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  • @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
  • warp-agent-mcp by warpfreight

    warp-agent-mcpofficial

    warpfreight
    A
    license
    A
    quality
    C
    maintenance
    Quote, book, and track real LTL, FTL, cargo van, and box-truck freight through the Warp network - 20 tools, in-chat login, Stripe-charged bookings, and real carrier dispatch. Quoting is keyless; booking needs a free Warp account with a card on file.
    20
    395
    3
    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

  • viridis-agent-fleet

    jdhart81
    F
    license
    C
    quality
    B
    maintenance
    The trust-and-settlement rails of the agent economy: identity, trust, escrow, metering, arbitration, compute-carbon ledger, covenant, provenance, offsets, ERC-8004 bridge, surety, notary, and discovery — plus sellable measurement/CAD services. Durable, machine-checkable invariants, free rails.
    100
  • Countersign by countersign-network

    Countersignofficial

    countersign-network
    A
    license
    -
    quality
    C
    maintenance
    Kill switch + spend guard for AI agents that spend money: one policy, one sub-second freeze, and one signed audit ledger across every wallet vendor at once (Coinbase, Turnkey, Openfort + cards). Tools include a pre-flight request_spend guard, freeze, apply_policy, ledger, and x402/AP2 payment-mandate guards — free self-serve key, no account.
    5
    1
    MIT

  • railrouter-lite

    vdineshk
    A
    license
    -
    quality
    F
    maintenance
    RailRouter Lite is a real, production-ready MCP server implementing the Model Context Protocol. It exposes one tool: route_payment. This tool intelligently routes payments to the optimal rail (Stripe MPP, Coinbase x402, or Google AP2) in real time, choosing based on cost, latency, and success rate. Every decision is logged to a Cloudflare D1 database, creating compounding routing intelligence
    MIT

  • Header Doctor

    Baneado98
    A
    license
    -
    quality
    C
    maintenance
    A template for MCP servers that enforces a paywall gate, offering free local execution and monetizing premium features via Stripe or x402 payments.
    MIT