> ## Documentation Index > Fetch the complete documentation index at: https://docs.ornn.com/llms.txt > Use this file to discover all available pages before exploring further. # Buy Market windows > Buys one or more windows of relisted capacity at the asking price. There is no offer and no seller approval: every leg is bought together or none are. Each leg becomes its own reservation, returned as reservationId. Read the listing first. Choose a reserved term whose duration bounds allow your window (a shorter window is allowed when it ends exactly at the listing's end) and send its listingTermId and pricePerGpuHourMicroUsd as askPricePerGpuHourMicroUsd. Use whole-second times; windows can start up to five minutes in the past. Payment is up front. A reservation under $10,000 is charged at once from Ornn credits, then your saved card; if that charge fails, the purchase is cancelled and the window returns to the Market. A reservation of $10,000 or more is invoiced by wire and is held until paid. Poll GET /commerce/reservations/{reservationId}: status moves from awaiting_payment to confirmed, then active when the window starts. The reservation can take a moment to appear. Requires Idempotency-Key. Available to every member of your organization; approval is not required. You cannot buy your own organization's listings. Send a new `Idempotency-Key` for each purchase. If the response is lost, retry with the same key and body to get the original result instead of buying twice. `ornn schedules buy` does not send a term or node count, so it works only on listings without `terms` and always buys every node. Use this endpoint for listings with terms. See [Buy relisted capacity](/guides/secondary-market#use-the-api). ## OpenAPI ````yaml openapi.yaml POST /v1/markets/schedules/purchases openapi: 3.1.0 info: title: Ornn compute API version: 1.0.0 description: >- Customer HTTP API for Ornn GPU capacity. It covers reserved capacity and nodes, VM and Bare Metal access, Kubernetes and Slurm clusters, SSH keys, storage volumes and GitHub repositories, private networks, monitoring, buying and selling capacity (Reserve, Market, Spot, and Relist), and billing. API keys are scoped to one organization and act with their creator's access there; account, team, and API-key management stay in the console. Most operations require an approved organization. See https://docs.ornn.com/api-keys to create a key and https://docs.ornn.com/guides/kubernetes-api for an end-to-end Kubernetes integration. Examples use fictional IDs and credentials. The info.version field identifies the contract revision, not a shared API path version. contact: email: support@ornn.com servers: - url: https://api.ornn.com description: Production security: - OrnnApiKey: [] tags: - name: Authentication - name: Reservations - name: GPU nodes - name: Clusters - name: Workers - name: Virtual machines description: >- Choose a VM disk, launch VM access on a reservation, and read each VM's status, launch progress, and SSH connection details. - name: Bare Metal description: >- Launch Bare Metal access on a reservation, read a host's readiness and SSH connection details, and reboot or hard reset it. - name: SSH keys description: >- Register public keys for your organization, choose which keys a VM or Bare Metal reservation uses, and queue key delivery to machines. Slurm clusters take organization key IDs at launch. Kubernetes API access does not use SSH keys. - name: Reserve description: >- Browse reserved-capacity listings and their terms, and post, cancel, or accept offers. Reserve listings are visible to approved organizations. - name: Market description: >- Browse relisted capacity and buy windows at the asking price, paid up front. Open to every member of your organization. - name: Spot description: >- Hourly order books for VMs with 1, 2, 4, or 8 GPUs on one node: read books, trades, and quotes, place and cancel bids, and follow fills. - name: Relist description: >- Sell whole nodes from a reservation you hold at your asking price, and manage those listings. - name: Storage description: >- Managed volumes, their files, and GitHub repository pulls. Volumes belong to the API key's creator in the key's organization. - name: Networks description: >- Organization private networks and the WireGuard configs you use to reach private machines and clusters. - name: Monitoring description: >- Machine telemetry and console logs for capacity your organization holds. Reads are limited to your reservation window. - name: Billing description: >- Invoices, billing summary, usage cost, Ornn credits, and account statements. Saving a card and paying invoices stay in the console. externalDocs: description: REST integration walkthrough url: >- https://docs.ornn.com/guides/kubernetes-access#provision-and-manage-through-rest paths: /v1/markets/schedules/purchases: post: tags: - Market summary: Buy Market windows description: >- Buys one or more windows of relisted capacity at the asking price. There is no offer and no seller approval: every leg is bought together or none are. Each leg becomes its own reservation, returned as reservationId. Read the listing first. Choose a reserved term whose duration bounds allow your window (a shorter window is allowed when it ends exactly at the listing's end) and send its listingTermId and pricePerGpuHourMicroUsd as askPricePerGpuHourMicroUsd. Use whole-second times; windows can start up to five minutes in the past. Payment is up front. A reservation under $10,000 is charged at once from Ornn credits, then your saved card; if that charge fails, the purchase is cancelled and the window returns to the Market. A reservation of $10,000 or more is invoiced by wire and is held until paid. Poll GET /commerce/reservations/{reservationId}: status moves from awaiting_payment to confirmed, then active when the window starts. The reservation can take a moment to appear. Requires Idempotency-Key. Available to every member of your organization; approval is not required. You cannot buy your own organization's listings. operationId: capacityBuyWindows parameters: - name: Idempotency-Key in: header required: true description: >- Required. A unique key of 1 to 200 characters for this operation, such as a UUID. Retrying with the same key and the same body returns the original result with HTTP 200 instead of creating a second one. The key is remembered for 24 hours per organization; reusing it for a different request returns 409 idempotency_conflict. A missing key returns 400 idempotency_key_required. schema: type: string minLength: 1 maxLength: 200 example: 3f1c2a9e-6b1d-4c55-9a77-0d2b8f1e4c10 requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/CapacityPurchaseRequest' example: legs: - listingId: eeeeeeee-eeee-4eee-8eee-eeeeeeeeeeee listingTermId: 88888888-8888-4888-8888-888888888888 nodeCount: 1 startsAt: '2026-10-24T00:00:00Z' endsAt: '2026-10-27T00:00:00Z' askPricePerGpuHourMicroUsd: 4200000 responses: '200': description: >- A retry with the same Idempotency-Key and body; returns the original purchases. content: application/json: schema: $ref: '#/components/schemas/CapacityPurchaseList' example: purchases: - reservationId: dddddddd-dddd-4ddd-8ddd-dddddddddddd listingId: eeeeeeee-eeee-4eee-8eee-eeeeeeeeeeee nodeCount: 1 startsAt: '2026-10-24T00:00:00.000Z' endsAt: '2026-10-27T00:00:00.000Z' askPricePerGpuHourMicroUsd: 4200000 '201': description: Windows bought. Each purchase is a reservation awaiting payment. content: application/json: schema: $ref: '#/components/schemas/CapacityPurchaseList' example: purchases: - reservationId: dddddddd-dddd-4ddd-8ddd-dddddddddddd listingId: eeeeeeee-eeee-4eee-8eee-eeeeeeeeeeee nodeCount: 1 startsAt: '2026-10-24T00:00:00.000Z' endsAt: '2026-10-27T00:00:00.000Z' askPricePerGpuHourMicroUsd: 4200000 '400': description: >- Missing Idempotency-Key, no legs, more than 50 legs, or an invalid body. content: application/json: schema: $ref: '#/components/schemas/Error' example: detail: code: idempotency_key_required message: Send an Idempotency-Key header with this request. '401': $ref: '#/components/responses/Unauthorized' '403': description: The listing belongs to your organization. content: application/json: schema: $ref: '#/components/schemas/Error' example: detail: code: cannot_buy_own_listing message: You cannot buy your own listing. '404': description: The listing is not tradable. content: application/json: schema: $ref: '#/components/schemas/Error' example: detail: code: schedule_not_found message: Ornn could not find that listing. '409': description: >- The price changed, part of the window sold, the listing closed, or the key was reused. Nothing was bought; read the listing again before retrying with a new key. content: application/json: schema: $ref: '#/components/schemas/Error' example: detail: code: ask_changed message: >- The asking price changed. Review the new price and try again. '422': description: >- The window, term, duration, or node count is not valid for the listing. Codes include invalid_listing_term, invalid_duration, invalid_window, purchase_too_short, purchase_in_past, purchase_outside_listing, invalid_node_count, purchase_legs_overlap, and primary_sells_by_offer. content: application/json: schema: $ref: '#/components/schemas/Error' example: detail: code: invalid_listing_term message: Choose an available listing term. default: $ref: '#/components/responses/Error' components: schemas: CapacityPurchaseRequest: type: object required: - legs additionalProperties: false properties: legs: type: array minItems: 1 maxItems: 50 description: >- Windows to buy together. All legs succeed or none do; legs may not overlap. items: $ref: '#/components/schemas/CapacityPurchaseLeg' CapacityPurchaseList: type: object required: - purchases properties: purchases: type: array items: $ref: '#/components/schemas/CapacityPurchase' Error: type: object properties: code: type: string detail: oneOf: - type: string - type: object required: - code - message properties: code: type: string message: type: string CapacityPurchaseLeg: type: object required: - listingId - startsAt - endsAt - askPricePerGpuHourMicroUsd additionalProperties: false properties: listingId: type: string format: uuid description: A Market (secondary) listing. listingTermId: type: string format: uuid description: >- Required when the listing has terms: a reserved term whose duration bounds allow this window. nodeCount: type: integer minimum: 1 description: Nodes to buy. Omitted buys every node on the listing. startsAt: type: string format: date-time description: Whole-second RFC 3339 start inside the listing, now or later. endsAt: type: string format: date-time description: >- Whole-second RFC 3339 end inside the listing, at least one hour after the start. askPricePerGpuHourMicroUsd: type: integer format: int64 description: >- The price you were shown: the selected term's pricePerGpuHourMicroUsd from the schedule, or askPricePerGpuHourMicroUsd when the listing has no terms. A changed price refuses the purchase with ask_changed. CapacityPurchase: type: object required: - reservationId - listingId - startsAt - endsAt properties: reservationId: type: string format: uuid description: The reservation this leg creates. listingId: type: string format: uuid nodeCount: type: - integer - 'null' startsAt: type: - string - 'null' format: date-time endsAt: type: - string - 'null' format: date-time askPricePerGpuHourMicroUsd: type: - integer - 'null' format: int64 description: What you pay per GPU-hour, fees included. responses: Unauthorized: description: >- The credential is missing, invalid, revoked, or no longer belongs to a current organization member. Check the HTTP status before parsing the body. content: application/json: schema: $ref: '#/components/schemas/Error' Error: description: >- Unsuccessful request. Check HTTP status first. Errors may have detail.code/detail.message, a string detail and optional top-level code, or an empty/non-JSON body. 401: invalid credential; 403: access or approval required; 404: not visible or credentials not ready; 409: lifecycle conflict; 429: back off; 5xx: service failure. Inspect current state before retrying mutations. content: application/json: schema: $ref: '#/components/schemas/Error' securitySchemes: OrnnApiKey: type: http scheme: bearer bearerFormat: ornn_sk_... description: >- Create an organization API key in Account Settings > Developer. Do not send this key to the Kubernetes API server. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.