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  • x402-list-mcp

    mcccsm
    A
    license
    A
    quality
    B
    maintenance
    Enables AI agents to discover x402 payment services and query on-chain-verified settlement volumes per facilitator through the Model Context Protocol.
    6
    195
    MIT

  • User MCP Server

    bot-qianjinyan
    F
    license
    -
    quality
    C
    maintenance
    Streamable HTTP MCP server that exposes user and billing management tools, resources, and prompts through a REST API, enabling natural language interaction with user profiles, bills, and sharing features.

  • @powforge/captcha-mcp

    zekebuilds-lab
    A
    license
    A
    quality
    D
    maintenance
    MCP server that gates API calls to AI agents using proof-of-work (free) or Lightning payment (3 sats), providing challenge, verify, and status tools for per-call authentication without accounts.
    3
    44
    1
    MIT

  • OpenAPI Doctor

    Baneado98
    A
    license
    A
    quality
    C
    maintenance
    A template for building MCP servers with a built-in paywall gate that offers free local execution and premium server-side execution via Stripe and x402 payment lanes.
    1
    MIT

  • isocast-mcp

    jcislo
    A
    license
    A
    quality
    C
    maintenance
    MCP server providing Polymarket weather-market bucket-transition signals for AI agents, with free city/signal inspection tools and paid signal bundles via USDC on Base using x402.
    5
    15
    MIT

  • blank-invoice-maker-mcp

    InnarM
    A
    license
    A
    quality
    B
    maintenance
    Create free, no-signup invoices from your AI assistant — the create_invoice tool returns a link that opens blankinvoicemaker.com pre-filled, ready to download as a watermark-free PDF.
    2
    57
    1
    MIT

  • fabtally-mcp

    zvmzaretsky
    F
    license
    A
    quality
    B
    maintenance
    MCP server for real FDM 3D-printing slicing, quoting, and design-for-manufacturability analysis via the FabTally API, supporting 12 printer profiles and 12 materials. Includes free discovery/printability tools and paid slice/quote/orientation tools settled via x402 (USDC on Base).
    6
  • bolthub by signaltech-org

    bolthubofficial

    signaltech-org
    A
    license
    A
    quality
    A
    maintenance
    Discover and pay for APIs and MCP tools per call over Bitcoin Lightning (L402): search the bolthub marketplace, preview prices, and pay from your own wallet (LND, NWC, LNbits) with hard budgets, prepaid credit, scoped sub-agent delegation, and verifiable receipts. Non-custodial and works without a wallet for search and free tools.
    19
    MIT
  • BillingServ MCP by BillingServ

    BillingServ MCPofficial

    BillingServ
    A
    license
    A
    quality
    B
    maintenance
    This is an MCP server for the BillingServ API. Once it's set up, your AI assistant can look up customers, invoices, orders, packages, and reports straight from your BillingServ installation
    3
    182
    MIT

  • x402-gateway-mcp

    Marysbrain
    A
    license
    A
    quality
    B
    maintenance
    Enables MCP clients to access all endpoints of an x402 gateway by paying real-time microtransactions (USDC on Base) per API call, with automatic tool discovery and spend guardrails.
    23
    61
    MIT

  • invoiceninja-mcp-server

    NightSquawk
    A
    license
    A
    quality
    B
    maintenance
    Exposes all 379 Invoice Ninja v5 REST API endpoints through three consolidated tools (list, describe, call), enabling full invoice management and business operations via natural language.
    3
    13
    AGPL 3.0

  • fidacy-mcp

    lucaslubi
    A
    license
    A
    quality
    A
    maintenance
    Payment firewall for AI agents: a signed, independently verifiable verdict on every money-moving action. Blocks wrong/lookalike payee, over-cap, and duplicate-invoice (BEC) fraud before money moves — anyone can verify a verdict against the public JWKS. Free, local-first, non-custodial.
    2
    12
    1
    Apache 2.0

  • mcp-ai-fiskalizacija

    Seyn-Labs
    A
    license
    A
    quality
    C
    maintenance
    MCP server for creating and fiscalizing invoices via solo.com.hr API. Enables AI agents to generate invoices, retrieve invoice details, list invoices, and check next invoice number.
    4
    MIT