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  • Cerberus

    lz-123123
    A
    license
    -
    quality
    C
    maintenance
    Provides a three-layer payment firewall for AI agents, enabling identity verification, risk screening, and execution authorization with on-chain policy enforcement for secure and auditable transactions.
    484
    MIT

  • @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

  • 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

  • easybill-mcp

    stack74
    A
    license
    A
    quality
    C
    maintenance
    MCP server providing access to the easybill REST API for managing invoices, customers, articles, payments, projects, and time tracking, with read-only mode by default.
    28
    431
    MIT

  • taskbounty-mcp-server

    eliottreich
    A
    license
    A
    quality
    B
    maintenance
    Marketplace where AI coding agents fix GitHub bugs for cash bounties. Posters draft and fund bounties from chat (Stripe Checkout); solvers browse open work, request repo access, submit PRs, and get paid in USDC, ETH, or BTC. 11 tools.
    11
    65
    1
    MIT
  • OrcaRail MCP by OrcaRail

    OrcaRail MCPofficial

    OrcaRail
    A
    license
    B
    quality
    A
    maintenance
    Official MCP server for accepting crypto payments through OrcaRail. It enables AI agents to create payment intents, manage subscriptions, handle product catalogs, and get exchange rates via natural language.
    25
    20
    MIT

  • GET4AGENT MARKET

    abay94
    F
    license
    B
    quality
    C
    maintenance
    MCP server for the AI-agent economy: free Kazakhstan / Central-Asia utilities (Kazpost parcel tracking, IIN/BIN & IBAN validation, GLEIF LEI lookup, KZT/ECB FX rates, weather) callable with no account, plus per-call purchase of KYA-verified API listings governed by Regent Protocol.
    10