The same faucet is now available at
It pays most of the time just the minimal increment of sats (vsize). Sometimes it even shows on Mempool.space like if the new sat/vB fee-rate was just 0.9 more than previous.
TRUC was originally used to helpswith getting into block cleanly without any possibility of lowering the overall fee-rate by CPFP (or rather “CSFP” for Child Steals From Parent?). Back to using V2 transactions now (March 2025) where a chain of 25 is in the mempool and replacements are done on its last leaf.
The requests stay between blocks until they are served as they are just miniature files containing the tx_out.script length followed bt tx_out.script in hex encoded as ASCII - example for tb1pfees9rn5nz (LN anchor on testnets) is 04 51024e73. This LN anchor address is always available to test the faucet with only 1-per-block limit in addition to the always-present 240 sats big output. Beware that whatever comes to that address can be spent by anyone and it is very easy to setup a read-only and blank Bitcoin Core wallet, import the descriptor just by address, set a walletnotify script and then just “wait for the mouse”.
I was dreaming about such a faucet since 2018 when I started learning about Bitcoin. Thanks to Kalewoof and @ajtowns for ideas and signet coins!
Environment details
The two HTML files are static (i.e. there is no possibility of 502 Errors or likes, which was the reason I started working on this faucet in November 2021) and served by Caddy2 webserver which gets proxied by Cloudflare. It all runs from home on a 50/10 Mbps fiber optic line (the cheapest available at my place - only 12.90 EUR per month). All (including the main OpenWRT router) is Linux and the faucet extensively uses the tmpfs (i.e. writing temporary files which reside in RAM). All runs on a recycled Mac Book Pro '12 which I bought myself in BestBuy near San Mateo (California).
I get a new IPv4 (only) address upon restarting the fiber optic Huawei device. Soon after a regular script notices the DNS record gets updated with the current IPv4 address and everything works.
I run three Bitcoin Core nodes here. One on the main server (the MacBook), one on the laptop I write this from (which also runs some Elements Core nodes, i.e. Blockstream Liquid) and one in Termux running on latest and unrooted Motorola edge 2022 that I got for free from a friend. All pruned but with current mempool synced sometimes also with mempool.space/api over HTTPS. They produce a sound of wooden block when a new block on mainnet gets verified (blocknotify=script in bitcoin.conf). The same sound as here.
Thank you for reading this far.