Create span | Opik Documentation

POST/v1/private/spansCreate span

Create span

Request body

application/json

objectSpan_Write

end_timestring · date-time

environmentstring

maxLength 150 · minLength 0

error_infoobject

Show child attributes

exception_typestringrequired

minLength 1

messagestring

tracebackstringrequired

minLength 1

idstring · uuid

inputobject

Show child attributes

anyOf · 3 options

Option 1object

Option 2array of object

Option 3string

last_updated_atstring · date-time

metadataobjectJsonListString_Write ↑

modelstring

namestring

outputobjectJsonListString_Write ↑

parent_span_idstring · uuid

project_namestring

If null, the default project is used

pattern (?s)^\s*(\S.*\S|\S)\s*$

providerstring

sourcestring

one of "sdk", "experiment", "playground", "optimization", "evaluator"

start_timestring · date-timerequired

tagsarray of string

uniqueItems true

Show child attributes

uniqueItems true

total_estimated_costnumber

minimum 0

total_estimated_cost_versionstring

trace_idstring · uuid

ttftnumber · double

Time to first token in milliseconds

typestring

one of "general", "tool", "llm", "guardrail"

usageobject

Example request

{
  "end_time": "2026-06-09T00:00:00Z",
  "environment": "string",
  "error_info": {
    "exception_type": "string",
    "message": "string",
    "traceback": "string"
  },
  "id": "00000000-0000-0000-0000-000000000000",
  "input": {},
  "last_updated_at": "2026-06-09T00:00:00Z",
  "metadata": {},
  "model": "string",
  "name": "string",
  "output": {},
  "parent_span_id": "00000000-0000-0000-0000-000000000000",
  "project_name": "string",
  "provider": "string",
  "source": "evaluator",
  "start_time": "2026-06-09T00:00:00Z",
  "tags": [
    "string"
  ],
  "total_estimated_cost": 0,
  "total_estimated_cost_version": "string",
  "trace_id": "00000000-0000-0000-0000-000000000000",
  "ttft": 0,
  "type": "general",
  "usage": {
    "additionalProp1": 0
  }
}

Responses

Headers

Location

objectErrorMessage

codeinteger · int32

detailsstring

messagestring

Example response

{
  "code": 0,
  "details": "string",
  "message": "string"
}

Examples

curl -X POST 'http://localhost:5173/api/v1/private/spans' \
  -H 'Content-Type: application/json' \
  -d '{"end_time":"2026-06-09T00:00:00Z","environment":"string","error_info":{"exception_type":"string","message":"string","traceback":"string"},"id":"00000000-0000-0000-0000-000000000000","input":{},"last_updated_at":"2026-06-09T00:00:00Z","metadata":{},"model":"string","name":"string","output":{},"parent_span_id":"00000000-0000-0000-0000-000000000000","project_name":"string","provider":"string","source":"evaluator","start_time":"2026-06-09T00:00:00Z","tags":["string"],"total_estimated_cost":0,"total_estimated_cost_version":"string","trace_id":"00000000-0000-0000-0000-000000000000","ttft":0,"type":"general","usage":{"additionalProp1":0}}'

const response = await fetch('http://localhost:5173/api/v1/private/spans', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({"end_time":"2026-06-09T00:00:00Z","environment":"string","error_info":{"exception_type":"string","message":"string","traceback":"string"},"id":"00000000-0000-0000-0000-000000000000","input":{},"last_updated_at":"2026-06-09T00:00:00Z","metadata":{},"model":"string","name":"string","output":{},"parent_span_id":"00000000-0000-0000-0000-000000000000","project_name":"string","provider":"string","source":"evaluator","start_time":"2026-06-09T00:00:00Z","tags":["string"],"total_estimated_cost":0,"total_estimated_cost_version":"string","trace_id":"00000000-0000-0000-0000-000000000000","ttft":0,"type":"general","usage":{"additionalProp1":0}}),
});
const data = await response.json();

const response = await fetch('http://localhost:5173/api/v1/private/spans', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: "{\"end_time\":\"2026-06-09T00:00:00Z\",\"environment\":\"string\",\"error_info\":{\"exception_type\":\"string\",\"message\":\"string\",\"traceback\":\"string\"},\"id\":\"00000000-0000-0000-0000-000000000000\",\"input\":{},\"last_updated_at\":\"2026-06-09T00:00:00Z\",\"metadata\":{},\"model\":\"string\",\"name\":\"string\",\"output\":{},\"parent_span_id\":\"00000000-0000-0000-0000-000000000000\",\"project_name\":\"string\",\"provider\":\"string\",\"source\":\"evaluator\",\"start_time\":\"2026-06-09T00:00:00Z\",\"tags\":[\"string\"],\"total_estimated_cost\":0,\"total_estimated_cost_version\":\"string\",\"trace_id\":\"00000000-0000-0000-0000-000000000000\",\"ttft\":0,\"type\":\"general\",\"usage\":{\"additionalProp1\":0}}" });
console.log(await response.json());

import requests

response = requests.request(
    "POST",
    "http://localhost:5173/api/v1/private/spans",
    headers={"Content-Type": "application/json"},
    data='{"end_time":"2026-06-09T00:00:00Z","environment":"string","error_info":{"exception_type":"string","message":"string","traceback":"string"},"id":"00000000-0000-0000-0000-000000000000","input":{},"last_updated_at":"2026-06-09T00:00:00Z","metadata":{},"model":"string","name":"string","output":{},"parent_span_id":"00000000-0000-0000-0000-000000000000","project_name":"string","provider":"string","source":"evaluator","start_time":"2026-06-09T00:00:00Z","tags":["string"],"total_estimated_cost":0,"total_estimated_cost_version":"string","trace_id":"00000000-0000-0000-0000-000000000000","ttft":0,"type":"general","usage":{"additionalProp1":0}}',
)
print(response.json())

package main

import (
	"context"
	"net/http"
	"strings"
)

func main() {
	ctx := context.Background()
	body := strings.NewReader(`{"end_time":"2026-06-09T00:00:00Z","environment":"string","error_info":{"exception_type":"string","message":"string","traceback":"string"},"id":"00000000-0000-0000-0000-000000000000","input":{},"last_updated_at":"2026-06-09T00:00:00Z","metadata":{},"model":"string","name":"string","output":{},"parent_span_id":"00000000-0000-0000-0000-000000000000","project_name":"string","provider":"string","source":"evaluator","start_time":"2026-06-09T00:00:00Z","tags":["string"],"total_estimated_cost":0,"total_estimated_cost_version":"string","trace_id":"00000000-0000-0000-0000-000000000000","ttft":0,"type":"general","usage":{"additionalProp1":0}}`)
	req, err := http.NewRequestWithContext(ctx, "POST", "http://localhost:5173/api/v1/private/spans", body)
	if err != nil {
		panic(err)
	}
	req.Header.Set("Content-Type", "application/json")
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()
}

<?php
$request = curl_init("http://localhost:5173/api/v1/private/spans");
curl_setopt($request, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($request, CURLOPT_POSTFIELDS, "{\"end_time\":\"2026-06-09T00:00:00Z\",\"environment\":\"string\",\"error_info\":{\"exception_type\":\"string\",\"message\":\"string\",\"traceback\":\"string\"},\"id\":\"00000000-0000-0000-0000-000000000000\",\"input\":{},\"last_updated_at\":\"2026-06-09T00:00:00Z\",\"metadata\":{},\"model\":\"string\",\"name\":\"string\",\"output\":{},\"parent_span_id\":\"00000000-0000-0000-0000-000000000000\",\"project_name\":\"string\",\"provider\":\"string\",\"source\":\"evaluator\",\"start_time\":\"2026-06-09T00:00:00Z\",\"tags\":[\"string\"],\"total_estimated_cost\":0,\"total_estimated_cost_version\":\"string\",\"trace_id\":\"00000000-0000-0000-0000-000000000000\",\"ttft\":0,\"type\":\"general\",\"usage\":{\"additionalProp1\":0}}");
curl_setopt($request, CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
$response = curl_exec($request);
curl_close($request);

var request = HttpRequest.newBuilder(URI.create("http://localhost:5173/api/v1/private/spans"))
    .method("POST", HttpRequest.BodyPublishers.noBody())
    .header("Content-Type", "application/json")
    .method("POST", HttpRequest.BodyPublishers.ofString("{\"end_time\":\"2026-06-09T00:00:00Z\",\"environment\":\"string\",\"error_info\":{\"exception_type\":\"string\",\"message\":\"string\",\"traceback\":\"string\"},\"id\":\"00000000-0000-0000-0000-000000000000\",\"input\":{},\"last_updated_at\":\"2026-06-09T00:00:00Z\",\"metadata\":{},\"model\":\"string\",\"name\":\"string\",\"output\":{},\"parent_span_id\":\"00000000-0000-0000-0000-000000000000\",\"project_name\":\"string\",\"provider\":\"string\",\"source\":\"evaluator\",\"start_time\":\"2026-06-09T00:00:00Z\",\"tags\":[\"string\"],\"total_estimated_cost\":0,\"total_estimated_cost_version\":\"string\",\"trace_id\":\"00000000-0000-0000-0000-000000000000\",\"ttft\":0,\"type\":\"general\",\"usage\":{\"additionalProp1\":0}}"))
    .build();
var response = HttpClient.newHttpClient().send(request, HttpResponse.BodyHandlers.ofString());

require 'net/http'

uri = URI("http://localhost:5173/api/v1/private/spans")
request = Net::HTTPGenericRequest.new("POST", true, true, uri)
request['Content-Type'] = 'application/json'
request.body = "{\"end_time\":\"2026-06-09T00:00:00Z\",\"environment\":\"string\",\"error_info\":{\"exception_type\":\"string\",\"message\":\"string\",\"traceback\":\"string\"},\"id\":\"00000000-0000-0000-0000-000000000000\",\"input\":{},\"last_updated_at\":\"2026-06-09T00:00:00Z\",\"metadata\":{},\"model\":\"string\",\"name\":\"string\",\"output\":{},\"parent_span_id\":\"00000000-0000-0000-0000-000000000000\",\"project_name\":\"string\",\"provider\":\"string\",\"source\":\"evaluator\",\"start_time\":\"2026-06-09T00:00:00Z\",\"tags\":[\"string\"],\"total_estimated_cost\":0,\"total_estimated_cost_version\":\"string\",\"trace_id\":\"00000000-0000-0000-0000-000000000000\",\"ttft\":0,\"type\":\"general\",\"usage\":{\"additionalProp1\":0}}"
response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }

using var client = new HttpClient();
using var request = new HttpRequestMessage(HttpMethod.Post, "http://localhost:5173/api/v1/private/spans");
request.Content = new StringContent("{\"end_time\":\"2026-06-09T00:00:00Z\",\"environment\":\"string\",\"error_info\":{\"exception_type\":\"string\",\"message\":\"string\",\"traceback\":\"string\"},\"id\":\"00000000-0000-0000-0000-000000000000\",\"input\":{},\"last_updated_at\":\"2026-06-09T00:00:00Z\",\"metadata\":{},\"model\":\"string\",\"name\":\"string\",\"output\":{},\"parent_span_id\":\"00000000-0000-0000-0000-000000000000\",\"project_name\":\"string\",\"provider\":\"string\",\"source\":\"evaluator\",\"start_time\":\"2026-06-09T00:00:00Z\",\"tags\":[\"string\"],\"total_estimated_cost\":0,\"total_estimated_cost_version\":\"string\",\"trace_id\":\"00000000-0000-0000-0000-000000000000\",\"ttft\":0,\"type\":\"general\",\"usage\":{\"additionalProp1\":0}}", Encoding.UTF8, "application/json");
using var response = await client.SendAsync(request);

(no response body — HTTP 201)

{
  "code": 0,
  "details": "string",
  "message": "string"
}