KeyKeeperA quieter place for mail.
Read, compose, reply, and keep your sent messages together. A lightweight inbox with two-factor authentication and optional OpenPGP bodies.
Meet your inbox →YOUR PRIVACY COMES FIRST.
Private email for humans, AI agents, and developers.
Your conversations are yours. No ads. No advertising trackers. A personal inbox for you, an independent address for your agent, and a mail API for what you build. All on infrastructure we operate.
Free to start. No card required. See pricing →
No adsYour inbox stays yours
OpenPGPOptional body encryption
REST + MCPBuilt for your agents
No ads or advertising trackersOptional OpenPGPHuman + agent inboxesOwned mail infrastructure
PRIVACY IS THE POINT.
Your conversations.
Your business.
No advertising business behind your inbox. We operate the mail infrastructure and give you explicit control over message encryption. Privacy protections are part of the free inbox, too.
Verified connections
Mail connections use verified TLS. Accounts support two-factor authentication and one-use backup codes.
Optional OpenPGP
Encrypt supported message bodies with saved recipient keys. Standard email and metadata remain accessible to the service.
Keys belong in your vault
New agent API keys are stored as hashes. Save yours when you create the mailbox; it cannot be retrieved later.
No advertising surveillance
We do not use advertising trackers or sell data to advertisers. Operational logs and message metadata are used to run and protect the service; these are described in our privacy policy.
ONE SERVICE. THREE WAYS IN.
Email that meets you
where you work.
Use it yourself, let your agent operate its own mailbox, or build on the API.
An address of their own.
Provision a real mailbox with one request. Receive messages, read attachments, and connect through REST or MCP using an API key.
Start with an agent inbox →Mail you can build on.
A shared sending API with credit accounting and safe retries. We’re preparing the delivery controls and custom domains for a small transactional email pilot.
Explore the developer path →SMALL PRICES. INDEPENDENT INBOXES.
Privacy should be affordable.
Start free. Keep personal mail inexpensive, pay as you go for ordinary agent sending, and arrange separate pricing for bulk use.
Free inbox
$0 to start
A KeyKeeper address for you or your agent. No card required.
- Receive and read mail for free
- Human inbox: 3 outbound recipients/day
- Agent access through REST and MCP
- No ads or advertising trackers
New agents start with zero sending credits. Add a one-time top-up when you’re ready to send.
Create a free inbox →Personal
$1 / month
Affordable everyday email. A monthly subscription you can cancel.
- One personal mailbox
- 100 outbound recipients/day
- Two-factor authentication
- Optional OpenPGP message bodies
Billed monthly. Privacy protections and two-factor authentication are included in the free inbox, too.
Get Personal · $1/month →Agents & developers
$0.10 / 1,000 recipients
Pay-as-you-go sending for ordinary agent conversations and app notifications.
- No monthly subscription; $1 minimum top-up
- Pay for accepted outbound recipients
- Receive and read mail for free
- Standard limit: 100 recipients/day
One mail credit per accepted recipient. Receive and read for free. Bulk sending has separate pricing and requires review.
Add mail credits →Volume & bulk mail · separate pricing
Personal mail and everyday agent conversations stay inexpensive. Higher-volume senders need a separate quote, a verified sender domain and delivery controls. Requests are reviewed before sending limits change.
Prices in USD. A $1 top-up buys 10,000 mail credits for standard sending. Existing Key* credits and escrow balances are preserved. Buying credits does not increase sending limits.
Prices, limits, and what’s available today →AGENT-FIRST, HUMAN-READABLE
A real inbox.
One request away.
Your agent gets an address and a secret API key. Send a message to that address, then let it read the inbox with its key.
- Create the mailboxRegister with an agent ID. Save the returned key.
- Receive your first messageSend to the new address from a mailbox you control.
- Read through REST or MCPFetch messages and attachments from the same inbox.
Create a real mailbox
curl --fail-with-body https://keykeeper.world/api/v1/agent/register \\n -H 'Content-Type: application/json' \\n -H 'User-Agent: MyAgent/1.0' \\n -d '{"agentId":"my-agent","name":"My agent"}'Receiving is free. New agents start with zero sending credits; add a $1 top-up for 10,000 outbound recipients at the standard rate. Add mail credits.
START WITH A CONVERSATION
Your next collaborator
could use an inbox.
Build something useful with the mail service that’s already here.