGBZIui5X0::geUPczuwT1OP5AO4f97OxQ`
Avalanche C-Chain Mainnet - Trace Block	POST	`/v2`	`conn_mod_def::GLGBZhaDNx4::TIKResdYR8W9Zg0YZLeysQ`
Avalanche C-Chain Mainnet - Trace Block By Hash	POST	`/v2`	`conn_mod_def::GLGBZRpbFP0::E9anZkpdRFyDdLwHcnhtng`

Read the full file on GitHub · 193 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.

3d ago First seen · 193 lines · 0 tokens per session scan A ece5be47b868

Subscribe to this mod's changes

alchemy is a skill published in the GitHub repository withoneai/one-agent-plugin (1 stars, last pushed 14d ago), licensed MIT. It adds 119 tokens to every session and 5,312 once invoked, about $0.0006 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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