The Big Picture
SubnetTAO is the TAO side of the AMM pool. Together with SubnetAlphaIn, it determines the exchange rate for staking and unstaking. More TAO in the pool means alpha is relatively cheaper (you get more alpha per TAO). The constant product (SubnetTAO × SubnetAlphaIn = k) ensures there's always liquidity.
Why This Matters
What's the exchange rate for staking? SubnetTAO is half the equation. TAO/Alpha rate = SubnetAlphaIn / SubnetTAO. This determines how much alpha you receive when you stake.
Example Scenario
Query SubnetTAO(netuid=1) returns 1000000000000000 (1M TAO in RAO). SubnetAlphaIn returns 10T alpha. Rate = 10T / 1M TAO = 10,000 alpha per TAO. Staking 100 TAO gets you ~1M alpha (minus slippage).
Common Questions
- Why does this change?
- When you stake, you add TAO to the pool (SubnetTAO increases) and receive alpha (SubnetAlphaIn decreases). The opposite happens when unstaking.
- What's slippage?
- Large trades move the price. If SubnetTAO is 1M and you stake 100K TAO, you're adding 10% to the pool - the rate changes significantly during your trade.
- Can the pool run out of TAO?
- The AMM curve prevents depletion. As TAO gets scarce, unstaking becomes very unfavorable, naturally discouraging withdrawal.
Use Cases
- Calculate current TAO/alpha exchange rate
- Estimate slippage for large stake operations
- Build AMM pool visualizations and analytics
- Monitor subnet liquidity depth
- Track TAO inflows and outflows per subnet
From Chain Metadata
MAP ( netuid ) --> tao_in_subnet | Returns the amount of TAO in the subnet.
Purpose & Usage
Purpose
Track TAO side of subnet AMM - the other half of the constant product formula.
Common Query Patterns
- Query by netuid for pool state
- Combine with SubnetAlphaIn to calculate exchange rate
- Monitor pool depth for slippage estimation
Query Keys
| # | Name | Type | Description |
|---|---|---|---|
| 1 | netuid | u16 | netuid (u16, hashed key component) |
Stored Value
Relationships
Modified By
Related Events
Code Examples
import { createClient, Binary } from "polkadot-api";
import { getWsProvider } from "polkadot-api/ws";
import { sub } from "@polkadot-api/descriptors"; // generated by: npx papi add sub -w wss://entrypoint-finney.opentensor.ai:443
const client = createClient(getWsProvider("wss://entrypoint-finney.opentensor.ai:443"));
const api = client.getTypedApi(sub);
// Query SubnetTAO storage
const netuid = 1;
const result = await api.query.SubtensorModule.SubnetTAO.getValue(netuid);
console.log("SubnetTAO:", result);On-Chain Activity
1M–10M estimated writes
#10 most written storage item
Modified via user-submitted extrinsics
As of block 7,429,232
Version History
Runtime Info
View Source- Pallet
- SubtensorModule
- Storage Kind
- Map
- First Version
- v233
- Current Version
- v411