# Create link URL: https://docs.hanzo.ai/docs/openapi/link/post-link > Registers a signed-in AI provider account on a machine. `POST /v1/link` > [Link →](https://docs.hanzo.ai/docs/openapi/link) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides) | | | | ------------- | -------------------------------------- | | **Address** | `https://api.hanzo.ai/v1/link` | | **Method** | `POST` | | **Operation** | `post_link` | | **Auth** | `Authorization: Bearer $HANZO_API_KEY` | Registers a signed-in AI provider account on a machine. It records that a developer has signed into one provider account on one machine — a Claude Max or ChatGPT Plus subscription, a Hanzo key, a raw provider key — and answers 201 with the stored link. Re-reporting the same (machine, provider, account) UPDATES that link rather than creating a second, so a collector may call this on every heartbeat. machine and provider are required (400 otherwise), as is a valid kind, and every field is length-bounded. Scoped to the caller: a validated principal and a non-empty org, else 403, so a caller writes only their OWN accounts within their own org. ## Request 8 fields, body `application/json` (required). | Field | In | Type | Required | Description | | ---------- | ---- | ------ | -------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `account` | body | string | — | Account is the provider-side account identifier. | | `host` | body | string | — | Host is the machine's human hostname label. | | `kind` | body | string | — | Kind decides how the account's inference BILLS and defaults to subscription: a subscription account bills the user's own monthly plan and is metered here for visibility only, while an apikey account bills through commerce on the gateway path. | | `machine` | body | string | — | Machine is the stable machine identifier. | | `os` | body | string | — | OS is the machine's operating system label. | | `plan` | body | string | — | Plan is the provider plan label (e.g. "Claude Max"). | | `provider` | body | string | — | Provider is the AI provider the account belongs to. | | `usage` | body | any | — | Usage is an optional usage snapshot, clamped and re-serialized to known fields; omitting it keeps the last good one. | ## Response | Status | Body | Meaning | | --------- | --------------- | ------- | | `201` | link.linkView | created | | `default` | problem-details | refused | `201` body — 15 fields. | Field | In | Type | Always | Description | | ----------- | ---- | ------ | ------ | ---------------------------------------------------------------------------------------------------------------------------------------------------- | | `account` | body | string | — | Account is the provider-side account identifier, when the collector knows it. | | `billing` | body | string | — | Billing is how this account's inference bills — plan (the user's own subscription, metered here for visibility only) or commerce (the gateway path). | | `createdAt` | body | string | — | CreatedAt is when the link was first registered, RFC 3339 UTC. | | `host` | body | string | — | Host is the machine's human hostname label, from its most recent report. | | `id` | body | string | — | ID is the link's opaque handle ("link\_" + 32 hex chars). | | `kind` | body | string | — | Kind is how the account authenticates: subscription or apikey. | | `lastSeen` | body | string | — | LastSeen is when the account last reported, RFC 3339 UTC. | | `machine` | body | string | — | Machine is the stable machine identifier the collector reports. | | `os` | body | string | — | OS is the machine's operating system label. | | `plan` | body | string | — | Plan is the provider plan label (e.g. "Claude Max"). | | `provider` | body | string | — | Provider is the AI provider this account belongs to (claude, openai, hanzo…). | | `status` | body | string | — | Status is linked or revoked. | | `updatedAt` | body | string | — | UpdatedAt is when the link was last refreshed, RFC 3339 UTC. | | `usage` | body | any | — | Usage is the last good usage snapshot, clamped and re-serialized to known fields at ingest. | | `user` | body | string | — | User is the owning subject — the validated caller who registered the link. | Failure carries the platform error shape — see [Errors](https://docs.hanzo.ai/docs/errors). ## Examples **CLI** ```bash hanzo auth link create ``` **SDK** **.ts** ```ts import { Configuration, LinkApi } from 'hanzoai'; const api = new LinkApi(new Configuration({ accessToken: process.env.HANZO_API_KEY })); const { data } = await api.postLink({ account: "", host: "" }); ``` **.py** ```python from hanzoai.cloud import ApiClient, Configuration from hanzoai.cloud.api import LinkApi client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"])) result = LinkApi(client).post_link(account="", host="") ``` **.go** ```go cfg := hanzoai.NewConfiguration() cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY")) client := hanzoai.NewAPIClient(cfg) resp, _, err := client.LinkAPI.PostLink(context.Background()).Execute() if err != nil { return err } ``` **.rs** ```rust use hanzo_client::apis::{configuration::Configuration, link_api}; let mut cfg = Configuration::new(); cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok(); let result = link_api::post_link(&cfg, Default::default()).await?; ``` **.java** ```java import ai.hanzo.cloud.ApiClient; import ai.hanzo.cloud.api.LinkApi; ApiClient client = new ApiClient(); client.setBearerToken(System.getenv("HANZO_API_KEY")); var result = new LinkApi(client).postLink(); ``` **HTTP** ```bash curl -X POST https://api.hanzo.ai/v1/link \ -H "Authorization: Bearer $HANZO_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "account": "", "host": "" }' ``` **MCP** MCP reaches **link** through the `link` tool, which names its 11 operations with its own verbs — this one among them, under a name only MCP declares. `describe` explains any of them: ```bash curl -X POST https://api.hanzo.ai/v1/mcp \ -H "Content-Type: application/json" \ -d '{ "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "describe", "arguments": { "op": "list_links" } } }' ``` --- [Link API](https://docs.hanzo.ai/docs/openapi/link) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)