paidfor

io.github.sarmadahsan/paidforsarmadahsanstreamable-httpv0.3.0Scanned 2 hours ago

Check an x402 seller before paying: verdict, failure rate and evidence from paid calls on Base.

3 tools: 3 change things.

Reads private data · 0
Reads text others write · 3
Can send data out · 1
3 findings

Anlyon alternative

3 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

3 tools

Changes things 3Creates or changes something that can be changed back.Claude Code: ask

check_x402_sellerCall this before paying any x402 seller, before retrying a request that returned 402, or when the user names an API they intend to pay per call.Reads text others writeCan send data out1 finding
Why it is in this group
- The description's first verb is "call": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
- outboundThe input takes a URL (input.url): a request to a URL can carry data to whoever runs it.
Findings
- Warn
  The server marks "check_x402_seller" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "call": a word for a change.
  What this check looks for
Description, as the server wrote it
Call this before paying any x402 seller, before retrying a request that returned 402, or when the user names an API they intend to pay per call. Returns a verdict (avoid, caution, ok, unknown), one sentence to act on, the seller's paid-call count and failure rate with a 95% interval, listed price, modal quote and max overcharge ratio when known, and links to the seller page and raw evidence.
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
list_reliable_sellersCall this when choosing which x402 seller to use for a task, or when the user asks for a safe or reliable API.Reads text others write1 finding
Why it is in this group
- The name "list_reliable_sellers" says "list": a word for reading.
- The description's first verb is "call": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Findings
- Warn
  The server marks "list_reliable_sellers" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "list_reliable_sellers" says "list": a word for reading.
  What this check looks for
Description, as the server wrote it
Call this when choosing which x402 seller to use for a task, or when the user asks for a safe or reliable API. Returns sellers with zero failures across at least 30 paid calls, most-called first; optional category filter (inference, data, scraping, compute, other).
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
recent_changesCall this when the user asks what changed for an x402 seller or in the index, or before relying on a verdict older than a day.Reads text others write1 finding
Why it is in this group
- The description's first verb is "call": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Findings
- Warn
  The server marks "recent_changes" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "call": a word for a change.
  What this check looks for
Description, as the server wrote it
Call this when the user asks what changed for an x402 seller or in the index, or before relying on a verdict older than a day. Returns recent changes, newest first: verdict changes, new failures by type, moved quotes, changed pay-to addresses, sellers added or reaching 30 paid calls, published seller replies, the operator-reported series maturing or disagreeing with ours; optional host filter and since (ISO time).
Annotations the server declares
- readOnlyHint: true
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write3: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; check_x402_seller
list_reliable_sellers
recent_changes
Can send data out1: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.; check_x402_seller

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

3 warn

Warncheck_x402_seller
The server marks "check_x402_seller" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "call": a word for a change.
What this check looks for
Warnlist_reliable_sellers
The server marks "list_reliable_sellers" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "list_reliable_sellers" says "list": a word for reading.
What this check looks for
Warnrecent_changes
The server marks "recent_changes" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "call": a word for a change.
What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 0.3.0. Values in angle brackets are yours to fill in.

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

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

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__paidfor__check_x402_seller",
      "mcp__paidfor__list_reliable_sellers",
      "mcp__paidfor__recent_changes"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as paidfor. Review it before you use it.

Capability tags behind 3 rules

mcp__paidfor__check_x402_seller untrusted-input, outbound
mcp__paidfor__list_reliable_sellers untrusted-input
mcp__paidfor__recent_changes untrusted-input

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/io.github.sarmadahsan/paidfor/verify?hash=934ebf4af3f413513fc7335a2cb9531616a5196377ac7817f4abda39cad714cc" | jq -e '.changed == false'

Pinned hash 934ebf4af3f4, from Oct 29, 2026, 03:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.sarmadahsan/paidfor/changes.xml

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Source: MCP Registry. Synced Oct 29, 2026, 03:18 UTC.