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"How to Query a Knowledge Graph Using an Ontology" matching MCP servers:

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    MCP server that exposes unified AI-friendly tools over Messari's standardized lending subgraphs on The Graph. One natural-language query → fan out across 40+ lending protocols on multiple chains → get back structured, comparable data.
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    MIT
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    An MCP server that enables querying Polymarket prediction market data through The Graph subgraphs. It provides tools for accessing market stats, trader P\&L, user positions, and orderbook activity using AI agents.
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    Enables AI agents to perform complex crypto operations like cross-chain routing, contract decoding, portfolio management, and anti-rug security checks, returning unsigned transactions for safe signing by the agent.
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    MIT
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    A bridge that connects Dune Analytics blockchain data to AI applications through Model Control Protocol, allowing LLMs to access on-chain data via natural language interactions.
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    MCP server for querying Lido liquid staking protocol data via The Graph's decentralized network, providing tools for staking stats, APR, withdrawals, node operators, and governance.
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    MCP server for querying AAVE V2/V3 lending protocol and governance data via The Graph subgraphs. Exposes 14 tools and 5 guided prompts that any AI agent (Claude, Cursor, Copilot, etc.) can use to query lending markets, user positions, health factors, liquidations, flash loans, rate history, and AAVE governance — across 7 chains (Ethereum, Base, Arbitrum, Polygon, Optimism, Avalanche, Fantom) via
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    MIT
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    An MCP server that exposes the Zapper DeFi portfolio API, enabling LLMs to query wallet balances, token holdings, and DeFi positions using natural language.
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    MIT
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    Provides access to ODEI's constitutional knowledge graph, AI safety guardrails, and EVM smart contract auditing tools. It enables users to query structured domain nodes, validate agent actions, and perform security audits directly through an MCP client.
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    An MCP server for Minuet — the relationship layer for ERC-8004 AI agents. Exposes Minuet's read-only API as a set of MCP tools so any MCP-compatible client (Claude Desktop, Cursor, Cline, etc.) can query the ERC-8004 agent relationship graph natively.
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    MIT
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    Provides tools for AI agents to access Bitcoin, Lightning Network, and Nostr knowledge, including real-time network statistics and Web of Trust reputation data. It features an integrated Lightning Network payment system for micro-transactions and query-based interactions.
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    MIT
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    An MCP server that equips AI assistants with curated knowledge and live chain data for the Alkanes metaprotocol and Subfrost network, enabling them to read docs, query the chain, and scaffold contracts.
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    Enables AI agents to query entities from Arkiv database chains using a SQL-like filter expression, with pagination and configurable fields.
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