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PayAI x402 Facilitator

by payai.network · remote · no sign-in to list tools · v2.0.1 · published by network.payai

Verify and settle x402 stablecoin payments; browse the PayAI Bazaar of x402-payable resources.

Final · 2
CompareRegistry entry

5 tools: 2 do something that can't be undone and 3 only read.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http facilitator https://facilitator.payai.network/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

5 tools

Can't be undone 2Claude Code: ask
  • settle_paymentBroadcasts the payment on-chain and moves real funds; it is idempotent per signed payload, so resubmitting the identical payload returns the recorded outcome.No findings

    Why it is in this group

    • The name "settle_payment" says "payment": a word that usually means money moves, which cannot be taken back.
    Description, as the server wrote it
    Broadcasts the payment on-chain and moves real funds; it is idempotent per signed payload, so resubmitting the identical payload returns the recorded outcome. Treat errorReason "settlement_pending" as unresolved and call again with the identical arguments to poll.
  • verify_paymentVerifies a signed x402 payment payload against the supplied payment requirements.No findings

    Why it is in this group

    • The name "verify_payment" says "payment": a word that usually means money moves, which cannot be taken back.
    Description, as the server wrote it
    Verifies a signed x402 payment payload against the supplied payment requirements. It checks validity but moves no funds.
Only reads 3Claude Code: allow
  • get_discovery_statsReturns aggregate statistics for the PayAI Bazaar catalog and its settlement activity.No findings

    Why it is in this group

    • The name "get_discovery_stats" says "get": a word for reading.
    Description, as the server wrote it
    Returns aggregate statistics for the PayAI Bazaar catalog and its settlement activity. Use it for a compact view of catalog size and payment volume rather than individual resources.
  • get_supportedReturns the payment networks, schemes, assets, and facilitator addresses currently supported by PayAI.No findings

    Why it is in this group

    • The name "get_supported" says "get": a word for reading.
    Description, as the server wrote it
    Returns the payment networks, schemes, assets, and facilitator addresses currently supported by PayAI. Use it before constructing payment requirements when you need live capability data.
  • list_discovery_resourcesLists x402-payable resources published in the PayAI Bazaar catalog.No findings

    Why it is in this group

    • The name "list_discovery_resources" says "list": a word for reading.
    Description, as the server wrote it
    Lists x402-payable resources published in the PayAI Bazaar catalog. Use limit and offset to page through APIs, MCP tools, and agent services available for discovery.

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 untrusted-input or outbound.

Reads private data0
Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write0
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.

Looked at Oct 22, 2026, 15:11 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
2
Protocol version
2025-06-18
WWW-Authenticate on 401
not observed
resource_metadata in WWW-Authenticate
none
RFC 9728 protected resource metadata
none
Authorization servers
none
Legacy HTTP+SSE transport
no
Dynamic client registration
not observed
Client ID metadata documents
not observed
  • HighThe whole server

    The endpoint served tools/list without credentials, and the list has 2 tools that change things (2 irreversible). Whether a call also works without credentials was not tested: tools are never called.

    Matched text

    https://facilitator.payai.network/mcp: tools/list returned 5 tools to an anonymous client, including verify_payment (irreversible), settle_payment (irreversible)

    What this check looks for

Install

Pinned to version 2.0.1. Values in angle brackets are yours to fill in.

claude mcp add --transport http facilitator https://facilitator.payai.network/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__facilitator__get_supported",
      "mcp__facilitator__list_discovery_resources",
      "mcp__facilitator__get_discovery_stats"
    ],
    "ask": [
      "mcp__facilitator__verify_payment",
      "mcp__facilitator__settle_payment"
    ],
    "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 facilitator. Review it before you use it.