"Persistent" matching MCP servers:

Persistent memory and payment safety for AI agents on Lightning. Enables agents to remember purchases, track vendor reputations, enforce budgets, and share trust signals via Nostr.

Enables agents to sell MCP tools and Hermes capabilities behind an x402 v2 / USDC payment gate, and to buy other agents' capabilities through a wallet tool. Sellers quote a price, verify the exact transfer and nonce, then execute, while buyers get recipient allowlists, per-call limits, and a persistent cumulative budget.

Gives AI agents persistent, shared project memory so they can record decisions, failed attempts, tasks and notes, then retrieve a ranked, budget-trimmed slice of what matters across sessions and tools. Access is metered per call in USDC over x402 with no account or API key required.

A stateless, anonymous MCP edge node exposing three paid JSON-RPC tools on Cloudflare Workers: digital-asset rights pre-check, C2C lead sniffing, and portfolio valuation. Requests are metered per call through an x402 testnet paywall (Base Sepolia / Polygon Amoy) with no IP, user-agent, or persistent storage.

Enables AI agents to browse a merchant catalog and place Razorpay test-mode orders with budget gating, persistent monthly limits, and full audit trails.

Enables MCP clients to enforce deterministic budget gates and persistent audit trails for model-driven tool purchases, with stdio tools bound to an existing task.