Overview
corelayer0 — OpenAPI → hosted MCP server in 30 seconds
Every API you want an LLM to use normally means writing and maintaining a separate MCP server. corelayer0 automates that: upload your OpenAPI spec and get a hosted MCP URL that works instantly in Claude, ChatGPT, Mistral, or any compatible client.
How it works
- Import your OpenAPI spec (3.x or Swagger 2.0 — JSON, YAML, or a public HTTPS URL)
- corelayer0 generates a hosted MCP server — one typed tool per endpoint
- Paste the MCP URL into your LLM client. Update your spec anytime; the URL stays stable.
Key features
- Auth injected server-side — credentials never reach the LLM (no-auth, Bearer, or OAuth2 client credentials)
- Code Mode for large APIs — two fixed tools (search + execute) at ~constant token cost
- Native OAuth 2.1 per project — PKCE, dynamic client registration, auto rotation
- EU-hosted / GDPR-native — OVHcloud France, secrets under an EU KMS, outside the US CLOUD Act
Pricing
Free during public beta — 100 endpoints, 5,000 calls/month, no card required.
Server Config
{
"mcpServers": {
"corelayer0": {
"url": "https://cl0.run/<your-project-id>"
}
}
}