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PayAPI Market

market.payapi/marketplacepayapi.marketstreamable-httpv1.0.1Scanned

Search settlement-verified x402 APIs. Discovery is free. Agents pay the provider in USDC on Base.

4 tools: 1 change things and 3 only read.

Tools: 0 delete, 0 irreversible, 1 write, 3 read.
  • Reads private data · 0
  • Reads text others write · 3
  • Can send data out · 0
  • No findings

Tools listed without sign-in. Remote posture

Anlyon alternative

1 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 →
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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.

4 tools

Changes things 1Claude Code: ask
  • submit_listingSubmit a new API listing to PayAPI Market.No findings

    Why it is in this group

    • The name "submit_listing" says "submit": a word for a change.
    Description, as the server wrote it
    Submit a new API listing to PayAPI Market. The listing will be validated, preflighted, and placed in pending review. NEVER sets payment_verified or makes the listing live - PayAPI Market will test it with a real paid call (up to $0.10 USDC on Base). If the test succeeds, the listing receives a settlement-verified badge and appears in the marketplace. Rate limited: max 10 submissions per hour, 50 per day per IP and per payTo address.

    Annotations the server declares

    • title: Submit a listing to PayAPI Market
    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: false
Only reads 3Show 3 read-only tools
  • get_apiFetch a single live listing by its id or slug, including base_url, price range, network and verification state.Reads text others writeNo findings

    Why it is in this group

    • The name "get_api" says "get": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • untrusted-inputThe description's first sentence says "fetch" and "url": it reads web pages, which anyone can write.
    Description, as the server wrote it
    Fetch a single live listing by its id or slug, including base_url, price range, network and verification state. payment_verified is true if at least one route was paid; verified_routes names each paid route with its on-chain receipt. Also returns a reliability object: score (0 to 100 or null), band (strong, established, thin, caution or unscored) and computed_at. Reliability is a running score from paid verifications, health history and payTo integrity, not a star rating and not a guarantee; unscored means it has not been computed for that listing yet. Method: https://payapi.market/how-an-agent-finds-payapi. Returns the listing whether or not it is verified, and reports payment_verified honestly. Free and read-only; spends nothing.

    Annotations the server declares

    • title: Get one PayAPI Market listing
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • list_apisBrowse the live catalogue, optionally filtered to one category.Reads text others writeNo findings

    Why it is in this group

    • The name "list_apis" says "list": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    • untrusted-inputThe description's first sentence says "browse": it reads web pages, which anyone can write.
    Description, as the server wrote it
    Browse the live catalogue, optionally filtered to one category. Omit category for everything. Returns settlement-verified listings only unless verified_only is false. Free and read-only; spends nothing.

    Annotations the server declares

    • title: List the PayAPI Market catalogue
    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: true
  • search_apisFree-text search across the live catalogue.Reads text others writeNo findings

    Why it is in this group

    • The name "search_apis" says "search": a word for reading.

    What it can reach

    • untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
    Description, as the server wrote it
    Free-text search across the live catalogue. Matches listing name, description, category and provider name. Returns settlement-verified listings only unless verified_only is false. Free and read-only; spends nothing.

    Annotations the server declares

    • title: Search the PayAPI Market catalogue
    • 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 or outbound.

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.
Can send data out0
Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

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

Remote posture

What anyone on the internet sees at the remote endpoint: an anonymous initialize and tools/list, and the public OAuth metadata.

Tools listed without sign-in

Looked at Oct 22, 2026, 15:10 UTC, unchanged since Oct 22, 2026. No credentials were sent and no tool was called. What is looked at.

Reachable
yes
HTTP status of an anonymous initialize
200
tools/list served without credentials
yes
Tools that change things, listed without credentials
1
Protocol version
2025-06-18
WWW-Authenticate on 401
not observed
resource_metadata in WWW-Authenticate
not observed
RFC 9728 protected resource metadata
not observed
Authorization servers
not observed
Legacy HTTP+SSE transport
no
Dynamic client registration
not observed
Client ID metadata documents
not observed
  • WarnThe whole server

    The endpoint served tools/list without credentials, and the list has 1 tool that changes things (1 write). Whether a call also works without credentials was not tested: tools are never called.

    Matched text

    https://payapi.market/mcp: tools/list returned 4 tools to an anonymous client, including submit_listing (write)

    What this check looks for

Findings

Matches of fixed checks, with the text they matched.

No check matched anything in these tool definitions. That is not a safety guarantee.

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 1.0.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http marketplace https://payapi.market/mcp
claude mcp add --transport http marketplace https://payapi.market/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": [
      "mcp__marketplace__search_apis",
      "mcp__marketplace__list_apis",
      "mcp__marketplace__get_api"
    ],
    "ask": [
      "mcp__marketplace__submit_listing"
    ],
    "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 marketplace. Review it before you use it.

Capability tags behind 3 rules
  • mcp__marketplace__search_apis untrusted-input
  • mcp__marketplace__list_apis untrusted-input
  • mcp__marketplace__get_api untrusted-input

Pin

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/market.payapi/marketplace/verify?hash=d7396061d7d76644deca29c7b89dd8cd784de44857d5164ac7667fadb65fcf5e" | jq -e '.changed == false'

Pinned hash d7396061d7d7, from Oct 21, 2026, 19:18 UTC.

Watch

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

https://anlyon.dev/servers/market.payapi/marketplace/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Badge

anlyon.dev badge for market.payapi/marketplace
[![anlyon.dev](https://anlyon.dev/badge/market.payapi/marketplace.svg)](https://anlyon.dev/servers/market.payapi/marketplace)

Source: MCP Registry. Synced Oct 21, 2026, 18:53 UTC.