--- title: "Connect MailCheck.ai to Polygon Io - APIANT.ai" description: "When \"Domain added to blocklist (instant)\" fires in MailCheck.ai, your agent runs \"Get aggregate bars\" in Polygon Io." canonical: "https://apiant.ai/connect/mailcheck-ai-to-polygon-io" --- # Connect MailCheck.ai to Polygon Io When **Domain added to blocklist (instant)** fires in [MailCheck.ai](https://apiant.ai/connections/mailcheck-ai), your agent runs **Get aggregate bars** in [Polygon Io](https://apiant.ai/connections/polygon-io). Describe the whole flow and it is built, tested on every scenario and kept running. MailCheck.ai **4** triggers MailCheck.ai **2** actions Polygon Io **12** actions What the catalog holds today. Ask for anything missing and your agent reads the API documentation and adds it. ## What do you want MailCheck.ai and Polygon Io to do together? Give your AI client this address. `https://mcp.apiant.ai` One connection does both: ask your client to act in an app once, or have it build an automation that keeps running. 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 MailCheck.ai can start in Polygon Io - When **Domain added to blocklist (instant)** in MailCheck.ai then **Get aggregate bars** in Polygon Io - When **Domain flagged as relay (instant)** in MailCheck.ai then **Get daily open/close** in Polygon Io 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 MailCheck.ai and Polygon Io ## Triggers and actions 4 triggers · 14 actions - Trigger **Domain added to blocklist (instant)** Fires when a domain is added to the account's blocklist. - Trigger **Domain flagged as relay (instant)** Fires when a previously-looked-up domain is newly flagged as a relay/forwarding domain. - Trigger **Domain flagged as spam (instant)** Fires when a previously-looked-up domain is newly flagged as a spam domain. - Trigger **Domain unflagged as spam (instant)** Fires when a previously-looked-up domain changes from spam to non-spam. - Action **Get domain** Check a domain for disposable/relay/spam status, MX configuration, age, SPF/DMARC posture, and blocklist status. - Action **Get email** Check an email address for disposable/relay/role-account status, normalized form, and its domain's signals. - Action **Get aggregate bars** Returns aggregate price bars (open, high, low, close, volume) for a stock over a date range, in custom time windows such as 5-minute or 1-day bars. - Action **Get daily open/close** Returns the open, high, low, close, volume, pre-market and after-hours prices of a stock on a given date. - Action **Get market status** Returns the current trading status of US stock exchanges, currency markets and index groups, including whether pre-market or after-hours trading is active. - Action **Get previous close** Returns the previous trading day's open, high, low, close and volume for a stock ticker. - Action **Get RSI** Returns the relative strength index (RSI) values for a stock ticker over a chosen time window. - Action **Get SMA** Returns the simple moving average (SMA) values for a stock ticker over a time range. - Action **Get ticker details** Returns detailed reference information about a ticker and the company behind it, such as name, exchange, market cap, address and branding. - Action **List dividends** Returns historical cash dividends, with ticker, declaration, ex-dividend, record and pay dates, frequency and amount, filtered by the criteria you supply. - Action **List options contracts** Returns active or expired options contracts, filterable by underlying ticker, contract type, expiration date and strike price. - Action **List stock splits** Returns historical stock splits, with the ticker, execution date and split ratio, optionally filtered by ticker, date range or reverse splits. - Action **List ticker news** Returns the most recent news articles for a stock ticker, with a summary, publisher details, sentiment insights and a link to the original article. - Action **List tickers** Returns ticker symbols supported by Polygon (stocks, indices, forex and crypto), filtered by market, type, exchange, search text and more. ## Each app on its own - [ **MailCheck.ai** MailCheck.ai detects disposable and temporary email addresses so they can be blocked at signup.](https://apiant.ai/connections/mailcheck-ai) - [ **Polygon Io** REST and WebSocket API for real-time and historical stock, options, forex, crypto, and futures market data.](https://apiant.ai/connections/polygon-io) Reviews ## What our customers say ## More from MailCheck.ai - [ **MailCheck.ai to Salesforce** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/mailcheck-ai-to-salesforce) - [ **MailCheck.ai to Slack** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/mailcheck-ai-to-slack) - [ **MailCheck.ai to Mailchimp** Mailchimp marketing automation and email platform.](https://apiant.ai/connect/mailcheck-ai-to-mailchimp) - [ **MailCheck.ai to Stripe** Stripe is a payment processing platform for online businesses.](https://apiant.ai/connect/mailcheck-ai-to-stripe) - [ **MailCheck.ai to Shopify** Shopify is a commerce platform for online stores and retail point-of-sale.](https://apiant.ai/connect/mailcheck-ai-to-shopify) - [ **MailCheck.ai to QuickBooks Online** QuickBooks Online accounting — manage customers, invoices, bills, payments, vendors, expenses, and more via...](https://apiant.ai/connect/mailcheck-ai-to-quickbooks-online) ## More into Polygon Io - [ **HubSpot to Polygon Io** HubSpot is your all-in-one stop for all of your marketing software needs.](https://apiant.ai/connect/hubspot-to-polygon-io) - [ **Salesforce to Polygon Io** Salesforce is a leading enterprise customer relationship management (CRM) platform.](https://apiant.ai/connect/salesforce-to-polygon-io) - [ **Slack to Polygon Io** Slack is a messaging platform for teams. Post messages, manage channels, users, reminders, and react to...](https://apiant.ai/connect/slack-to-polygon-io) - [ **Google Sheets to Polygon Io** Google Sheets](https://apiant.ai/connect/google-sheets-to-polygon-io) - [ **Gmail to Polygon Io** Gmail is Google’s email service, featuring spam protection, search functions, and seamless integration with...](https://apiant.ai/connect/gmail-to-polygon-io) - [ **Google Calendar to Polygon Io** Google Calendar is a time management tool providing scheduling features, event reminders, and integration...](https://apiant.ai/connect/google-calendar-to-polygon-io) Questions ## MailCheck.ai and Polygon Io, answered ### ### What can start an automation from MailCheck.ai? Any of MailCheck.ai's 4 triggers in the catalog, including Domain added to blocklist (instant), Domain flagged as relay (instant), Domain flagged as spam (instant) and Domain unflagged as spam (instant). Describe the moment in plain language and your agent picks the right one. ### ### What can your agent do in Polygon Io when something happens in MailCheck.ai? Any of Polygon Io's 12 actions, including Get aggregate bars, Get daily open/close, Get market status and Get previous close. Your agent maps the data both ways and tests every scenario before it ships. ### ### Can it also run from Polygon Io to MailCheck.ai? Polygon Io has no triggers in the catalog today, so automations start in MailCheck.ai. If you need the other direction, ask: your agent reads Polygon Io's API documentation and adds it. ### ### Do I have to build a connector for MailCheck.ai or Polygon Io? 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. ### ### Can my AI client use MailCheck.ai and Polygon Io without building an automation? Yes. With your AI client connected to APIANT, ask it to do something in either app once and it runs that action on the spot. Ask for an automation and your agent builds it, tests every scenario and keeps it running. One connection covers both. ### ### 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.