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Agent skill

Alchemy Webhooks Events

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Operate Alchemy Notify webhooks with raw-body HMAC verification, idempotent intake, durable processing, and safe lifecycle changes.

MITAuto-check passedBackend & APIs

Install Alchemy Webhooks Events

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill alchemy-webhooks-events -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace alchemy-webhooks-events --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/alchemy-webhooks-events .claude/skills/alchemy-webhooks-events && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
alchemy-webhooks-events
GitHub stars
2.8k
Token cost
~1.3k tokens
SKILL.md length
540 words
Files
2 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Operate Alchemy Notify webhooks with raw-body HMAC verification, idempotent intake, durable processing, and safe lifecycle changes.

  • Works in 6 steps: Select the current webhook type and… → Create or modify the registration only… → Capture the raw request bytes before… → …
  • Repairing blockchain event delivery
  • SKILL.md covers Overview, Prerequisites, Current Contract and Authentication, plus 8 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Alchemy Webhooks Events is an agent skill from jeremylongshore/tons-of-skills-marketplace. Operate Alchemy Notify webhooks with raw-body HMAC verification, idempotent intake, durable processing, and safe lifecycle changes. Use when implementing or repairing blockchain event delivery. Trigger with "Alchemy webhook", "Alchemy Notify", or "verify X-Alchemy-Signature".

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/official-docs.md`). Compatibility notes: Designed for Claude Code; live Alchemy access requires network access, an appropriate credential, account capacity, and explicit approval

It sits in Backend & APIs, covering Webhooks. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • Repairing blockchain event delivery
  • With Alchemy webhook
  • Verify X-Alchemy-Signature

Example prompts

  • “Alchemy webhook”
  • “Alchemy Notify”
  • “verify X-Alchemy-Signature”
  • “/alchemy-webhooks-events”

Requirements

  • Compatibility (from SKILL.md): Designed for Claude Code; live Alchemy access requires network access, an appropriate credential, account capacity, and explicit approval
  • Pre-approved tools (allowed-tools): Read, Glob, Grep, Write, Edit

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Select the current webhook type and network from first-party support, define event semantics, confirmation policy, callback SLO, and data…
  2. Create or modify the registration only through an approved management path; record webhook ID, redacted filter, owner, signing-key…
  3. Capture the raw request bytes before JSON parsing, compute HMAC-SHA256, and compare decoded equal-length values with a timing-safe function.
  4. Persist the webhook and event identifiers atomically before acknowledging; enqueue work and return success without blocking on downstream…
  5. Make consumers idempotent, preserve per-entity ordering where required, and define reorganization, mined, dropped, and duplicate-event…
  6. Test valid, invalid, replayed, delayed, out-of-order, and downstream-failure cases; operate a bounded dead-letter replay with explicit…

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Glob
    • Grep
    • Write
    • Edit

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Designed for Claude Code; live Alchemy access requires network access, an appropriate credential, account capacity, and explicit approval

    From compatibility in the SKILL.md frontmatter.

Context cost

Alchemy Webhooks Events loads about 1.3k tokens when it runs, and up to ~2k if it reads all its reference files. Until then it costs about 75 tokens; SKILL.md has 540 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~75
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 540 words, ~1,256 tokens.

Download SKILL.mdSave it as .claude/skills/alchemy-webhooks-events/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
alchemy-webhooks-events
description
Operate Alchemy Notify webhooks with raw-body HMAC verification, idempotent intake, durable processing, and safe lifecycle changes. Use when implementing or repairing blockchain event delivery. Trigger with "Alchemy webhook", "Alchemy Notify", or "verify X-Alchemy-Signature".
allowed-tools
Read, Glob, Grep, Write, Edit
compatibility
Designed for Claude Code; live Alchemy access requires network access, an appropriate credential, account capacity, and explicit approval
argument-hint
<webhook-type> <network> <callback>
version
2.0.0
license
MIT
author
Jeremy Longshore <jeremy@intentsolutions.io>
tags
saas, alchemy, webhooks, events
model
inherit
effort
high

Alchemy Notify Webhook Operations

Overview

Operate Alchemy Notify webhooks with raw-body HMAC verification, idempotent intake, durable processing, and safe lifecycle changes. This workflow produces a reviewable artifact and negative-path evidence before any live side effect.

Prerequisites

  • Current first-party Alchemy documentation for the selected product, chain, feature, client, authentication method, limit, and lifecycle.
  • Named product, application, security, data/privacy, budget, release, and operations owners appropriate to the requested scope.
  • Synthetic or approved non-production fixtures, a credential canary, explicit success criteria, and a tested rollback boundary.

Current Contract

Alchemy signs the exact raw request body with HMAC-SHA256 using the webhook's signing key and sends the digest in X-Alchemy-Signature. Notify management uses its documented auth token, not the signing key. Current docs describe automatic retries/backoff and ordered first-time delivery; consumers still need idempotency because duplicate processing and application retries remain possible.

Authentication

Keep the per-webhook signing key and Notify management token in separate managed secrets. The receiver may read the signing key only for verification; it may not create, update, or delete webhook registrations.

Instructions

  1. Select the current webhook type and network from first-party support, define event semantics, confirmation policy, callback SLO, and data retention.
  2. Create or modify the registration only through an approved management path; record webhook ID, redacted filter, owner, signing-key version, and rollback configuration.
  3. Capture the raw request bytes before JSON parsing, compute HMAC-SHA256, and compare decoded equal-length values with a timing-safe function.
  4. Persist the webhook and event identifiers atomically before acknowledging; enqueue work and return success without blocking on downstream side effects.
  5. Make consumers idempotent, preserve per-entity ordering where required, and define reorganization, mined, dropped, and duplicate-event behavior.
  6. Test valid, invalid, replayed, delayed, out-of-order, and downstream-failure cases; operate a bounded dead-letter replay with explicit approval.

Tool Discipline

Use Read, Glob, and Grep to inspect current documentation, configuration, code, fixtures, and evidence. Use Write and Edit only for approved repository artifacts. Skill invocation alone does not authorize network access, credentials, wallet addresses, customer data, plan changes, spend, key creation or rotation, webhook changes, deployment, replay, transaction construction, signing, broadcast, or deletion.

Show full SKILL.md (194 more words)Show less

Approval Boundaries

The product owner approves event scope and user impact. Security approves callback exposure and secret storage. Creating, changing, deleting, replaying, or rotating a production webhook requires explicit owner approval.

Error Handling

  • Reject a missing, malformed, or mismatched signature before parsing or side effects.
  • Do not use the Notify management token as the HMAC signing key.
  • A duplicate-safe acknowledgement is preferable to repeating a user-visible side effect.

Output

Return the event contract, registration receipt, raw-body verifier, idempotency key and storage design, acknowledgement SLO, ordering/reorg policy, replay runbook, tests, and rollback. Mark assumptions, observations, source dates, environment-specific behavior, owners, and unresolved gaps explicitly.

Examples

  • Accept one synthetic signed Address Activity event, then acknowledge its exact duplicate without repeating a notification.
  • Quarantine a valid event when downstream processing fails and replay it only after the fault and approval boundary are resolved.

Validation

Exercise and record expected and observed results for:

  • valid signature
  • wrong signing key
  • body changed after signing
  • duplicate event
  • out-of-order event
  • downstream failure and replay

Resources

  • Current first-party evidence map — recheck dated Alchemy sources before execution.
  • Treat observed account, application, network, indexer, chain, or provider behavior as environment-specific evidence, never a universal guarantee.

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in skills/.curated/alchemy-webhooks-events of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • references/official-docs.md

Open the folder on GitHubat commit cfae287

Compare with similar skills

Alchemy Webhooks Events next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Alchemy Webhooks Events compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Alchemy Webhooks Events this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.3kAutomated safety check: PassMIT
Novu Design Workflownovuhq/novu40k—~2.6kAutomated safety check: PassCustom licence
Golivemikehasa/golive-skill1.3k—~13kAutomated safety check: NotesMIT
Stripe Appsfossasia/eventyay1.7k1 repos~3.6kAutomated safety check: PassApache-2.0
Dingtalk Messageagentscope-ai/ReMe3.6k—~1.6kAutomated safety check: PassApache-2.0
PR Review Provideryansongda/pay5.4k—~2.4kAutomated safety check: PassMIT

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Categories

Questions about Alchemy Webhooks Events

What does Alchemy Webhooks Events do?

Operate Alchemy Notify webhooks with raw-body HMAC verification, idempotent intake, durable processing, and safe lifecycle changes. Alchemy Webhooks Events is an agent skill from jeremylongshore/tons-of-skills-marketplace. Operate Alchemy Notify webhooks with raw-body HMAC verification, idempotent intake, durable processing, and safe lifecycle changes.

When should I use Alchemy Webhooks Events?

Alchemy Webhooks Events fits situations like: repairing blockchain event delivery; with Alchemy webhook; verify X-Alchemy-Signature.

How do I install Alchemy Webhooks Events in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill alchemy-webhooks-events -a claude-code`. Or copy the skill folder (skills/.curated/alchemy-webhooks-events in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/alchemy-webhooks-events in your project. Claude Code loads it when a task matches its description.

How do I install Alchemy Webhooks Events in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill alchemy-webhooks-events -a codex`. Or copy the skill folder (skills/.curated/alchemy-webhooks-events in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/alchemy-webhooks-events in your project. Codex loads it when a task matches its description.

Can I use Alchemy Webhooks Events in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill alchemy-webhooks-events -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/alchemy-webhooks-events, .gemini/skills/alchemy-webhooks-events, .github/skills/alchemy-webhooks-events and .opencode/skills/alchemy-webhooks-events in your project.

What does Alchemy Webhooks Events need to run?

SKILL.md names no scripts, command-line tools or credentials: Alchemy Webhooks Events is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Glob, Grep, Write, Edit. Compatibility (from SKILL.md): Designed for Claude Code; live Alchemy access requires network access, an appropriate credential, account capacity, and explicit approval.

Does Alchemy Webhooks Events access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Alchemy Webhooks Events safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Alchemy Webhooks Events use?

Alchemy Webhooks Events is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Alchemy Webhooks Events use?

About 1.3k tokens (SKILL.md is roughly 5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 787 tokens, read only when the agent opens those files.

What are the alternatives to Alchemy Webhooks Events?

Skills that share tags, products or a category with Alchemy Webhooks Events: Novu Design Workflow (novuhq/novu, 40k stars), Golive (mikehasa/golive-skill, 1.3k stars), Stripe Apps (fossasia/eventyay, 1.7k stars) and Dingtalk Message (agentscope-ai/ReMe, 3.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Alchemy Webhooks Events?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.