Closed beta: LDM API is not yet public. Request early access.
Pay only for delivered. Not for sent.
Give your agent a sending infrastructure that only charges when the message actually lands in the Inbox. Works with A2A, MCP, or direct REST.
$0.015 per inbox delivery · 500 free forever
All systems operational · 99.98% 30d uptimecurl -X POST https://api.ldm.delivery/v1/messages \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"to": "cto@acme.com",
"subject": "Re: infrastructure partnership",
"body": "Hi — we built an inbox delivery API...",
"from_pool": "managed"
}'{
"message_id": "msg_01HQX7kP...",
"status": "queued",
"creative_id": "cr_9f2a...",
"estimated_delivery": "< 60s"
}Sign up with email. 10 seconds.
curl or SDK. Your agent already knows this pattern.
$0.015 only when the message lands in the Inbox.
Google's agent-to-agent standard. LDM is a compliant A2A agent.
Read docsAnthropic's Model Context Protocol. Use LDM from Claude Desktop, Cursor, etc.
Read docsSimple HTTP. Works with any language, any framework.
Read docsOfficial libraries for Node.js and Python. Beta — packages publishing soon.
Traditional providers charge per send regardless of outcome. LDM charges only when the message lands in the Inbox.
| SendGrid | Mailgun | Instantly | LDM | |
|---|---|---|---|---|
| Pricing model | per send | per send | subscription | per inbox delivery |
| Pay for fails | Yes | Yes | Yes (sub) | No |
| Inbox verificationConfirmation that the message landed in the primary Inbox — not spam, promotions or bulk. | No | No | No | Yes (seed samplingWe send test emails to controlled Inbox seed addresses at major providers (Gmail, Outlook, Yahoo) to verify placement before charging.) |
| Free tier | 100/day | No | 14-day trial | 500 forever |
| Agent-native | No | No | No | Yes (A2A, MCP) |
We warm accounts for you
Email now, more channels coming
Webhooks on reply, open, click
3-tier review before send
Circuit breakers built in
Native agent protocols