Crescendo Lab MAAC Go API

openapi: 3.2.0
info:
  title: MAAC Go API
  version: 1.0.0
  description: "MAAC Go — Taiwan-first self-serve SMS platform. Send transactional (OTP /\norder / reminder) and broadcast SMS with NCC compliance, MAAC delivery\nbackend, and real-time DLR webhooks.\n\n- Base URL: `https://sms.cresclab.com/api`\n- Auth: `Authorization: Bearer <sk_live_... or sk_test_...>`\n- New accounts receive a one-time NT$39 trial credit (50 SMS) on signup, enough to send real test SMS immediately.\n- API keys are scoped and wallet-backed; sending debits the account balance unless your deployment uses a mock SMS/payment adapter.\n- All phone numbers use E.164 (`+886912345678`). 09xxxxxxxx is also accepted.\n- Cost: NT$0.78 per SMS segment (Chinese: 70 chars/segment · English: 160/segment).\n- Rate-limit errors return `429 rate_limited` with limit/used details and retry guidance when available.\n- Delivery confirmations arrive asynchronously via webhook (`sms.delivered`\n  / `sms.failed`); poll `GET /sms/{id}` as a fallback.\n- MCP clients (Claude / Cursor / Windsurf) can use this spec directly, or\n  connect via `POST /api/mcp` (JSON-RPC 2.0) with the same bearer key.\n"
  contact:
    name: MAAC Go Support
    email: info@cresclab.com
    url: https://sms.cresclab.com
  license:
    name: Commercial
    url: https://sms.cresclab.com/terms.html
servers:
- url: https://sms.cresclab.com/api
  description: Production
security:
- bearerAuth: []
tags:
- name: MAAC Go API
paths: {}
webhooks:
  sms.delivered:
    post:
      summary: SMS reached the recipient's handset
      description: 'Delivered to your webhook endpoint when MAAC''s DLR confirms delivery.

        Sign with HMAC-SHA256: `X-Cresclab-Signature: <hex_digest>` where

        `hex_digest = HMAC_SHA256(your_webhook_secret, raw_request_body)`.

        '
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/WebhookEvent'
      responses:
        '200':
          description: ACK with any 2xx
      tags:
      - MAAC Go API
  sms.failed:
    post:
      summary: Final delivery failure (number invalid / blocked / undeliverable)
      description: Wallet is auto-refunded for failed messages.
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/WebhookEvent'
      responses:
        '200':
          description: ACK with any 2xx
      tags:
      - MAAC Go API
  sms.sent:
    post:
      summary: Message accepted by carrier (interim state)
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/WebhookEvent'
      responses:
        '200':
          description: ACK
      tags:
      - MAAC Go API
components:
  schemas:
    WebhookEvent:
      type: object
      description: 'Outbound event sent to your configured webhook URL. Verify `X-Cresclab-Signature`

        header: `hmac_sha256(your_webhook_secret, raw_body_bytes).hex() == header_value`.

        '
      properties:
        event:
          type: string
          enum:
          - sms.sent
          - sms.delivered
          - sms.failed
        data:
          type: object
          properties:
            id:
              type: string
              example: sms_abc123
            to:
              type: string
            status:
              type: string
            error:
              type:
              - string
              - 'null'
        created_at:
          type: string
          format: date-time
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: '`Authorization: Bearer <api_key>`. Production keys start with `sk_live_`,

        test keys with `sk_test_` for environment separation. Sending still follows

        the account wallet and deployment adapter settings.

        '