How do I format phone numbers for sending SMS?

Phone numbers must include the country code without the 00 prefix. For example: China uses 86 (e.g., 8615800000000), Brazil uses 55 (e.g., 5511999999999), US uses 1 (e.g., 12025551234). The number should be 5-20 digits total. For Chinese domestic SMS, the message must start with a registered signature like [YourBrand].

What's the difference between send_sms and send_international_sms tools?

The `send_sms` tool uses the standard SMS gateway (smssh.253.com) optimized for Chinese domestic messages and requires pre-registered templates and signatures. The `send_international_sms` tool uses the international gateway (intapi.253.com) for global delivery outside China, which supports SenderId and doesn't require Chinese-style signatures. International SMS permissions must be separately enabled in your account.

How does the MD5 signature authentication work?

The Chuanglan API uses MD5 signature authentication for security. Your password is NEVER sent in the request body. Instead, it's combined with the request parameters and timestamp (nonce), then hashed with MD5 to generate a `sign` header. The server validates this signature to ensure request integrity. The framework handles all signature generation automatically — you only need to provide your account and password.

Chuanglan 253 MCP Connector for Claude

A+

Ultra-high volume SMS & 1-click login API — send verification codes, notifications, and bulk messages globally via Chuanglan 253.

10 tools Official Updated Jun 28, 2026 Official Vinkius Partner

More Details Connect to Claude

Connect your Chuanglan 253 SMS gateway to any AI agent and transform your communication workflows through natural conversation. Chuanglan (创蓝) is one of China's largest CPaaS providers, handling billions of SMS messages monthly for verification, notifications, and marketing.

What you can do

Send SMS Messages — Deliver text messages to any phone number worldwide with country code support
Verification Codes — Send one-time passwords (OTP) for 1-click login flows and two-factor authentication
Voice Verification — Fallback to automated voice calls when SMS delivery is unreliable
Balance Monitoring — Check your SMS credit balance and quota in real-time before campaigns
Delivery Tracking — Query the status of individual messages or entire batches with message IDs
Template Management — List, create, and manage pre-approved SMS templates for compliance
Account Management — View account settings, permissions, and enabled features

How it works

Subscribe to this server
Enter your Chuanglan 253 API Account and Password
Start sending SMS and verification codes from Claude, Cursor, or any MCP-compatible client

Your AI agent becomes your SMS operations center, handling verification flows, delivery monitoring, and campaign tracking without touching a dashboard.

Who is this for?

Developers — Integrate SMS verification and 1-click login directly into AI-assisted workflows
Product Teams — Monitor SMS delivery rates and template compliance through natural language queries
Operations — Track bulk SMS campaign status and account balance without API calls
Security Teams — Send verification codes and voice calls for multi-factor authentication flows

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10 tools expose this connector's capabilities to your AI agent.

create_template

The template must be approved before it can be used. Template content should include variable placeholders like {1}, {2} for dynamic content. Approval typically takes a few minutes to hours. Create a new SMS template in Chuanglan 253

get_account_info

). Get Chuanglan 253 account information and settings

get_sms_balance

Use this to monitor available messaging capacity before sending campaigns. Check SMS account balance on Chuanglan 253

query_batch_sms_status

This is useful for checking the status of bulk SMS campaigns where multiple messages were sent with the same tracking identifier. Query delivery status for a batch of SMS messages

query_sms_status

Returns whether the message was delivered, is pending, or failed, along with timestamps. Query delivery status of a specific SMS message

query_template_list

Templates are pre-approved message formats that can be used for sending. Each template has an ID, name, content, and approval status. List all SMS templates in your Chuanglan account

send_international_sms

The phone number must include the country code without 00 prefix (e.g., 5511999999999 for Brazil). This endpoint uses the international gateway and requires proper permissions. Send an international SMS message via Chuanglan 253

send_sms

The phone number must include the country code (e.g., 86 for China, 55 for Brazil). For Chinese domestic SMS, the message content must start with a signature in brackets like [YourBrand]. Returns submission status and message ID. Send an SMS message via Chuanglan 253 platform

send_verification_sms

This is commonly used for 1-click login flows, phone number verification, and two-factor authentication. The message format should follow the template registered in your account. Phone number must include country code. Send a verification code SMS (1-click login style)

send_voice_verification

This is an alternative to SMS verification, useful when SMS delivery fails or for enhanced security. The code will be spoken in the call. Send a voice verification call with a code