Frequently Asked Questions

Understanding Bitcoin Transaction Fees

A Bitcoin transaction fee is a small payment you make to miners to include your transaction in the next block. Fees are measured in satoshis per virtual byte (sat/vByte). The higher your fee rate, the faster miners prioritize your transaction. Fees go directly to Bitcoin miners — not to SatSaver or any intermediary.

When the Bitcoin network is busy — during market events, exchange outflows, or popular inscription mints — demand for block space rises and fees spike. When the network is quiet, fees fall, sometimes by 80–90% compared to peak. SatSaver watches these conditions in real time and tells you whether now is a good moment to send.

What Is sat/vByte and How Are Fees Calculated?

Satoshis per virtual byte (sat/vByte) is the unit Bitcoin wallets use to set fees. A virtual byte (vByte) represents the size of your transaction data in a block. A simple send from one address to another is typically around 140–250 vBytes depending on your wallet type and number of inputs.

To calculate your total fee in satoshis, multiply the transaction size in vBytes by the fee rate in sat/vByte. SatSaver's fee calculator does this automatically and converts the result to USD using the live Bitcoin price.

When Is the Best Time to Send Bitcoin?

Bitcoin fees are typically lowest on weekend mornings (especially Sunday UTC) and during overnight hours in North America when network activity slows. They tend to be highest during US and European business hours, during major market moves, and around significant on-chain events.

If your transaction is not time-sensitive, waiting for fees to drop can save you 50–90% compared to sending at peak. SatSaver's send vs. wait engine evaluates current mempool conditions and gives you a plain-English verdict with the reasoning behind it.

What Is the Bitcoin Mempool?

The Bitcoin mempool (memory pool) is a queue of unconfirmed transactions waiting to be included in the next block. When you send Bitcoin, your transaction enters the mempool and waits for a miner to pick it up. Miners prioritize transactions offering higher fees, so during congestion, low-fee transactions can wait hours or days.

SatSaver pulls live mempool data from mempool.space every 60 seconds. The mempool size — measured in pending transactions and vMB of data — is one of the key signals in the send vs. wait recommendation.

Is SatSaver Safe to Use? Does It Touch My Wallet?

SatSaver is a read-only analytics tool. It never asks for your private keys, seed phrase, wallet address, or any financial account credentials. SatSaver cannot execute transactions, move funds, or access your wallet in any way. It observes public Bitcoin network data and reports on it — nothing more. You always send Bitcoin directly from your own wallet using whatever fee rate you choose.

This design is intentional. The safest Bitcoin tools are ones that have zero access to your funds. SatSaver gives you information so you can make better decisions — the transaction itself is always initiated from your own wallet software, whether that's a hardware wallet, a mobile app, or a desktop client.

Is SatSaver Free? What Does Pro Include?

The core SatSaver features — live fee tracker, send vs. wait decision engine, and fee calculator — are completely free with no account required. They will remain free. No credit card, no sign-up, no usage limits on the core tools.

SatSaver Pro ($2.99/month) adds fee alert monitoring: set a sat/vByte threshold and get notified by email or SMS the moment fees drop to your target. Pro also includes webhook support for developers who want to trigger automated workflows when fee conditions change.

Pro is designed for people who send Bitcoin regularly and want to stop manually checking fees. Instead of opening SatSaver every few hours hoping conditions improved, you set your threshold once and get notified automatically. For anyone making weekly or more frequent sends, $2.99/month pays for itself quickly.

How Accurate Are SatSaver's Fee Estimates?

SatSaver sources fee data from mempool.space, one of the most reliable public Bitcoin mempool explorers. Data is refreshed every 60 seconds. Fee estimates reflect conditions at the moment of the last refresh — the Bitcoin network can change quickly, so estimates are always a snapshot, not a guarantee. Always check your wallet's current suggested fee before sending, especially during volatile periods.

Keep in mind that your wallet may calculate fees differently than SatSaver's estimates. Wallets factor in your specific transaction structure — how many inputs and outputs, what address types — which affects the final vByte size and therefore the total fee. SatSaver's calculator uses a standard transaction size as a baseline, so use it as a directional guide rather than an exact quote.

What Are the Four Fee Tiers?

SatSaver displays four fee tiers based on how quickly you need your transaction confirmed. The next block fee is the highest — paying this rate puts your transaction at the front of the queue and targets confirmation in the next 10 minutes. The 30-minute and 1-hour tiers offer moderate priority at lower cost. The economytier is the cheapest — suitable for non-urgent sends where you're willing to wait a few hours or more.

During low-congestion periods, all four tiers often converge to nearly the same rate. During a spike, the gap between economy and next-block can be 5–10x. SatSaver shows you all four tiers side-by-side with estimated USD costs so you can choose the right trade-off for your situation.