> ## Documentation Index
> Fetch the complete documentation index at: https://api.csboard.com/llms.txt
> Use this file to discover all available pages before exploring further.

# GET /v1/listings/availability — Bulk Availability Check

> Check whether up to 100 CSBoard listings are still buyable in a single request, with per-id available counts and a list of unavailable ids.

Before placing a batch order, confirm the listings you intend to buy are still available. Pass up to 100 listing ids as a comma-separated `ids` parameter; the response tells you how many of each id are currently available and which ids are gone.

**Authentication required.** Send your key as `Authorization: Bearer csb_pub_...`.

## Query parameters

<ParamField query="ids" type="string" required>
  Comma-separated listing ids, e.g. `itm_8841201,itm_8841340`. **Required.** Maximum 100 ids per request.
</ParamField>

## Response fields

<ResponseField name="data" type="object" required>
  <Expandable title="data object">
    <ResponseField name="available" type="object" required>
      Map of listing id → integer count currently available. Ids with at least one available unit appear here.
    </ResponseField>

    <ResponseField name="unavailable_ids" type="string[]" required>
      Listing ids that are no longer available.
    </ResponseField>
  </Expandable>
</ResponseField>

## Example request

```bash theme={null}
curl "https://csboard.com/v1/listings/availability?ids=itm_8841201,itm_8841340,itm_8841999" \
  -H "Authorization: Bearer csb_pub_..."
```

## Example response

```json theme={null}
{
  "data": {
    "available": {
      "itm_8841201": 1,
      "itm_8841340": 3
    },
    "unavailable_ids": ["itm_8841999"]
  }
}
```

## Error codes

| HTTP status | Code                                  | Meaning                                                         |
| ----------- | ------------------------------------- | --------------------------------------------------------------- |
| 401         | `missing_api_key` / `invalid_api_key` | Missing or invalid API key.                                     |
| 422         | `invalid_request`                     | `ids` was omitted, or more than 100 ids were supplied.          |
| 429         | `rate_limit_exceeded`                 | Too many requests. Back off for the `Retry-After` header value. |

<Tip>
  Availability is a point-in-time snapshot. An id reported as available can still sell out before your purchase executes — always send `max_price_usd` and handle `item_unavailable` on the buy call.
</Tip>


## OpenAPI

````yaml GET /listings/availability
openapi: 3.1.0
info:
  title: CSBoard API
  version: 1.0.0
  description: >-
    Market data over the CSBoard marketplace — live listings, floats, stickers,
    minAsk prices, FX rates — plus opt-in buying straight from your balance.
    Free to read, key-gated, built for automation.
  contact:
    name: CSBoard
    url: https://csboard.com/docs
servers:
  - url: https://csboard.com/v1
    description: Production
security:
  - bearerAuth: []
tags:
  - name: Status
    description: Liveness and freshness probes.
  - name: Market data
    description: Read the live catalog, prices, and FX rates.
  - name: Trading
    description: Buy listings from your CSBoard balance. Opt-in, key-gated.
  - name: Account
    description: Your balance, settled funds, and trading status.
paths:
  /listings/availability:
    get:
      tags:
        - Market data
      summary: Bulk availability check
      description: >-
        Check whether specific listings are still buyable, in one request. Pass
        up to 100 listing ids as a comma-separated `ids` query parameter.
        Returns how many of each id are available, plus the ids that are no
        longer available.
      operationId: getListingsAvailability
      parameters:
        - name: ids
          in: query
          required: true
          description: Comma-separated listing ids. Required. Maximum 100 ids per request.
          schema:
            type: string
      responses:
        '200':
          description: Availability map for the requested ids.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      available:
                        type: object
                        additionalProperties:
                          type: integer
                        description: Map of listing id → count currently available.
                      unavailable_ids:
                        type: array
                        items:
                          type: string
                        description: Ids that are no longer available.
                    required:
                      - available
                      - unavailable_ids
                required:
                  - data
              example:
                data:
                  available:
                    itm_8841201: 1
                    itm_8841340: 3
                  unavailable_ids:
                    - itm_8841999
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          description: Invalid request — `ids` missing or more than 100 ids supplied.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
              example:
                code: invalid_request
                detail: Provide between 1 and 100 ids in the ids parameter.
        '429':
          $ref: '#/components/responses/RateLimited'
components:
  responses:
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            code: unauthorized
            message: Missing or invalid API key.
    RateLimited:
      description: Rate limit exceeded. Includes a Retry-After header.
      headers:
        Retry-After:
          description: Seconds to wait before retrying.
          schema:
            type: integer
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
          example:
            code: rate_limit_exceeded
            message: Too many requests.
  schemas:
    Error:
      type: object
      description: >-
        All errors return { code, detail }. Some carry extra fields (e.g.
        price_moved adds current_total_usd, insufficient_balance adds
        required_usd/current_usd).
      properties:
        code:
          type: string
          description: >-
            Machine-readable error code, e.g. rate_limit_exceeded,
            trading_not_enabled, price_moved.
        detail:
          type: string
          description: Human-readable explanation.
      required:
        - code
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        Send your key as a Bearer token on every request: `Authorization: Bearer
        csb_pub_...`. Generate keys in your CSBoard profile.

````