POSTSend OTP

Send a one-time password (OTP) to a customer's primary mobile number to start mobile verification.

POST/tools/kyc/mobile/otp

Sends an OTP to the customer's primary mobile number for verification. The response returns a transaction id and the OTP expiry timestamp; confirm the code the customer enters with the Verify OTP API.

Sample OTP SMS

text

134021 is the OTP to verify your mobile number.
- Eko India

By default the OTP SMS is sent with the Eko India sender signature. To send it under your own company signature and Sender ID, register on a telecom DLT platform as described below.

DLT registration for your own Sender ID

1. Register as a Principal Entity

Submit the requested business KYC documents, typically:

PAN and GST certificate
Business registration proof
Registered address proof
Authorised signatory details

After approval, save your Principal Entity ID (PE ID).

2. Register a Sender ID

In the DLT portal, register a new SMS Header or Sender ID.

Select the Others/Service header category — not Promotional.
Choose a sender name related to your registered entity or authorised brand.
Provide a justification or brand-authorisation document if the sender name differs from your legal entity name.
Sender IDs are case-sensitive.

Save the approved Header Name and Header ID.

3. Register the OTP content template

Create a content template using:

Field	Value
Communication type	Service Implicit
Channel	SMS
Language	English
Header	Your approved Sender ID

text

{#var#} is the OTP to verify your mobile number.
- Eko India

Note

Use your own company name instead of Eko India.
{#var#} represents the dynamically generated OTP.
Do not select Transactional unless the OTP is for a banking transaction performed by a bank.

4. Submit the approved details to Eko

Provide the following during API onboarding:

Principal Entity ID
Approved Sender ID/Header
Header ID
Content Template ID
Exact approved template text

Body parameters

Field	Type	Required	Description
`initiator_id`	string	required	Registered mobile number of the API user (see Platform Credentials).e.g. 9962981729
`client_ref_id`	string	optional	Unique reference id per API call, generated by your system.e.g. REQ-20260101-001
`csp_id`CSP ID	string	required	Customer Service Point id of the agent/retailer the OTP is being sent on behalf of.e.g. 9002336768
`mobile`Mobile Number	string	required	Customer's 10-digit primary mobile number to send the OTP to.e.g. 9002336768

initiator_idstringRequired

Registered mobile number of the API user (see Platform Credentials).

example: 9962981729

client_ref_idstringoptional

Unique reference id per API call, generated by your system.

example: REQ-20260101-001

csp_idstringRequired· CSP ID

Customer Service Point id of the agent/retailer the OTP is being sent on behalf of.

example: 9002336768

mobilestringRequired· Mobile Number

Customer's 10-digit primary mobile number to send the OTP to.

example: 9002336768

Headers

Field	Type	Required	Description
`developer_key`	string	required	Static API key issued to your account after KYC.
`secret-key`	string	required	Dynamic per-request signature: base64(HMAC-SHA256(timestamp, base64(access_key))).
`secret-key-timestamp`	string	required	Current time in milliseconds since UNIX epoch, used to compute secret-key. Must match server time.
`content-type`	string	required	application/jsone.g. application/json

developer_keystringRequired

Static API key issued to your account after KYC.

secret-keystringRequired

Dynamic per-request signature: base64(HMAC-SHA256(timestamp, base64(access_key))).

secret-key-timestampstringRequired

Current time in milliseconds since UNIX epoch, used to compute secret-key. Must match server time.

content-typestringRequired

application/json

example: application/json

Responses

statusnumber
Primary success indicator (0 = success).
messagestring
Human-readable response / error message.
response_status_idnumber
Granular status id; see the shared error-codes table.
response_type_idnumber
A unique id for every possible response shape (success or error) — useful for client logic branching and analytics.
dataobject
API-specific response payload.
- client_ref_idstring
  Unique reference id for this OTP request, echoed back.
- initiator_idstring
  Registered mobile number of the API user that initiated the call.
- otp_expiry_timestampstring
  Timestamp until which the OTP stays valid. Verify before this time.
- tidstring
  Unique transaction id for this OTP send, for tracking and support.