# Create span percentile

URL: https://docs.hanzo.ai/docs/openapi/o11y/post-o11y-span-percentile

> Places one span's duration among its peers: the p50/p90/p99 durations of like spans, and the percentile the given duration lands at.

`POST /v1/o11y/span_percentile`

> [O11y →](https://docs.hanzo.ai/docs/openapi/o11y) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides)

|               |                                                |
| ------------- | ---------------------------------------------- |
| **Address**   | `https://api.hanzo.ai/v1/o11y/span_percentile` |
| **Method**    | `POST`                                         |
| **Operation** | `post_o11y_span_percentile`                    |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`         |

Places one span's duration among its peers: the p50/p90/p99
durations of like spans, and the percentile the given duration lands at.

Callers need the viewer role; the runtime's own gate enforces it.

## Request

7 fields, body `application/json` (required).

| Field                  | In   | Type             | Required | Description                                                          |
| ---------------------- | ---- | ---------------- | -------- | -------------------------------------------------------------------- |
| `end`                  | body | integer (uint64) | —        | End is the window end, as epoch nanoseconds.                         |
| `name`                 | body | string           | yes      | Name is the span name whose peers are compared.                      |
| `resourceAttributes`   | body | object           | —        | ResourceAttributes narrow the peer group to spans carrying them all. |
| `resourceAttributes.*` | body | string           | —        |                                                                      |
| `serviceName`          | body | string           | yes      | ServiceName is the service the span belongs to.                      |
| `spanDuration`         | body | integer (int64)  | —        | SpanDuration is the span's duration in nanoseconds.                  |
| `start`                | body | integer (uint64) | —        | Start is the window start, as epoch nanoseconds.                     |

## Response

| Status    | Body                       | Meaning           |
| --------- | -------------------------- | ----------------- |
| `200`     | o11y.O11ySpanPercentileOut | ok                |
| `202`     | Approval                   | held for approval |
| `default` | problem-details            | refused           |

`200` body — 9 fields.

| Field                       | In   | Type                        | Always | Description                                         |
| --------------------------- | ---- | --------------------------- | ------ | --------------------------------------------------- |
| `data`                      | body | o11y.O11ySpanPercentile     | —      |                                                     |
| `data.percentiles`          | body | o11y.O11yPercentiles        | —      |                                                     |
| `data.percentiles.p50`      | body | number (double)             | —      | P50 is the median.                                  |
| `data.percentiles.p90`      | body | number (double)             | —      | P90 is the 90th percentile.                         |
| `data.percentiles.p99`      | body | number (double)             | —      | P99 is the 99th percentile.                         |
| `data.position`             | body | o11y.O11yPercentilePosition | —      |                                                     |
| `data.position.description` | body | string                      | —      | Description says the same in words.                 |
| `data.position.percentile`  | body | number (double)             | —      | Percentile is the percentile the duration lands at. |
| `status`                    | body | string                      | —      | Status is "success".                                |

Failure carries the platform error shape — see [Errors](https://docs.hanzo.ai/docs/errors).

## Examples

**CLI**

```bash
hanzo o11y span_percentile \
  --name <name> \
  --service-name <serviceName>
```

**SDK**

**.ts**

```ts
import { Configuration, O11yApi } from 'hanzoai';

const api = new O11yApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postO11ySpanPercentile({ name: "<name>", serviceName: "<serviceName>" });
```

**.py**

```python
from hanzoai.cloud import ApiClient, Configuration
from hanzoai.cloud.api import O11yApi

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = O11yApi(client).post_o11y_span_percentile(name="<name>", service_name="<serviceName>")
```

**.go**

```go
cfg := hanzoai.NewConfiguration()
cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY"))
client := hanzoai.NewAPIClient(cfg)

resp, _, err := client.O11yAPI.PostO11ySpanPercentile(context.Background()).Execute()
if err != nil {
	return err
}
```

**.rs**

```rust
use hanzo_client::apis::{configuration::Configuration, o11y_api};

let mut cfg = Configuration::new();
cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok();

let result = o11y_api::post_o11y_span_percentile(&cfg, Default::default()).await?;
```

**.java**

```java
import ai.hanzo.cloud.ApiClient;
import ai.hanzo.cloud.api.O11yApi;

ApiClient client = new ApiClient();
client.setBearerToken(System.getenv("HANZO_API_KEY"));

var result = new O11yApi(client).postO11ySpanPercentile();
```

**HTTP**

```bash
curl -X POST https://api.hanzo.ai/v1/o11y/span_percentile \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "name": "<name>",
       "serviceName": "<serviceName>"
     }'
```

**MCP**

MCP reaches **o11y** through the `o11y` tool, which names its 307 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_o11y_autocomplete_aggregate_attributes"
         }
       }
     }'
```

---

[O11y API](https://docs.hanzo.ai/docs/openapi/o11y) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)