ecp.dev

What Is It

ecp.dev is a hosted Context Server service managed by the ECP Core Team. Its goal is to help any website quickly create and host an AgentWelcome.md file. It does not replace the user’s own primary domain. Instead, it provides a hosted endpoint that can be referenced from the primary domain via ECP setup, ecp.json, and headers, allowing agents visiting the user’s domain to read the latest site context.

Core Features

In terms of functionality, it covers the creation, in-browser editing, publishing, reading, and ongoing maintenance of AgentWelcome.md. After adding a domain label and writing Markdown content, users receive a ContextServerURL such as https://ecp.dev/abc123.... Even without making further changes to the website itself, users can return to ecp.dev to replace or append content. The page also provides programmatic APIs, including create, replace, append, delete, and login. Content can be managed with a ManagementKey, making it suitable for integration into automated workflows.

Pricing and Ecosystem

The core AgentWelcome.md workflow is clearly free, including creation, hosting, editing, publishing, and serving. The only disclosed paid plan is Dynamic Regions, which is not yet available. It is priced at $5/month per account and is intended for adding dynamic blocks to AgentWelcome.md, such as pricing, inventory, alerts, documentation, and policies. On the ecosystem side, it works alongside the ECP protocol documentation at endpointcontextprotocol.io and the ecp.directory directory, and it also mentions Cloudflare-backed delivery.

Pros and Cons

Its strengths are its very focused positioning, low free-entry barrier, and support for both browser-based and API-based workflows, making it suitable for quickly exposing website context to agents. The limitations are also fairly clear: UsersDomainName is only a label and does not prove domain ownership; the main documentation does not explain open-source status, self-hosting options, service SLA, rate limits, data retention, or permission details; and Dynamic Regions is still marked as coming soon.

Who It’s For and Access from China

It is suitable for developers and site maintainers who are adopting ECP and want AI agents to correctly understand a website’s purpose, target users, documentation entry points, or policy information. For a simple website description, self-hosted static Markdown or general static hosting may be enough as a starting point. The source text does not provide information on access from mainland China, nor does it specify supported payment methods. If using Dynamic Regions in the future, users should pay attention to USD subscription payments and network connectivity.