Transactions

serve-axon

Publish this hotkey's axon endpoint (ip:port) for a subnet.

Writes the connection info to chain storage so validators on the subnet know where to reach this miner or validator; it does not start any server — running the actual axon service is up to the caller. Signed by the hotkey, which must be registered on the subnet, and subject to the chain's serving rate limit (re-publishing too soon fails). Use serve_axon_tls if peers should verify a TLS certificate, and reset_axon to stop advertising the endpoint.

Signer	Origin	Pallet	Wraps
`hotkey`	signed account (pallet role may apply)	SubtensorModule	`SubtensorModule.serve_axon`

Parameters

Parameter	Type	Required	Description
`netuid`	integer	yes	Subnet on which to publish the endpoint.
`ip`	string	yes	Public IPv4 or IPv6 address of the endpoint, in standard dotted or colon notation.
`port`	integer	yes	TCP port the endpoint listens on.
`protocol`	integer	no	Application protocol tag stored alongside the endpoint; its meaning is subnet-defined.
`version`	integer	no	Version number of the serving neuron's software, stored with the endpoint.

Address parameters (--hotkey, --coldkey, --dest, ...) accept a raw ss58 address, an address-book or proxy-book name, or a local wallet/hotkey name.

CLI

Preview with --dry-run (shows fee, effects, and policy result without submitting), then submit:

btcli tx serve-axon \
  --netuid <int> \
  --ip <value> \
  --port <int> --dry-run
btcli tx serve-axon \
  --netuid <int> \
  --ip <value> \
  --port <int> -w my_coldkey

Python

import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.ServeAxon(netuid=1, ip="...", port=0)

sub = bt.Subtensor()
plan = sub.plan(intent, wallet)   # fee, effects, policy — no submission
result = sub.execute(intent, wallet)
if not result.success:
    print(result.error.code, result.error.remediation)

(bt.Subtensor is also the async client — async with bt.Subtensor() as client: — see The client.) Or build the intent by op name, as an agent would:

result = sub.execute_tool("serve_axon", {...}, wallet)

On-chain implementation

SubtensorModule.serve_axon — pallets/subtensor/src/macros/dispatches.rs#L642:

#[pallet::call_index(4)]
#[pallet::weight((<T as crate::pallet::Config>::WeightInfo::serve_axon(), DispatchClass::Normal, Pays::No))]
pub fn serve_axon(
    origin: OriginFor<T>,
    netuid: NetUid,
    version: u32,
    ip: u128,
    port: u16,
    ip_type: u8,
    protocol: u8,
    placeholder1: u8,
    placeholder2: u8,
) -> DispatchResult {
    Self::do_serve_axon(
        origin,
        netuid,
        version,
        ip,
        port,
        ip_type,
        protocol,
        placeholder1,
        placeholder2,
        None,
    )
}

Delegates to do_serve_axon.

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