"The most widely used models" matching MCP servers:

Enables AI agents to gate real-world side effects through a durable decision record, ensuring at-most-once initiation, deduplication, budget enforcement, and auditable outcomes across retries and failures.

Enables AI agents to list, search, create, update, mark used, and delete vouchers, coupons, gift cards, and loyalty cards via a token-authenticated JSON API.

MCP server to connect AI assistants to the AdvinPay payment API, enabling PIX charges, transaction queries, and documentation search.

Integrates PayU payment services with AI tools through the Model Context Protocol, enabling payment link creation, transaction retrieval, and settlement analysis.

An MCP server that enables AI agents to search, pay for, and call paid APIs using the x402 protocol, with automatic USDC settlement.

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

Enables creating non-custodial payment drafts and pay links for BTC, USDC, USDT, and EURC, with signing and broadcast remaining in the user's wallet.

Proxies an existing MCP server to add an x402 paywall, charging AI agents per tool call without modifying the upstream server.

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.

Enables AI agents to discover and interact with a merchant's commerce layer, including product listing and checkout creation, while payments settle directly to the merchant's Stripe account.

An MCP server that acts as a secure, multi-tenant proxy to the InvoiceShelf API, enabling AI assistants to manage invoices, estimates, customers, payments, expenses, and more with 109 tools and TOON compression for efficient token usage.

An MCP server for the Pluggy Open Finance Brazil API, enabling connection to bank accounts and management of financial data including transactions, accounts, investments, and payment intents through natural language.

MCP server that enables AI agents to automatically pay for and access paywalled content via the x402 payment protocol.

Financial data infrastructure for AI agents. Connect to a startup's books to read live P&L and bank balances, review and reclassify transactions, manage the chart of accounts, and connect banking sources.

Discover, pay for, execute, and publish monetized APIs directly from your agent, settled per call in USDC over x402, through the Model Context Protocol.

Enables AI agents to send Norway B2B e-invoices over the Peppol network in EHF format via Storecove, including recipient discovery, invoice creation, and delivery evidence.

Read-only MCP server for the Helcim payment API, letting AI agents safely query customers, invoices, card transactions, subscriptions, and more without risking financial mutations.

MCP server for the Stripe API with 10 tools covering payments, customers, invoices, and subscriptions. Generated with MCPForge. Destructive and financial operations require human approval.

MCP server for the Quickfile REST API v2, supporting multi-account and secret-isolated configurations with 45 tools for managing Quickfile data.