Preview segment size
Count the people a draft definition matches, without saving it. Readable with an agency key (ak_, plus ?location_id=), a viewer key (sk_) or an mcp_ key with segments:read. Attribute-only drafts are counted at read time. Drafts with events run the membership query live, so a preview costs the same as one membership refresh.
curl -X POST "https://mythic-analytics.gulp.workers.dev/builder/segments/preview?location_id=acme-retail" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer YOUR_API_TOKEN" \
-d '{
"definition": {
"events": [
{
"event": "Purchase",
"within_days": 30,
"min_count": 10,
"filters": [
{
"property": "$pathname",
"op": "eq",
"value": "example_string"
}
]
}
],
"attribution": "first",
"search": "acme",
"has_email": true,
"channel": "organic",
"utm_source": "google",
"utm_medium": "cpc",
"utm_campaign": "example_string",
"country": "US",
"device_type": "mobile",
"min_sessions": 3,
"min_identities": 2,
"active_within_days": 30,
"inactive_days": 90,
"first_seen_within_days": 7
}
}'
import requests
import json
url = "https://mythic-analytics.gulp.workers.dev/builder/segments/preview?location_id=acme-retail"
headers = {
"Content-Type": "application/json",
"Authorization": "Bearer YOUR_API_TOKEN"
}
data = {
"definition": {
"events": [
{
"event": "Purchase",
"within_days": 30,
"min_count": 10,
"filters": [
{
"property": "$pathname",
"op": "eq",
"value": "example_string"
}
]
}
],
"attribution": "first",
"search": "acme",
"has_email": true,
"channel": "organic",
"utm_source": "google",
"utm_medium": "cpc",
"utm_campaign": "example_string",
"country": "US",
"device_type": "mobile",
"min_sessions": 3,
"min_identities": 2,
"active_within_days": 30,
"inactive_days": 90,
"first_seen_within_days": 7
}
}
response = requests.post(url, headers=headers, json=data)
print(response.json())
const response = await fetch("https://mythic-analytics.gulp.workers.dev/builder/segments/preview?location_id=acme-retail", {
method: "POST",
headers: {
"Content-Type": "application/json",
"Authorization": "Bearer YOUR_API_TOKEN"
},
body: JSON.stringify({
"definition": {
"events": [
{
"event": "Purchase",
"within_days": 30,
"min_count": 10,
"filters": [
{
"property": "$pathname",
"op": "eq",
"value": "example_string"
}
]
}
],
"attribution": "first",
"search": "acme",
"has_email": true,
"channel": "organic",
"utm_source": "google",
"utm_medium": "cpc",
"utm_campaign": "example_string",
"country": "US",
"device_type": "mobile",
"min_sessions": 3,
"min_identities": 2,
"active_within_days": 30,
"inactive_days": 90,
"first_seen_within_days": 7
}
})
});
const data = await response.json();
console.log(data);
package main
import (
"fmt"
"net/http"
"bytes"
"encoding/json"
)
func main() {
data := []byte(`{
"definition": {
"events": [
{
"event": "Purchase",
"within_days": 30,
"min_count": 10,
"filters": [
{
"property": "$pathname",
"op": "eq",
"value": "example_string"
}
]
}
],
"attribution": "first",
"search": "acme",
"has_email": true,
"channel": "organic",
"utm_source": "google",
"utm_medium": "cpc",
"utm_campaign": "example_string",
"country": "US",
"device_type": "mobile",
"min_sessions": 3,
"min_identities": 2,
"active_within_days": 30,
"inactive_days": 90,
"first_seen_within_days": 7
}
}`)
req, err := http.NewRequest("POST", "https://mythic-analytics.gulp.workers.dev/builder/segments/preview?location_id=acme-retail", bytes.NewBuffer(data))
if err != nil {
panic(err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Authorization", "Bearer YOUR_API_TOKEN")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
fmt.Println("Response Status:", resp.Status)
}
require 'net/http'
require 'json'
uri = URI('https://mythic-analytics.gulp.workers.dev/builder/segments/preview?location_id=acme-retail')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request['Authorization'] = 'Bearer YOUR_API_TOKEN'
request.body = '{
"definition": {
"events": [
{
"event": "Purchase",
"within_days": 30,
"min_count": 10,
"filters": [
{
"property": "$pathname",
"op": "eq",
"value": "example_string"
}
]
}
],
"attribution": "first",
"search": "acme",
"has_email": true,
"channel": "organic",
"utm_source": "google",
"utm_medium": "cpc",
"utm_campaign": "example_string",
"country": "US",
"device_type": "mobile",
"min_sessions": 3,
"min_identities": 2,
"active_within_days": 30,
"inactive_days": 90,
"first_seen_within_days": 7
}
}'
response = http.request(request)
puts response.body
{
"count": 1284
}
{
"error": "Bad Request",
"message": "The request contains invalid parameters or malformed data",
"code": 400,
"details": [
{
"field": "email",
"message": "Invalid email format"
}
]
}
{
"error": "Unauthorized",
"message": "Authentication required. Please provide a valid API token",
"code": 401
}
{
"error": "Error",
"message": "The live membership query failed upstream",
"code": 502
}
/segments/preview
Target server for requests. Edit to use your own host.
Builder key as a bearer token. Use an agency key for full CRUD (Bearer ak_...) or a viewer key for read-only access (Bearer sk_...). Scoped keys (mcp_) are accepted too and need segments:read or segments:write. See Using an mcp_ key over HTTP.
Bearer ak_...) or a viewer key for read-only access (Bearer sk_...). Scoped keys (mcp_) are accepted too and need segments:read or segments:write. See Using an mcp_ key over HTTP.Client location to scope the request to. Required when authenticating with an agency key (ak_). Ignored for viewer keys (sk_).
The media type of the request body
Person-attribute filters plus an optional events list of event conditions. Everything present combines with AND. Any subset may be used; at least one filter or condition is required. Unknown keys are rejected.
Examples: { "events": [{ "event": "Purchase" }] } = people who have ever done Purchase. { "events": [{ "event": "$pageview", "within_days": 30, "filters": [{ "property": "$pathname", "op": "eq", "value": "/xyz" }] }] } = people who visited /xyz in the last 30 days.
The attribution field picks which touch the attribution filters (channel, utm_source, utm_medium, utm_campaign, country, device_type) match against — last (default), first, or session. Example: { "utm_source": "fb", "attribution": "session" } = "everyone who ever had a session that arrived via fb".
Request Preview
Response
Response will appear here after sending the request
Authentication
Bearer token. Builder key as a bearer token. Use an agency key for full CRUD (Bearer ak_...) or a viewer key for read-only access (Bearer sk_...). Scoped keys (mcp_) are accepted too and need segments:read or segments:write. See Using an mcp_ key over HTTP.
Query Parameters
Client location to scope the request to. Required when authenticating with an agency key (ak_). Ignored for viewer keys (sk_).
acme-retailBody
Person-attribute filters plus an optional events list of event conditions. Everything present combines with AND. Any subset may be used; at least one filter or condition is required. Unknown keys are rejected.
Examples: { "events": [{ "event": "Purchase" }] } = people who have ever done Purchase. { "events": [{ "event": "$pageview", "within_days": 30, "filters": [{ "property": "$pathname", "op": "eq", "value": "/xyz" }] }] } = people who visited /xyz in the last 30 days.
The attribution field picks which touch the attribution filters (channel, utm_source, utm_medium, utm_campaign, country, device_type) match against — last (default), first, or session. Example: { "utm_source": "fb", "attribution": "session" } = "everyone who ever had a session that arrived via fb".
Responses
Distinct people matching the draft right now.