x402-agent-mcp
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AlicenseNot gradedqualityCmaintenanceAn MCP server that enables AI agents to search, pay for, and call paid APIs using the x402 protocol, with automatic USDC settlement.2MIT
mpp32-mcp-serverofficial
AlicenseNot gradedqualityCmaintenanceMCP server that allows AI agents to discover and pay for thousands of APIs (x402 on Solana/Base) using a single key, with automatic payment handling and a federated catalog of machine-payable endpoints.234MIT- FlicenseAqualityBmaintenanceMCP server for a live x402 payment gateway on Base (USDC). Lets AI agents discover, preview for free, then pay per call — with prepaid gasless payments, signed receipts, and delta delivery.7-
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TDQS
Scored across 8 tools
Each tool has a clearly defined role covering category listing, searching, describing, discovering, health-checking, and fetching. The main overlap is between discover_url and discover_urls, which are the same operation in single and batch form, but this is a reasonable convenience rather than a true ambiguity.
All tools share the x402_ prefix and most use a verb or verb_noun pattern (list_categories, search, describe, discover_url, crawl_directory, fetch). The exceptions are health, which is a noun, and two discover verbs with slightly different forms, but the overall convention remains predictable.
Eight tools is well within the ideal range for this domain. Each tool addresses a distinct stage of discovering, evaluating, and consuming x402 services without excessive redundancy or missing core functions.
The toolset covers the full lifecycle from discovery (search, crawl, list categories), to verification (health, describe, discover_url), to interaction (fetch with automatic payment handling). No obvious dead ends or missing capabilities are apparent for an agent needing to work with x402 endpoints.