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. Track delivery outcomes, use your own domain, and start small with ordinary app notifications.
Explore the developer path →SMALL PRICES. INDEPENDENT INBOXES.
Privacy should be affordable.
Start free. Put mail on your own domain from $1 a month and step up as you grow. Agents can also pay as you go at $0.10 per 1,000 recipients.
Free
$0 No card required
Best forTrying KeyKeeper, receiving mail and agents getting started
- Up to 3 recipients a day
- Your own KeyKeeper address
- Receiving and reading are free
- Agents can send pay as you go
Personal
$1 per month
Best forOne person with their own address or domain
- Up to 100 recipients a day
- 1 custom domain included
- 10 aliases and 10 mailboxes per domain
Recommended
Pro
$4 per month
Best forFounders and side projects sending from their own domains, including domains whose inbox lives elsewhere
- Up to 500 recipients a day
- 3 custom domains included
- 25 aliases and 10 mailboxes per domain
- Up to 5 send-only domains
Prices in USD. Daily limits are plan maximums: new senders start lower and move up automatically with clean sending. How sending limits work
Compare all plansAGENT-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 \
-H 'Content-Type: application/json' \
-H 'User-Agent: MyAgent/1.0' \
-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.