"F-Droid" matching MCP servers:

Pay-per-call USDC payment proxy for AI agents. Issue scoped Pay Tokens with hard spending caps and auto-journal every charge to freee / Money Forward / QuickBooks.

Enables AI agents to scan payment endpoints for safety, returning a letter grade (A–F) and verdict before authorizing payments.

Payment infrastructure MCP server enabling AI agents to make gasless USDC payments on Base and JIT single-use virtual card checkouts, with zero-trust card handling, merchant checkout hints, and signed receipts.

Enables AI agents to analyze payment gateway error messages and receive structured triage results, including likely causes, recommended checks, and retry safety guidance.

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.

10 MCP servers so agents can work in Korea: Naver Smart Store, Coupang, Cafe24, public data (business status, holidays, addresses), HWP files, KakaoTalk, Popbill e-tax invoices & 알림톡, Toss Payments, Japan→Korea sourcing, tax calendar — with human approval on every write. npm @appmonster/mcp-*.

Live market intelligence for AI agents, paid per call in USDC on Base via x402 — no API key or signup. SEC insider trades and insider cluster buying, Polymarket and Kalshi prediction-market odds and 24h movers, 24 US macro indicators with an economic release calendar, and analytics on the x402 agent economy (service rankings, trends, pricing, and a usage-ranked search for paid APIs). Data refreshe

Enables interaction with the Gumroad v2 API, providing access to all 105 seller operations such as products, sales, payouts, subscribers, email campaigns, licence keys, and webhooks.

Model Context Protocol (MCP) server for French Electronic Invoicing (NF XP Z12-013). Provide tools to validate, generate, and explore API specifications for PDP/OD interoperability.

Universal HTTP 402 Micropayment Protocol & Autonomous Economic Settlement Engine for AI Agents on Base L2.

Enables AI agents to issue, void, query, and manage Taiwan e-invoices via 27 MCP tools, wrapping the Universal EC POS Web Service.

Enables AI assistants to create checkout sessions, list products, retrieve orders, and process refunds for Waffo Pancake payments through natural language commands.

Enables CrewAI operators to inspect current fixed-price service offers and purchase requirements, and to invoke a purchase tool only after a deterministic local delegated-authority preflight, with fulfillment waiting on Stripe-verified ledger funding.

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.

Lets agents discover and health-check a directory of live x402 pay-per-call endpoints, probe an individual URL with one unpaid request to see whether it returns a payment challenge and at what price, and read on-chain settlement demand for crawled sellers. It also serves reproducible, solver-verified sudoku puzzles and the pricing, network, and payment details of the studio's paid pay-per-call routes.

A local MCP proxy that connects to remote MCP servers and automatically handles x402 payments, signing USDC on-chain when a tool returns HTTP 402.

Enables read-only consultation of electronic service invoices (NFS-e) from São Paulo city hall via an official source, using a single tool and pay-per-use credits.

Enables AI assistants to classify AI systems against the EU AI Act with requirement checklists and penalty exposure, generate and validate Factur-X / EN 16931 electronic invoices, and assess GDPR and NIS2 readiness directly from the IDE. Runs as a zero-dependency Python stdio server for Claude Desktop, Cursor, and similar clients.

Enables agents to query whether a WordPress plugin, npm package, or PyPI project looks abandoned, returning a live abandonment-risk score, status, and the registry signals behind it, plus raw registry, GitHub, and version history detail. Calls are paid per request in USDC via x402, with free discovery and source-listing tools.

Lets LLM clients such as Claude, ChatGPT and Cursor search, fetch, issue and track Moldova SFS electronic invoices, check async post status, assign serials, and look up taxpayers in the registry. Each user authenticates with their own e-Factura credentials via OAuth 2.1 + PKCE, so invoices can be managed in natural language without touching SOAP or XML.