> ## Documentation Index > Fetch the complete documentation index at: https://docs.sailresearch.com/llms.txt > Use this file to discover all available pages before exploring further. # Get a checkpoint > Returns one checkpoint. An expired or deleted checkpoint is not found. ## OpenAPI ````yaml /sailbox-openapi.json get /sailbox-checkpoints/{checkpoint_id} openapi: 3.1.0 info: title: Sail Sailbox API version: '2026-09-07' description: >- Create and operate Sailboxes over HTTP. Sailboxes are fast-booting virtual machines that you can pause, resume, and checkpoint. Run commands, stream files, manage lifecycle and networking, and inspect usage. Turning on SSH and building an image still require an SDK or the CLI. See the [HTTP API guide](/sailboxes-http-api). servers: - url: https://sailbox-api.sailresearch.com/v1 security: - BearerAuth: [] tags: - name: Apps description: Groups that own Sailboxes. One app per workload. - name: Lifecycle description: >- A Sailbox's whole life: create it, watch it, stop and start it, terminate it. - name: Checkpoints description: Save a Sailbox to start from later, and copy a running one. - name: Exec description: Run commands and control their standard input and terminals. - name: Files description: Stream regular files into and out of a Sailbox. - name: Networking description: >- Publish ports, serve them on hostnames you own, and identify a Sailbox to other Sailboxes. - name: Secrets description: >- Organization values that egress policy rules can add to matching requests. Sail never returns a stored value. - name: Egress policies description: >- What a Sailbox may connect to, and what happens to the HTTPS requests it sends. - name: Volumes description: >- Shared storage that outlives any one Sailbox. Alpha: these endpoints can still change. - name: SSH access description: Certificates for connecting to a Sailbox with `ssh`. - name: Usage description: Resource usage and spend. - name: Identity description: Who your API key belongs to. paths: /sailbox-checkpoints/{checkpoint_id}: get: tags: - Checkpoints summary: Get a checkpoint description: Returns one checkpoint. An expired or deleted checkpoint is not found. operationId: getCheckpoint parameters: - name: checkpoint_id in: path required: true schema: type: string responses: '200': description: Success. content: application/json: schema: $ref: '#/components/schemas/Checkpoint' '401': description: The API key is missing or invalid. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: message: Invalid API key type: authentication_error param: null code: invalid_api_key '402': description: >- The organization is out of credits. The error carries a `billing_url` pointing at the page where you add them. Retry once you have. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: message: >- Your API key has been disabled due to insufficient credits. Visit https://app.sailresearch.com/billing to add credits. type: billing_error param: null code: credits_exhausted billing_url: https://app.sailresearch.com/billing '403': description: The API key is not allowed to perform this operation. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: message: sailboxes require an organization-scoped API key type: permission_error param: null code: null '404': description: No such checkpoint. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: message: sailbox "sb_9c8f1e2a-3b4d-4f5a-8c7e-1d2f3a4b5c6d" not found type: not_found_error param: null code: null '429': description: >- Too many requests in flight, or the organization is at a limit. A `Retry-After` header means the request never started, so retry it unchanged after that delay. Without one, the request ran and hit the limit `message` names. Some of those clear on their own, such as a shortage of public ports; others need you to free something up first. Send the request again once the cause is gone. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: message: >- Too many concurrent requests. Please retry after some of your organization's in-flight requests complete. type: rate_limit_error param: null code: rate_limited headers: Retry-After: $ref: '#/components/headers/RetryAfter' '500': description: Server error. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: message: failed to fetch sailbox type: server_error param: null code: null '503': description: >- Sail is momentarily unavailable. Retry after the delay in the `Retry-After` header when one is present, and with backoff otherwise. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: message: Authentication service unavailable type: server_error param: null code: null headers: Retry-After: $ref: '#/components/headers/RetryAfter' components: schemas: Checkpoint: type: object properties: checkpoint_id: type: string description: Id to pass when starting a Sailbox from this checkpoint. name: type: - string - 'null' description: The checkpoint's name, or null if it was not given one. sailbox_id: type: string description: Sailbox the checkpoint was taken from. app_id: type: string description: App of the Sailbox the checkpoint was taken from. checkpoint_generation: type: integer description: >- The Sailbox's checkpoint counter as of this checkpoint. It goes up by one every time the Sailbox saves its state, which includes pausing and sleeping. format: int64 created_at: type: string format: date-time expires_at: type: - string - 'null' format: date-time description: >- When the checkpoint expires. Starting a Sailbox from it after that fails. required: - checkpoint_id - name - sailbox_id - app_id - checkpoint_generation - created_at - expires_at ErrorResponse: type: object required: - error properties: error: $ref: '#/components/schemas/ErrorObject' ErrorObject: type: object required: - message - type - param - code properties: message: type: string description: Human-readable description of what went wrong. type: type: string description: >- Error category: `invalid_request_error`, `authentication_error`, `permission_error`, `billing_error`, `not_found_error`, `conflict_error`, `rate_limit_error`, `quota_exceeded_error`, `not_implemented_error`, or `server_error`. param: oneOf: - type: string - type: 'null' description: >- The request field the error refers to, when the error is about one field. code: oneOf: - type: string - type: integer - type: 'null' description: >- Stable short code for the error, when one applies. Errors relayed from the Sailbox runtime carry its status token, for example `already_exists` or `failed_precondition` on a 409, which the HTTP status alone does not distinguish. billing_url: type: string format: uri description: Page where you add credits. Sent with a 402. additionalProperties: true headers: RetryAfter: description: >- How many seconds to wait before retrying. On a 429 it also means the request never started, so the retry can reuse the same `Idempotency-Key`. schema: type: integer minimum: 0 securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: API Key ````