# Bittensor Subnet Registration Lookup API

> Bittensor Subnet Registration Lookup API is a paid API for AI agents from golf-evm-math.x402-evm-math.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Returns registration burn cost in TAO, free slot count, max UIDs, and prune-bar incentive threshold for a single Bittensor subnet identified by netuid.

## Facts

- Endpoint: GET https://golf-evm-math.x402-evm-math.workers.dev/bittensor/subnet?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bittensor-subnet-registration-lookup-api-b32b3701
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qM3DQfqw8GX4NMQFAZGDI

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability bittensor-subnet-registration-lookup-api-b32b3701
```

Example prompt: What's the current registration burn cost in TAO and how many free slots are left on Bittensor subnet 1 right now?

## When to prefer this

Use this endpoint when you need fast, per-subnet registration intelligence for a specific Bittensor subnet — particularly the burn cost, slot availability, and prune risk — without querying all subnets. Prefer this over the all-subnets endpoint when you already know the netuid and want lower latency and lower cost per call.

## Known failure modes

- Invalid or nonexistent netuid returns an error or empty response
- Network connectivity issues to Bittensor Finney may cause timeout
- Missing required netuid query parameter results in a 400-level error
- Stale data if the Bittensor chain state hasn't been recently indexed

## How this service works

Exact EVM address, calldata, Uniswap V2/V3 and impermanent-loss math. Pay per call in USDC on Base via x402.

## Output

Returns a JSON object containing the subnet's netuid, current number of registered UIDs, maximum UID capacity, registration burn cost in TAO (burn_tao), the prune bar incentive threshold, and the network name (bittensor-finney).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "subnet": {
   "uids": 256,
   "netuid": 1,
   "burn_tao": 0.0036,
   "max_uids": 256,
   "prune_bar_incentive": 0
  },
  "network": "bittensor-finney"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bittensor-subnet-registration-lookup-api-b32b3701/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from golf-evm-math.x402-evm-math.workers.dev](https://www.zero.xyz/host/golf-evm-math.x402-evm-math.workers.dev/llms.txt)