Mmcp.market

PayGuard MCP server

by mercadosclaro-eng·io.github.mercadosclaro-eng/payguard·v0.1.0
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Pre-payment checks for AI agents: x402 quotes, untrusted prompts and audit receipts.

C57/100grade C
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Safety scan
C57/100

full report

Adoption
New

Little public usage data yet

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If you have run it, two minutes of your experience saves the next person an afternoon.

PayGuard tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Public scan report

scanner v0.1.9 · 2026-09-23 · same rubric, same numbers if you re-run it

1 low
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 90ms (auth required)20/20
  • –Tool poisoningtools not inspected (endpoint requires auth); not countedn/a
  • Auth qualityauth enforced (unknown)9/15
  • Maintenanceno repository listed3/15
  • Maintainer identityno repository or website to verify2/10

Findings (1)

  • lowNo source repository listedmaint.no-repo
Overall 57/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

Install directly

claude mcp add --transport http payguard https://payguard-production-abfe.up.railway.app/mcp
Add to Cursor

PayGuard: common questions

Is PayGuard MCP server safe?
With care: it is graded C, so read the findings first (57/100). Read the PayGuard safety report
How do I install PayGuard?
It runs remotely at payguard-production-abfe.up.railway.app. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
Does PayGuard need an API key?
Yes. The registry entry asks for Authorization.
Is PayGuard maintained?
The latest release is v0.1.0.
Is PayGuard up?
100% of our last 3 checks got an answer. We check remote servers about four times a day.
What can I use instead of PayGuard?
Servers from other publishers that do the same job: Pulsefeed X402 MCP server, POPCORN MCP server and three.ws Agent Payments MCP server. Compare all PayGuard alternatives.

Alternatives to PayGuard

Same job from other publishers: the closest match first, then the best rated.

All PayGuard alternatives →
  • Pulsefeed X402
    Verify x402 payment endpoints before an AI agent pays: scam scan, on-chain checks, trust scores.
    A
  • POPCORN MCP
    Signed time and SHA-256 witness receipts for agents, with offline verification and x402 payment.
    B
  • three.ws Agent Payments
    Governed x402 payment sessions: pay any endpoint with budget, allowlist & per-tx caps, no key.
    B
  • X402 List
    Find and vet x402 payment APIs before your agent pays one: uptime, price, on-chain volume.
    A
  • PipRail
    Budget-bound x402 payment wallet for AI agents — pays HTTP 402 URLs, capped locally. No backend.
    B
PayGuard vs Pulsefeed X402PayGuard vs POPCORN MCPPayGuard vs three.ws Agent Payments

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