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/hookdeck/webhook-skills/revolut-webhooksnpx skills add hookdeck/webhook-skills --skill revolut-webhooksgit clone --depth 1 https://github.com/hookdeck/webhook-skillsWrote 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/hookdeck/webhook-skills/revolut-webhooks)<a href="https://agentmods.dev/skills/hookdeck/webhook-skills/revolut-webhooks"><img src="https://agentmods.dev/badge/skills/hookdeck/webhook-skills/revolut-webhooks.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 | $0.00055 | $0.01540 |
| Opus 5 | $0.00028 | $0.00770 |
| Sonnet 5 | $0.00011 | $0.00308 |
| Haiku 4.5 | $0.00006 | $0.00154 |
Grade A, and why
revolut-webhooks 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 yesterday.
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.
This is a copy
73% identical to adyen-webhooks — 169 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Revolut Webhooks
When to Use This Skill
- How do I receive Revolut Merchant webhooks?
- How do I verify Revolut webhook signatures (the
Revolut-Signatureheader)? - How do I handle
ORDER_COMPLETEDorORDER_PAYMENT_DECLINEDevents? - Why is my Revolut webhook signature verification failing?
- How do I set up a Revolut webhook endpoint via the Merchant API?
Verification (core)
Revolut signs each webhook with HMAC-SHA256 (hex-encoded) using your
webhook signing secret (wsk_…, returned when you create the webhook via
the Merchant API). There is no official SDK webhook helper, so verify manually.
The signed payload is v1.{Revolut-Request-Timestamp}.{raw body} —
period-separated, using the raw request body (re-serialized JSON breaks the
signature). The Revolut-Signature header holds v1=<hex> and may carry
multiple comma-separated signatures during secret rotation — accept if any
matches.
const crypto = require('crypto');
function verifyRevolutSignature(rawBody, timestamp, signatureHeader, secret) {
if (!timestamp || !signatureHeader) return false;
// Reject stale timestamps (± 5 min). Header is a UNIX timestamp in ms.
const ts = Number(timestamp);
const tsMs = timestamp.length <= 10 ? ts * 1000 : ts; // tolerate seconds or ms
if (!Number.isFinite(ts) || Math.abs(Date.now() - tsMs) > 5 * 60 * 1000) return false;
const expected = 'v1=' + crypto
.createHmac('sha256', secret)
.update(`v1.${timestamp}.${rawBody}`)
.digest('hex');
// Header may hold multiple signatures during rotation — accept any match.
return signatureHeader.split(',').some((sig) => {
const a = Buffer.from(sig.trim());
const b = Buffer.from(expected);
return a.length === b.length && crypto.timingSafeEqual(a, b);
});
}
For complete handlers with route wiring, event dispatch, and tests, see:
What ships with it
19 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.
- examples/express/.env.example 241 B
- examples/express/package.json 394 B
- examples/express/README.md 1.6 KB
- examples/express/src/index.js 3.9 KB runs code
- examples/express/test/webhook.test.js 5.1 KB runs code
- examples/fastapi/.env.example 172 B
- examples/fastapi/main.py 3.5 KB runs code
- examples/fastapi/README.md 1.9 KB
- examples/fastapi/requirements.txt 82 B
- examples/fastapi/test_webhook.py 5.4 KB runs code
- examples/nextjs/.env.example 172 B
- examples/nextjs/app/webhooks/revolut/route.ts 3.5 KB runs code
- examples/nextjs/package.json 507 B
- examples/nextjs/README.md 1.8 KB
- examples/nextjs/test/webhook.test.ts 4.3 KB runs code
- examples/nextjs/vitest.config.ts 140 B runs code
- references/overview.md 3.2 KB
- references/setup.md 3.0 KB
- references/verification.md 4.7 KB
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.
- yesterday First seen · 136 lines · 55 tokens per session scan A f5320ed3f94a
revolut-webhooks is a skill published in the GitHub repository hookdeck/webhook-skills (84 stars, last pushed yesterday), licensed MIT. It adds 55 tokens to every session and 1,540 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 73% identical to adyen-webhooks, differing in 169 lines, and is treated as a copy.
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