> ## Documentation Index > Fetch the complete documentation index at: https://commet.co/docs/llms.txt > Use this file to discover all available pages before exploring further. # List plan experiments > List a plan's experiments, newest first, with the version each one sells and how many subscriptions are on them. List a plan's experiments, newest first, with the version each one sells and how many subscriptions are on them. ## OpenAPI ````yaml /openapi/es/rest/2026-08-27.json get /plans/{id}/experiments openapi: 3.1.0 info: title: Commet API version: '2026-08-27' description: Billing and payments API for SaaS and AI products. servers: - url: https://commet.co/api/v1 security: - ApiKeyAuth: [] tags: - name: Test Clock description: >- Simulate the passage of time in sandbox to test billing flows. Mirrors Stripe test clocks: forward-only and sandbox-only. - name: Customers - name: Subscriptions - name: Plans - name: Markets description: >- Reusable country groups for market-specific prices and selectable price variants. - name: Offers - name: Promo Codes - name: Features - name: Usage - name: Seats - name: Quota - name: Add-ons - name: Portal - name: Credit Packs - name: Plan Groups - name: Invoices - name: Payments description: >- One-time payments with no subscription or plan. Charge a customer's saved payment method off-session, or create a payment link the customer opens to pay. Tax, invoice, and receipt are handled automatically. - name: Transactions - name: Webhooks - name: API Keys - name: Payouts description: >- Withdraw available balance to your bank and manage the payout account (verification + destination bank accounts). - name: Provisioning description: >- Take ownership of an organization an agent provisioned headlessly. The agent holds the API keys from the start; a human claims the account through a claim link. paths: /plans/{id}/experiments: get: tags: - Plans summary: List plan experiments description: >- List a plan's experiments, newest first, with the version each one sells and how many subscriptions are on them. operationId: list-plan-experiments parameters: - name: id in: path required: true schema: type: string - name: Commet-Version in: header required: false description: >- API version used by this reference. Send this header to select this contract explicitly. schema: type: string default: '2026-08-27' example: '2026-08-27' responses: '200': description: Success headers: X-Request-Id: $ref: '#/components/headers/RequestId' RateLimit-Limit: description: Maximum number of requests allowed in the current window. schema: type: string RateLimit-Remaining: description: Requests remaining in the current window. schema: type: string content: application/json: schema: type: object properties: object: type: string const: list data: type: array items: $ref: '#/components/schemas/PlanExperiment' hasMore: type: boolean nextCursor: type: string required: - object - data - hasMore additionalProperties: false example: object: list data: - id: pex_1a2b3c4d code: pro:price-test status: running startedFromVersionId: plr_5e6f7g8h latestVersionId: plr_1a2b3c4d sellsVersionId: plr_1a2b3c4d subscriptionCount: 7 createdAt: '2026-09-07T12:00:00.000Z' closedAt: null object: plan_experiment '400': description: Bad request headers: X-Request-Id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: type: validation_error code: validation_error message: The request contains an invalid parameter. doc_url: >- https://commet.co/docs/api-reference/2026-08-27/errors/validation_error.md '401': description: Unauthorized headers: X-Request-Id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: type: authentication_error code: unauthorized message: A valid API key is required. doc_url: >- https://commet.co/docs/api-reference/2026-08-27/errors/unauthorized.md '403': description: Forbidden headers: X-Request-Id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: type: authentication_error code: forbidden message: You do not have permission to perform this operation. doc_url: >- https://commet.co/docs/api-reference/2026-08-27/errors/forbidden.md '404': description: Not found headers: X-Request-Id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: type: not_found_error code: not_found message: The requested resource was not found. doc_url: >- https://commet.co/docs/api-reference/2026-08-27/errors/not_found.md '429': description: Too many requests headers: X-Request-Id: $ref: '#/components/headers/RequestId' RateLimit-Limit: description: Maximum number of requests allowed in the current window. schema: type: string RateLimit-Remaining: description: Requests remaining in the current window. schema: type: string RateLimit-Reset: description: Seconds until the rate limit window resets. schema: type: string Retry-After: description: Seconds to wait before retrying the request. schema: type: string content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: type: rate_limit_error code: rate_limited message: >- Too many requests. Retry after the interval specified in the Retry-After header. doc_url: >- https://commet.co/docs/api-reference/2026-08-27/errors/rate_limited.md '500': description: Internal server error headers: X-Request-Id: $ref: '#/components/headers/RequestId' content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: type: internal_error code: internal_error message: An unexpected error occurred while processing the request. doc_url: >- https://commet.co/docs/api-reference/2026-08-27/errors/internal_error.md components: headers: RequestId: description: >- Server-generated identifier that correlates this response with Platform logs. schema: type: string format: uuid schemas: PlanExperiment: type: object properties: id: type: string description: Public plan experiment ID. code: type: string description: >- The code to sell it with as planCode, such as pro:price-test. It always sells the experiment's latest version while running, and the plan's current version once closed. status: type: string enum: - running - won - archived description: >- running sells its latest version; won became the plan's current version; archived stopped selling. startedFromVersionId: type: string description: The plan's version that was current when it started. latestVersionId: type: string description: Its latest version. sellsVersionId: type: string description: The version its code sells to new buyers today. subscriptionCount: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Active, trialing, past due and paused subscriptions on its versions. createdAt: type: string format: date-time closedAt: anyOf: - type: string format: date-time - type: 'null' object: type: string const: plan_experiment livemode: type: boolean required: - id - code - status - startedFromVersionId - latestVersionId - sellsVersionId - subscriptionCount - createdAt - closedAt - object - livemode additionalProperties: false ErrorResponse: type: object properties: error: type: object properties: type: type: string code: type: string message: type: string param: type: string details: {} doc_url: type: string required: - type - code - message - doc_url additionalProperties: false required: - error additionalProperties: false securitySchemes: ApiKeyAuth: type: apiKey in: header name: x-api-key ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.