"Exploring RAG through defined workspaces" matching MCP connectors:

Abstraxn Agent Kit gives AI agents instant access to real-time Web3, blockchain, and market data with no signup or API key. Access blockchain tools, crypto, wallet, ENS, transaction simulation, and travel APIs through one MCP server, with paid calls settled directly from the user's crypto wallet via x402—without Abstraxn holding or custodizing funds.

Authenticated hosted Streamable HTTP MCP server for crypto data routing through PubFi capability and gateway tools.

An identity and memory layer for AI agents on the Emercoin blockchain. An agent claims a GitHub-rooted on-chain identity and stores verifiable hashes of its research and memory as Emercoin NVS (Name-Value Storage) records, through a small authenticated HTTP API and an MCP server. Neutral and provider-independent — not tied to any single AI vendor. FREE

Production-ready TronSave MCP server focused on helping agents and clients buy and sell TRON resource quickly through one unified interface, with fast order execution, pricing/estimation tools, and secure session-based workflows.

Testnet TronSave MCP server focused on helping agents and clients buy and sell TRON resource quickly through one unified interface, with fast order execution, pricing/estimation tools, and secure session-based workflows.

The OpenZeppelin Solidity Contracts MCP server integrates OpenZeppelin's security and style rules into AI-driven development workflows, enabling AI assistants to generate safe, correct, and production-ready smart contracts. It automatically validates generated code against OpenZeppelin standards (including imports, modifiers, naming conventions, and security checks) and supports various contract types including ERC-20, ERC-721, ERC-1155, Stablecoins, RWA, Governor, and Account contracts through prompt-driven workflows.

The OpenZeppelin Stellar Contracts MCP server generates secure smart contracts for the Stellar blockchain based on OpenZeppelin templates. It integrates with AI assistants to automatically enforce OpenZeppelin's security best practices, style rules, and standards at every prompt, enabling developers to create production-ready Fungible Token, Non-Fungible Token, and Stablecoin contracts through AI-driven workflows.

AgentBridge is the only MCP server that gives AI agents access to structured China knowledge assets—university reports, industry briefings, policy analysis, and real-time web content—through x402 micropayments on Base. Everything is machine-readable, pay-per-use, and settled in USDC.

Live cached Solana decisions and delta feeds purchasable by AI agents through x402.

Insight MCP exposes oracleinsight.xyz data as 30+ MCP tools for AI agents. Fetch prices, consensus feeds, oracle health, stablecoin/wrapped-asset pegs, DeFi position safety, protocol liquidation risk, and daily risk reports — all through natural language. Built on the same REST API with built-in auth, rate limits, and plan gating.

Discover Norynta markets and use caller-signed trading through a protected MCP.

Policy-gated MCP treasury for AI agents. Subscribe via x402 (POST /api/mcp/onboard, USDC on Base), then call 50+ tools for wallets, allowlisted transfers, swaps, bridges, yield, cosigners, and payment requests. Every money-moving action goes through policy checks and explicit confirmation, no raw private keys. Docs: https://fortfiapp.com/agents

An agent-to-agent marketplace where AI agents discover, hire, and pay each other in USDC on Base. Agents list services, post jobs, submit proposals, and invoke each other's capabilities — all through API, MCP, or A2A protocol.