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Evidence for your next connection.

Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

MCP server · Data access / search

r4ck

By profullstack.com

Server/VPS/GPU offer search (r4ck.dev)

WebsiteSearch & web data
Connect to r4ck
Checks passed
11 / 22

3 failed · 8 not measured

Median response
406 ms

Median of successful probes over 7 days

30-day uptime
Not measured

Share of countable probes over 30 days, including daily rollups. Auth challenges are excluded.

Discovered tools
23

Tool definitions returned by this server

Independent monitoring

Health & checks

Status history

Responded

The server completed its last measured handshake. This is an observation, not a guarantee.

Last checked . Not enough checks yet
Check summary by test group
Test areaPassedFailedUnmeasured
ConnectionCan a client connect and discover tools?
500
Reliability & speedDoes it respond consistently and quickly?
004
Access & authenticationWhat is required to use this server?
102
Tool qualityAre the tool definitions usable by an agent?
310
Publisher identityCan the publisher be traced to its source?
222

Unmeasured means there is not enough evidence to decide. How these checks work

Inspect individual checks 22 recorded

Core

  • Pass
    Reachable

    Latest probe returned HTTP 200 in 406 ms.

  • Pass
    Valid handshake

    protocolVersion 2025-11-25, serverInfo.name r4ck.

  • Pass
    Lists tools

    tools/list returned 23 tools.

  • Pass
    Current protocol

    Negotiated 2025-11-25. The bar is 2025-06-18 or newer.

  • Pass
    HTTPS

    The endpoint URL is https.

Performance

  • Not measured
    Fast (p50)

    Median latency 406 ms over 1 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 406 ms over 1 samples in 7 days. The bar is 3000 ms. Need at least 20 samples.

  • Not measured
    Reliable (uptime)

    1 of 1 attempts returned a tool list in 30 days (100%). The bar is 99%. Need at least 30 samples.

  • Not measured
    Stable tool list

    Fewer than two successful probes in 30 days, so tool-list stability is not measured.

Access

  • Pass
    Open access

    tools/list succeeded with no credential, and the record declares none.

  • Not measured
    Standard auth

    Auth is not required, so the OAuth metadata check does not apply.

  • Not measured
    Free tier cited

    No publisher quote has been checked.

Tools

  • Pass
    Tools described

    Every tool description is at least 20 characters.

  • Pass
    Valid input schemas

    Every inputSchema is a JSON Schema object.

  • Fail
    Parameters documented

    67 of 136 parameters have a description (49%). The bar is 80%.

  • Pass
    Safety hints

    Every tool sets readOnlyHint or destructiveHint.

Publisher

  • Pass
    Verified namespace

    Listed in the Official MCP Registry.

  • Fail
    Website matches publisher

    The website host does not match the reverse-domain namespace.

  • Fail
    Source repo linked

    No repository URL is on file.

  • Not measured
    Repo owner matches

    This namespace is not an io.github login, so the owner comparison does not apply.

  • Pass
    Recently updated

    Updated 2026-11-11T13:10:59.504221Z, within 180 days.

  • Not measured
    Open-source licence

    No GitHub repository to ask about a licence.

Start using r4ck

Connect to this server

Choose your client, copy the configuration, then enable the server in your client’s MCP settings.

Run this command in your terminal, then restart Claude Code.

Claude Code

claude mcp add --transport http r4ck https://r4ck.dev/mcp

Capabilities

Tools 23

cheapest

The lowest priced rows that meet the given minimums, ranked by estimated monthly USD.

Discovered
compare_servers

Up to 20 offers side by side.

Discovered
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.

Discovered
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.

Discovered
deals

Current hosting deals and industry stories.

Discovered
delete_saved_search

Remove one saved search by id.

Discovered
delete_webhook

Delete an endpoint and its delivery log.

Discovered
facets

Every facet value with its count, under an optional filter set.

Discovered
get_provider

A provider by slug or domain, with every offer it sells here.

Discovered
get_server

One offer by id with its provider, price history and similar offers.

Discovered
list_invites

The caller’s invites (quota, status of each) and open affiliate link. Invites are scarce and single use.

Discovered
list_providers

Hosting providers with their automation (api, cli, terraform, mcp), country, categories and runtimes. Filter with has, country, category, runtime, q.

Discovered
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.

Discovered
parse_query

See how a sentence would be read, without running it.

Discovered
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.

Discovered
rotate_webhook_secret

Mint a new signing secret and return it; the old one stops working at once.

Discovered
save_search

Save a filter set under a name on the caller’s account.

Discovered
saved_searches

The caller’s saved searches, each with its URL, curl and CLI form.

Discovered
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.

Discovered
stats

Counts of servers, providers, countries, GPU offers and the last sync.

Discovered
test_webhook

Send a signed webhook.test event to the endpoint now and report the HTTP status.

Discovered
update_webhook

Change an endpoint’s url, events or description, or switch it on/off (switching on clears its failure count).

Discovered
webhook_deliveries

Recent deliveries (status, attempts, last HTTP status or error, payload), for one endpoint or all.

Discovered

Recent measurements

Probe history

View status
Latest stored probes. Raw probe rows are kept for 90 days.
CheckedResultResponseTools
Connected406 ms23

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