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About Free multi-engine MCP search server — 8 free engines (DDG, Sogou, Bing, Baidu, Wikipedia, Startpage, Yandex, Mojeek), waterfall progressive search, multi-source verification, content enrichment, news search, language auto-detection, rate limit exposure. Zero API keys needed. Self-hostable.

Analyze AI agent session logs to find token waste and optimization opportunities. Free preview tier with cost breakdown; paid tiers for waste detection and recommendations.

Economic-history and exposure evidence for AI agents on Base, with free discovery and x402-paid reports; provides evidence and limitations, not a credit score or lending recommendation.

Daily AI-ecosystem data for agents: trending GitHub AI-agent repos, Show HN AI launches, MCP server registry, LLM and AI-tool pricing, Hugging Face trending, with history and trends. Free sample tools, no key needed.

MCP server aggregating free tiers, startup credits & developer tool deals. 4 tools, 54 categories, 1,525+ offers.

Find the cheapest working paid API for a task, and check any x402 payment before paying (GO / CAUTION / STOP on price, service health and wallet safety). Remote MCP, free checks.

Trust checks for x402 sellers: verify a seller's on-chain revenue before paying ($0.10), check that an endpoint delivers when paid ($0.25), diagnose why a listing isn't earning ($1.00), free discover by need. Remote MCP server; signed, recomputable verdicts; USDC on Base.

Deterministic eligibility scoring for AI agents, vendors, and tools. Returns CLEAR / HOLD / FAIL verdicts from a published scoring table. Free evaluator, remote MCP endpoint at https://paynemuse.pythonanywhere.com/mcp, already listed in the official MCP Registry as com.pythonanywhere.paynemuse/agent-eligibility. Paid deep evaluations available via x402 micropayments.

Cited web evidence and claim verification for AI agents: send a question or claim plus public URLs and get source-linked passages with retrieval times and content hashes. Discovery is free; each call is paid in USDC on Base over x402.

Scan any public URL for hidden instructions aimed at AI agents (prompt injection in hidden text, comments, metadata). Free, no auth.

Let AI agents publish, claim, deliver and review human or AI tasks worldwide. Remote MCP at https://kicorn.com/api/mcp; public discovery without login, verified-email Bearer for private actions. Free or paid tasks in HKD/USD; payments remain outside the platform.

Deterministic compliance and vertical knowledge bases for autonomous agents. Free 24hr trial.

Independently verify an agent's output before you pay: structure, formats, ranges and cross-field rules, with a signed attestation and receipt. 3 free calls a day, then x402 v2.

Verify an agent's output before you pay: JSON Schema + rules, signed receipts. Free during launch.

Read-only MCP server exposing a machine-readable catalog of Gumroad AI-agent tools and datasets (JSON Schema / JSONL / CSV / Python); tools: list_products, get_product, purchase_info. Free; no payments through the server.

Turns any URL or PDF into clean Markdown/JSON for AI agents. Remote MCP (read_url, search, get_balance) + REST API; 5 free reads/day, then $0.005/call via x402 USDC on Base, no account needed.

ChatGPT sign-in via OAuth at https://api.agentrenderapi.com/mcp — no key to paste. Claude, Cursor and other clients: uvx agentrender-mcp with a free 150-render key. Tools: screenshot, PDF, extract, health.

MCP + REST for AI agents — turn any public URL into a screenshot, PDF, or structured extract with render receipts. Free waitlist key; paid plans from $17/mo.

Warsaw Stock Exchange (GPW) data for AI agents: quotes, ESPI/EBI filings with an assessment of each one, quarterly KPIs from company reports, earnings forecasts with a track record, and portfolio analytics in PLN. 93 tools, hosted, free account.

69 pay-per-call tools for AI agents: web pages to Markdown, screenshots, PDF, OCR, web and discussion search, crypto and market data, Polymarket, DeFi yields, validation, charts. Paid per call in USDC on Base or Solana via x402 inside the MCP tool call. No account, no API key. Free sample on every tool.

13 free utility tools for AI agents: web text extraction, markdown/HTML conversion, hashing, encoding, UUIDs, date math, unit conversion, JSON formatting.

35 prepaid APIs for HTML, JSON, shopping data and agent configuration, with free discovery through a local Node.js MCP adapter.

DuckDuckGo web search + URL fetcher for AI agents. No API key needed for free tier (7 req/IP/day), Pro tier unlimited with API key.

Assess job responsibilities for unclear scope and ownership. Free findings, report quotes, and private human review links through MCP.

Roslyn MCP server and CLI for C#/.NET code intelligence: semantic code analysis and navigation for coding agents - callers, change impact, implementations, dependency injection, tests, side effects, dead code and token-budgeted context. Runs locally over stdio, no telemetry. Closed source; free for individuals, education and organizations below the license thresholds.

Sourced prices, market rates, buyers, licensing deals and court rulings for AI training data, plus a valuation from public prices. Free, read-only, no key.

Curated AI news, daily briefs, trending stories and LLM leaderboard for your AI assistant (remote, needs a free personal token)

AI Image Cleaner is a free, browser-based photo cleanup tool designed for people who need to erase unwanted people, objects, text, or watermarks - and fill the hole with AI inpainting - without installing desktop software or hitting a payment wall on day one. Positioning: AI Image Cleaner is both the brand and the product domain (ai-image-cleaner.com). The homepage is the workbench (upload -> brush mask -> clean -> download). Tool landing pages under /tools/ handle specific intents such as AI object remover, remove person from photo, AI watermark remover, remove text from image AI, and remove object from photo, so the main workspace stays uncluttered. Getting started: visit https://ai-image-cleaner.com, upload a JPEG or PNG, paint only the region that

Korean stock market data with no auth and no API key. Remote MCP server (12 tools) for KOSPI/KOSDAQ/KONEX T+1 settled closes, DART regulatory filings with receipt timestamps, quarterly and preliminary earnings, 250 trading days of per-stock history, and post-filing price paths by filing type. Refreshed every trading day at 18:10 KST. Public open data, freely redistributable.

SDK-free MCP server framework — self-implemented protocol engine (2026-07-28 + legacy), 19 plugins, OWASP security, zero dependencies