Comparison of mining pools

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Reward types & explanation:

  • PPS - Pay Per Share. Each submitted share is worth certain amount of BTC. Since finding a block requires <current difficulty> shares on average, a PPS method with 0% fee would be 50 BTC divided by <current difficulty>. It is risky for pool operators, hence the fee is highest.
  • SMPPS - Shared Maximum Pay Per Share. Like Pay Per Share, but never pays more than the pool earns. [1]
  • ESMPPS - Equalized Shared Maximum Pay Per Share. Like SMPPS, but equalizes payments fairly among all those who are owed. [2]
  • CPPSRB - Capped Pay Per Share with Recent Backpay.
  • Prop. - Proportional. When block is found, the reward is distributed among all workers proportionally to how much shares each of them has found.
  • PPLNS - Pay Per Last N Shares. Similar to proportional, but instead of looking at the number of shares in the round, instead looks at the last N shares, regardless of round boundaries.
  • Score - Score based system: a proportional reward, but weighed by time submitted. Each submitted share is worth more in the function of time t since start of current round. For each share score is updated by: score += exp(t/C). This makes later shares worth much more than earlier shares, thus the miner's score quickly diminishes when they stop mining on the pool. Rewards are calculated proportionally to scores (and not to shares). (at slush's pool C=300 seconds, and every hour scores are normalized)

Visual examples of the various payout methods

Name Location Hashrate (GHash/sec)[1][2] Reward Type Transaction fees Fee PPS Fee Prop / Score Audits[3] Protocol Launched Shut down Forum Thread Homepage
21bitcoin CN, HK 2 Prop. kept by pool 0% ? RPC+LP 2011-06-20 [3] Link
ABCPool.co USA 133 PPS[4] kept by pool 0%[5] ? RPC+LP 2011-08-02 Link Link
ArsBitcoin USA 500 SMPPS kept by pool 0%[5] ? RPC+LP 2011-06-15 Link Link
Betcoin.co Pool USA 5.9 PPLNS kept by pool 0% ? RPC+LP 2011-07-07 Link Link
Bitarama.com USA 0.021 Prop kept by pool ? RPC+LP 2011-08-02 Link
BitClockers USA, EU 193 Prop. kept by pool 2% ? RPC+LP 2011-05-27 Link Link
Bitcoin Mining Pool USA 63.6 Prop. kept by pool 0%[5] ? RPC+LP Unknown Link Link
Bitcoin Pooled Mining (Slush) London 1830 Score kept by pool 2% ? RPC 2010-11-27 Link Link
Bitcoinitalia Italy 0.45 Prop. kept by pool 0% ? RPC+LP 2011-07-12 Link Link
Bitcoins.lc EU 500 Prop. kept by pool 0% ? RPC+LP 2011-05-27 Link Link
BitLotto Pool Los Angeles 0.4 Prop kept by pool ? RPC+LP 2011-06-08 Link Link
BitMinter USA 15.6 Prop. kept by pool 0% Yes[6] RPC+LP 2011-06-18 Link Link
Bitp.it USA 47.5 ESMPPS kept by pool 0% ? RPC+LP 2011-06-08 Link Link
BitPenny CPPSRB 3% Proprietary
BTC Guild USA, EU 2050 Prop. kept by pool 0%[7] ? RPC+LP 2011-05-09 Link Link
BTCMine UK 383 Score kept by pool 2% ? RPC+LP 2011-03-11 Link Link
btcmp.com Germany 70.8 Prop kept by pool 0% ? RPC+LP 2011-06-28 Link
BTCSERV.net Germany 10 PPS / Prop kept by pool 0% 0% ? RPC+LP 2011-07-09 Link Link
Btcworld.de Germany 1.5 Prop kept by pool ? ? RPC+LP 2011-06-18 Link
CHWpool Chile 0 Prop kept by pool 1% ? RPC+LP 2011-06-30 Link
Coinotron (BTC,NMC,IXC,I0C,SC) Poland 29 Prop kept by pool 0% ? RPC+LP 2011-07-06 Link Link
Continuum Canada 0 Score kept by pool 0% ? RPC+LP 2011-05-17 2011-07-11 Link Link
DeepBit Germany 5357 PPS / Prop. kept by pool 10% 3% ? RPC+LP 2011-02-26 Link Link
Eclipse Mining Consortium USA / Europe / AU / Asia 85 Score (Meni) kept by pool 0% ? RPC+LP 2011-06-14 Link Link
Eligius Germany 600 SMPPS kept by pool 0.000001%[5] Yes[8] RPC+LP, Binary 2011-04-27 Link Link
Mainframe Mining Cooperative Int'l/Holland 170 PPLNS kept by pool 0% 0.5% Yes RPC+LP, Binary 2011-07-15 Link Link
Mineco.in UK 111 PPLNS shared 0% ? RPC+LP 2011-06-15 Link Link
Mining Team Reddit (MtRed) USA, EU 172 Prop kept by pool 0%[5] ? RPC+LP 2011-05-25 1 2 Link
NoFeeMining USA 48 RSMPPS shared 0% ? RPC+LP 2011-06-17 Link Link
Ozco.in AUS 69 Prop kept by pool 0% ? RPC+LP 2011-06-08 Link Link
P2Pool Earth (P2P) 8 PPLNS shared 0.5% Yes RPC+LP[9] 2011-06-17 Link Link
PolMine Poland 130 Prop. shared 0% ? RPC 2011-06-13 Link Link
PoolMunity France 0.4 Score kept by pool 1.5% ? RPC+LP 2011-07-24 2011-09-01 Link Link
rfcpool UK 30 PPLNS shared 0%[5] 0% ? RPC+LP 2011-07-05 Link Link
Simplecoin Unknown 28.3 PPLNS kept by pool 0%[10] ? RPC+LP 2011-06-02 Link Link
Swepool Sweden 1 Prop kept by pool 0% ? RPC+LP 2011-05-14 Link Link
Triplemining Europe 20.6 Prop kept by pool 1% Yes[6] RPC+LP 2011-06-28 Link Link
UnitedMiners US 30 Prop kept by pool 0% ? RPC+LP 2011-06-28 Link Link
x8s Germany 0 Prop kept by pool 1% ? RPC+LP 2011-06-08 2011-07-24 Link Link
ZA Bitcoin South Africa 0 Score kept by pool 0% ? RPC+LP 2011-06-14 2011-07-18 Link Link
  1. ↑ Hashrate is given in gigahash/second.
  2. ↑ Note that pool hashrate is largely irrelevant but can be seen as a popularity measurement. Note however that it is a theoretical security issue if one pool gains above 50% of the total computational power of the network, thus consider joining a pool based on other metrics.
  3. ↑ Auditing can be accomplished by third-parties if the pool publishes proofs-of-work for every share.
  4. ↑ ABCPool also rewards stale shares
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Donations are possible
  6. ↑ 6.0 6.1 Access to proofs-of-work is available on request.
  7. ↑ Donations are possible to unlock features
  8. ↑ Access to Eligius proofs-of-work is available on request.
  9. ↑ Against a local p2pool node
  10. ↑ While in testing.

See also

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