# Markdown negotiation: how many sites actually implement it Home > Standards > Markdown negotiation **10,877 of 14,351 tested sites implement Markdown negotiation.** Measured 2026-08-23. every listed site fetched twice, 23 Aug 2026 · 14,351 listed Checks passed across the 11,005 probed hosts: Markdown negotiation 10,877 · Markdown twin at a predictable URL 5,358 · llms.txt 8,809 · API catalog 3,541 · MCP server card answers 5,129. 4,372 carry it without it working. Any directory can list sites that claim a standard; separating the claim from the behaviour is what this measurement is. ## What it is A site that answers Accept: text/markdown with actual markdown hands an agent the content without the navigation, scripts and layout it would otherwise have to strip. The same URL, a cleaner representation. Specification: https://datatracker.ietf.org/doc/html/rfc9110#name-accept ## How we test it We fetch the page twice — once as HTML, once with Accept: text/markdown — and compare. Since rubric v1.1 the check passes only when the body IS markdown AND differs from the HTML response. A text/markdown content-type header on an HTML body was passing before v1.1. The header is a claim; the body is the evidence, and the two disagreed often enough to be worth re-probing the whole index for. ## Sites that implement it - [VibeMarketolog](https://knowngood.sh/site/agi.vibemarketolog.ru.md) (+2 more hosts on this domain): Russian AI marketing platform offering agents for advertising, analytics, and sales with 24/7 automation and strategy management. - [Aigon](https://knowngood.sh/site/aigon.ai.md): Aigon provides AI agents focused on productivity, education, property, and facilities management with an emphasis on privacy and security. - [BibiGPT](https://knowngood.sh/site/aitodo.co.md): BibiGPT is an AI tool that summarizes and transcribes audiovisual content from multiple platforms with timestamps and structured outputs. - [Mewayz](https://knowngood.sh/site/app.mewayz.com.md): Mewayz is an all-in-one business management platform offering over 144 modules including CRM, HRM, accounting, projects, and POS. - [Ben Milne](https://knowngood.sh/site/benmilne.com.md): Personal blog by Ben Milne featuring essays on value design, protocol thinking, and stablecoin topics. - [BibiGPT](https://knowngood.sh/site/bibigpt.co.md) (+1 more host on this domain): BibiGPT is an AI tool that summarizes and transcribes audiovisual content from multiple platforms with timestamped structured outputs and API access. - [Bl1nk](https://knowngood.sh/site/bl1nk.co.md): Bl1nk offers NFC and QR digital business cards with AI assistant, lead capture, and CRM integration. - [Business.Digital](https://knowngood.sh/site/business.digital.md): Business.Digital is a digital agency offering consulting and implementation for websites, shops, ERP, AI, and software since 2006. - [Commodity Monitor](https://knowngood.sh/site/commodity.worldmonitor.app.md) (+2 more hosts on this domain): Real-time commodity markets dashboard tracking mining sites, processing plants, commodity ports, supply chains, and global trade flows with live context. - [CostLoop](https://knowngood.sh/site/costloop.app.md): CostLoop is a SaaS tool for freelancers, startups, and SMBs to track software subscriptions, renewal dates, costs, and detect savings opportunities. - [TheBaby Agent Ecosystem](https://knowngood.sh/site/craigmbrown.com.md): Provides AI agent security audits, a marketplace with ERC-8004 passports, and API services with tiered pricing. - [Cyberkov](https://knowngood.sh/site/cyberkov.com.md): Cyberkov is a cybersecurity and signal security company in Kuwait offering penetration testing, TSCM, MDR, SOC, digital forensics, and counter-espionage services. - [David Bueno Vallejo](https://knowngood.sh/site/davidbuenov.com.md): Personal site of David Bueno Vallejo featuring information on conferences, projects, and dissemination in research, consulting, and AI. - [Delx](https://knowngood.sh/site/delx.ai.md) (+1 more host on this domain): Delx provides infrastructure and services including agent operations, pay-per-result commerce, web intelligence, media, public data, and blockchain for AI agents. - [EFROS](https://knowngood.sh/site/efros.com.md): EFROS provides cybersecurity, managed IT, 24/7 SOC, and AI governance services under one SLA for US regulated businesses. - [Elektro Hübner](https://knowngood.sh/site/elektro-huebner-gmbh.de.md): Elektro Hübner provides electrical installation and maintenance services including photovoltaic, wallbox, and e-check in the Rhein-Main region. - [Every](https://knowngood.sh/site/every.to.md): Every offers a subscription with ideas, apps, and training from AI practitioners, plus essays and an annual conference. - [Faheem](https://knowngood.sh/site/faheem-ai.app.md): Faheem is an Arabic educational platform offering digital learning and interactive lessons for students and adults. - [JobsPipe](https://knowngood.sh/site/jobspipe.dev.md): JobsPipe provides a unified API aggregating job postings from Workday, Indeed, Glassdoor, and 30+ ATS sources with normalized JSON and a free tier. - [Mojo Links](https://knowngood.sh/site/mojolinks.com.md): Mojo Links is an SEO agency specializing in link building and semantic SEO for regulated niches including legal, medical, finance, and crypto. - [NVDC](https://knowngood.sh/site/nvdc.ai.md): NVDC is a decentralized, OpenAI-compatible GPU inference network with NVTrust attestation and USD settlement via dual-signed receipts. - [Cameron Rye](https://knowngood.sh/site/rye.dev.md): Portfolio of Cameron Rye, a software engineer connecting legacy protocols to modern AI with open-source MCP servers and 20+ years experience. - [Mewayz](https://knowngood.sh/site/seemless.link.md): Mewayz is an all-in-one business management platform offering over 144 modules including CRM, HRM, accounting, projects, and POS. - [SpeakSafely](https://knowngood.sh/site/speaksafely.com.md): Brazilian SaaS platform providing anonymous corporate whistleblowing channels compliant with NR-01 and Lei 14.457, integrating WhatsApp and web for risk management. - [The TAB Index](https://knowngood.sh/site/tabverified.ai.md): The TAB Index provides deterministic daily measurements of AI model output quality with free public API access during promotion. ## Through the API [The 11,269 listed sites that negotiate markdown or ship a markdown twin, through the API](https://knowngood.sh/api/find?has_md=true&limit=25) — a wider set than the one this page counts: every one, in a fixed order, 25 per call, with the total stated. ## Method Measured 2026-08-23. Every figure carries the population it was measured against. Rubric: https://knowngood.sh/benchmark