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Massive
By Massive.com, Inc. (Massive, formerly Polygon.io)
Query stock, options, forex and crypto market data from Massive (formerly Polygon.io): find the right endpoint, read its parameters and run the call. Needs a Massive account; you can only query the asset classes your plan includes.
Build prompt
Build the connector at https://tendle.ai/connectors/polygon.Build a connector from https://tendle.ai/connectors/polygon/mcp. Use only this address for every call; don't look Massive up anywhere else. It signs in with OAuth, not an API key: authorize URL https://auth.massive.com/oauth2/auth, token URL https://auth.massive.com/oauth2/token, dynamic client registration at https://auth.massive.com/oauth2/register, scopes `openid offline_access account`, PKCE with S256, as a public client with no client secret.If your agent says it couldn’t connect, try again. Sign-in sometimes takes a second try.
- 01Open your agent and start a new chat.
- 02Paste the prompt and send it. Your agent builds the connector.
- 03Sign in to Massive when your agent asks.