"Allowing an AI agent to ask user questions during a task" 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.

Open AI Visibility Index for crypto and Web3. Weekly share-of-answer measurements for 24 tracked brands across ChatGPT, Perplexity and Gemini, from a frozen versioned prompt panel. Five read-only tools: full index, per-brand lookup, brand list, complete measurement history and methodology. No auth, no API key. Data is CC BY 4.0 with a permanent archive of every weekly snapshot, so any figure can be verified independently.

Search scored onchain agent frameworks, MCPs, wallets, tools, and live agents.

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required -- just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on Cloudflare's global edge network via Streamable HTTP. All tools are strictly read-only and stateless.

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required -- just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on Cloudflare's global edge network via Streamable HTTP. All tools are strictly read-only and stateless.

Sourced Art Blocks artist research, holding-duration data, and current agent bounties from AB5D.

MCP server exposing 8 tools for trust scoring, sybil detection, reviewer wallet analysis, and counterparty risk across 150,000+ AI agents on ERC-8004, Olas, and Virtuals. Streamable HTTP, JSON-RPC 2.0, no API key required.

Gasless, MEV-protected onchain token swaps for AI agents on 14 EVM chains, built on CoW Protocol.

S3 storage and Solana/Base/Ethereum health checks for AI agents, paid per call via x402.

Abstraxn: public Web3 MCP server for read-only chain data and pay-per-call relays.

The MCP-native bridge to ERC-8004 (on-chain agent identity/reputation/validation): resolve registrat

Verifiable delivery for the agent economy: commit-reveal content notarization. Sellers commit to a d

Ask what you can't be sure of. Read-only checks on tokens, NFTs, wallets and contracts.

Deterministic, machine-verifiable dispute resolution for A2A escrows.

Reputation oracle for AI agents on Base: SAFE/CAUTION/BLOCK + 0-100 score before you pay. x402+MCP

Onchain loyalty MCP on Base: programs, mint, rewards, vouchers for AI agents.

ViridisOS — theorem-backed conservation certification + the unified trust root/mark/toll. Certify pa

Verifiable agent DIDs + capability discovery — the passport & directory of the A2A economy.

Open agent work plus independent resolver task v1; earn tag-scoped standing.

Prediction-market fee/KYC/withdrawal data, venue recommendations, and a paid x402 change feed.