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Search tested AI agent skill files (SKILL.md) for free; buy a file once over x402 in USDC on Base and keep it.

Check whether a text was written by AI (ChatGPT, Gemini, Claude). One read-only tool, check_ai_text: AI likelihood for the whole text and each part. English, Ukrainian, Kazakh, Uzbek, Estonian, Georgian, Lithuanian. Free, no auth.

Domain exposure counters: breaches, infostealers, stolen cookies. Counts only, free.

Hosted MCP server for AI-enriched financial news — full-text and ticker-scoped news search, trending stories, and SEC Form 4 insider activity, each story scored 1–10 for relevance (OAuth 2.1, free tier 100 calls/hour).

CLI + MCP server for SEC 13F institutional holdings, insider trading, and smart money convergence signals. Free anonymous tier, no signup required.

Measure cost per successful task, latency and quality from your own agent traces. Three free analysis tools via MCP, with an ALPNAI key.

Identity infrastructure for the AI economy. 33-trait psychometric engine — belonging probability, trait vectors, attunement depth. Remote streamable-HTTP. Free tier: 16 tools, 10 req/min.

Client-education toolkit for financial advisors: DeFi, art, tokenized real-world assets, PE/VC secondaries, and gender-lens investing as full tracks, plus a beyond-GDP framework found nowhere else, real computation (Monte Carlo, illiquidity pacing), a Reg BI-aware compliance check, and a free SEC/FINRA lookup.

Alternative-asset education for retail investors: DeFi, art, tokenized real-world assets, VC/PE, gender-lens investing, and a beyond-GDP framework found nowhere else, plus real computation (Monte Carlo, illiquidity pacing) and a free SEC/FINRA lookup.

Search live private jet empty legs, estimate private jet and helicopter charters in local currency across 12 countries, browse routes, aircraft and licensed operators, and send a quote request to the Altivo Jets desk. Free remote server, no API key.

Dedicated static outbound IPv4 over WireGuard, with a free 7-day trial on a real address — no card, no sales call.

Computed SEC EDGAR events, XBRL comparisons, insider clusters, Federal Register rules and US federal funding signals, as JSON with provenance for AI agents. 80 free endpoints, free sample on every product, paid analyses from $0.02 per call with prepaid credits or x402.

Convert any URL to LLM-ready Markdown via real Chrome browsers. 3 tools: scrape, crawl, search. Free via MCP, pay-per-use via x402.

Lessons, news and pricing from Apex AI Academy, an AI academy run by agents. Free lessons, no key.

Hosted MCP server: token exit checks on eight chains, Arc launch feeds and yield vaults, Base token verdicts, a web page reader, free X1/Arc faucets. Paid tools via x402.

Brazilian company data (CNPJ) from Receita Federal open data: lookup, alphanumeric CNPJ validation and data load status. Free plan: 50k lookups/month.

API Tool Calls: Home cost planners, proofreading, QR and barcodes, page to Markdown, SEO checks and recalls. Free agent tools: 20 calls/day per IP, no key.

Live onchain governance, vesting, oracle and Safe authority checks. Free samples over MCP.

App Store and Google Play screenshots MCP: your agent captures the app, you edit and export. Free.

Read-only MCP access to Apple Health records. An iPhone companion syncs permitted data to a Mac/Linux receiver you run, reducing repeated exports. Free and open source; iOS 18+ required.

Generate App Store and Google Play screenshots from raw app captures: real device frames, rich-text headlines, multiple store sizes and 15 languages, exported as a fastlane-ready bundle. Runs via npx -y @appscreen/mcp; 5 free renders without a key.

Monitor iOS app reviews, negative-review alerts, rating and version trends on the App Store. Free snapshot; paid review and sentiment intel via x402 USDC.

App Store competitive research for indie iOS developers — ranked keyword search, competitor download and revenue estimates, and iOS In-App Event copy. Free, no API key.

Detect fabrication and hallucination in any LLM output. Score responses from GPT-4o, Claude, Gemini, Llama and 30+ models. Free tier included.

Post, update and search AI-made artifacts (HTML, React, SVG, Markdown, Mermaid) on ArtiGram, a Reddit-style community for things built with Claude and ChatGPT. Tools: post_artifact, update_artifact, search_artifacts, list_communities. Search works without a key; posting uses a free API key from your ArtiGram settings.

Official read-only Helena Bioinformatics MCP for source-cited public knowledge, with an opt-in path to learn about supporting Helena's free scientific infrastructure.

App Store Optimization for iOS apps. Lets Claude, Cursor and any MCP client read your App Store keyword rankings, 30-day history, rank changes and keyword suggestions, and research, measure and track keywords in 115 App Store countries. Runs locally inside the Asoly Mac app over stdio: no API key, no per-request credits, data stays on your Mac. Requires Asoly Pro (free tier for the app itself).

Agent email with recipient allowlist and consent before send. For personal and small-team OpenClaw/Hermes operators. Free to try; Starter $9.99 in-app. Not for cold-outbound fleets. Not an official OpenClaw endorsement.

Comprehensive astrology MCP backed by the AstroWay Calculation API — natal, synastry, transits, Vedic dashas (Vimshottari/Yogini/Ashtottari/Kalachakra), Tarot (Rider-Waite-Smith / Marseille / Lenormand), Numerology, Human Design, AI horoscopes. Sub-arcsecond Swiss Ephemeris precision. 10 000 free credits/month, no card required. Install: npx @astroway/mcp

Official remote MCP server for Atlas Red. Build, restructure and export real, editable mind maps from Claude, ChatGPT, Cursor or any MCP client: brainstorm, plan projects, organise notes and outlines. 27 tools, OAuth sign-in, free and never metered. Hosted (streamable HTTP) — connect at https://app.atlas-red.com/mcp