> ## Documentation Index > Fetch the complete documentation index at: https://bavlio.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Email deliverability check, SMTP-backed (x402-paid, $0.003 USDC) > SMTP-backed inline validate. No ARQ. No user context. Idempotent. Prefilter hard-rejects (bad syntax / reserved / placeholder / system) settle a stable ``risk_level == "invalid"`` payload rather than raising — the agent asked a question and got a definitive answer. Otherwise the SMTP verdict is mapped into the unchanged DTO; a non-answer (SMTP unavailable) returns 503 so x402 skips settlement. ## OpenAPI ````yaml https://api.bavlio.com/openapi.json post /api/x402/v1/email/validate openapi: 3.1.0 info: title: Bavlio API description: >- Outreach automation API — lead enrichment, email campaigns, LinkedIn automation, and AI agent. Full docs at https://docs.bavlio.com. version: 1.0.0 x-guidance: product: Bavlio Data API protocols: - x402 description: >- Pay-per-call B2B data endpoints for AI agents. USDC on Base mainnet via x402 v2. See /openapi.json for pricing. Landing page + marketing details: https://bavlio.com/developers network: eip155:8453 docs_url: https://docs.bavlio.com x-payment-merchant-address: '0xcca4725e0e931982830bff523b141e1a7a58d3e7' servers: [] security: [] tags: - name: API Keys description: >- Create, list, and revoke API keys for programmatic access. JWT authentication required. - name: credits description: Credit balance, cost estimates, and transaction history. - name: campaigns description: Create, manage, launch, and monitor email campaigns. - name: campaign-personalization description: AI-powered email subject and body personalization for campaigns. - name: email-finder description: Find and verify email addresses for prospects. - name: sender-profiles description: Manage sender identity profiles for outreach. - name: sender-profile-chat description: Interactive chat for building sender profiles. - name: templates description: Email template CRUD. - name: suppression description: Do-not-contact suppression list management. - name: datasets description: Lead dataset listing, download, and updates. - name: user-extractions description: Uploaded lead file management and processing. - name: enrichment-chat description: Interactive chat for data enrichment sessions. - name: enrichment-processing description: Batch lead enrichment processing. - name: File Upload (CSV/Excel) description: Upload and preview CSV/Excel lead files. - name: connected-accounts description: LinkedIn account connections via Unipile. - name: linkedin-content description: LinkedIn post creation, scheduling, and management. - name: linkedin-playground description: Direct LinkedIn actions (profile lookup, messaging, engagement). - name: bavimail-proxy description: BaviMail domain, alias, and email management. - name: agent description: Bavi AI agent chat with SSE streaming. - name: notifications description: Notification preferences and delivery. - name: referral description: Referral code management and stats. - name: feedback description: User feedback submission. - name: authentication description: JWT token verification and user info. - name: users description: User quota and usage information. - name: Health description: Health checks and system status. - name: Personalization description: Core lead personalization engine. - name: Session Management description: Enrichment session lifecycle. - name: Session Processing description: Session data processing. - name: webhooks description: Inbound webhook handlers (Stripe, BaviMail, Unipile). paths: /api/x402/v1/email/validate: post: tags: - x402 summary: Email deliverability check, SMTP-backed (x402-paid, $0.003 USDC) description: >- SMTP-backed inline validate. No ARQ. No user context. Idempotent. Prefilter hard-rejects (bad syntax / reserved / placeholder / system) settle a stable ``risk_level == "invalid"`` payload rather than raising — the agent asked a question and got a definitive answer. Otherwise the SMTP verdict is mapped into the unchanged DTO; a non-answer (SMTP unavailable) returns 503 so x402 skips settlement. operationId: email_validate_api_x402_v1_email_validate_post requestBody: content: application/json: schema: $ref: '#/components/schemas/EmailValidateRequest' required: true responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/EmailValidateResponse' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' components: schemas: EmailValidateRequest: properties: email: type: string format: email title: Email description: Email address to validate type: object required: - email title: EmailValidateRequest EmailValidateResponse: properties: email: type: string title: Email normalized: anyOf: - type: string - type: 'null' title: Normalized valid_format: type: boolean title: Valid Format has_mx: type: boolean title: Has Mx is_disposable: type: boolean title: Is Disposable is_role: type: boolean title: Is Role risk_level: type: string title: Risk Level reason: anyOf: - type: string - type: 'null' title: Reason backend: type: string title: Backend type: object required: - email - valid_format - has_mx - is_disposable - is_role - risk_level - backend title: EmailValidateResponse HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type type: object required: - loc - msg - type title: ValidationError ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.