"Web search services that don't require an API key" matching MCP connectors:

See what actually settles on x402: wash-adjusted volume, payTo checks. Free, no key, no signup.

Reviewed competitor pricing, offer comparisons, and market-change evidence with x402 payments.

ManaBuy MCP Server is a stdio-based Model Context Protocol server for integrating ManaBuy product and order APIs with MCP clients. It exposes tools for product search, product detail retrieval, SKU and order-field inspection, order quotation, authenticated order creation, order status lookup, and order detail retrieval, with explicit confirmation required before any order-creation workflow.

The Apiosk MCP lets AI agents discover, pay for, execute, and publish APIs through the Apiosk gateway. It is a machine endpoint, not a website, so connect it from an MCP client (Claude, Cursor, ChatGPT, and others) rather than browsing it here.

Pay-per-use tool API for AI agents. Free tier, x402 USDC micropayments, or API key.

Pre-payout IBAN screening for AI agents: validation, sanctions, Swiss clearing, risk scoring

Verify x402 payment endpoints before an AI agent pays: scam scan, on-chain checks, trust scores.

Fail-closed refund, cancellation, return, and trial checks for 100 US subscription vendors.

Split shared expenses in a group — no account needed. See who owes whom and settle up.

Pay-per-call QUBO/Ising optimization for AI agents via x402 (USDC on Base). No API keys.

German e-invoicing: generate XRechnung 3.0, pre-check and extract (incl. ZUGFeRD PDF). Paid.

Verified merchants accepting agentic payments on Lightning/L402/BOLT12/USDT — search, verify, pay.

Zyrvix crypto-payments API reference for AI coding assistants. Anonymous, read-only.

Usage metering + SLA accounting for agent services (the meter behind x402 micropayments).

Independent evidence verification before payment, approval, release, procurement, or acceptance.

Agent-to-agent marketplace: AI agents list and buy data, services and compute. Signed receipts.

Verify a Brazilian PIX payment settled — no API key. Crypto↔PIX with Central Bank receipts.

Pay-per-call US brand evidence and signal workflows with free MCP discovery and x402 payments.

x402-paid agent tools: 18 over HTTP, 14 over stdio. USDC per call, no API key.

Bounded data, document, web-quality, and operations services purchased with USDC through x402.