SingIt MCP

A remote Streamable HTTP server with JSON responses only. No local server installation is needed. Endpoint: https://app.singitai.app/mcp. Official MCP Registry name: app.singitai/singit. Server: singit, “SingIt x402”, version 0.1.3; protocol 2025-06-18.

Get a key

Open SingIt, then Settings → API keys. Free tools and tools/list work without a key. Export SINGIT_API_KEY in the environment that launches your client. Paid tools are paid per call within the key’s caps; get_limits shows what is spent and left today. See spending limits and developer setup.

Install

Claude Code

Verification: Command checked against Claude Code docs, 31 October 2026; not run here.

claude mcp add --transport http singit https://app.singitai.app/mcp --header "Authorization: Bearer $SINGIT_API_KEY"

Verification: Documented client checks; not run here.

claude mcp list
claude mcp get singit
# In Claude Code: /mcp

For a shared project, use this .mcp.json entry. Claude Code requires type: http for a URL entry.

Verification: From the Claude Code docs, 31 October 2026 (it expands ${VAR} in headers); not run here.

{
  "mcpServers": {
    "singit": {
      "type": "http",
      "url": "https://app.singitai.app/mcp",
      "headers": {
        "Authorization": "Bearer ${SINGIT_API_KEY}"
      }
    }
  }
}

Cursor

Edit ~/.cursor/mcp.json, then restart Cursor. The deeplink adds a keyless server; configure the header for paid tools.

Verification: Matches the repository installation guide; not run on Cursor.

{
  "mcpServers": {
    "singit": {
      "url": "https://app.singitai.app/mcp",
      "headers": {
        "Authorization": "Bearer ${env:SINGIT_API_KEY}"
      }
    }
  }
}

Add to Cursor

Codex

Verification: Run on 31 October 2026 with codex-cli 0.163.0: the flags match --help, and the command was run in a temporary CODEX_HOME.

codex mcp add singit --url https://app.singitai.app/mcp --bearer-token-env-var SINGIT_API_KEY

Verification: Exact config.toml written by that run. codex mcp list showed enabled with Auth “Bearer token”.

[mcp_servers.singit]
url = "https://app.singitai.app/mcp"
bearer_token_env_var = "SINGIT_API_KEY"

Windsurf / Devin Desktop

Windsurf was renamed Devin Desktop in June 2026. Use mcp_config.json: macOS/Linux ~/.config/devin/mcp_config.json; Windows %APPDATA%\devin\mcp_config.json. Open the config from the client to locate the active file. Remote entries accept serverUrl (or url), headers and ${env:NAME} interpolation.

Verification: From the vendor docs; not run on a Windsurf install.

{"mcpServers":{"singit":{"serverUrl":"https://app.singitai.app/mcp","headers":{"Authorization":"Bearer ${env:SINGIT_API_KEY}"}}}}

Generic HTTP client

Verification: Copied from llms-install.md; check your client’s variable interpolation support.

{
  "mcpServers": {
    "singit": {
      "url": "https://app.singitai.app/mcp",
      "headers": { "Authorization": "Bearer ${env:SINGIT_API_KEY}" }
    }
  }
}

Verify

Verification: run against the live server on 31 October 2026, no key.

curl -sS https://app.singitai.app/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"singit-docs-check","version":"1.0"}}}'

Verification: run against the live server on 31 October 2026, no key.

curl -sS https://app.singitai.app/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/list"}'

Expected: initialize returns serverInfo.version 0.1.3; tools/list returns 16 tools. Both requests are free and need no key. A missing, empty or unexpanded-variable header behaves like no key. A wrong or revoked key gets HTTP 401 (verified 31 October 2026 with an invalid key).

Tools

Snapshot fetched 31 October 2026. Read-only and idempotent values below are server annotation hints. Read-only paid calls still charge; repeating a non-idempotent call charges again. Account-read tools require a key but no paid-tool scope.

Troubleshooting