402Signal
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- AlicenseAqualityBmaintenanceBefore an AI agent pays an x402 endpoint, checks whether it's safe to pay: liveness, scam/anomaly scan (payTo hijack, bait-and-switch, honeypot), and on-chain receiver verification. ~70% of x402 endpoints are dead or scams.3MIT
- FlicenseNot gradedqualityBmaintenanceEnables per-request paid AI analysis of public URLs, condition verification, and AI consultation via x402 micropayments on Base, with no account or subscription.1 npm-
- FlicenseNot gradedqualityCmaintenanceProduction-grade Model Context Protocol (MCP) server delivering paywalled Web3 micro-services powered by autonomous x402 payment challenges on Base Mainnet.-
- AlicenseCqualityCmaintenancex402 Micropaid MCP Server — 120+ paid API endpoints for AI Agents. Pay per call with USDC on Base network. No signup, no API key needed.551MIT
- AlicenseNot gradedqualityCmaintenanceLets AI agents make automated USDC micro-payments on Base mainnet via x402/MPP to unlock clean structured data from URLs and other pay-per-call tools like Markdown reading, security scans, wallet enrichment, and settlement proof, with no API key or subscription.2 npm1MIT

Xenarch Agent MCPofficial
AlicenseNot gradedqualityCmaintenancePay for any x402-gated content or API with USDC micropayments on Base. Discover payment gates, execute payments, and view transaction history.1MIT
TDQS
Scored across 3 tools
Each tool maps to a distinct phase: preview discovers candidates without contacting sellers, validate performs a free single-URL readiness probe, and check runs the paid live probe with pricing/network rules and a signed receipt. Though validate and check both probe URLs, the free/paid and unsigned/signed distinctions are explicit and non-overlapping.
All three tool names are single lowercase imperative verbs—preview, validate, check—so the naming style is consistent even without a noun object. There is no snake_case/camelCase mixing or irregular pattern.
Three tools is lean but well-scoped for this focused domain: discovery, readiness validation, and paid pre-flight checking each earn their place. No tool feels redundant, and none is missing for the server's stated purpose.
The workflow is complete: agents can preview candidates for free, validate a specific listed URL for free, then check for a live signed offer before paying. The server deliberately leaves the actual payment to the agent, which is documented rather than a gap.