"How to create draft emails using Gmail's support agent class" matching MCP servers:

Enables agents to generate, track, and manage invoices via MCP tools, with CLI support for payment tracking and earnings summaries.

Enables an AI agent to act as a merchant, selling catalog items and issuing USDC invoices with cross-chain payment support via Arcorapay.

MCP server that checks an x402 paid endpoint before an agent pays it, and checks afterwards that the receipt opens to exactly one real on-chain settlement. Two tools, no account, no API key.

An MCP server that lets your AI coding agent (Claude Code, OpenClaw, Codex, Cursor, etc.) discover and pay on-chain agents registered on ERC-8004, using Coinbase's official x402 protocol. No smart account. No bundler. No relay. Just your EOA, an HTTPS request, and an automatic 402 → sign → retry flow.

The MCP gateway that lets any AI agent discover and pay metered APIs on Base or Solana — without the user wiring payments themselves.

Spending limits for AI agents. Create budgets, enforce limits, track spend across x402, cards, MPP, or any payment rail.

Fully autonomous, crypto-monetized MCP server on the Base network. Provides premium smart contract auditing, patching, and token data arbitrage using the x402 micro-transaction protocol.

MCP services for agent security preflight, source scanning, injection screening, proof-of-work policy rehearsal, carbon accounting, climate disclosure and regulatory monitoring. Use each hosted endpoint in the README. Inspect a free quote before buyer-authorized x402/USDC payment. Includes free trust and settlement tools. Maxwell rehearsal does not activate runtime protection.

Provides order, payment, refund, logistics-ticket, and human-handoff tools for e-commerce customer service, enabling agents to query order data, validate access, and create tickets through FastMCP.

Enables AI agents to discover, price, and purchase SaaS products, developer tools, and MCP servers with live Stripe checkout, affiliate program, and AgentTrust verification.

Enables an Alexa+-style voice agent to watch recurring payments and propose renew/deactivate/cancel recommendations without ever being able to move money itself.

Create German invoices (§14 UStG) via Claude or any MCP-compatible AI by describing the invoice in natural language.

Enables external AI agents to search a PayPal sandbox storefront, create and track orders, request refunds, and open disputes within buyer-set spending mandates, while every charge still requires buyer approval in PayPal.

Exposes four stdio MCP tools that let an AI client read sandbox disputes and unpaid invoices, draft persistent payment reminders, and execute reminders only after a human approves them in a separate terminal CLI. This lets finance teams triage PayPal issues and prepare outreach while keeping sending behind explicit human approval.

Enables AI agents to perform free KushBitx token previews, advisory SpendGuard policy evaluations, and discovery of unsigned x402 payment challenges through three MCP tools, with no signing or payment execution.

Foundational MCP/A2A-native core platform for secure credential injection, native x402 micropayments, and Agent-to-Agent routing.

Enables AI agents to discover, call, and pay for existing HTTP APIs over MCP with x402 paywalls, non-custodial settlement, and no code changes to the backend.

Enables AI agents to preview Base token market data, evaluate SpendGuard spending policies, and read x402 payment challenge terms without signing or paying.

Provides trust and commerce checks for agent operators through HTTP x402 and a remote MCP endpoint, enabling clients to inspect x402 quotes, MCP handshakes, and A2A cards and to run paid verification and data tools.

Per-agent quota meter for the A2A network, enabling quota checks with USDC settlement on Base L2 via x402 envelopes.