---
title: "Call Start Batch"
method: POST
path: "/call/upsert_batch"
tags: ["Calls"]
---

# Call Start Batch

`POST /call/upsert_batch`

## Request body

- CallCreateBatchReq
  - `batch` union[], required
    - union
      - CallBatchStartMode
        - `mode` string
        - `req` CallStartReq, required
          - `start` StartedCallSchemaForInsert, required
            - `project_id` string, required
            - `id` string, nullable
            - `op_name` string, required
            - `display_name` string, nullable
            - `trace_id` string, nullable
            - `parent_id` string, nullable
            - `thread_id` string, nullable
            - `turn_id` string, nullable
            - `started_at` string, date-time, required
            - `attributes` object, required
            - `inputs` object, required
            - `otel_dump` object, nullable
            - `wb_user_id` string, nullable — Do not set directly. Server will automatically populate this field.
            - `wb_run_id` string, nullable
            - `wb_run_step` integer, nullable
      - CallBatchEndMode
        - `mode` string
        - `req` CallEndReq, required
          - `end` EndedCallSchemaForInsert, required
            - `project_id` string, required
            - `id` string, required
            - `ended_at` string, date-time, required
            - `exception` string, nullable
            - `output` unknown
            - `summary` SummaryInsertMap, required
              - …
            - `wb_run_step_end` integer, nullable

## Response `200`

Successful Response

- CallCreateBatchRes
  - `res` union[], required
    - union
      - CallStartRes
        - `id` string, required
        - `trace_id` string, required
      - CallEndRes

## Other responses

- `422` — Validation Error

---

[API](https://skmtc.net/wandb/apis/fastapi.md) · [All operations](https://skmtc.net/wandb/apis/fastapi/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/wandb/fastapi/versions/56745769989b/schema)