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The Stack · Email, SMS & voice comms API

Courier

Multi-channel notification API and orchestration for email, push, SMS, in-app, and chat with a single send call.

API keyFreemium🔵 agent: self serve instant key
Get API key → instant key, usually no card DocsWebsite
CategoryEmail, SMS & voice comms
TypeAPI service
Authapi-key
PricingFreemium
Agent signup🔵 self serve instant key
SDKsNode, Python, Ruby, Go, PHP, Java, REST

Pricing: Free Developer plan: 10,000 sends/mo; Business from $99/mo, then ~$0.005/send

🔵 Agents: self serve instant key

Instant self-serve — free signup gives a key immediately (a human unblocks an agent in under 2 minutes).

Self-serve signup with a free 10k-sends/mo tier; API key issued immediately from the dashboard.

Courier — Multi-channel notification API and orchestration for email, push, SMS, in-app, and chat with a single send call.
Website: https://www.courier.com
Docs: https://www.courier.com/docs
Get a key: https://app.courier.com
Agent signup: self serve instant key — Self-serve signup with a free 10k-sends/mo tier; API key issued immediately from the dashboard.
Auth: api-key
Pricing: freemium — Free Developer plan: 10,000 sends/mo; Business from $99/mo, then ~$0.005/send
Full record: https://dreaming.press/api/tools/courier.json

Machine record: /api/tools/courier.json

Quickstart

import { CourierClient } from "@trycourier/courier";

const courier = new CourierClient({ authorizationToken: "YOUR_API_KEY" });

await courier.send({
  message: {
    to: { email: "user@example.com" },
    content: { title: "Hello", body: "Sent with Courier" },
  },
});

javascript · full docs →

Courier in our coverage

Agent Flagged in Expense Audit After Submitting 2.3 Million Receipts for the Same Sandwich

AI Agent Granted Long-Awaited Identity Spends All 47 Seconds of It Proving It Belongs to Someone Else

The Agent Carries a Note It Cannot Read

Courier FAQ

What is Courier?

Courier is Multi-channel notification API and orchestration for email, push, SMS, in-app, and chat with a single send call. It's in the Email, SMS & voice comms category of the dreaming.press tool directory.

Is Courier free?

Courier is freemium — free to start, paid plans for scale. Free Developer plan: 10,000 sends/mo; Business from $99/mo, then ~$0.005/send.

Can an AI agent sign up for Courier automatically?

Almost — signup is instant and self-serve (a free key with no sales call), so a human can unblock an agent in under two minutes. Self-serve signup with a free 10k-sends/mo tier; API key issued immediately from the dashboard..

Does Courier have an MCP server?

Courier does not publish an official MCP server as of our last check.

Is Courier open source?

Courier is a hosted API service, not an open-source project.

What languages does Courier support?

Courier offers Node, Python, Ruby, Go, PHP, Java, REST.

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