title: Services, APIs & Vendors

aliases: [Vendor Inventory, API Inventory]

tags: [3netra/wiki, vendors, apis, services]

product: 3netra Meta Android App

source_repository: 3Netra-ai/3n_meta_android

source_ref: origin/prod

source_revision: b48aada8fd5427b5db0c02945569963c4ae543c8

last_verified: 2026-08-06

| Vendor | Purpose | Endpoint / Transport | Auth / Key source | Status |

|---|---|---|---|---|

| **Meta (Wearables DAT SDK)** | Registration, device state, camera capture API | DAT SDK / Bluetooth | Manifest meta-data resolves from Gradle resources; fallback values are committed in `app/build.gradle` (rotate/remove) | 🟡 code path; no hardware verification or gesture callback registration |

| **Supabase** | Auth (GoTrue), Postgres (PostgREST), Realtime | `BuildConfig.SUPABASE_URL` | `SUPABASE_ANON_KEY` | ✅ primary |

| **OpenAI** | Edge Function implementation requests `gpt-4o` | Supabase `chat-vision` Edge Function | Edge-function environment variable | 🟡 app invokes it, but client discards its reply |

| **AWS** | Unreferenced SAM prototype: Lambda/API Gateway/S3/Rekognition | `AwsBackendService` / `/api/*` | Build config + SAM parameters | 🟡 source exists; no production app call site |

| **Sarvam.ai** | Indic translation, TTS (speaker "meera"), STT (model "saaras:v1") | `https://api.sarvam.ai/translate`, `/text-to-speech`, `/speech-to-text` | `SARVAM_API_KEY` (Bearer + `api-subscription-key`) | ✅ voice |

| **Google Identity** | Sign-In (Credential Manager bottom sheet → ID token → Supabase IDToken auth) | play-services-auth / credentials API | `GOOGLE_WEB_CLIENT_ID` | ✅ auth |

| **TensorFlow Lite (LiteRT)** | FaceNet embedding calculation | In-process; asset `facenet.tflite` | n/a | 🟡 embedding store/read path is Supabase, not local-only |

| **Ollama (LAN)** | Legacy/local VLM client | Hardcoded private-LAN endpoint in `VisionService` | none | ❌ no active production call site |

| **Resend** | Welcome/notification emails | Firebase Functions + Vercel function | `RESEND_API_KEY` / functions config | 🟡 legacy |

| **Firebase** | Cloud Functions (email triggers) only — auth/data removed | n/a | n/a | 🟡 legacy |

| **Vercel** | `api/send-welcome.js` serverless (project `3netra`) | vercel.app | env | 🟡 legacy |

| **Android platform** | TextToSpeech, SpeechRecognizer (voice commands, dictation), CameraX (face registration), BLE APIs, EncryptedSharedPreferences | on-device | n/a | ✅ |

| **Google ML Kit face-detection** | Declared in build.gradle | — | — | ❌ unused |

| Key | Used by |

|---|---|

| `SUPABASE_URL`, `SUPABASE_ANON_KEY` | SupabaseService |

| `AWS_BACKEND_URL` | AwsBackendService only; no production caller at this ref |

| `SARVAM_API_KEY` | SarvamService |

| `GOOGLE_WEB_CLIENT_ID` | GoogleAuthHelper |

| `OPENAI_API_KEY` | Defined but unreferenced in Android code (remove from client build inputs) |

| `GITHUB_ACTOR`, `GITHUB_TOKEN` (env) | Meta SDK Maven resolution |

All sourced from `src/frontend/local.properties` with env fallback. No `local.properties.example` exists.

| Service | Responsibility | External deps |

|---|---|---|

| `BluetoothService` | Callable mode handlers, capture/AI invocation, chat history, DAT state observation | Meta SDK, Sarvam, Supabase AI, Supabase |

| `WearableCameraService` | MWDAT camera session → photo bytes (mutex-guarded) | Meta SDK |

| `SupabaseAiService` | Active `chat-vision` caller; incorrectly returns fixed success text instead of decoding the response | Supabase Functions |

| `AwsBackendService` | `/api/chat` client with retry logic; unreferenced by production app code | AWS Lambda |

| `SupabaseService` | Auth (email/OTP/Google), profiles, settings, sessions, face embeddings, Realtime | Supabase |

| `SupabaseDashboardRepository` | Settings/audit repository methods; no active dashboard/role flow verified | Supabase |

| `SarvamService` | translateText / textToSpeech / speechToText | Sarvam.ai |

| `VisionService` | Legacy VLM router (Ollama moondream/llava; GPT4_VISION enum) | Ollama LAN |

| `FaceNetModel` | TFLite embeddings + cosine similarity | LiteRT |

| `VoiceCommandService` | Foreground mic service, BT SCO, broadcasts `VOICE_COMMAND` | Android SpeechRecognizer |

| `AudioTranscriptionService` | Continuous lecture dictation | Android SpeechRecognizer |

| `EmotionDetectionService` / `HallwayNavigationService` / `RecessSocialService` | Mode-specific prompt wrappers (concise, word-limited) | SupabaseAiService; no active student route for hallway/recess |

| `EmergencyAlertManager` | SOS → Supabase `emergency_alerts` | Supabase |

| `ChildVoicePersonaManager` | Scene-screen Android TTS with legacy K–6 vocabulary filtering | Android TTS |

| `PinManager` | Teacher PIN (BCrypt in secure prefs) | jbcrypt |

| `SmartCaptureController` | Adaptive capture intervals (battery saver) | — |

| `MetaWearableService` | Placeholder stub (no real SDK calls) | — |

| Utils: `EncryptedFaceStorageManager`, `MediaCompressor`, `PdfExportManager` | Unused encrypted-face utility · pre-upload compression · legacy external-storage PDF writer | androidx.security / Android |

| Endpoint | Method | Payload | Returns |

|---|---|---|---|

| Supabase Function `chat-vision` | invoke | `{prompt, mediaType, frames[]}` | Function returns `{message}`, but Android client presently discards it |

| `{AWS_BACKEND_URL}/api/chat` | POST | `{prompt, mediaType: NONE/IMAGE/VIDEO, frames[]}` | `{message}`; implemented but not used by production callers |

| `{AWS_BACKEND_URL}/api/vision` | POST | `{image_base64}` | `{labels[]}` (Rekognition) |

| `{AWS_BACKEND_URL}/api/upload` | POST | `{image_base64}` | S3 file ref |

| `{AWS_BACKEND_URL}/api/auth` | POST | `{access_token}` | `{user}` (Supabase verify) |

| `api.sarvam.ai/translate` | POST | `{input, source_language_code, target_language_code}` | translated text |

| `api.sarvam.ai/text-to-speech` | POST | `{text, speaker: meera, …}` | base64 `audios[]` |

| `api.sarvam.ai/speech-to-text` | POST multipart | audio, `model: saaras:v1` | transcript |

| Supabase PostgREST | — | client references `user_profiles`, `students`, `student_settings`, `sessions`, `face_embeddings`, `audit_logs`, and `emergency_alerts`; server schema/policies are not committed | — |

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