"Capture The Flag (CTF) cybersecurity competitions and challenges" matching MCP servers:

Enables querying indexed blockchain data via subgraph GraphQL queries, part of the Pipeworx MCP gateway.

MCP server for Chainlink Runtime Environment, enabling build, simulate, deploy, and manage CRE workflows from any MCP client.

Enables AI agents to interact with the Lido protocol for ETH staking, position management, and governance participation across Ethereum and L2 networks. It provides tools for querying balances, simulating transactions, and executing complex workflows like withdrawals and DAO voting through a safety-first interface.

Accept crypto payments on Algorand, VOI, Hedera & Stellar. Create hosted checkout links, verify on-chain payments, and generate MPP/x402/AP2 challenges from any MCP client. Supports all 16 AlgoVoi networks (USDC + native on mainnet + testnet).

Gives AI agents a verifiable identity using Digi-ID passwordless authentication on DigiByte, enabling them to prove who they are by signing challenges without revealing private keys.

Monetization gateway for MCP servers, enabling pay-per-call AI agent access with x402 payment challenges and USDC settlement on Base. Developers can register existing MCP servers, set tool prices, and receive payments without handling payment code.

Production-grade Model Context Protocol (MCP) server delivering paywalled Web3 micro-services powered by autonomous x402 payment challenges on Base Mainnet.

Market-timing bottom/top signals for ten markets — crypto, US/Korea/China/Hong Kong stocks, commodities, FX, inflation and Seoul/Dubai property — returning a verdict and a -100..+100 score per symbol plus market-wide bottom/top scans. Ships a stdio proxy to the ten remote Streamable HTTP endpoints; the free pitch tool introduces each market's catalog.

P2P Crypto and Flashloans. Lets AI agents browse, quote and (optionally) transact with the FlashBank contracts — the P2P term-loan escrow and the flash-loan router — on Ethereum, Base, Arbitrum and the Sepolia playground.

Enables AI assistants to interact with the Hive blockchain through the Model Context Protocol, allowing for account info retrieval, content reading/creation, cryptocurrency transfers, and cryptographic operations.

The NEAR MCP Server enables AI agents to interact with the NEAR Protocol blockchain, providing smart contract interaction, transaction handling, and event listening with AI-driven processing.

The CSPR.trade MCP server provides AI Agents with 14 tools for interacting with the CSPR.trade decentralized exchange on the Casper Network.

Enables AI assistants to store and retrieve data using the Walrus decentralized storage network. Supports blob storage operations, retrieval by ID, and blockchain-verified availability through the Sui network.

Facilitates interaction with the Bitcoin network via the Model Context Protocol, enabling key generation, address validation, transaction decoding, and blockchain data retrieval.

A server that enables interaction with the Solana blockchain, providing access to over 40 Solana RPC methods including getting balances, transaction details, block information, and sending transactions.

A Model Context Protocol server enabling AI assistants to create, buy, and sell tokens on the Pump.fun platform on Solana.

Enables token launching and trading on the Solana blockchain via the LetsBonk launchpad.

Enables privacy-preserving interactions with the Penumbra blockchain, offering tools for transaction queries, validator set information, DEX state, and governance proposals.

An MCP server that allows querying MON token balances and NFT counts on the Monad testnet, enabling Claude Desktop to interact with the Monad blockchain.

Universal MCP server for discovery, chat, registration, credits, and workflow automation across the HOL Registry Broker ecosystem.