"Examples of online search and data retrieval services" matching MCP servers:

Enables Web3-focused web searches via the OptimAI External Search API, providing tools to start, retrieve, list, and cancel searches from any MCP-compatible AI host.

Provides a pay-per-query web search tool for AI agents via Lightning Network sats, enabling no-KYC, account-free searches through the MCP protocol.

MCP server that lets AI agents search the substreams.dev package registry.

Read-only MCP server for discovering and ranking on-chain agents on Stellar mainnet via natural language search, reputation probes, and profile lookups.

MCP server for Crypto APIs Block Data product. Get block details by height or hash for EVM, UTXO, and XRP blockchains.

Enables AI assistants to access AnChain.AI blockchain intelligence APIs for risk assessment, sanctions screening, and transaction analysis on blockchain addresses and transactions.

MCP server for Crypto APIs Transactions Data. Enables lookup of transaction details by hash across EVM, UTXO, Solana, XRP, and Kaspa blockchains.

An official Model Context Protocol (MCP) server that provides AI agents with native, real-time access to high-value developer datasets. Currently supports SaaS/AI pricing comparisons, trending developer discussions (V2EX), and real-time Base/Arbitrum gas rates. Free Open Beta is active.

Integrates multiple XRPL data sources including LOS, Validator History Service, XRPL JSON-RPC, and XRPLMeta to provide comprehensive querying of XRPL network data, accounts, transactions, tokens, validators, and more via MCP tools.

Read-only MCP server for Blocksize real-time market data: crypto VWAP, bid/ask, FX, metals and tokenized equities, with pricing, coverage and x402 endpoint lookup. Signed-in users of the Claude, ChatGPT and Cursor connectors get 30,000 free live-data credits every month (1 credit = $0.001); subscriptions from EUR 49/month.

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

GoWeb3 Data MCP Server provides events and news curated by GoWeb3.fyi

Enables AI agents to resolve tokens, get quotes, check for honeypots/rug pulls, build swaps, and retrieve receipts via x402 micropayments.

Pay-per-call MCP server for on-chain blockchain data including wallet profiles, token metrics, protocol TVL, and gas prices.

Enables AI agents to access pay-per-call Base and Polygon onchain data (balances, tokens, transactions, gas, blocks, and trending pairs) settled in USDC via x402, with no API key required.

An MCP server that powers AI agents with indexed blockchain data from The Graph.

Provides enriched blockchain data from Codex for use with MCP-compatible clients like Claude Desktop.

Official CoinGecko API MCP Server for Crypto Price & Market Data. More details: https://docs.coingecko.com/reference/mcp-server

An implementation that enables interaction with the Solana blockchain through the Model Context Protocol, supporting all actions from the Solana Agent Kit for standardized protocol operations.

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