Go to Settings, Integrations. Keys and URLs are checked with each provider when you connect, stored encrypted, and never shown again. Only admins can connect or disconnect.
| Integration | You provide | What it does | Plan |
|---|---|---|---|
| Lemlist | API key | Import campaigns, Send links | Pro, Scale |
| Instantly (Beta) | API v2 key | Import campaigns and lead lists, Send links | Pro, Scale |
| Smartlead (Beta) | API key | Import campaigns, Send links | Pro, Scale |
| Sendkit | API key | Import campaigns, Send links | Pro, Scale |
| Attio | Access token | Import list entries, Send links | Pro, Scale |
| Clay | Nothing; Echo gives you a token | Clay sends rows to Echo. See Clay | Pro, Scale |
| Slack | Incoming webhook URL | Signals in a channel. See Slack alerts | Pro, Scale |
| Your webhook | An https URL | Signed JSON events. See Webhooks | Pro, Scale |
| Cal.com | Nothing; Echo gives you a URL and secret | Marks leads Booked. See Bookings | All plans |
| Calendly | Personal access token | Marks leads Booked | All plans |
To connect Echo itself to Claude, Cursor, Clay or your code, use API keys with the MCP server or REST API.
Connect a tool
- Click Connect on the card.
- Paste the key or URL and click Check and connect.
- The card turns Connected. Use Check key (or Send test) any time; Disconnect removes the key.
If a provider later rejects the key, the card shows Failing with the reason. Reconnect it with a fresh key.
Where to find your keys
| Tool | Where |
|---|---|
| Lemlist | Settings, Integrations, API in Lemlist. |
| Instantly | Settings, Integrations, API Keys. Create a v2 key with read scopes for campaigns, lead lists and leads, plus leads update for Send links. |
| Smartlead | Settings, Activate API. API access depends on your Smartlead plan. |
| Sendkit | Settings, API keys (starts with sk_). |
| Attio | Workspace settings, Developers, create an access token with read and write access to records. |
| Slack | Create an incoming webhook for your channel in a Slack app. |
| Calendly | Integrations, API and webhooks, personal access token. Webhooks need a paid Calendly plan. |