# POST /api/v1/jobs/{id}/budget-extension

Append funded budget amendment (renter owner)

Operation: `extendJobBudget`.

Append funded budget amendment (renter owner)

Idempotent. Appends one immutable amendment plus hold atomically; keeps original rate and snapshotted host-availability ceiling; bumps budget_version. Rejects once STOPPING begins. D-16 — budget_version changes only with a committed funding amendment.

## Endpoint

`POST https://amplerun-api.spiry.org/api/v1/jobs/{id}/budget-extension`

## Authentication

Use the credential and scope required by this operation. For programmatic renter/host calls: `Authorization: Bearer $AMPLERUN_API_KEY`. A host-agent signature or other specialized proof is required where the description specifies it.

## Parameters

| Name | Location | Presence | Type | Description |
| --- | --- | --- | --- | --- |
| `id` | path | Required | UUID |  |
| `Idempotency-Key` | header | Required | UUID | UUID scoped to authenticated principal, route and canonical request hash. |

## Request body

Required body. 

### `application/json`

| Field | Type | Presence | Description |
| --- | --- | --- | --- |
| `additional_budget_micro` | MicroAmount | Required |  |
| `new_duration_limit_s` | integer | Required |  |
| `expected_job_version` | DecimalString | Required |  |
| `expected_budget_version` | DecimalString | Required |  |

```json
{
  "type": "object",
  "additionalProperties": false,
  "required": [
    "additional_budget_micro",
    "new_duration_limit_s",
    "expected_job_version",
    "expected_budget_version"
  ],
  "properties": {
    "additional_budget_micro": {
      "$ref": "#/components/schemas/MicroAmount"
    },
    "new_duration_limit_s": {
      "type": "integer",
      "minimum": 1
    },
    "expected_job_version": {
      "$ref": "#/components/schemas/DecimalString"
    },
    "expected_budget_version": {
      "$ref": "#/components/schemas/DecimalString"
    }
  }
}
```

## Responses

### `202`

Amendment committed; returns new budget_version.

`application/json`
| Field | Type | Presence | Description |
| --- | --- | --- | --- |
| `job_id` | UUID | Required |  |
| `budget_version` | DecimalString | Required |  |
| `funded_budget_micro` | MicroAmount | Required |  |

```json
{
  "type": "object",
  "required": [
    "job_id",
    "budget_version",
    "funded_budget_micro"
  ],
  "properties": {
    "job_id": {
      "$ref": "#/components/schemas/UUID"
    },
    "budget_version": {
      "$ref": "#/components/schemas/DecimalString"
    },
    "funded_budget_micro": {
      "$ref": "#/components/schemas/MicroAmount"
    }
  }
}
```

### `default`

Error envelope. 401 unauthenticated, 403/404 forbidden, 409 conflict, 422 invalid input, 429 rate limited (code UNAVAILABLE, retryable:true, no Retry-After header), 503 unavailable money/provider state with retryable:true.

`application/json`
| Field | Type | Presence | Description |
| --- | --- | --- | --- |
| `error` | object | Required |  |

```json
{
  "$ref": "#/components/schemas/ErrorEnvelope"
}
```

## Static request outline

Replace path/query placeholders and provide the required JSON body, headers and credential from the sections above. This is a request outline, not a command that chooses an amount or starts a rental for you.

```sh
curl --request POST 'https://amplerun-api.spiry.org/api/v1/jobs/{id}/budget-extension' \
  --header "Authorization: Bearer $AMPLERUN_API_KEY"
```

[Schema definitions](https://docs.amplerun.com/reference/schemas.md) · [Download OpenAPI](/openapi.json) · [Authentication](https://docs.amplerun.com/agents/authentication.md) · [Errors and recovery](https://docs.amplerun.com/reference/errors.md)

---
Generated from the AmpleRun API contract.
Canonical: https://docs.amplerun.com/reference/api/extend-job-budget/