"memory" 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.

Open-source MCP server exposing the Agent402.Tools catalog: 500+ pay-per-call tools for AI agents, including browser rendering, web search, PDFs, OCR, LLM inference, code execution, live financial/crypto/macro data, SEC EDGAR, and wallet-keyed memory. Free via proof-of-work, or pay per call in USDC across ten chains via the x402 protocol. No API keys, no signups

The whole Wicked suite for agents in one MCP server: 107 tools across trading data, prediction markets, web search, crypto news, wallet portfolio, DeFi and token risk, SEC filings, agent identity, reputation, a tool registry, hallucination checks, memory and x402 paywalls. No signup; pay per call in USDC on Base.

An AI-powered crypto trading MCP server providing technical analysis, market sentiment, and token swap execution via 0x and DexScreener. It enables users to manage portfolios with built-in risk limits and search historical trade data using vector-based memory.

Public skill package and hosted MCP email infrastructure for AI agents with inbox creation, sending, memory, recovery, and Solana USDC credit payments.