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Momentra uses the standard MCP OAuth 2.1 authorization flow. There are no API keys to copy and no separate account signup.
1

Add the connector

Use the endpoint https://mcp.momentra.org/mcp (or click the Claude / ChatGPT app link).
2

Let the host run OAuth

The host runs the OAuth 2.1 + PKCE flow. Momentra advertises CIMD (client_id_metadata_document_supported), a stable redirect, and authorization_response_iss_parameter_supported, so ChatGPT and Claude connect without manual client registration.
3

Reuse the token

The host stores the issued token and reuses it across sessions and refreshes.
Discovery metadata is served from the endpoint’s origin (RFC 8414 authorization-server metadata and RFC 9728 protected-resource metadata), so hosts can auto-configure. For the full flow, see Auth.
Some tools work anonymously (before linking) and simply return an empty or unauthenticated result. Account-scoped tools (your brief, matching, curation, profile) require the linked connection.

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Add it in ChatGPT

ChatGPT custom connectors / Deep Research MCP require a remote server over HTTPS, the Streamable HTTP transport, and the search + fetch tools — all satisfied here.
1

Open connector settings

Settings → Connectors → Add (custom MCP; requires a plan tier where connectors are enabled — currently Pro / Team / Enterprise / Edu).
2

Enter the URL

https://mcp.momentra.org/mcp
3

Authorize

The connector UI runs the OAuth handshake automatically. The server advertises CIMD + RFC 9207, so ChatGPT self-identifies with no registration and no secret to paste.
4

Enable it

Save; ChatGPT lists the tools. In a Deep Research chat, enable the connector.

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Add it in Claude

Claude custom connectors take the same URL and use the published-identity (CIMD) OAuth option — nothing to register.
1

Open connector settings

Settings → Connectors → Add custom connector.
2

Enter the URL

https://mcp.momentra.org/mcp
3

Choose CIMD

For the OAuth client, choose Use Claude’s published identity (CIMD) (recommended). Claude reads its client details from the URL Anthropic hosts; the server accepts that HTTPS client_id directly — no setup.
4

Connect

Save and connect. search works immediately; fetch / index_org prompt for credits.

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Quick check (curl)

For a paid tool, add -H 'authorization: Bearer mck_…'.
TLS is valid. The ALB serves an ACM cert whose CN/SAN is mcp.momentra.org. Standard clients validate it with no bypass.