"Using web search to assist with generating answers" matching MCP servers:

Pay-per-use semantic web search for AI agents. Powered by SearxNG, agents pay in sats via Lightning Network micropayments — no API keys required.

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 exposing 17 pay-per-call web, finance, legal and onchain utilities for AI agents: crypto readers and Base deployer intelligence, SEC EDGAR filings, OFAC sanctions checks, insider transactions, 13F holdings, and multi-jurisdiction caselaw and legislation search. Pay per call in USDC on Base via x402 or MPP.

Enables interaction with Binance Smart Chain, including wallet management, token transfers, contract execution, PancakeSwap swaps, and four.meme token creation.

Generates MCP servers from smart contract ABIs, enabling Claude to interact with any Ethereum contract via natural language commands.

Buy at cash-only or unsupported shops by paying crypto (BTC signet, USDC) to a proxy shopper through a 2-of-3 escrow with timelocks over Nostr, or earn as a proxy shopper. Tools that move money act only with confirm: true.

⚡ 87% Token-compressed clean web scraping, YouTube AI transcripts, and PDF extraction for LLMs. Instant Free Trial with zero setup (No wallet/crypto required). Supports gasless agent vaults and EIP-712 on-chain oracle verification on Polygon, Base & Arbitrum.

This MCP wraps Bitrefill public API to allow agents to search for products and shop using cryptocurrencies like Bitcoin, Ethereum, Solana, and many more.

MCP server for the Twelve Permissions NFT collection, enabling verification of seals, retrieval of piece metadata and buy transactions, x402 payment info, and the refusals ledger.

Enables autonomous AI agents to conduct non-custodial commerce using JPYC stablecoin on Polygon, with trust scoring, task evaluation, negotiation, and on-chain verification via Soulbound Tokens.

Enables AI agents to send physical letters and postcards to over 200 countries using Solana cryptocurrency for payment. It provides tools for generating mail quotes, managing wallet balances, and automating physical correspondence directly through the Model Context Protocol.

Enables fetching data from web URLs with automatic X402 payment handling using Solana, including payment tracking, balance checking, and configurable spending limits.

An MCP server for batch-generating wallets compatible with Ethereum and all EVM-compatible chains.

Enables voice assistants and other MCP clients to check whether a Polymarket market is safe to cash out, list markets currently in dispute, verify whether paid-for work was actually delivered, and confirm a signed record is genuine using a local ed25519 check. All answers come back as short spoken sentences with full structured details.

MCP server that answers questions about the Chia blockchain, including balances, blocks, transactions, offers, fees, and more, using the public coinset.org API and CoinGecko for pricing.

Enables AI agents to search a marketplace for already-solved answers, unlock them with internal credits or USDC via x402, and rate, report, or list their own solutions as tools. It also handles account registration and ERC-8004 identity linking, with operator-set spending caps and no custody of funds.

Enables AI agents to pay creators for each citation via the x402 micropayment protocol, with automatic research, grounded answers, and on-chain settlement.

MCP server with X402 payment integration, enabling AI agents to access paid tools like weather, web search, and image generation with crypto payments via MetaMask on Base network.

Enables agents to discover, read, buy, and publish knowledge using USDC on Base, with search and free essays at no cost.