r4ck is answering right now. Last checked 6 min ago. It exposes 23 tools.
Server/VPS/GPU offer search (r4ck.dev)
Uptime history
4 hours of history · worst hour 75%
4 hours agonow
92.3%
Uptime 24h
12 of 13 checks
23
Tools
read from the server
368 ms
Response time
average over 24h
open, no key
Access
streamable-http
r4ck does not always answer
Over the last week it answered 92.3% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.
run in your terminal
claude mcp add r4ck --transport http https://r4ck.dev/mcpSettings → Connectors → Add custom connector, then paste this address
https://r4ck.dev/mcp~/.codex/config.toml
[mcp_servers.r4ck]
url = "https://r4ck.dev/mcp".cursor/mcp.json
{
"mcpServers": {
"r4ck": {
"url": "https://r4ck.dev/mcp"
}
}
}.vscode/mcp.json
{
"servers": {
"r4ck": {
"type": "http",
"url": "https://r4ck.dev/mcp"
}
}
}Available tools 23
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
webhook
create_webhook
Register an https URL to receive the caller’s events as signed POSTs (CloudEvents body, Standard Webhooks headers). Returns the endpoint and its signing secret (whsec_…), shown once.
delete_webhook
Delete an endpoint and its delivery log.
update_webhook
Change an endpoint’s url, events or description, or switch it on/off (switching on clears its failure count).
webhook_deliveries
Recent deliveries (status, attempts, last HTTP status or error, payload), for one endpoint or all.
saved
delete_saved_search
Remove one saved search by id.
saved_searches
The caller’s saved searches, each with its URL, curl and CLI form.
cheapest
cheapest
The lowest priced rows that meet the given minimums, ranked by estimated monthly USD.
compare
compare_servers
Up to 20 offers side by side.
deals
deals
Current hosting deals and industry stories.
facets
facets
Every facet value with its count, under an optional filter set.
invite
create_invite
Make one invite link from the caller’s quota. The link is returned once; both sides get days of the pass when a new account is made from it.
invites
list_invites
The caller’s invites (quota, status of each) and open affiliate link. Invites are scarce and single use.
parse
parse_query
See how a sentence would be read, without running it.
provider
get_provider
A provider by slug or domain, with every offer it sells here.
providers
list_providers
Hosting providers with their automation (api, cli, terraform, mcp), country, categories and runtimes. Filter with has, country, category, runtime, q.
redeem
redeem_code
Redeem a credit code (CR-…) on the caller’s account for days of the pass: no hourly allowance and 500 rows a page on every key, the CLI and MCP while it runs.
rotate
rotate_webhook_secret
Mint a new signing secret and return it; the old one stops working at once.
save
save_search
Save a filter set under a name on the caller’s account.
server
get_server
One offer by id with its provider, price history and similar offers.
servers
search_servers
Search every offer by spec, price and place. Returns rows, how the sentence was understood, and facet counts for narrowing. Prices carry the billed amount and an estimated USD per month.
stats
stats
Counts of servers, providers, countries, GPU offers and the last sync.
test
test_webhook
Send a signed webhook.test event to the endpoint now and report the HTTP status.
webhooks
list_webhooks
The caller’s webhook endpoints (url, event filters, on/off, failures) and the event types r4ck sends: server.listed and server.price_dropped for offers matching a saved search, pass.granted, api_key.created, api_key.revoked.
Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://r4ck.dev/mcp | streamable-http | answering | 406 ms | 6 min ago |
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r4ck — questions
Answers built from our own checks of this server.
What can r4ck do?
It exposes 23 tools, read directly from the server on our last check. Among them: cheapest, compare_servers, create_invite, create_webhook, deals, delete_saved_search and 17 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README.
How MCP servers expose tools in the first place →
What is r4ck mostly used for?
Its tools cluster around webhook and saved. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.
Is r4ck working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 12 of 13 checks got a reply (92.3%), average response time 368 ms. The bar chart above shows every period we have measured.
How do I connect r4ck?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does r4ck need an API key?
No. r4ck completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 23 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is r4ck?
It answers our handshake in 368 ms on average, which is faster than 37% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.