> ## Documentation Index > Fetch the complete documentation index at: https://docs.zavu.dev/llms.txt > Use this file to discover all available pages before exploring further. # List channels > Every (address, type) the project can send from, and whether it can send right now. Paginated by sender: a page holds every entry of up to `limit` senders, so it can hold more than `limit` entries. ## OpenAPI ````yaml /api-reference/v2/openapi.json get /v2/channels openapi: 3.0.3 info: title: Zavu API v2 version: 2.0.0 description: >- The second version of the Zavu API. It runs on the same engine as /v1: the same API keys, the same per-project rate limit, the same sending limits, prices and reviews. /v1 keeps working unchanged, and you can mix calls to both. **Addresses, not senders.** /v2 has no sender object. Where a message leaves from is named the way the recipient sees it: an E.164 number, an email address, `@botname` for Telegram, `@username` for Instagram, the Facebook Page id for Messenger, and the literal `sms_oneway` for one-way SMS (sent from shared numbers, never a number of your own). `GET /v2/channels` lists one entry per (address, type); a number that carries WhatsApp and SMS is two entries with the same address. **What else changes.** No `Zavu-Sender` header (`from` or `conversationId` instead); every send reports how it was routed; one project webhook carries every event; every error is `{code, message, details}` at the root. **Wrong method.** A path under `/v2/messages`, `/v2/conversations`, `/v2/contacts`, `/v2/channels`, `/v2/templates`, `/v2/campaigns`, `/v2/agents`, `/v2/webhook` or `/v2/email-domains` called with a method it does not take answers `405 method_not_allowed`, with `details.allowed` and an `Allow` header. **Money.** Every amount is USD, rounded to 6 decimals. servers: - url: https://api.zavu.dev security: - bearerAuth: [] tags: - name: Messages description: Send, list and read messages. - name: Conversations description: Inbox threads, one per contact across channels. - name: Contacts description: Contacts and the identifiers they are reached at. - name: Channels description: 'Where the project can send from: one entry per (address, type).' - name: Templates description: WhatsApp message templates. - name: Campaigns description: One message to many recipients. - name: Webhook description: The one project webhook for every event. - name: Agents description: AI agents and the addresses they answer on. - name: Numbers description: Search and buy phone numbers. - name: Email Domains description: Domains to send email from. - name: Functions description: Configure Zavu Functions. paths: /v2/channels: get: tags: - Channels summary: List channels description: >- Every (address, type) the project can send from, and whether it can send right now. Paginated by sender: a page holds every entry of up to `limit` senders, so it can hold more than `limit` entries. operationId: listChannelsV2 parameters: - name: limit in: query schema: type: integer default: 50 maximum: 100 - name: cursor in: query description: Opaque `nextCursor` from the previous page. schema: type: string responses: '200': description: Entries. content: application/json: schema: type: object required: - items properties: items: type: array items: $ref: '#/components/schemas/ChannelEntry' nextCursor: type: string nullable: true '400': description: '`limit` outside 1–100 (`details.errors`).' content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Unauthorized. content: application/json: schema: $ref: '#/components/schemas/Error' security: - bearerAuth: [] components: schemas: ChannelEntry: type: object required: - address - type - active - v1SenderId description: One place the project can send from, on one transport. properties: address: type: string description: >- The address the recipient sees: an E.164 number (`sms`, `voice`, `whatsapp`), an email address (lowercase), `@botname` (`telegram`), `@username` (`instagram`), the Facebook Page id (`messenger`), or the literal `sms_oneway` (one-way SMS goes out from shared system numbers, and messages on it store this same literal as `from`). example: '+13125551212' type: $ref: '#/components/schemas/ChannelType' active: type: boolean description: >- It can send right now. A connected transport that is switched off is listed with `active: false`; turn it on with `POST /v2/channels/{address}/{type}/activate`. `sms`, `sms_oneway` and `voice` have no switch and are always active. v1SenderId: type: string description: >- Read-only. The /v1 sender behind this entry, usable as the `Zavu-Sender` header on /v1. Entries with the same `v1SenderId` are one channel group. On /v2 it is accepted as `from` only when two entries of different groups share an address (see `409 ambiguous_from`). Error: type: object required: - code - message description: >- Every v2 error has this shape at the root. There is no `{error: {...}}` wrapper anywhere in v2. A missing resource is `404 not_found` with the message ` not found`; an address the project does not have is `404 not_found`, `None of this project's channels has the address
.`, with the address in `details` under the name the request used (`from` or `address`). A `message` is written for the caller and never carries a stack trace or a source path. A body that is not JSON is `400 invalid_json`, with `details.errors` (`path: []`, the parse error in `message`). properties: code: type: string example: invalid_request message: type: string details: type: object additionalProperties: true description: >- Machine-readable context. Keys that mean the same thing everywhere: - `errors`: present on every `400 invalid_request` for an invalid body or query parameter, `[{path, message, ...}]`, `path` naming the field (`["to"]`, `["contacts", 2, "recipient"]`, `["limit"]`). - `recommendation`: one sentence saying what to do next. - `dashboardUrl`: the dashboard screen that fixes it. - `connect`: on `409 no_channel`, the channels this project can connect to reach the recipient, each `{type, request, note, available, dashboardUrl?}`; `request` is the exact call (`POST /v2/channels` with its body, or `POST /v2/numbers`), or null for a channel connected from the dashboard (WhatsApp, Instagram, Messenger). `available: false` says why in `note` (one-way SMS closed until business verification is approved). - `address` / `from`: the address the error is about, under the name the request used for it. properties: errors: type: array items: type: object required: - path - message properties: path: type: array items: oneOf: - type: string - type: integer message: type: string code: type: string additionalProperties: true ChannelType: type: string description: A transport a message travels on. enum: - sms - sms_oneway - whatsapp - telegram - email - instagram - messenger - voice securitySchemes: bearerAuth: type: http scheme: bearer ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.