Subject Line Analysis (Coming Soon)

POST

/api/v3/letters/subject-line-analyses

Subject Line Analysis (Coming Soon)

Authorizations

• bearerAuth

Request Body

Media type application/json

object

api

boolean

isTopPerformer

boolean

subject

string

Examples

Example Subject Line Analysis (Coming Soon)

{
  "api": true,
  "isTopPerformer": true,
  "subject": "Your newsletter subject line here"
}

Responses

200

Subject Line Analysis (Coming Soon)

Media type application/json

object

items

object

analysis

string

message

string

total

number

Examples

Example Subject Line Analysis (Coming Soon)

{
  "items": {
    "analysis": "The subject line \"Your newsletter subject line here\" likely performed well due to its clear personalization, making recipients feel directly addressed and engaged. While it doesn't employ urgency or curiosity, its straightforwardness and relevance suggest that subscribers recognized it as directly related to their interests, enhancing open rates. The medium length keeps it concise, while the informative tone assures recipients of its value, contributing positively to their decision to open the email."
  },
  "message": "Do something kind today",
  "total": 1
}

Headers

Alt-Svc

string

Example

h3=":443"; ma=2592000,h3-29=":443"; ma=2592000

Transfer-Encoding

string

Example

chunked

access-control-allow-credentials

string

Example

true

access-control-allow-origin

string

Example

*

access-control-max-age

string

Example

86400

cache-control

string

Example

no-cache, private

date

string

Example

Wed, 18 Mar 2026 23:01:30 GMT

server

string

Example

nginx/1.27.3

via

string

Example

1.1 google

x-powered-by

string

Example

PHP/7.4.33