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"Connecting external data sources for contextual LLM calls" matching MCP servers:

  • RE Data Refinery MCP Server

    areshms
    A
    license
    Not graded
    quality
    C
    maintenance
    Turns messy real estate data into clean, scored, AI-ready property intelligence for Columbus, OH metro, with pay-per-query via x402 micropayments. Enables natural-language search, investment scoring, and enrichment tools for MCP clients.
    MIT

  • Cerberus

    lz-123123
    A
    license
    Not graded
    quality
    B
    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
    2
    MIT

  • @powforge/captcha-mcp

    zekebuilds-lab
    A
    license
    A
    quality
    B
    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
    64
    1
    MIT

  • mcp-proofjson

    proofjson
    A
    license
    A
    quality
    A
    maintenance
    A local MCP server that integrates ProofJSON to assess invoices before payment, providing allow/review/block decisions with confidence scores and verification capabilities.
    3
    MIT

  • nwc-mcp

    llmops-pro
    A
    license
    A
    quality
    B
    maintenance
    MCP server exposing a Lightning wallet to LLM agents over Nostr Wallet Connect (NIP-47): balance, invoices, LN address/LNURL payments, batch pay, and keysend. All spend tools are wrapped in a defense-in-depth safety stack — budget caps, allowlist, two-step confirmation, audit log.
    13
    45
    MIT

  • Aza MCP

    Abdulkereem
    A
    license
    A
    quality
    C
    maintenance
    Enables AI assistants to buy airtime and data, check wallet balance, list data plans, and view transactions for Nigerian mobile networks via an Azabill account.
    6
    14
    MIT

  • payments-toolkit-mcp

    ramigs
    F
    license
    A
    quality
    B
    maintenance
    A local MCP server providing payment validation tools and resources, including card number Luhn checks, card network detection, and IBAN validation, with no network calls required.
    3

  • freee-mcp-solo

    kogasura
    A
    license
    A
    quality
    B
    maintenance
    Enables individual proprietors and freelancers to manage daily accounting tasks like journal entries, invoice creation, and monthly reconciliation through simple tool calls, using freee's API.
    7
    13
    MIT

  • revenuecat-mcp

    jeevestheagent
    F
    license
    A
    quality
    D
    maintenance
    MCP server for RevenueCat that lets AI agents query subscriber data, check entitlements, fetch offerings, and manage subscriptions via natural language.
    6

  • paymongo-mcp

    theYahia
    A
    license
    A
    quality
    B
    maintenance
    MCP server for PayMongo payment gateway (Philippines). Supports payment intents, sources, payments, refunds, and checkout sessions via Basic Auth.
    24
    20
    1
    MIT

  • elorus-mcp

    nikan
    A
    license
    A
    quality
    B
    maintenance
    MCP server for the Elorus invoicing and accounting platform, enabling AI assistants to create invoices, manage contacts, and query financial data through natural language.
    43
    2
    MIT

  • pix-mcp

    Regenerating-World
    A
    license
    A
    quality
    D
    maintenance
    Enables AI agents to generate static Pix QR codes for Brazilian payments using natural language, with EMV 4.0 compliance and no external API required.
    2
    22
    3
    MIT

  • paywall-mcp

    llmops-pro
    A
    license
    B
    quality
    B
    maintenance
    Generic Lightning-paywall sidecar that wraps any stdio MCP server and requires a paid Lightning invoice (via NWC) before forwarding priced tool calls. Per-tool prices are set via env; includes payment verification, replay protection, and an audit log — the upstream server stays untouched.
    13
    39
    MIT