> ## Documentation Index > Fetch the complete documentation index at: https://docs.inboxapp.com/llms.txt > Use this file to discover all available pages before exploring further. # Quick send message > Send a message without knowing the thread ID ahead of time. Automatically creates a thread if needed. Sending to a prospect who hasn't messaged you first (outbound) requires the **Outbound Messages addon** (\$199/mo). Replying to existing conversations works on all plans. See [Working with messages](/guides/messages) for details. ## OpenAPI ````yaml POST /threads/messages openapi: 3.1.1 info: title: Inbox API version: 1.0.0 description: >+ The Inbox API gives you full access to manage the following entities in your team: - **Threads**: DM conversations on X - **Account links**: X accounts connected to your team - **Members**: users who can access the team - **Prospects**: external profiles on X - **Tags**: labels for prospects - **Statuses**: pipeline statuses for prospects - **Lists**: collections of leads with custom columns and import jobs - **Campaigns**: automated multi-step DM sequences ## A quick note on IDs Inbox stores two types of IDs for objects that relate to X: - `id` — The Inbox ID, which is the ID of the Inbox object - `platformId` — The original X 'platform' ID, which is the ID of the X user, conversation, etc. Throughout the API, you'll see instances where multiple IDs are present. `platformId` is always the original X ID. ## Helpful X URLs You can use platform IDs to construct direct links to X: - **User profile**: `https://x.com/i/user/{platformId}` — This is the most reliable way to link to a user since it uses their immutable ID rather than their username, which can change. - **User by username**: `https://x.com/{username}` — Note that usernames can change, so this link may break if the user updates their handle. - **Tweet/Post**: `https://x.com/anyusername/status/{tweetId}` — The username in the URL is ignored by X; only the tweet ID matters. You can use any string in place of the username and the link will still work. - **DM conversation**: `https://x.com/i/chat/{conversationPlatformId}` — The conversation ID is formatted as `{smallerUserId}:{largerUserId}`, where the two participant user IDs are sorted numerically (smaller ID first). ## Encoding objects and arrays in query params Inbox's API uses bracket notation to denote objects and arrays. ### Objects For an endpoint that accepts a `cursor` parameter for instance, with the cursor object being ```json { id: "l44e15irdq4db30i77cgphhx", timestamp: "2025-11-10T18:03:16.000Z" } ``` The URL search params would be encoded as: ```txt ?cursor[id]=l44e15irdq4db30i77cgphhx&cursor[timestamp]=2025-11-10T18:03:16.000Z ``` ### Arrays For an endpoint that accepts an `ids` parameter for instance, with the value being ```json ["1", "2", "3"] ``` there are three options: 1. Repeat the parameter for each value: ```txt ?ids=1&ids=2&ids=3 ``` 2. Append `[]` to explicitly denote an array (useful if there's only one value): ```txt ?ids[]=1&ids[]=2&ids[]=3 ``` 3. Append `[number]` to denote the array index. This option is the most flexible and allows for reordering and skipping values: ```txt ?ids[0]=1&ids[1]=2&ids[2]=3 ``` summary: >- The Inbox API gives you full access to manage the following entities in your team. servers: - url: https://inboxapp.com/api/v1 security: [] tags: - name: Teams description: >- Teams are shared workspace for members to view and manage account links, tags, statuses, campaigns, conversations, and more. - name: Threads description: >- Threads represent conversations between an account linked to your team and a prospect on Twitter. - name: Messages description: |- Messages are the individual messages sent in a thread. - name: Account Links description: |- Account links represent X accounts connected to your team. - name: Members description: |- Members are Inbox users who can access the team. - name: Prospects description: |- Prospects represent external profiles on X. - name: Tags description: |- Tags are labels for prospects. - name: Statuses description: >- Statuses are used to track the deal stage or any fixed state for a prospect. - name: Colors description: >- Get predefined color options that can be used when creating or updating tags and statuses. - name: Lists description: >- Lists are collections of leads that you can organize, filter, and use as targeting sources for campaigns. - name: List columns description: >- Custom columns defined on a list. Each column stores a text value per lead and can be used as merge variables in campaign messages. - name: Leads description: >- Leads are prospects that belong to a list. Each lead has the full prospect profile, CRM context (tags, status, notes), and list-specific custom column data. - name: Import jobs description: >- Import jobs populate lists from various sources including CSV files, X followers, tweet engagements, and X lists. Poll the job status endpoint to track progress. - name: Campaigns description: >- Campaigns are automated multi-step DM sequences sent to leads via your linked X accounts. A campaign pulls its leads from your existing lists using **lead rules** — attach lists to automatically sync leads into the campaign, and optionally exclude lists (e.g. a "Do Not Contact" list) to avoid messaging certain people. Leads can also be added directly or imported in bulk. Each campaign has a **sequence** of steps — messages, delays, and tweet interactions — that run for every lead. Messages support variables for personalization: use the built-in `first-name` variable or create **custom columns** on the campaign to store per-lead data like company name or role. **Automations** let you trigger actions when certain events occur, such as applying a tag or setting a status when a prospect replies. Configure a sending schedule and hourly message rate, then enable the campaign to start sending. paths: /threads/messages: post: tags: - Messages summary: Quick send message description: >- Send a message without knowing the thread ID ahead of time. Automatically creates a thread if needed. operationId: threads.messages.quickSend requestBody: required: true content: application/json: schema: type: object properties: externalPlatformId: type: string description: >- The platform ID of the prospect. Must be provided if `externalId` is not provided. examples: - '1234567890' externalId: type: string description: >- The Inbox external ID of the prospect. Must be provided if `externalPlatformId` is not provided. examples: - '1234567890' accountLinkId: type: string pattern: ^[0-9a-z]+$ description: The account link ID to send the message from. examples: - df6jbw4h36... content: type: string minLength: 1 examples: - Hey, I'm reaching out from Acme Agency... required: - accountLinkId - content responses: '200': description: OK content: application/json: schema: type: object properties: message: $ref: '#/components/schemas/Message' thread: type: object properties: id: type: string pattern: ^[0-9a-z]+$ platformId: anyOf: - type: string - type: 'null' required: - id - platformId required: - message - thread components: schemas: Message: type: object properties: platform: enum: - twitter description: The platform the message was sent from. examples: - twitter teamId: type: string pattern: ^[0-9a-z]+$ examples: - df6jbw4h36... threadId: type: string pattern: ^[0-9a-z]+$ examples: - df6jbw4h36... id: type: string pattern: ^[0-9a-z]+$ description: The Inbox ID of the message. examples: - df6jbw4h36... userId: anyOf: - type: string pattern: ^[0-9a-z]+$ - type: 'null' description: The Inbox user who sent this message if applicable. examples: - df6jbw4h36... createdAt: type: string format: date-time x-native-type: date updatedAt: anyOf: - type: string format: date-time x-native-type: date - type: 'null' platformId: anyOf: - type: string - type: 'null' examples: - '1234567890' content: type: string examples: - Hey, I'm reaching out from Acme Agency... campaignId: anyOf: - type: string pattern: ^[0-9a-z]+$ - type: 'null' description: The Inbox campaign ID that sent this message if applicable. examples: - df6jbw4h36... authorId: type: string description: >- Will either be the `accountLinkId` or the `externalId` of the thread. May be a cuid2 or a legacy external ID. examples: - df6jbw4h36... origin: anyOf: - enum: - internal - external - api - type: 'null' description: >- The origin of the message. 'internal' means send from a user on Inbox, 'external' means synced from Twitter, 'api' means sent via the API. examples: - internal replyData: anyOf: - not: {} - type: 'null' description: The reply data of the message if applicable. forwardData: anyOf: - not: {} - type: 'null' description: The forward data of the message if applicable. entities: not: {} description: Normalized URL entities, mentions, hashtags, tweet shares. attachment: not: {} description: Normalized media and card attachments. reactions: type: array items: not: {} description: Normalized reactions. isEncrypted: anyOf: - type: boolean - type: 'null' description: Whether the message is end-to-end encrypted. isEdited: type: boolean description: Whether the message has been edited. failed: anyOf: - type: boolean - type: 'null' description: >- Whether the message failed to send / was never received by the platform. deletedAt: anyOf: - type: string format: date-time x-native-type: date - type: 'null' description: When the message was soft-deleted in Inbox. platformDeletedAt: anyOf: - type: string format: date-time x-native-type: date - type: 'null' description: When the message was deleted on the platform. required: - platform - teamId - threadId - id - userId - createdAt - updatedAt - platformId - content - campaignId - authorId - origin - replyData - forwardData - entities - attachment - reactions - isEncrypted - isEdited - failed - deletedAt - platformDeletedAt ````