# Connect SendGrid to OnceOnly When **New bounce** fires in [SendGrid](https://apiant.ai/connections/sendgrid), your agent runs **Add event** in [OnceOnly](https://apiant.ai/connections/onceonly). Describe the whole flow and it is built, tested on every scenario and kept running. SendGrid **4** triggers SendGrid **10** actions OnceOnly **11** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want SendGrid and OnceOnly to do together? Give your AI client this address. `https://mcp.apiant.ai` Any client that takes a remote MCP server. Nothing to install. Create your free account, then sign in once in your browser. ### Set it up in your client ### Claude Code Run this in the directory you want to work in. `claude mcp add --transport http -s project apiant-ai https://mcp.apiant.ai` Start Claude Code there, approve the server, and sign in in the browser page it opens. [Claude Code guide (opens in a new tab)](https://apiant.ai/docs/mcp/claude-code) ### Claude, web and desktop Open Customize, then Connectors, then Add custom connector, and paste the address. On Team and Enterprise an owner adds it first. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Cursor Add the address to your MCP configuration as a server URL. Cursor signs you in in your browser. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Zed Open Settings, then AI, then MCP Servers, then Add Server, then Add Remote Server. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Codex and the ChatGPT desktop app Open Settings, then MCP servers, then Add server, and choose Streamable HTTP. From the terminal, Codex takes the address with its own add command and then signs you in. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) ### Any other MCP client Paste the address where the client asks for a remote MCP server URL, and name the server apiant-ai where it lets you. APIANT's skills reach the client over the same connection. [Setup guide (opens in a new tab)](https://apiant.ai/docs/mcp) Example flows ## What SendGrid can start in OnceOnly - When **New bounce** in SendGrid then **Add event** in OnceOnly - When **New global suppression** in SendGrid then **Add policy** in OnceOnly Starting points drawn from the triggers and actions in the catalog today. Describe the flow you need, at any depth, and your agent builds it and tests every scenario before it ships. Everything your agent can do with SendGrid and OnceOnly ## Triggers and actions 4 triggers · 21 actions - Trigger **New bounce** Polls the v3 Suppression Bounces API for bounced email addresses. Emits one record per bounce. - Trigger **New global suppression** Polls the v3 Suppressions API for globally-suppressed (unsubscribed) email addresses. Emits one record per suppressed email. - Trigger **New or updated recipient** Triggered when a recipient is created or updated. - Trigger **New suppressed email** Triggered when a new email is suppressed. - Action **Add to suppression group** Add a recipient's email to a SendGrid suppression group (unsubscribe group). - Action **Create custom field** Creates a new custom field. - Action **Create list** Creates a new marketing contact list via the v3 Marketing Lists API. - Action **Create or update contact** Adds or updates a marketing contact (upsert by email) via the v3 Marketing Contacts API. Optionally assigns to lists. - Action **Create or update recipient** Creates a new recipient if the email does not exist, otherwise updates the existing recipient. - Action **Delete contacts** Deletes one or more marketing contacts by their contact IDs via the v3 Marketing Contacts API. - Action **Get contact by email** Looks up a marketing contact by email address via the v3 Marketing Contacts search-by-emails endpoint. - Action **Remove from suppression group** Remove a recipient's email from a SendGrid suppression group (unsubscribe group). - Action **Send an email** Sends an email via the v3 Mail Send API to a single recipient with subject and plain-text or HTML body. - Action **Send an email using template** Sends an email via the v3 Mail Send API using a dynamic template ID. Dynamic template data is passed as a JSON object. - Action **Add event** Adds an event to an agent run's timeline in OnceOnly, such as a step starting, a tool call, or a failure. - Action **Add policy** Creates or updates the governance policy for an agent, such as rate limits, spend limits and allowed or blocked tools. - Action **Add tool** Creates or updates a tool in your OnceOnly tool registry, pointing at your backend URL. Returns the saved tool without its secret. - Action **Check & Lock** Checks an idempotency key and locks it if it is new, telling you whether the event is a first occurrence or a duplicate. - Action **Delete tool** Permanently deletes a tool from your OnceOnly tool registry. - Action **Get policy** Returns the governance policy configured for an agent. - Action **Get run** Returns a run's timeline: the run id, the total number of events and the list of events recorded for it. - Action **Get tool** Returns the details of a registered tool by name, including its URL, scope, enabled state and retry settings. - Action **List policies** Returns every agent policy on the OnceOnly account, each with its agent id and policy settings. - Action **List runs** Returns the runs recorded on your OnceOnly account, with each run's latest status and event count. - Action **List tools** Returns the tools registered in your OnceOnly tool registry for a scope. ## Each app on its own - [ **SendGrid** SendGrid by Twilio — email delivery and marketing platform.](https://apiant.ai/connections/sendgrid) - [ **OnceOnly** OnceOnly is an idempotency API that prevents duplicate automation runs by blocking repeated events in...](https://apiant.ai/connections/onceonly) Reviews ## What our customers say ## More from SendGrid - [ **SendGrid to Mailchimp** Mailchimp marketing automation and email platform.](https://apiant.ai/connect/sendgrid-to-mailchimp) - [ **SendGrid to Stripe** Stripe is a payment processing platform for online businesses.](https://apiant.ai/connect/sendgrid-to-stripe) - [ **SendGrid to Shopify** Shopify is a commerce platform for online stores and retail point-of-sale.](https://apiant.ai/connect/sendgrid-to-shopify) - [ **SendGrid to Trello** Trello is a visual collaboration tool that organizes projects into boards, lists, and cards.](https://apiant.ai/connect/sendgrid-to-trello) - [ **SendGrid to Webflow** Webflow is a professional website builder and CMS for designing, building, and launching responsive...](https://apiant.ai/connect/sendgrid-to-webflow) - [ **SendGrid to Anthropic** Anthropic builds Claude, a family of large language models.](https://apiant.ai/connect/sendgrid-to-anthropic) ## More into OnceOnly - [ **HubSpot to OnceOnly** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-onceonly) - [ **Salesforce to OnceOnly** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-onceonly) - [ **Slack to OnceOnly** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/slack-to-onceonly) - [ **Google Sheets to OnceOnly** Google Sheets](https://apiant.ai/connect/google-sheets-to-onceonly) - [ **Gmail to OnceOnly** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-onceonly) - [ **Google Calendar to OnceOnly** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-onceonly) Questions ## SendGrid and OnceOnly, answered ### ### What can start an automation from SendGrid? Any of SendGrid's 4 triggers in the catalog, including New bounce, New global suppression, New or updated recipient and New suppressed email. Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in OnceOnly when something happens in SendGrid? Any of OnceOnly's 11 actions, including Add event, Add policy, Add tool and Check & Lock. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from OnceOnly to SendGrid? OnceOnly has no triggers in the catalog today, so automations start in SendGrid. If you need the other direction, ask: your agent reads OnceOnly's API documentation and adds it. ### ### Do I have to build a connector for SendGrid or OnceOnly? No. Both are in the catalog with their triggers and actions. You describe the automation; your agent builds it, tests every scenario and keeps it running. ### ### What happens when something fails? Your agent works that out for you. It plans the failure paths along with the happy path, then tests every scenario before it ships. ### ### Is there a free plan? Yes. Every plan includes the agent, including free, and building from your own AI client spends no assistant credits.