Mining pool fees explained, and why the headline number lies

Every pool advertises a fee. Miners compare those numbers the way shoppers compare price tags, pick the smallest one and consider the job done. That is a mistake, because the advertised fee is one term in an equation with four or five terms, and the other terms are frequently larger.

To see why, you need to understand what a pool actually sells you.

What a pool is for

Solo, a miner with a small share of network hashrate collects rewards rarely and unpredictably. A pool aggregates hashrate, wins blocks at the collective rate, and splits rewards according to submitted shares. You are not buying hashrate from a pool; your hardware provides that. You are buying variance reduction, and the payout scheme defines exactly how much variance you shed and who carries it instead.

PPS: the pool carries the risk

Under Pay Per Share, the pool pays you a fixed amount for every valid share, calculated from the share difficulty and current block reward, whether or not the pool finds a block that day. Your income becomes almost perfectly smooth. The pool absorbs all the luck.

Insurance is never free. PPS fees run noticeably higher than PPLNS fees, commonly 2 to 4 percent against 0.5 to 1 percent, because the pool must hold reserves to survive unlucky streaks. FPPS and PPS+ variants extend the same idea to transaction fees: the pool pays you a share of expected fee revenue too, priced accordingly.

PPS makes sense when you value predictability: tight electricity margins, a business with payroll, or hosting contracts billed monthly.

PPLNS: you carry the risk

Pay Per Last N Shares pays out only when the pool finds a block, splitting the reward across shares submitted during a recent window. Your income tracks the pool's actual luck. Over months, a PPLNS miner on a decent pool typically earns slightly more than a PPS miner, because nobody is charging an insurance premium. Over any given week, earnings can swing well below expectation.

PPLNS has a subtler property: the rolling window rewards loyalty. If you hop between pools, you leave just as your accumulated shares are about to mature and arrive at the next pool with an empty window. Pool-hopping against PPLNS is a losing strategy by design.

SOLO through a pool

Solo mining via a pool interface means you pay a small fee, often 0.5 to 1 percent, for infrastructure, and if your hashrate finds a block, you keep essentially the whole reward. No block, no payment, ever. For a small miner on a large network this is lottery economics, and it only becomes rational on smaller networks where your hashrate represents a meaningful fraction of the total, or when you knowingly prefer a small chance of a large payout.

The costs that are not in the headline

Here is where fee shopping falls apart. The advertised percentage omits several real costs:

• Payout thresholds and withdrawal fees. A pool with a 1 percent fee, a high minimum payout and a fixed withdrawal charge can cost a small rig far more than a 2 percent pool that pays out daily for free. Coins stuck below a threshold on a pool that later shuts down are a genuine and recurring way miners lose money.
• What the fee is charged on. A percentage of block rewards only is smaller than the same percentage of rewards plus transaction fees. Two pools quoting "1 percent" can differ meaningfully on fee-heavy chains.
• Stale and rejected shares. A poorly connected pool that rejects 2 percent of your shares costs you exactly as much as 2 percent of extra fees, while advertising none of it.
• Luck accounting you cannot audit. On opaque PPLNS pools, persistent below-expectation "luck" is indistinguishable from a hidden margin. Long-term effective earnings per hashrate is the only honest metric.

The correct comparison is total realized income per unit of hashrate over time, not the number on the landing page.

How to actually choose

Estimate your expected daily earnings first with the mining calculator, then work through the short list: payout scheme matching your risk tolerance, effective total cost including thresholds and withdrawals, share rejection rates from your own location, and the pool's share of network hashrate. Then browse candidates on /pools and compare them on those terms.

One closing caution on pool size. The biggest pool usually offers the steadiest PPLNS income, but hashrate concentration is a protocol-level risk for the coin you are mining. Directing hashrate to the second or third pool costs you very little variance and buys the network real decentralization. That is not charity; a 51 percent incident on your coin costs you far more than a slightly lumpier payout schedule.

The fee is one line in the contract. Read the rest of it.