"FIRST" matching MCP servers:

The first commercial implementation of HTTP 402 Payment Required for creator content monetization. AI agents pay $0.0025 per content pull from paywalled creator libraries. Creators get paid automatically.

Non-custodial USDC <-> bank for AI agents. Free quotes; $0.05 USDC per session via x402; 1% commission itemised in every quote. Own funds only. PT + EU/EEA (not UK). 18+.

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.

Enables users to track unpaid invoices and generate an escalating ladder of payment-reminder letters — first reminder, second reminder, and final notice — anchored to the due date, plus overdue listings, aging buckets, and a daily chase list of what to send today. It records payments and letters sent, rendering each letter as Markdown or printable HTML without ever emailing anything itself.

Local, privacy-first access to bank and credit-card transactions for Copilot, backed by SimpleFIN.

Enables agents to price, send, and track encrypted file transfers, with files chunked, encrypted, and hashed locally before any network relay, and to retrieve signed collection receipts. It supports prepaid credit pools and gives agents a privacy-first transfer capability within their own trust domain.

A privacy-first MCP server providing 14 offline Brazilian utilities including document validation, boleto parsing, PIX BR Code generation/parsing, and calendar tools.

Free, open-source (MIT), local-first Swiss accounting MCP server: an AI agent posts double-entry journal entries, categorises and chases invoices, and prepares the MWST-Abrechnung (the Swiss VAT return), with a minimalist Studio for human oversight. Posted entries are append-only and immutable, corrections are reversing entries, and every query is tenant-scoped.

Enables read-only, local-first access to American Express financial data via seven MCP tools, including accounts, transactions, statements, portfolio reports, and fraud alerts, with encrypted on-device storage and an outbound-only secure tunnel.

Lets a user ask what their business is owed, who to chase first, and get a chase email drafted in their own voice, via tools for weekly totals, chase queues, customer history, due-soon invoices and insights. Every tool only reads or returns a draft, so nothing can be sent.

MCP server for agent-first double-entry bookkeeping for Dutch SMEs, supporting VAT, Peppol BIS 3.0 e-invoicing, and local-first SQLite storage with full audit logging and deterministic JSON output.

Provides a read-only MCP gateway and quote-first buyer client for the GPT55 x402 service, enabling service discovery, catalog access, and safe payment quote checking without signing transactions.

MCP server for noui.bot Agent Bazaar — agent-first infrastructure tools. Platform stats, service discovery, deploy rail, and feedback reporting. Install via npx -y @forthebots/mcp-server.