"Answer Engine Optimization (AEO) Audit Guide" matching MCP servers:

A standard MCP server for discovering AI agents and negotiating signed skill contracts. Buyer-seller payments are settled directly outside the platform; Agent Economy Engine collects only a platform fee after both parties attest completion.

Performs static security analysis of Solana programs and generates x402 payment invoices for automated agent-to-agent audit workflows.

MCP server exposing a Lightning wallet to LLM agents over Nostr Wallet Connect (NIP-47): balance, invoices, LN address/LNURL payments, batch pay, and keysend. All spend tools are wrapped in a defense-in-depth safety stack — budget caps, allowlist, two-step confirmation, audit log.

An MCP server that provides programmable spend limits and audit trails for AI agents to make payments from a dedicated wallet, preventing overspend and unauthorized transactions.

Gives your agent a private Kinematic Drive: a deterministic memory engine for sub-millisecond exact recall over code and docs with no hallucination. Also provides self-serve checkout and metered pay-per-call tools for AI agents.

Enables managing Corpay One accounts-payable workflows including expense listing, coding, and policy-controlled writes, with read-only defaults and audit logging.

An MCP server for Valta that exposes financial governance tools for AI agents, including spend authorization and audit trail via MCP-compatible clients.

Provides real-time Stripe subscription analytics including MRR, churn, failed payments, and expiring trials. Enables AI assistants to answer business health questions like 'How's my business doing?'

Enables AI agents to answer Cryptbrew product questions and check live API health without merchant authentication. Exposes tools for pricing, FAQs, invoice flow, and health probes over stdio or streamable HTTP.

Connects AI assistants to Quaderno's tax compliance engine, enabling tax calculation, tax ID validation, and invoice creation via natural language.

Enables AI agents to manage financial operations including balance checks, money transfers, invoicing, spending policies, and audit logs through the PayGent API.

Generic Lightning-paywall sidecar that wraps any stdio MCP server and requires a paid Lightning invoice (via NWC) before forwarding priced tool calls. Per-tool prices are set via env; includes payment verification, replay protection, and an audit log — the upstream server stays untouched.

Enables MCP clients to drive every admin and user operation of the SHM billing panel (148 generated tools plus search, describe, status and audit-tail helpers) through a single server. Includes read-only or read-write gating, deny rules for dangerous endpoints, secret redaction, confirm-preview for mutations, and a JSONL audit log.

Kill switch + spend guard for AI agents that spend money: one policy, one sub-second freeze, and one signed audit ledger across every wallet vendor at once (Coinbase, Turnkey, Openfort + cards). Tools include a pre-flight request_spend guard, freeze, apply_policy, ledger, and x402/AP2 payment-mandate guards — free self-serve key, no account.

Enables responders to discover, read, and answer data requests via the Reqport API, providing tools for health checks, request listing/reading, payload decryption, and responding to business-relationship or generic requests.

Enables AI agents to verify proposed payments against their assigned task, budgets, permitted categories, and counterparties, returning an ALLOW or DENY decision with a tamper-evident audit trail.

Enables AI agents to propose structured payment intents, apply deterministic policy, require human approval, and record tamper-evident audit trails without connecting to live payment rails.

Enables secure expense claim management with tools for listing, submitting, approving, and refunding expenses. It layers ThunderID scopes, runtime policy decisions, and application rules to authorize each call, with a full audit trail.

MCP server that validates semantic version ranges using npm's semver engine, with payment via x402 on Base mainnet.

Non-custodial payment engine for AI agents supporting BTC, ETH, USDT, USDC, XRP, XMR, and ZEC. Exposes wallet, invoice, and payment tools over MCP with per-agent spend limits, plus x402 pay-per-call support.