> ## Documentation Index > Fetch the complete documentation index at: https://docs.superx.so/llms.txt > Use this file to discover all available pages before exploring further. # List contact lists > The selected account's contact lists: system lists first (Followers, Following, Repliers, Reposters; `is_system: true` with a `kind`), then lists you created, newest first. System lists are read-only and index-only: their members are not readable through the API and `member_count` is 0 for them. ## OpenAPI ````yaml /api-reference/openapi.yaml get /v1/contact-lists openapi: 3.1.0 info: title: SuperX API version: 1.0.0 description: > The SuperX public API: your Twitter/X content, analytics, audience and scheduling data over REST. All endpoints require an API key (`Authorization: Bearer sxk_...`) except `GET /v1/docs`. Keys are created in the SuperX app under Account > API / MCP / CLI and are server-side secrets. Timestamps are UTC ISO-8601 in both directions; inputs must carry an explicit `Z` or numeric offset. Every authenticated response carries `X-RateLimit-Limit`, `X-RateLimit-Remaining` and `X-RateLimit-Reset` headers. contact: name: SuperX url: https://superx.so servers: - url: https://api.superx.so security: - apiKey: [] tags: - name: Identity - name: Content - name: Analytics - name: Inspiration - name: Audience - name: Contact Lists - name: Signals - name: Media - name: Scheduling - name: Tags - name: Context - name: Queue - name: Articles - name: Meta paths: /v1/contact-lists: get: tags: - Contact Lists summary: List contact lists description: | The selected account's contact lists: system lists first (Followers, Following, Repliers, Reposters; `is_system: true` with a `kind`), then lists you created, newest first. System lists are read-only and index-only: their members are not readable through the API and `member_count` is 0 for them. operationId: listContactLists parameters: - $ref: '#/components/parameters/AccountId' responses: '200': description: The account's contact lists. headers: X-RateLimit-Limit: $ref: '#/components/headers/X-RateLimit-Limit' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' content: application/json: schema: type: object properties: data: type: array items: $ref: '#/components/schemas/ContactList' example: data: - id: sys_f1a2b3c4d5e6f7g8h9i0j name: Followers is_system: true kind: followers member_count: 0 created_at: '2026-05-01T09:00:00.000Z' updated_at: '2026-05-01T09:00:00.000Z' - id: k1l2m3n4o5p6q7r8s9t0u name: Founder prospects is_system: false kind: null member_count: 42 created_at: '2026-06-20T14:30:00.000Z' updated_at: '2026-07-01T08:15:00.000Z' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/SubscriptionRequired' '404': $ref: '#/components/responses/AccountNotFound' '429': $ref: '#/components/responses/RateLimited' '502': $ref: '#/components/responses/UpstreamError' '503': $ref: '#/components/responses/UpstreamUnavailable' components: parameters: AccountId: name: account_id in: query required: false description: >- Account to act on, from `GET /v1/accounts`. Defaults to your main account. An id outside your accounts returns `404 account_not_found`. schema: type: string headers: X-RateLimit-Limit: description: The limit of the rate window closest to exhaustion. schema: type: integer X-RateLimit-Remaining: description: Requests remaining in that window. schema: type: integer X-RateLimit-Reset: description: Unix timestamp (seconds) when that window resets. schema: type: integer schemas: ContactList: type: object properties: id: type: string name: type: string is_system: type: boolean kind: type: string nullable: true enum: - followers - following - repliers - reposters - null description: Set on system lists only. member_count: type: integer description: >- Members in the list. Always 0 for system lists (their membership is maintained automatically and is not exposed here). created_at: type: string format: date-time nullable: true updated_at: type: string format: date-time nullable: true ErrorEnvelope: type: object required: - error properties: error: type: object required: - code - message properties: code: type: string description: Stable machine-readable error code. message: type: string retry_after: type: integer description: Seconds to wait before retrying (rate-limit errors only). LegacyErrorEnvelope: type: object required: - error description: | Legacy shape used ONLY by the shared subscription middleware: a plain string `error` field. Seen on `403` when the subscription has lapsed (string starts with "subscription_required:") and on `500` when subscription verification fails (string starts with "internal_error:"). properties: error: type: string example: >- subscription_required: The SuperX API requires an active subscription responses: Unauthorized: description: >- Missing/malformed Authorization header (`unauthorized`) or an unknown/revoked key (`invalid_api_key`). content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: invalid_api_key message: Unknown or revoked API key SubscriptionRequired: description: | Subscription lapsed. NOTE the legacy body shape: `error` is a plain string here, not the `{ code, message }` object. Read-only keys on write endpoints instead get the object envelope with code `insufficient_scope`. content: application/json: schema: oneOf: - $ref: '#/components/schemas/LegacyErrorEnvelope' - $ref: '#/components/schemas/ErrorEnvelope' example: error: >- subscription_required: The SuperX API requires an active subscription AccountNotFound: description: account_id is not one of your accounts. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: account_not_found message: No account with that id belongs to this key RateLimited: description: Rate limit exceeded (limits vary by plan). Honor Retry-After. headers: Retry-After: description: Seconds to wait before retrying. schema: type: integer X-RateLimit-Limit: $ref: '#/components/headers/X-RateLimit-Limit' X-RateLimit-Remaining: $ref: '#/components/headers/X-RateLimit-Remaining' X-RateLimit-Reset: $ref: '#/components/headers/X-RateLimit-Reset' content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: rate_limited message: >- Rate limit exceeded for the Pro plan (30 requests/min). Upgrade for higher limits. retry_after: 42 UpstreamError: description: A dependent SuperX service returned an unexpected response. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: upstream_error message: Failed to fetch scheduled posts. Try again shortly. UpstreamUnavailable: description: >- The scheduling service is temporarily unreachable. Safe to retry; reuse your Idempotency-Key on POST. content: application/json: schema: $ref: '#/components/schemas/ErrorEnvelope' example: error: code: upstream_unavailable message: >- The scheduling service is temporarily unavailable. Retry with the same Idempotency-Key. securitySchemes: apiKey: type: http scheme: bearer description: >- A SuperX API key ("sxk_..."), created in the SuperX app under Account > API / MCP / CLI. Keys are server-side secrets. ````