"Building and Using MCP Tools" matching MCP servers:

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.

Enables MCP clients to access Monobank's open API for exchange rates, account and jar balances, and statements, as well as set webhooks, using natural language tools.

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.

MCP server for cryptocurrency payment integration, enabling payment requests, webhook verification, and payment URL building.

Lets AI assistants shop at UCP-enabled merchants through tools for discovery, checkout, discounts, fulfillment, and payment.

Authentication, pay-per-call metering, and signed receipts for AI agents and MCP tools using Bitcoin and Lightning Network.

Enables building client statements of account from existing invoices, credit notes, and deposits, with aged outstanding balances, PDF/plain-text output, and drafted payment chasers at friendly, firm, or final levels.

An MCP server for Grubhub that enables searching restaurants, browsing menus, building carts, checking out, and placing orders, with additional support for campus dining cards.

Enables AI agents to discover and call MoiPayWay API endpoints using a merchant API key, with tools for wallets, transfers, collections, cards, users, verification, and webhook signature validation.

MCP server for integrating HiPay's Enterprise payment API, providing tools for transaction management, payment processing, and hosted payment pages.

Base library for building MCP e-invoicing servers: abstract base classes, shared Pydantic models, XML utilities, and OAuth2-capable async HTTP client.

Enables users to connect bank accounts within a chat session using Sophtron's UCW widget and query account information, owner details, and transactions persistently.

Enables AI agents to discover, pay for, and sell APIs using crypto on Solana and Base networks, with support for automated x402 payments.

Enables AI assistants to read Itaú bank account information (balances, statements, credit card bills, investments) via Open Finance Brasil, read-only.

Enables AI agents to issue, query, and cancel Serbia SEF eFaktura electronic invoices (UBL 2.1 SRB-CIUS) into the national Ministry of Finance system, using the merchant's own API key.

An MCP server that exposes tools for Taiwan's ezPay e-invoice lifecycle, enabling AI assistants to issue, void, and query invoices and allowances through the standard MCP protocol.

MCP server for T-Kassa (T-Bank/Tinkoff) payment API. Provides 16 tools for payments, refunds, recurring charges, customer management, saved cards, SBP, receipts, and T-Invest portfolio.

Enables AI agents to pay for protected HTTP resources using Stellar USDC via the x402 protocol, facilitating automated payments and access to paid APIs.

Enables AI assistants to inspect BLMPay balances, payments, payouts, webhooks, and API capabilities through MCP tools, with write/financial tools disabled by default for security.

Stripe Billing - MCP server providing AI-powered tools and automation by MEOK AI Labs