x402 Pay — USDC API Payment Helper

by scriptmasterlabs.com · remote · no sign-in to list tools · v1.0.0 · published by com.scriptmasterlabs

Pay for APIs with USDC. Read-only x402 payment discovery, verification, evidence, and status.

Final · 2

Compare Registry entry

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

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone2Claude Code: ask: see these tools
Changes things0Claude Code: ask
Only reads3Claude Code: allow: see these tools

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

claude mcp add --transport http x402-pay https://squeezeos-api.onrender.com/mcp/x402-pay

Findings

Matches of fixed checks, with the text they matched.

3 warn2 info

Warnpayment_info
The description contains "override these hints; this tool", wording about other tools or servers.
Matched text
description: "...nly policy. Fresh resource requirements override these hints; this tool does not sign, spend or prove settlemen..."
What this check looks for
Warnpayment_info
The server marks "payment_info" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "payment_info" says "payment": a word that usually means money moves, which cannot be taken back.
What this check looks for
Warncheck_payment
The server marks "check_payment" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "check_payment" says "payment": a word that usually means money moves, which cannot be taken back.
What this check looks for
Infocheck_payment
The input schema at properties.url.description mentions "credentials".
Matched text
inputSchema.properties.url.description: "...ned GET. No payment headers; redirects, credentials and private network targets are rejecte..."
What this check looks for
Infox402_inspect_challenge
The input schema at properties.url.description mentions "credentials".
Matched text
inputSchema.properties.url.description: "...ned GET. No payment headers; redirects, credentials and private network targets are rejecte..."
What this check looks for

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 2Sends, pays, publishes or merges: once done, it cannot be taken back.Claude Code: ask

check_paymentInspect a public HTTPS URL for a fresh x402 v2 HTTP 402 challenge using an unsigned GET with a 10-second network timeout and no redirect following.2 findings
Why it is in this group
- The name "check_payment" says "payment": a word that usually means money moves, which cannot be taken back.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Info
  The input schema at properties.url.description mentions "credentials".
  Matched text
  inputSchema.properties.url.description: "...ned GET. No payment headers; redirects, credentials and private network targets are rejecte..."
  What this check looks for
- Warn
  The server marks "check_payment" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "check_payment" says "payment": a word that usually means money moves, which cannot be taken back.
  What this check looks for
Description, as the server wrote it
Inspect a public HTTPS URL for a fresh x402 v2 HTTP 402 challenge using an unsigned GET with a 10-second network timeout and no redirect following. Returns validated payTo, asset, network, atomic amount, resource and maxTimeoutSeconds; incomplete or non-x402 responses return challenge=null and a reason. Does not sign, settle or verify receipts. Fresh requirements override documented receiver hints; inspect canonical_receiver_match before choosing to pay.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: true
payment_infoRead the documented SML x402 v2 Base/USDC configuration and receiver before selecting a paid route.2 findings
Why it is in this group
- The name "payment_info" says "payment": a word that usually means money moves, which cannot be taken back.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The description contains "override these hints; this tool", wording about other tools or servers.
  Matched text
  description: "...nly policy. Fresh resource requirements override these hints; this tool does not sign, spend or prove settlemen..."
  What this check looks for
- Warn
  The server marks "payment_info" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "payment_info" says "payment": a word that usually means money moves, which cannot be taken back.
  What this check looks for
Description, as the server wrote it
Read the documented SML x402 v2 Base/USDC configuration and receiver before selecting a paid route. Returns configuration and a read-only policy. Fresh resource requirements override these hints; this tool does not sign, spend or prove settlement.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: true

Only reads 3Looks things up and changes nothing.Claude Code: allow

check_statusRead the current SqueezeOS backend status and payment-readiness evidence.No findings
Why it is in this group
- The name "check_status" says "status": a word for reading.
Description, as the server wrote it
Read the current SqueezeOS backend status and payment-readiness evidence. Returns both upstream envelopes and autonomous_spend=false. Use to diagnose readiness before purchase; HTTP availability or readiness flags alone do not establish settled or accepted delivery.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: true
list_paid_apisList paid API operations declared by the live SqueezeOS OpenAPI document, bounded by limit.No findings
Why it is in this group
- The name "list_paid_apis" says "list": a word for reading.
Description, as the server wrote it
List paid API operations declared by the live SqueezeOS OpenAPI document, bounded by limit. Returns method, path, job and advertised price. Use for route selection, then inspect that resource's fresh 402 challenge; listed prices do not authorize payment.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: true
x402_inspect_challengeInspect a fresh x402 v2 challenge without sending payment.1 finding
Why it is in this group
- The name "x402_inspect_challenge" says "inspect": a word for reading.
Findings
- Info
  The input schema at properties.url.description mentions "credentials".
  Matched text
  inputSchema.properties.url.description: "...ned GET. No payment headers; redirects, credentials and private network targets are rejecte..."
  What this check looks for
Description, as the server wrote it
Inspect a fresh x402 v2 challenge without sending payment. Compatible alias of check_payment with the same schema, 10-second unsigned probe and result. Use before a paid resource call; do not use as a signer, receipt verifier or settlement proof. Non-402 and incomplete challenges remain null rather than receiving invented defaults.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: 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.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http x402-pay https://squeezeos-api.onrender.com/mcp/x402-pay

Run in a terminal.

Claude Code permissions

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

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__x402-pay__list_paid_apis",
      "mcp__x402-pay__x402_inspect_challenge",
      "mcp__x402-pay__check_status"
    ],
    "ask": [
      "mcp__x402-pay__payment_info",
      "mcp__x402-pay__check_payment"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as x402-pay. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/com.scriptmasterlabs/x402-pay/changes.xml

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Anlyon alternative

2 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.

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Source: MCP Registry · repository. Synced Oct 21, 2026, 18:04 UTC.

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