Before you start<\/h2>\n\n- A free Fast2SMS account<\/a>. Your API key is in the Dev API section.<\/li>\n
- For business SMS in India: DLT registration (entity, sender ID, templates). It is a TRAI rule, and Fast2SMS gives free DLT support<\/a> to complete it. New to DLT? Start with the beginners guide<\/a>.<\/li>\n
- Recipients are Indian 10-digit mobile numbers.<\/li>\n<\/ul>\n
\n ![\"Dev](\"https:\/\/www.fast2sms.com\/help\/wp-content\/uploads\/2026\/05\/Screenshot-2026-05-02-at-11.46.20-PM.png\")
The Dev API section: your key, routes and ready examples.<\/figcaption><\/figure>\nRoute 1: DLT SMS (production messages)<\/h2>\n
Send your approved DLT template to one or many numbers:<\/p>\n
curl -X POST \"https:\/\/www.fast2sms.com\/dev\/bulkV2\" \\\n -H \"Authorization: YOUR_API_KEY\" \\\n -H \"Content-Type: application\/json\" \\\n -d '{\n \"route\": \"dlt\",\n \"sender_id\": \"FSTSMS\",\n \"message\": \"111111\",\n \"variables_values\": \"Rahul|8888888888|6695\",\n \"numbers\": \"8888888888,9999999999\"\n }'<\/code><\/pre>\n\nsender_id<\/code> \u2014 your approved 6-letter DLT header.<\/li>\nmessage<\/code> \u2014 your approved template’s message ID.<\/li>\nvariables_values<\/code> \u2014 values for each {#var#}<\/code>, separated by a pipe.<\/li>\nnumbers<\/code> \u2014 comma-separated list. Hundreds per call is fine for bulk sends.<\/li>\nschedule_time<\/code> \u2014 optional, send later with DD-MM-YYYY-HH-MM.<\/li>\n<\/ul>\nSuccess response:<\/p>\n
{\n \"return\": true,\n \"request_id\": \"lwdtp7cjyqxvfe9\",\n \"message\": [\"Message sent successfully\"]\n}<\/code><\/pre>\nRoute 2: Quick SMS (no DLT needed)<\/h2>\n
Quick SMS sends without your own DLT templates, useful for testing and internal alerts. Same endpoint with route=q<\/code> and free-text message<\/code>. Details and pricing in send SMS without DLT registration<\/a>.<\/p>\n\n ![\"Quick](\"https:\/\/www.fast2sms.com\/help\/wp-content\/uploads\/2026\/06\/Screenshot-2026-06-28-at-1.43.32-PM.png\")
Quick SMS works with a simple GET request too.<\/figcaption><\/figure>\nRoute 3: OTP API<\/h2>\n
Three endpoints handle the whole OTP flow: send OTP, verify OTP, resend OTP (allowed within a 10-minute window). Fast2SMS generates and checks the code, so you never store OTPs yourself. Pair it with Smart OTP to add WhatsApp delivery with SMS fallback<\/a>.<\/p>\nSend an OTP (the otp_id<\/code> comes from your Smart OTP panel):<\/p>\ncurl --request POST \\\n --url https:\/\/www.fast2sms.com\/dev\/otp\/send \\\n --header 'Authorization: YOUR_API_KEY' \\\n --header 'content-type: application\/json' \\\n --data '{ \"otp_id\": \"11111111\", \"mobile\": \"8888888888\" }'\n\n{ \"return\": true, \"status_code\": 200, \"request_id\": \"lwdtp7cjyqxvfe9\", \"message\": \"OTP sent successfully\" }<\/code><\/pre>\nVerify what the user typed:<\/p>\n
curl --request POST \\\n --url https:\/\/www.fast2sms.com\/dev\/otp\/verify \\\n --header 'Authorization: YOUR_API_KEY' \\\n --header 'content-type: application\/json' \\\n --data '{ \"mobile\": \"8888888888\", \"otp\": \"123456\" }'\n\n{ \"return\": true, \"status_code\": 200, \"message\": \"OTP verified successfully\" }<\/code><\/pre>\nA wrong code returns 400 Invalid OTP<\/code>, and an already-used code returns 404 OTP not found or already verified<\/code>. Full PHP examples for both calls are in the Smart OTP guide<\/a>.<\/p>\nDelivery reports and webhooks<\/h2>\n
Create an SMS webhook and Fast2SMS calls your URL with status updates for every message. Prefer polling? The delivery report API fetches statuses by request_id, and the logs API pulls history. A wallet balance endpoint lets your system alert you before credit runs low. All at docs.fast2sms.com<\/a>.<\/p>\n\n ![\"DLT](\"https:\/\/www.fast2sms.com\/help\/wp-content\/uploads\/2026\/05\/Screenshot-2026-05-02-at-11.53.14-PM.png\")
Test a DLT send straight from the panel, then copy the same call into your code.<\/figcaption><\/figure>\nFrequently asked questions<\/h2>\nWhat does the SMS API cost?<\/h3>\n
No platform fee. You pay per SMS from your wallet at DLT bulk rates, among the lowest in India. See DLT bulk SMS pricing<\/a>.<\/p>\nDo I need DLT registration?<\/h3>\n
For business SMS to Indian numbers, yes. It is one-time, and Fast2SMS DLT support does the heavy lifting free. The Quick SMS route works without it for permitted use cases.<\/p>\n
How many SMS can one API call send?<\/h3>\n
Pass a comma-separated list in numbers<\/code> and send to hundreds per call. For campaigns, batch your list and loop.<\/p>\nCan I schedule messages?<\/h3>\n
Yes. Add schedule_time<\/code> in DD-MM-YYYY-HH-MM format and the message goes out then.<\/p>\nHow do I get delivery status into my database?<\/h3>\n
Create an SMS webhook. Fast2SMS posts status updates to your URL as they happen. You can also fetch reports by request_id.<\/p>\n
Is there a WhatsApp API too?<\/h3>\n
Yes, same account and key. See the WhatsApp message API guide<\/a>.<\/p>\nGet your API key<\/h2>\n
Create your free account, grab the key from Dev API, and your first SMS can go out in the next five minutes.<\/p>\n
Route 1: DLT SMS (production messages)<\/h2>\n
Send your approved DLT template to one or many numbers:<\/p>\n
curl -X POST \"https:\/\/www.fast2sms.com\/dev\/bulkV2\" \\\n -H \"Authorization: YOUR_API_KEY\" \\\n -H \"Content-Type: application\/json\" \\\n -d '{\n \"route\": \"dlt\",\n \"sender_id\": \"FSTSMS\",\n \"message\": \"111111\",\n \"variables_values\": \"Rahul|8888888888|6695\",\n \"numbers\": \"8888888888,9999999999\"\n }'<\/code><\/pre>\n\nsender_id<\/code> \u2014 your approved 6-letter DLT header.<\/li>\nmessage<\/code> \u2014 your approved template’s message ID.<\/li>\nvariables_values<\/code> \u2014 values for each {#var#}<\/code>, separated by a pipe.<\/li>\nnumbers<\/code> \u2014 comma-separated list. Hundreds per call is fine for bulk sends.<\/li>\nschedule_time<\/code> \u2014 optional, send later with DD-MM-YYYY-HH-MM.<\/li>\n<\/ul>\nSuccess response:<\/p>\n
{\n \"return\": true,\n \"request_id\": \"lwdtp7cjyqxvfe9\",\n \"message\": [\"Message sent successfully\"]\n}<\/code><\/pre>\nRoute 2: Quick SMS (no DLT needed)<\/h2>\n
Quick SMS sends without your own DLT templates, useful for testing and internal alerts. Same endpoint with route=q<\/code> and free-text message<\/code>. Details and pricing in send SMS without DLT registration<\/a>.<\/p>\n\n Quick SMS works with a simple GET request too.<\/figcaption><\/figure>\nRoute 3: OTP API<\/h2>\n
Three endpoints handle the whole OTP flow: send OTP, verify OTP, resend OTP (allowed within a 10-minute window). Fast2SMS generates and checks the code, so you never store OTPs yourself. Pair it with Smart OTP to add WhatsApp delivery with SMS fallback<\/a>.<\/p>\nSend an OTP (the otp_id<\/code> comes from your Smart OTP panel):<\/p>\ncurl --request POST \\\n --url https:\/\/www.fast2sms.com\/dev\/otp\/send \\\n --header 'Authorization: YOUR_API_KEY' \\\n --header 'content-type: application\/json' \\\n --data '{ \"otp_id\": \"11111111\", \"mobile\": \"8888888888\" }'\n\n{ \"return\": true, \"status_code\": 200, \"request_id\": \"lwdtp7cjyqxvfe9\", \"message\": \"OTP sent successfully\" }<\/code><\/pre>\nVerify what the user typed:<\/p>\n
curl --request POST \\\n --url https:\/\/www.fast2sms.com\/dev\/otp\/verify \\\n --header 'Authorization: YOUR_API_KEY' \\\n --header 'content-type: application\/json' \\\n --data '{ \"mobile\": \"8888888888\", \"otp\": \"123456\" }'\n\n{ \"return\": true, \"status_code\": 200, \"message\": \"OTP verified successfully\" }<\/code><\/pre>\nA wrong code returns 400 Invalid OTP<\/code>, and an already-used code returns 404 OTP not found or already verified<\/code>. Full PHP examples for both calls are in the Smart OTP guide<\/a>.<\/p>\nDelivery reports and webhooks<\/h2>\n
Create an SMS webhook and Fast2SMS calls your URL with status updates for every message. Prefer polling? The delivery report API fetches statuses by request_id, and the logs API pulls history. A wallet balance endpoint lets your system alert you before credit runs low. All at docs.fast2sms.com<\/a>.<\/p>\n\n Test a DLT send straight from the panel, then copy the same call into your code.<\/figcaption><\/figure>\nFrequently asked questions<\/h2>\nWhat does the SMS API cost?<\/h3>\n
No platform fee. You pay per SMS from your wallet at DLT bulk rates, among the lowest in India. See DLT bulk SMS pricing<\/a>.<\/p>\nDo I need DLT registration?<\/h3>\n
For business SMS to Indian numbers, yes. It is one-time, and Fast2SMS DLT support does the heavy lifting free. The Quick SMS route works without it for permitted use cases.<\/p>\n
How many SMS can one API call send?<\/h3>\n
Pass a comma-separated list in numbers<\/code> and send to hundreds per call. For campaigns, batch your list and loop.<\/p>\nCan I schedule messages?<\/h3>\n
Yes. Add schedule_time<\/code> in DD-MM-YYYY-HH-MM format and the message goes out then.<\/p>\nHow do I get delivery status into my database?<\/h3>\n
Create an SMS webhook. Fast2SMS posts status updates to your URL as they happen. You can also fetch reports by request_id.<\/p>\n
Is there a WhatsApp API too?<\/h3>\n
Yes, same account and key. See the WhatsApp message API guide<\/a>.<\/p>\nGet your API key<\/h2>\n
Create your free account, grab the key from Dev API, and your first SMS can go out in the next five minutes.<\/p>\n