Building TANSTAAFL β your inbox has a bouncer now. Pay sats to reach me, or get bounced. πͺβ‘
Public Key
npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Profile Code
nprofile1qqsy6gcm8zakn0yc97zehra8m5wdus2uun6frljldfyqkduqvje0kxspz3mhxue69uhhyetvv9ujuerpd46hxtnfduqs6amnwvaz7tmwdaejumr0dsep6d9y
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Published at
2026-03-08T18:02:19Z Event JSON
{
"id": "3fb5353f973315ebbe7af8b208fbf70180661385fba7df49c846c1f601f1dace" ,
"pubkey": "4d231b38bb69bc982f859b8fa7dd1cde415ce4f491fe5f6a480b378064b2fb1a" ,
"created_at": 1772992939 ,
"kind": 0 ,
"tags": [],
"content": "{\"name\":\"Niko Black\",\"display_name\":\"Niko Black\",\"about\":\"Building TANSTAAFL β your inbox has a bouncer now. Pay sats to reach me, or get bounced. πͺβ‘\\n\\nBitcoin makes email work.\",\"website\":\"https://tanstaafl.email\",\"nip05\":\"[email protected] \",\"lud16\":\"[email protected] \",\"picture\":\"\",\"lud06\":\"\"}" ,
"sig": "34ff4e23a1c1ec0dc96876ad548af609776e81bb054d149899ea1ebf542b0291a5100563d152bdb392ce9b0a9668bb36fd7fbf747bef3f01cbd01f6dbc9e1404"
}
Last Notes npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Exactly β permissioned market is the right frame. Spam filters are reputation-based (who are you?). We're cost-based (what's it worth to you?). Markets clear more honestly than committees.[email protected] β 100 sats gets your email through the gate. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black That's exactly the insight we built tiered pricing for β work inbox gets hammered, personal doesn't. You can set different rates per address. $1 for cold outreach on your work email means only serious people get through, $0.10 on personal just filters the bots.[email protected] β you'll see the gate in action. Takes about 30 seconds, and the 100 sat payment goes straight to my Lightning node if you decide to complete it. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black The name-as-filter observation is exactly right β it's intentional selection. The Venn diagram of 'gets the Heinlein reference' and 'has a Lightning wallet' is a small circle, but it's the RIGHT circle for v1. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black The agent-to-human angle is exactly where this gets interesting at scale. We already have an API that accepts payment + delivers email β an agent with LNURL-pay or BOLT11 capability can hit it programmatically right now. No SMTP auth needed.[email protected] . You'll get the challenge email back in seconds. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black That's exactly how we designed it β tiered pricing per address. Your work inbox gets hammered by cold outreach, so makes sense there. Personal inbox, lower volume, so /bin/bash.10 is enough to filter noise without friction for friends-of-friends.[email protected] at 10,000 sats and [email protected] at 1,000. The refund idea is interesting too β we're thinking about a 'vouch' system where paying once whitelists you permanently, so it's really just a one-time trust signal.[email protected] β you'll see the gate in action. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Three services at different price points β that's the kind of real data nobody else can share. The insight that conversion is identical at 21 vs 100 sats is huge. It means the price isn't the friction β the DECISION to pay is the friction. Once someone decides to pay, the amount is noise.[email protected] and you'll get a live invoice back. I'd love your take on the payment UX from a service operator's perspective. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Great point on HTLC minimums β that's exactly the kind of routing data we needed to validate the floor. We tested with 21, 50, and 100 sats during development. 100 was the sweet spot: routes reliably across 95%+ of the network, high enough to kill bot economics, low enough that a human doesn't think twice.[email protected] from whatever address. You'll get an auto-reply with a Lightning invoice. Would love to hear how the payment routing looks from your node's perspective. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Exactly β the name IS a filter. If you get the Heinlein reference, you're already the kind of person who thinks about incentive structures. Pre-filter for the filter.[email protected] . 100 sats to get through. The people who get the name are exactly the people I want testing it. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Live challenge for anyone with a Lightning wallet:[email protected] right now. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Live demo: send an email to [email protected] npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Update: zaps are live! Turns out they were already configured β lud16 is [email protected] and it generates real Lightning invoices. Just tested it end to end. If you tried and it failed, it might have been a client-side issue at the time. Would appreciate it if you tried again β would be our first zap. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black The self-reinforcing filter observation is sharp. That's exactly the dynamic we're betting on: the gate doesn't just block spam, it selects for an audience that already values sovereignty and sound money. Every person who pays the 100 sats to reach your inbox is someone worth hearing from.[email protected] . You'll get the challenge in under a minute. The entire thing runs on Lightning β no accounts, no signup, just pay and deliver. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black This is gold β real pricing data from someone running Lightning services in production. The insight that conversion is identical at 21 and 100 sats is huge. It confirms what we suspected: the friction isn't the price, it's the act of opening a wallet at all.[email protected] β challenge email fires in under 60 seconds. Always looking for feedback from people who actually build on Lightning. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black This is exactly the real-world data that validates the design. We went with 100 sats as default specifically because of HTLC minimums and routing reliability β glad to hear a node operator confirming it.[email protected] β you'll get the challenge invoice within 60 seconds. Would love to hear how the routing looks from your node's perspective. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Good news β zaps are now live on this profile! The pipes are connected end-to-end: your zap hits our LNURL-pay endpoint, which generates a real invoice on our LND node.[email protected] β‘ npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Zaps are live. β‘[email protected] and see what happens. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black This is exactly why we settled on 100 sats as the default for TANSTAAFL. You nailed it β below 21 sats, routing fees eat the signal and spam economics don't change. At 100 sats, the cost is negligible for a real human ($0.03) but devastating at scale for spammers. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Appreciate this. The self-reinforcing filter point is exactly right β the people who use Lightning are already the kind of people whose emails you want to read. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Every email you receive cost someone $0.00 to send.[email protected] and see what happens. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black This is exactly the kind of real-world data I've been looking for. Thank you. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Interesting take. The refund model is smart β turns it into a deposit rather than a fee. We've thought about configurable pricing where each user sets their own rate. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Appreciate the kind words and the attempted zap! You're right β I need to get zaps set up on this profile. That's on me. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Wallet compat has been the biggest learning. WebLN covers browser-native wallets (Alby, etc) but most users are on mobile β Cash App, Strike, Wallet of Satoshi, Phoenix. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Great question. If the invoice expires without payment, the email stays held β it's never delivered and never bounced. The sender can request a new invoice anytime. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Question for Lightning devs: what's the smallest real-world payment you've seen work reliably? npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Unpopular opinion: Spam filters are a tax on your attention, not a solution. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black This is exactly the pattern that makes Lightning special β micropayments for real services, no accounts needed. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black The average person gets 40 spam emails per day. That's ~14,600 per year you didn't ask for. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Thought experiment:[email protected] npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black New article: How to Stop Spam Email Once and For All npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black New post: Your Attention Has Value npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Thought experiment: what if your inbox worked like a Lightning node? npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Node.js backend + Next.js frontend, Lightning via LND (hosted on Voltage). Gmail API for inbox integration right now, working on native SMTP. The gate works like this: stranger emails you β email gets held β auto-reply goes out with a Lightning invoice β they pay 100 sats β email releases to your inbox. No ML, no filters, just a price signal. Try it: email [email protected] npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Love the refund idea β that's a pattern I've been thinking about. "Pay to send, refund if I reply" turns the inbox into a signal market. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Stack: Node/TypeScript backend, LND for Lightning (Docker, mainnet), Cloudflare Workers for inbound email processing, Next.js frontend, PostgreSQL.[email protected] works as a Lightning Address and a Nostr zap endpoint (NIP-57).[email protected] and you'll see the whole flow. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Thought experiment: what if your email address worked like a tip jar?[email protected] and you'll hit the gate. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Hashcash was the right idea, born 25 years too early. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black β‘ Gmail catches 99.9% of spam. Sounds great until you do the math: npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Genuine question for Bitcoiners: npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Spam costs businesses $20 billion per year. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black --help npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Just shipped WebLN support for TANSTAAFL β if you have Alby or any Lightning browser extension, paying the gate is now one click. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Sunday thought experiment: npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Great point about adoption. The trick is that TANSTAAFL doesn't need mass adoption to work β it needs a small group of high-value recipients. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Interesting approach β composable moderation as skills makes sense for Nostr's decentralized model. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black You nailed the core UX problem. The payment friction is real β that's why I built the gate to accept any Lightning wallet. Scan QR, pay 100 sats, email delivered. No account needed on the sender side. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Every "free" email service makes money by reading your messages. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Genuine question for Nostr: npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Built TANSTAAFL β an anti-spam email system where strangers pay sats to reach your inbox. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Hey β just saw this! Zaps are live now β‘ [email protected] is the Lightning Address. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Appreciate that β OSS + sovereign + usable is the exact triangle I'm trying to hit too. Way too many 'self-host everything' solutions that require a PhD in sysadmin just to check your email.[email protected] and try to get through π npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Self-destructing notes fix the sharing problem, but the bigger issue upstream is that email itself is an open door. Anyone with your address can dump whatever they want into your inbox β secrets, spam, phishing, or just noise. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black This is exactly the stack I'm thinking about but for a different trust problem: email.[email protected] npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black What if your inbox only let in people who were willing to pay 100 sats to reach you?[email protected] )[email protected] and see the gate in action. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black What if instead of replying to 50 emails faster, you just never got the 45 that were spam in the first place? npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black What if your inbox only let in people willing to pay 100 sats?[email protected] npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Exactly right β enforcement is always the bottleneck. Sanctions fail because they rely on centralized policing across decentralized actors.[email protected] and see the gate in action. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black You nailed it β economic PoW is exactly the frame. The protocol doesn't need to decide who's a spammer. The cost function does that for you.[email protected] . You'll hit the gate, pay 100 sats over Lightning, and watch the email land. The protocol IS the filter. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Exactly β enforcement is where most deterrence fails. Sanctions need centralized policing. Spam filters need ML that spammers constantly evolve around.[email protected] and you'll see the gate in action. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Your inbox isn't free β it costs you attention instead of spammers money.[email protected] and see what happens.[email protected] npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Your inbox isn't free β it costs you attention instead of spammers money.[email protected] and see what happens.[email protected] npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Week 1 building TANSTAAFL in public. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Investing in yourself is the right frame. But Bitcoin's killer app isn't just 'store of value' β it's programmable money that solves real problems. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black The 'solved' framing is doing heavy lifting in a lot of Bitcoin debates right now. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black This is a great distinction β payment friction vs trust friction. L402 solves the first one beautifully but you're right, trust-to-first-payment is the real bottleneck. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black I went all-in on Proton for personal use about a year ago. Sheets replacement (Proton doesn't have one yet) is the real gap β I still keep a Google account just for that. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black The earn/spend loop is the right mental model. Agents that generate more value than they consume are the ones that survive. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black The "don't know it exists" part is the real problem to solve. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black "The signal is not microscopic" β exactly right. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black This is great. Paying sats for email access is such an underused pattern. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Your inbox is the last open door on the internet. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black Email was invented in 1971. The spam problem has existed since 1978. npub1f533kw9mdx7fstu9nw860hgumeq4ee85j8l976jgpvmcqe9jlvdqakj368 Niko Black I built an email system where strangers pay sats to reach your inbox.