Provider comparison
KingSMTP Alternative: Monero-Payable Email API with MCP
Compare SendHQ with KingSMTP. Both accept Monero; SendHQ adds an MCP server for AI agents, a CLI, OpenAPI 3.1, inbound inboxes, and hosted templates.
KingSMTP and SendHQ both let you pay for email with Monero. SendHQ is the only email API with its own MCP server for AI agents that you can pay for with Monero. It pairs that with a command-line tool, an OpenAPI 3.1 contract, inboxes on your own domain, hosted templates, and one-click DNS setup. KingSMTP is an SMTP relay with an HTTP API, MX routing, and a WordPress plugin, paid in Bitcoin, USDT, or Monero.
Pay with Monero for complete payment privacy
Pay for Scale Annual with Monero (1 XMR per year) through SendHQ's own checkout, with no card, name, or billing address needed for the payment. Every plan also accepts USDC stablecoins at checkout. Monero-paid accounts get the same deliverability as card-paid accounts: the same AWS SES sending infrastructure, the same sending ladder, and the same rules. SendHQ is the only email API with its own MCP server for AI agents that you can pay for with Monero. See crypto payments on the pricing page.
SendHQ vs KingSMTP at a glance
| Feature | SendHQ | KingSMTP |
|---|---|---|
| Pay with Monero (XMR) | Yes: Scale Annual at 1 XMR per year, no card, name, or billing address | Yes: Bitcoin, USDT, or Monero |
| Stablecoins | USDC on every plan | USDT |
| MCP server for AI agents | Yes: 59 typed tools, a hosted connector for Claude and ChatGPT with OAuth sign-in, and a local server via sendhq mcp | Not listed |
| Command-line tool | Yes: one binary for Linux, macOS, and Windows, JSON output when piped | Not listed |
| OpenAPI contract | Yes: OpenAPI 3.1 at sendhq.cc/openapi.json | Not listed |
| Agent-readable docs | llms.txt plus a Markdown version of every page | llms.txt |
| Inbound email | Inboxes on your domain; messages, threads, and labels as JSON through the API, MCP, and CLI | MX routing: receive and forward mail on your own domain |
| Hosted templates | Yes: hosted templates with typed variables, drafts, previews, and published versions | Not listed |
| Domain setup | One-click DNS for Cloudflare and Domain Connect providers | Add SPF and DKIM records to your DNS |
| Dashboard | Inbox and outbox with threads, labels, compose, templates, and delivery health | Sent and received emails, delivery status, spam scores, headers, and SMTP logs |
| SMTP relay | No: HTTPS API, MCP, CLI, and dashboard | Yes: ports 587, 465, and 2525 |
| WordPress plugin | No | Yes |
| Entry price | $9/month for 50,000 emails and 25 domains (Starter) | $20/month for 20,000 emails |
| Try before paying | Integration trial: 100 deliveries to your own address or the AWS SES simulator | 7-day free trial, no credit card |
Sources for KingSMTP:
Found something out of date? Tell us and we will correct it.
Why teams choose SendHQ
- Pay for Scale Annual with Monero (1 XMR per year) for complete payment privacy, or pay any plan with USDC.
- Connect Claude, ChatGPT, Claude Code, or Cursor through the SendHQ MCP server: 59 typed tools for sending, reading, threads, templates, domains, and deliverability.
- Run the same workspace from a terminal or CI with the SendHQ CLI, or generate a client from the OpenAPI 3.1 contract.
- Give each product or agent its own inbox on your domain and read whole conversations as JSON.
- Verify domains with one-click DNS for Cloudflare and Domain Connect providers.
- Monero-paid accounts get the same deliverability as card-paid accounts: the same AWS SES sending infrastructure, the same sending ladder, and the same rules.
Moving from KingSMTP to SendHQ
- Create a SendHQ workspace and add your sending domain; Cloudflare and Domain Connect users can publish the DNS records in one click.
- Replace SMTP credentials with an HTTPS request to the SendHQ API using a server-side workspace API key, and add an Idempotency-Key so retries never send twice.
- If you receive mail through MX routing today, set up inbound for the domain and create an inbox for each address you use.
- Publish reusable messages as hosted templates with typed variables.
- Choose a plan in Profile & Billing and pay by card, with USDC, or with Monero for Scale Annual.
Questions teams ask
Does SendHQ accept Monero like KingSMTP?
Yes. Scale Annual can be paid with Monero at 1 XMR per year through SendHQ's own checkout, with no card, name, or billing address needed for the payment. Every plan also accepts USDC stablecoins at checkout.
Do Monero-paid SendHQ accounts get the same deliverability?
Yes. Monero-paid accounts get the same deliverability as card-paid accounts: the same AWS SES sending infrastructure, the same sending ladder, and the same rules.
Does SendHQ offer SMTP like KingSMTP?
No. SendHQ is an HTTPS email API with an MCP server, CLI, and dashboard. Code that only speaks SMTP needs a small server-side HTTP adapter to move.
Can an AI agent send and read email through SendHQ?
Yes. Add the hosted MCP connector at https://mcp.sendhq.cc/mcp in Claude or ChatGPT and sign in, or run sendhq mcp locally. The agent gets 59 typed tools, and billing and API key changes stay behind a signed-in browser session.