Spec Driven Development
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Description from the maker (original English)
Paid cron for AI agents: we call your https URL on schedule, signed. No account, paid with x402.
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Works in Claude on the web, desktop and mobile:
https://402cron.com/mcpRun this in your terminal
claude mcp add --transport http 402cron https://402cron.com/mcpPaste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"402cron": {
"url": "https://402cron.com/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Paste into .vscode/mcp.json in your project
{
"servers": {
"402cron": {
"type": "http",
"url": "https://402cron.com/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
https://402cron.com/mcpMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
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We have not read this server’s tool list yet; we check endpoints in rotation.
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026
The registry name was verified against the domain 402cron.com (the registry checks domain ownership)
We have not read this repo from GitHub yet
We have not read this repo from GitHub yet
Not checked yet; we check endpoints in rotation
Not checked yet; we check endpoints in rotation
Not checked yet; we read the tool list when we check the endpoint
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
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It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
The GitHub repo last changed –, and the latest version (1.0.1) reached the registry 2 months ago.
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
In the same category: Spec Driven Development, Remote Desktop Commander, FOGA node
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
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402cron calls your https endpoint on a cron schedule, signs every request, and retries what fails. An agent can set it up on its own: no account, no card, no human in the loop. Payment is x402 — USDC on Base — and the only identity is the wallet that paid.
This repository holds documentation and runnable examples. The service runs at
https://402cron.com; its source code is not published.
?section=quickstart)com.402cron/402cron| Pack | Price | Deliveries | Per delivery |
|---|---|---|---|
trial | $0.02 | 20 | $0.001 |
starter | $1 | 2,000 | $0.0005 |
month | $25 | 50,000 | $0.0005 |
The balance counts deliveries, not money, and never expires. Each delivery attempt uses one credit, so a failing delivery costs at most three. Current prices: https://402cron.com/api/pricing.
GET https://402cron.com/buy/trial answers 402 with the price in the PAYMENT-REQUIRED header. Pay with any x402 client. The receipt carries your management token, shown once.POST /api/destinations with {"url": "https://your.host/hook"} returns the destination id and its signing secret, shown once.POST /api/destinations/{id}/verify. We POST a challenge to your URL and your endpoint echoes it back. The permission then covers that path and everything below it.POST /api/tasks with {"name", "url", "cron", "body"}. The response shows the next three runs.Management calls take Authorization: Bearer . Lost the token? Buy again from the same wallet with ?rotate=1; the old token stops working.
Three kinds of requests arrive at the same URL. X-402cron-Event tells them apart:
X-402cron-Event | When | Signed | Your endpoint should |
|---|---|---|---|
verify | once, when you call /verify | no | answer with the X-402cron-Challenge value as the body, within 5 s |
delivery | on schedule, on retries, and when you call /run | yes | check the signature and answer 2xx within 2 s |
task_paused | once, when a task pauses | yes | read reasonCode, fix the cause, POST the resume URL |
The signature is X-402cron-Signature: sha256= , an HMAC-SHA256 keyed with your signing secret over the bytes of:
{X-402cron-Timestamp}\n{X-402cron-Delivery-Id}\n{X-402cron-Attempt}\n{METHOD}\n{path+query}\n{raw body}
The event label is not signed: branch on it, but trust what the signature covers. Delivery is at least once — the same X-402cron-Delivery-Id can arrive twice, so treat a repeat as already handled. Deliveries also carry X-402cron-Task-Id and X-402cron-Deliveries-Left.
4xx or 5xx is your server's answer, so it is not retried.task_paused notice; resuming is one call.cron: 5 fields, always UTC, one minute at the finest. Names (MON-FRI, JAN) and macros (@daily, @hourly, …) work; anything unsupported is refused with a code that says why.https://.All limits: https://402cron.com/docs?section=limits
| Folder | What it is | Run |
|---|---|---|
receiver/node | a destination endpoint, no dependencies | SECRET_402CRON=… node server.mjs |
receiver/python | the same, standard library only | SECRET_402CRON=… python server.py |
client | buy a trial with x402, register, verify, schedule | npm install, then DRY_RUN=1 node buy-and-schedule.mjs |
Both receivers answer the challenge, verify signatures, drop duplicate deliveries and log pause notices. The client reads the price from the PAYMENT-REQUIRED header like any standard x402 client, caps what it may spend (MAX_USD, default $0.05), and with DRY_RUN=1 signs without paying anything. On Windows PowerShell, set variables with $env:SECRET_402CRON="…" first.
Claude Code:
claude mcp add --transport http 402cron https://402cron.com/mcp --header "Authorization: Bearer <token>"
Other clients: add a remote (streamable HTTP) server at https://402cron.com/mcp with the same header. get_pricing, get_docs and get_service_status work without a token. There is no purchase tool on purpose: pay over plain HTTP, because a signed payment should not travel through a model's context.
We guarantee that we tried to deliver your task — not what someone else's server does with it. Full terms: https://402cron.com/terms
The examples in this repository are MIT-licensed — see LICENSE.