> For the complete documentation index, see [llms.txt](https://docs.unix.market/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.unix.market/rest-api/sub-accounts.md).

# Sub-Accounts

## Create Sub-Account

> Create a UniX-generated sub-account under the main account.

```json
{"openapi":"3.0.3","info":{"title":"UniX API","version":"1.11.0"},"tags":[{"name":"Sub-Accounts"}],"servers":[{"url":"https://api.unixtrade.pro/v1","description":"Production"}],"paths":{"/account/create-sub":{"post":{"tags":["Sub-Accounts"],"summary":"Create Sub-Account","operationId":"createSubAccount","description":"Create a UniX-generated sub-account under the main account.","requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","required":["label","address","nonce","expires_after","signature"],"properties":{"label":{"type":"string","description":"Unique within the main account."},"address":{"type":"string"},"nonce":{"type":"integer","format":"int64"},"expires_after":{"type":"integer","format":"int64"},"signature":{"$ref":"#/components/schemas/Signature"}}}}}},"responses":{"200":{"description":"Sub-account created","content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ResponseEnvelope"},{"type":"object","properties":{"data":{"type":"object","properties":{"tx_hash":{"type":"string"},"sub_address":{"type":"string"},"label":{"type":"string"}}}}}]}}}},"422":{"description":"Errors: `20014` (signer cannot create sub), `20015` (label exists), `20017` (limit)"}}}}},"components":{"schemas":{"Signature":{"type":"object","description":"ECDSA signature components `(r, s, v)` over the EIP-712 signing hash.","required":["r","s","v"],"properties":{"r":{"type":"string","description":"32-byte hex string with `0x` prefix."},"s":{"type":"string","description":"32-byte hex string with `0x` prefix."},"v":{"type":"integer","description":"Recovery identifier — typically 27 or 28.","enum":[27,28]}}},"ResponseEnvelope":{"type":"object","description":"Standard response envelope shared by every endpoint.","required":["code","msg","data"],"properties":{"code":{"type":"string","description":"`\"0\"` for success. Non-zero indicates an error code — see [Error Codes](/reference/error-codes)."},"msg":{"type":"string","description":"Empty on success; human-readable error description on failure."},"data":{"description":"Endpoint-specific payload on success; `null` on failure.","nullable":true},"trace_code":{"type":"string","description":"Backend trace identifier. Empty on success; populated on failure for support diagnostics."}}}}}}
```

## List Children (Sub-Accounts)

> Return the sub-accounts currently controlled by a main account.

```json
{"openapi":"3.0.3","info":{"title":"UniX API","version":"1.11.0"},"tags":[{"name":"Sub-Accounts"}],"servers":[{"url":"https://api.unixtrade.pro/v1","description":"Production"}],"paths":{"/account/children":{"get":{"tags":["Sub-Accounts"],"summary":"List Children (Sub-Accounts)","operationId":"listChildren","description":"Return the sub-accounts currently controlled by a main account.","parameters":[{"$ref":"#/components/parameters/AddressQuery"}],"responses":{"200":{"description":"Children list","content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ResponseEnvelope"},{"type":"object","properties":{"data":{"type":"object","properties":{"list":{"type":"array","items":{"$ref":"#/components/schemas/AccountChild"}}}}}}]}}}}}}}},"components":{"parameters":{"AddressQuery":{"name":"address","in":"query","required":true,"schema":{"type":"string","pattern":"^0x[a-fA-F0-9]{40}$"},"description":"Account address (`0x`-prefixed hex)."}},"schemas":{"ResponseEnvelope":{"type":"object","description":"Standard response envelope shared by every endpoint.","required":["code","msg","data"],"properties":{"code":{"type":"string","description":"`\"0\"` for success. Non-zero indicates an error code — see [Error Codes](/reference/error-codes)."},"msg":{"type":"string","description":"Empty on success; human-readable error description on failure."},"data":{"description":"Endpoint-specific payload on success; `null` on failure.","nullable":true},"trace_code":{"type":"string","description":"Backend trace identifier. Empty on success; populated on failure for support diagnostics."}}},"AccountChild":{"type":"object","properties":{"address":{"type":"string"},"type":{"type":"string","enum":["sub"]},"label":{"type":"string","description":"Sub-account label (only present when `type=sub`)."},"linked_at":{"type":"integer","format":"int64"}}}}}}
```

## Get Main Account

> Return the main account that controls a given sub-account, or null when none exists.

```json
{"openapi":"3.0.3","info":{"title":"UniX API","version":"1.11.0"},"tags":[{"name":"Sub-Accounts"}],"servers":[{"url":"https://api.unixtrade.pro/v1","description":"Production"}],"paths":{"/account/main":{"get":{"tags":["Sub-Accounts"],"summary":"Get Main Account","operationId":"getMainAccount","description":"Return the main account that controls a given sub-account, or null when none exists.","parameters":[{"$ref":"#/components/parameters/AddressQuery"}],"responses":{"200":{"description":"Main account (or null)","content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/ResponseEnvelope"},{"type":"object","properties":{"data":{"type":"object","properties":{"main_address":{"type":"string","nullable":true},"type":{"type":"string","nullable":true,"enum":["sub",null]}}}}}]}}}}}}}},"components":{"parameters":{"AddressQuery":{"name":"address","in":"query","required":true,"schema":{"type":"string","pattern":"^0x[a-fA-F0-9]{40}$"},"description":"Account address (`0x`-prefixed hex)."}},"schemas":{"ResponseEnvelope":{"type":"object","description":"Standard response envelope shared by every endpoint.","required":["code","msg","data"],"properties":{"code":{"type":"string","description":"`\"0\"` for success. Non-zero indicates an error code — see [Error Codes](/reference/error-codes)."},"msg":{"type":"string","description":"Empty on success; human-readable error description on failure."},"data":{"description":"Endpoint-specific payload on success; `null` on failure.","nullable":true},"trace_code":{"type":"string","description":"Backend trace identifier. Empty on success; populated on failure for support diagnostics."}}}}}}
```


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