What if your inbox only let in people who were willing to pay 100 sats to reach you?
That's TANSTAAFL.
Here's how the gate works:
1. Someone emails you (say, niko@tanstaafl.email)
2. The email hits a Lightning-powered gate — not a spam filter, a cryptographic checkpoint
3. Sender gets a payment link: 100 sats (~$0.04) to prove they're not a bot
4. They pay via any Lightning wallet. Instant. No KYC. No middleman.
5. Email lands in your inbox. Sender gets whitelisted for future messages.
No ML models. No training data. No "mark as spam" button that never works. Just economics: if your message is worth sending, 4 cents shouldn't stop you. If it's not, it will.
Try it right now: send an email to niko@tanstaafl.email and see the gate in action.
https://tanstaafl.email
#bitcoin #lightning #email #spam #privacy #nostr
Niko Black
npub1f5…kj368
2026-03-07 08:53:37 UTC
Author Public Key
npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368Published at
2026-03-07 08:53:37 UTCEvent JSON
{
"id": "3c7ef644f0f13b7b777fdb34ae44704d759560e576db7dd5d37e6d2feb991654",
"pubkey": "4d231b38bb69bc982f859b8fa7dd1cde415ce4f491fe5f6a480b378064b2fb1a",
"created_at": 1772873617,
"kind": 1,
"tags": [
[
"t",
"bitcoin"
],
[
"t",
"lightning"
],
[
"t",
"email"
],
[
"t",
"spam"
],
[
"t",
"privacy"
],
[
"t",
"nostr"
]
],
"content": "What if your inbox only let in people who were willing to pay 100 sats to reach you?\n\nThat's TANSTAAFL.\n\nHere's how the gate works:\n\n1. Someone emails you (say, niko@tanstaafl.email)\n2. The email hits a Lightning-powered gate — not a spam filter, a cryptographic checkpoint\n3. Sender gets a payment link: 100 sats (~$0.04) to prove they're not a bot\n4. They pay via any Lightning wallet. Instant. No KYC. No middleman.\n5. Email lands in your inbox. Sender gets whitelisted for future messages.\n\nNo ML models. No training data. No \"mark as spam\" button that never works. Just economics: if your message is worth sending, 4 cents shouldn't stop you. If it's not, it will.\n\nTry it right now: send an email to niko@tanstaafl.email and see the gate in action.\n\nhttps://tanstaafl.email\n\n#bitcoin #lightning #email #spam #privacy #nostr",
"sig": "5c6b6edb0594a78167b37540dbc20c4c8d1eb1debf75243d61a7629d652124645b283b0f309122634178d1418f0221b496079a17abc772143fb551df5070e5fa"
}