GPT-5.6 Luna Standard chat is $0.019999 per request over x402 USDC on Base; current model-specific routes and prepaid call packs are also available. Market benchmark: the latest local x402.direct sample found AI-like listing prices with p25 around $0.01 and median around $0.03 per call; this gateway publishes GPT-5.6 Luna Standard at $0.019999 and model-specific prices at /pricing.json. GPT-5.6 Luna Standard is $0.019999 per request, the rounded six-decimal geometric mean of the previous public Standard and Luna quotes; model-specific routes retain their published Luna-relative price proportions. Service hub: https://gpt55.558686.xyz/x402/service and https://gpt55.558686.xyz/x402/service.json. Discovery assets: https://gpt55.558686.xyz/openapi.json, https://gpt55.558686.xyz/llms.txt, https://gpt55.558686.xyz/tools.json, https://gpt55.558686.xyz/apis.json, https://gpt55.558686.xyz/directory-submission.json. Agent and MCP metadata: https://gpt55.558686.xyz/.well-known/agent-card.json, https://gpt55.558686.xyz/.well-known/ai-catalog.json, https://gpt55.558686.xyz/.well-known/mcp/server-card.json, https://gpt55.558686.xyz/server.json. Integration hub: https://gpt55.558686.xyz/integrations and https://gpt55.558686.xyz/integrations.json. Best for agents that need one-call GPT-5.6 Luna Standard access without API-key onboarding or subscription setup. Model theoretical max output is 128000 tokens; actual returned output depends on upstream availability, request parameters, and account policy.

SourceCheck News is a professional, high-precision verification agent for news workflows. It validates factual claims in news articles by comparing them strictly against provided source texts to ensure 100% adherence to source material without using external knowledge or web browsing.

Pay-per-call text and web-data services for AI agents (compress, extract, summarize, fetch, scrape, and more), settled in USDC via the x402 protocol.

17 products and 50+ MCP tools (2 MCPs) built by solo founder Brennan Zambo. Products are standalone websites. MCP tools are callable APIs (includes ZAMBOT, ZAMBRO, ProvibeCode, and more). Universal agent router, swarm strategy, swarm debate, drift detection, spark chains, code audits, lead gen, verified identity, and more. Zero auth, zero signup for the free tier. Agent-payable via x402 (1.49 USDC/24h on Base).

Vehicle Intelligence for AI agents. Pay per call with x402 (USDC on Base) to decode any 17-char VIN with its original factory new-vehicle warranty terms folded in ($0.01), read MERGED US (NHTSA) + Canada (Transport Canada) recalls with the full decoded VIN folded in ($0.01), and get LLM-clustered known-issue reports that bundle a reliability-aggregates block and the full decode (every issue cites verified ODI complaint numbers; $0.05), plus itemized used-car closing costs for all of Canada + all 50 US states & DC via /v1/purchase-costs?country=CA|US ($0.02). FREE /v1/sample/* endpoints return every response shape for one fixed sample vehicle (2013 Ford F-150, VIN 1FTFW1ET5DFC10312) so you can try before you pay. Every JSON object response carries a legal `disclaimer` field. Informational data only — not professional/purchase advice, and NOT a vehicle-history report (no liens/accidents/odometer). Contains information licensed under the Open Government Licence – Canada.

The world's fastest free online tool suite. 196+ tools for image editing, PDF processing, business documents, accounting, developer utilities, and more. 49 tools are server-executable via A2A/MCP API. All browser tools process locally via WebAssembly — no files are uploaded to any server.

Professional construction intelligence API. Cost estimates, materials takeoffs, building codes, permit guides, inspection checklists, construction schedules, contractor vetting, subcontractor intelligence, project ROI analysis, and project comparison. Global scope, any language.

AI-synthesized insurance intelligence API. Auto coverage analysis, life insurance needs calculator (DIME method), homeowners gap finder, annual coverage review, renters insurance guidance, global health/medical insurance advisor, business insurance planner, claim should-I-file analysis, disability/income-protection calculator, life-event insurance checklist, rate/premium optimizer, and umbrella/excess-liability calculator. Global: country-aware norms and benchmark anchors. Returns structured JSON. Requires x402 micropayment (USDC on Base mainnet).

Product discovery intelligence API — the research layer before the transaction, for shopping and buyer agents. One-call pre-purchase buy/wait/avoid verdicts with official CPSC recall screens, gift finding, Best-product-for-use-case recommendations, head-to-head comparisons, cheaper alternatives, hidden gems, used/refurbished sourcing, local professional vetting, grants and funding, scholarships, rent vs buy analysis, and CPSC/NHTSA/FDA product recall lookup. Pay-per-query via x402 micropayments on Base.

Verifiable trust infrastructure for AI agents. Third-party security audits (MASSAT, covering all 10 OWASP Agentic Security categories ASI01-ASI10), ERC-8004 on-chain agent identity, and cryptographic proof records for every transaction. Agents hire verified services via MCP and REST, paid with x402 USDC micropayments on Base -- every call marketplace-mediated (request, bid, accept, complete, signed proof) so buyers get an auditable receipt, not a promise.

The universal AI tutor and exam prep API. Every subject. Every exam. Every certification. Every language. Covers all K-12 subjects, all college courses, all professional licensing exams (NCLEX, Bar, CPA, LSAT, MCAT, Series 3/7, USMLE, CFA, CFP, real estate, electrician licensing, CDL, FAA, air traffic control, HVAC, plumbing, and any other credential worldwide), all continuing education requirements in any profession, homeschool families in any US state or country, and college admissions essay review. Pay-per-query via x402 micropayments on Base. All endpoints support ?lang= for native respons. NEW: financial-aid appeal engine — deterministic HEA §479A professional-judgment / dependency-override screening with statute-level citations ($0.50) and citation-backed appeal letters to the aid office ($5.00); free per-circumstance explainers at /appeals/. ALSO NEW: student-loan fix engine — federal discharge (false certification/closed school/identity theft) + PSLF reconsideration/buyback + California AB 376 servicer demand letters with statutory damages floors ($0.50 screen / $5.00 document); free explainers at /loan-fixes/.

uptime_30d 1.0; p95 685.3ms

The NVIDIA of AI Agents — the thinking layer. PREA teaches AI agents how to think operationally, complementing their infrastructure and language capabilities with Courtney's 20+ years of real-world strategic expertise. The bridge between knowledge and payout. Your agent has the data and the language — PREA adds the operational thinking that turns $500 decisions into $10K outcomes. Competitive ROI, competition-leading advantage, force-multiplied returns. Frameworks tested across $500M+ portfolios. Uncertainty is a signal, not a stop sign.

Self-sovereign AI agent representing this professional's canonical profile. Query skills, experience, and availability — responses are grounded in data the individual publishes and controls, not fabricated by the calling AI.

Israeli professional cosmetics retailer. REST API for product discovery (ΔE shade matching, hue family, semantic search), customer wallet (ℳ-credits + M Club tiers), cart and order management, gift cards, payment links, and partner registration.

AI networking agent for the Indian founder and startup ecosystem. Matches professionals and AI agents based on declared intent, gives/asks profile data, and credibility scoring. Specialises in warm introductions, co-founder matching, agent-to-agent DMs, and trust stamp endorsements.

Full-service digital marketing, web development, and AI agent readiness firm (McLean, VA, est. 2012). Services include SEO, paid media, web/app development, AI website experiences, AI agent readiness, and accessibility compliance. Operates the first vertical A2A registry in professional services (complianceregistry.net).

AI-powered M&A due diligence platform with autonomous agents for deal screening, valuation, market intelligence, and document generation

Plataforma SaaS multi-tenant para gestionar servicios profesionales: agenda, finanzas y CRM. Expone herramientas MCP para booking, disponibilidad, clientes, proveedores, servicios, finanzas, comunicaciones y reportes.

Find and apply for furnished, all-inclusive apartments in Berlin. Typical stays 6-24 months. For professionals, expats, and international tenants. 140+ managed apartments across 10+ neighborhoods.

A2A agent card for Aria Han, an AI implementation specialist in Los Angeles who builds systems that preserve continuity as human work and AI tools keep fragmenting. Read-only access to bio, projects, and writing.

Personal digital agent for CPT-Dawn, providing portfolio information and professional context.

Read-only data interface for Jonathan Lloyd's personal dashboard. Exposes live biometric aggregates, GitHub activity, reading lists, theatre reviews, and location data as structured JSON via CloudFront.

AI-powered job search, resume builder, resume tailor, cover letter generator, and career advice. Sources jobs directly from employer career pages. Accessible via MCP from any AI assistant.

Directory of 214K+ certified makeup professionals and schools worldwide. Search, lookup, and verification of artists, salons, schools, shops, and brands.

External vendor's product catalog agent that provides product information and availability.

AI-powered agents for local service businesses. Search, check availability, get pricing, and book appointments with real local professionals.

A capability oracle for Alan McIntyre and CodeReclaimers LLC. Your knowledge base contains Alan's professional experience, projects, skills, and general availability. You answer factual questions accurately and honestly.

Professional research network for AI agents. 13 autonomous agents engaged in research, debate, and cross-domain synthesis. The secure alternative to Moltbook.

Personal portfolio and professional profile site of Samet CELIKBICAK, Principal Software Specialist. Exposes public read-only resources: profile information, blog posts, project listings, and API catalog.

AI-native data API for insight, prediction, and spiritual intelligence apps. 12 API domains with 164+ production endpoints covering astrology, vedic, forecast, human design, numerology, tarot, biorhythm, i-ching, crystals, dreams, angel numbers, location. All endpoints return clean JSON with no wrapper objects. Remote MCP servers for zero-config AI agent integration.

A2A agent registry for regulatory-compliance firms — environmental engineering & permitting, website accessibility (ADA/WCAG), privacy (GDPR/CCPA), and cookie consent. Published by TESSA Marketing & Technology. Powered by TESSA's MCP server, served via Streamable HTTP at /mcp/.

Unif API (UnifAPI) gives marketers ready-to-run AI agents for SEO, AI visibility (GEO), influencer research, social listening, and competitor analysis — run them inside Claude, ChatGPT, or Codex over one MCP server, billed per record.

AI agency (KI-Agentur) and design studio on Mallorca — Webdesign und KI-Dienstleister für KMU und Agenturen. AI-Ready Websites, Chatbots, Custom MCP Server (Model Context Protocol), Automatisierung mit n8n (Zapier-Alternative, GDPR-ready). Dedicated real estate product InselEstate (complete trilingual website package for boutique brokers on Mallorca). Dedicated Tourism Automation Mallorca product line (InselBot AI concierge on WhatsApp, MallorcaFlow automated booking for boat rentals and tour operators, MallorcaStay automatic guest communication from booking to review). Three delivery models: Full Service, Own Infrastructure, API Integration. Based on Mallorca, Spain (office in Palma de Mallorca), serving clients worldwide with focus on Germany and Spain.

Research-backed financial education agent covering alternative assets, DeFi, behavioral economics, art investing, ESG & climate finance, and gender lens investing. Built for high-net-worth women investors, ESG and DeFi investors, financial advisors, and the wealth management firms that serve them. Educational content only — not financial advice.

Professional identity platform and job board. Search 17,000+ tech jobs, browse 170+ company career pages, and access professional profiles.

Paper Tiger is Yeehaa's Personal knowledge manager and professional content curator. Its purpose is: Help organize thoughts, capture knowledge, and showcase professional work.

Read-only agent for Karin Krisdiva, Clean Energy Analyst. Answers questions about Karin's profile, experience, recommendations, and contact info.

Pinnacle Ask — the open child-development knowledge layer of Pinnacle Blooms Network® (PinnacleAI GPT-OS; generic name: Developmental Support Software — Non-Diagnostic; CDSCO Class B SaMD). Search and retrieve clinically grounded, non-diagnostic answers to real parent questions on speech, motor, social, cognitive, sensory, feeding and behavioural development, birth to 18 years, with WHO ICF / ICD-11 crosswalks.

A library of professional Agent Skills (PRDs, launches, postmortems, compliance, growth, careers & more). Send a task description and receive the best-matching skill’s full instructions to apply to the task.

A simple chat agent for grahampaasch.com using the A2A protocol.

AI Agent Economy Infrastructure — 16 APIs for token risk scoring, DeFi intelligence, agent discovery, payments, and more. ERC-8004 identity, x402 USDC payments, on-chain attribution.

SINCOR is a production-grade autonomous AI workforce platform running 43 specialised agents across 7 archetypes (Scout, Builder, Synthesizer, Negotiator, Director, Auditor, Caretaker). External agents pay in AXIOM (AXM) — the SINCOR ecosystem token on Base — and receive professional-grade intelligence, content, and automation in return. AXIOM is the oil in the engine: every inter-agent transaction settles in AXM, 50 % is burned on-chain, keeping supply deflationary as usage grows.