Stop Overpaying Bitcoin Fees
Real-time mempool data. A plain-English answer on whether to send now or wait.
24-hour fee trend
How the network fee rate has moved over the last day.
Could you save by waiting?
A quick read on whether holding off is worth it right now.
Fee Calculator
Pick a speed - see exactly what you'll pay and how much you'd save going slower.
What is sat/vByte?
Satoshis per virtual byte - the unit for Bitcoin fees. Miners pick the highest-paying transactions first. Higher rate = faster confirmation.
What is a vByte?
Virtual bytes measure transaction weight. Simple sends ~140 vB. Multi-input transactions 500+ vB. SegWit and Taproot reduce size significantly.
When do fees spike?
When too many transactions compete for the same block space. Halving events, Ordinal mints, and volatile markets cause surges. Fees drop on weekends and overnight.
Data via mempool.space - Disclaimer
How SatSaver Works
Raw mempool data → simple decision. No technical knowledge required.
We check the mempool
SatSaver fetches live fee data from the Bitcoin mempool - the waiting room for unconfirmed transactions. Updated every 60 seconds.
We run the numbers
Our decision engine compares current fees against historical patterns to determine if now is a good, bad, or neutral time to send.
You get a clear answer
Send now, wait, or borderline - with a plain-English explanation and a savings estimate. No raw data, no guesswork.
You keep more sats
By timing your transaction, you pay lower fees. Those sats stay in your wallet - not the miners'.
Bitcoin fees, in plain English
Everything you need to make a confident send-or-wait decision.
What is sat/vByte?
It's the price of Bitcoin block space. A satoshi (sat) is the smallest unit of Bitcoin, and a vByte is a unit of transaction size. So sat/vByte is simply how many sats you pay per unit of size — the higher the rate, the faster miners include your transaction.
What is a vByte?
A virtual byte (vByte) measures how much block space your transaction takes up. A simple send is around 140 vBytes; transactions with more inputs are larger. Your total fee is your fee rate (sat/vByte) multiplied by your size (vBytes).
Why do Bitcoin fees change?
Each block only fits so many transactions. When lots of people send at once, they bid higher fees to get in first, so rates rise. When the network is quiet, fees fall. SatSaver reads this demand live from the mempool.
When should I wait?
If your transaction isn't urgent and fees are elevated, waiting often pays off — rates frequently drop overnight and on weekends. SatSaver tells you when conditions are expensive so you can hold off.
When should I send immediately?
Send now when fees are low, or when the transaction is time-sensitive regardless of cost. When SatSaver says it's a great time to send, the network is cheap and you're unlikely to do better by waiting.
Does SatSaver touch my Bitcoin?
No. SatSaver never connects to your wallet, never asks for keys or seed phrases, and never signs or broadcasts transactions. It only reads public network data and gives you guidance. You stay in full control of your funds.
Automate Your Savings
Free already saves you money. Pro automates it — live fee-drop alerts today, with savings tracking and trend tools rolling out soon.
Fee Drop Alerts
Email alert when fees drop below your target sat/vByte threshold.
SMS & Webhook Alerts
Get fee-drop alerts by SMS or piped to your own tools via webhook.
Savings Tracker
Running total of sats and USD saved by timing your transactions.
7-Day / 30-Day Trends
Historical fee charts to find the best windows by hour and day.
Best Send Window
Forecast of when fees will next dip based on historical patterns.
No Ads
Completely ad-free experience across all devices.
Get SatSaver Pro
$2.99/month · Cancel anytime · No hidden fees
Quick sign-in required · Secure checkout via Stripe
Never Overpay Again
Set a target fee. We check the mempool every 2 minutes and email you the moment fees drop below your threshold.
Now You Know When — Here's How to Send
SatSaver tells you the right moment. These tools let you act on it — with full fee control, non-custodial storage, and no middlemen.
ⓘ Links above are affiliate links. SatSaver earns a small commission if you sign up — at no extra cost to you. Commissions fund free tools. Full disclosure
Recommended Gear & Reading
Hand-picked tools and books to take real control of your Bitcoin — and the fees you pay.
Inventing Bitcoin
A short, plain-English walkthrough of how Bitcoin works. The easiest starting point for beginners.
View on AmazonThe Bitcoin Standard
The 'why' of Bitcoin — money, history, and sound economics. The modern classic.
View on AmazonMastering Bitcoin (3rd Ed.)
The technical deep-dive into how Bitcoin works under the hood. For developers and power users.
View on AmazonTop pickTrezor Safe 3
Secure-element hardware wallet that lets you set your own sat/vByte fee on every transaction.
View on AmazonTrezor Model One
The original budget-friendly cold-storage wallet — full custom fee control included.
View on AmazonCryptosteel Capsule
Fireproof, waterproof steel backup for your 24-word seed phrase. No cloud, no electronics.
View on Amazonⓘ As an Amazon Associate, SatSaver earns from qualifying purchases — at no extra cost to you. Commissions help keep the core tools free. Full disclosure