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# Algorithms
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Since version 3 mining [algorithm ](#algorithm-names ) should specified for each pool separately (`algo` option), earlier versions was use one global `algo` option and per pool `variant` option (this option was removed in v3). If your pool support [mining algorithm negotiation ](https://github.com/xmrig/xmrig-proxy/issues/168 ) you may not specify this option at all.
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#### Example
```json
{
"pools": [
{
"url": "...",
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"algo": "cn/r",
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...
}
],
...
}
```
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#### Pools with mining algorithm negotiation support.
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* [www.hashvault.pro ](https://www.hashvault.pro/ )
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* [moneroocean.stream ](https://moneroocean.stream )
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## Algorithm names
| Name | Memory | Notes |
|-----------------|--------|--------------------------------------------------------------------------------------|
| `cn/0` | 2 MB | CryptoNight (original) |
| `cn/1` | 2 MB | CryptoNight variant 1 also known as `Monero7` and `CryptoNightV7` . |
| `cn/2` | 2 MB | CryptoNight variant 2. |
| `cn/r` | 2 MB | CryptoNightR (Monero's variant 4). |
| `cn/wow` | 2 MB | CryptoNightR (Wownero). |
| `cn/fast` | 2 MB | CryptoNight variant 1 with half iterations. |
| `cn/half` | 2 MB | CryptoNight variant 2 with half iterations (Masari/Torque) |
| `cn/xao` | 2 MB | CryptoNight variant 0 (modified, Alloy only) |
| `cn/rto` | 2 MB | CryptoNight variant 1 (modified, Arto only) |
| `cn/rwz` | 2 MB | CryptoNight variant 2 with 3/4 iterations and reversed shuffle operation (Graft). |
| `cn/zls` | 2 MB | CryptoNight variant 2 with 3/4 iterations (Zelerius). |
| `cn/double` | 2 MB | CryptoNight variant 2 with double iterations (X-CASH). |
| `cn/gpu` | 2 MB | CryptoNight-GPU (RYO). |
| `cn-lite/0` | 1 MB | CryptoNight-Lite variant 0. |
| `cn-lite/1` | 1 MB | CryptoNight-Lite variant 1. |
| `cn-heavy/0` | 4 MB | CryptoNight-Heavy . |
| `cn-heavy/xhv` | 4 MB | CryptoNight-Heavy (modified, TUBE only). |
| `cn-heavy/tube` | 4 MB | CryptoNight-Heavy (modified, Haven Protocol only). |
| `cn-pico` | 256 KB | TurtleCoin (TRTL) |
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| `rx/test` | 2 MB | RandomX (reference configuration). |
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| `rx/0` | 2 MB | RandomX (reference configuration), reserved for future use. |
| `rx/wow` | 1 MB | RandomWOW (Wownero). |
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| `rx/loki` | 2 MB | RandomXL (Loki). |
