curl --request POST \
--url https://api.superx.so/v1/signals/icp/expand \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"icp_description": "Indie founders building SaaS in public"
}
'import requests
url = "https://api.superx.so/v1/signals/icp/expand"
payload = { "icp_description": "Indie founders building SaaS in public" }
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({icp_description: 'Indie founders building SaaS in public'})
};
fetch('https://api.superx.so/v1/signals/icp/expand', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.superx.so/v1/signals/icp/expand",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'icp_description' => 'Indie founders building SaaS in public'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.superx.so/v1/signals/icp/expand"
payload := strings.NewReader("{\n \"icp_description\": \"Indie founders building SaaS in public\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.superx.so/v1/signals/icp/expand")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"icp_description\": \"Indie founders building SaaS in public\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.superx.so/v1/signals/icp/expand")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"icp_description\": \"Indie founders building SaaS in public\"\n}"
response = http.request(request)
puts response.read_body{
"data": {
"rubric": {
"who": "Solo founders shipping a SaaS product in public",
"needs": [
"growing an audience while building",
"launch distribution"
],
"disqualifiers": [
"agency owners",
"accounts that only repost"
],
"example_match": "building my SaaS in public, $2k MRR, shipping weekly",
"example_non_match": "growth agency for SaaS brands, DM for rates"
}
}
}{
"error": {
"code": "invalid_parameter",
"message": "since must be a UTC ISO-8601 timestamp"
}
}{
"error": {
"code": "invalid_api_key",
"message": "Unknown or revoked API key"
}
}{
"error": {
"code": "insufficient_scope",
"message": "This API key is read-only. Create a key with the write scope to use this endpoint."
}
}{
"error": {
"code": "account_not_found",
"message": "No account with that id belongs to this key"
}
}{
"error": {
"code": "rate_limited",
"message": "Rate limit exceeded for the Pro plan (30 requests/min). Upgrade for higher limits.",
"retry_after": 42
}
}{
"error": {
"code": "internal_error",
"message": "Failed to fetch posts"
}
}{
"error": {
"code": "upstream_error",
"message": "Failed to fetch scheduled posts. Try again shortly."
}
}{
"error": {
"code": "accounts_unavailable",
"message": "Account information is temporarily unavailable. Try again shortly."
}
}Expand an audience description into a rubric
Turns a plain description of an audience into the structured rubric signal agents score people against: who the ideal customer is, the needs that make someone a fit, the disqualifiers, and one example of a match and a non-match.
Free. Nothing is created and no AI credits are charged. The rubric is
a reading of the description rather than a field you can store:
agents are created with icp_description, so use this to sharpen
that text before calling POST /v1/signals/agents, or to score
people yourself.
This helper runs in SuperX’s own process rather than through the app, so the app’s short-term limiter does not apply and your plan’s request rate limit is the only bound. It is still a model call each time, so keep it occasional.
Needs a key with the write scope. Every non-GET route on this API
does, and this one is a POST because the description goes in the
body; it still creates nothing.
curl --request POST \
--url https://api.superx.so/v1/signals/icp/expand \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"icp_description": "Indie founders building SaaS in public"
}
'import requests
url = "https://api.superx.so/v1/signals/icp/expand"
payload = { "icp_description": "Indie founders building SaaS in public" }
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({icp_description: 'Indie founders building SaaS in public'})
};
fetch('https://api.superx.so/v1/signals/icp/expand', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.superx.so/v1/signals/icp/expand",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'icp_description' => 'Indie founders building SaaS in public'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.superx.so/v1/signals/icp/expand"
payload := strings.NewReader("{\n \"icp_description\": \"Indie founders building SaaS in public\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Authorization", "Bearer <token>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://api.superx.so/v1/signals/icp/expand")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"icp_description\": \"Indie founders building SaaS in public\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.superx.so/v1/signals/icp/expand")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"icp_description\": \"Indie founders building SaaS in public\"\n}"
response = http.request(request)
puts response.read_body{
"data": {
"rubric": {
"who": "Solo founders shipping a SaaS product in public",
"needs": [
"growing an audience while building",
"launch distribution"
],
"disqualifiers": [
"agency owners",
"accounts that only repost"
],
"example_match": "building my SaaS in public, $2k MRR, shipping weekly",
"example_non_match": "growth agency for SaaS brands, DM for rates"
}
}
}{
"error": {
"code": "invalid_parameter",
"message": "since must be a UTC ISO-8601 timestamp"
}
}{
"error": {
"code": "invalid_api_key",
"message": "Unknown or revoked API key"
}
}{
"error": {
"code": "insufficient_scope",
"message": "This API key is read-only. Create a key with the write scope to use this endpoint."
}
}{
"error": {
"code": "account_not_found",
"message": "No account with that id belongs to this key"
}
}{
"error": {
"code": "rate_limited",
"message": "Rate limit exceeded for the Pro plan (30 requests/min). Upgrade for higher limits.",
"retry_after": 42
}
}{
"error": {
"code": "internal_error",
"message": "Failed to fetch posts"
}
}{
"error": {
"code": "upstream_error",
"message": "Failed to fetch scheduled posts. Try again shortly."
}
}{
"error": {
"code": "accounts_unavailable",
"message": "Account information is temporarily unavailable. Try again shortly."
}
}Authorizations
A SuperX API key ("sxk_..."), created in the SuperX app under Account > API / MCP / CLI. Keys are server-side secrets.
Body
Response
The scoring rubric.
Show child attributes
Show child attributes