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Netzhandwerker Cohort Retention Analysis
x402
Netzhandwerker Cohort Retention Analysis is a paid API for AI agents from tools.halowerk.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-12).
Builds a cohort retention table from raw events, grouping users by their first-event period and tracking re-engagement across subsequent periods, with optional value accumulation metrics.
Price / call$0.002
Success—
StatusUnknown
How this service works
Builds the cohort table from the events you pass: users grouped by the period of their first event, counted again in each following period. Returns the table per cohort, a retention curve across all cohorts, and, where events carry a value, cumulative value and value per user. The curve counts only cohorts old enough for a given period, so a young cohort is not scored as churn. Day, week and month are real calendar periods. Nothing is fetched, nothing is stored.
Output
Returns a per-cohort retention table showing user counts in each subsequent period, a blended retention curve across all cohorts (excluding cohorts too young to score a given period), and — when events carry a value field — cumulative value and value-per-user metrics per cohort per period.
Example use cases
SaaS monthly user retention dashboard
“I have 3,000 user events from our app over the last 6 months. Can you group users into monthly cohorts based on when they first signed up and show me how many returned in each of the following 6 months? Period should be month, and only 'login' events should count as retention.”
Mobile game weekly re-engagement analysis
“Analyze these player events to show me weekly cohort retention for the past 12 weeks — players enter a cohort on their first 'level_start' event and are counted as retained in later weeks if they trigger any 'level_start' or 'level_complete' event. Start weeks on Sunday.”
E-commerce cohort revenue tracking
“Here are purchase events with values for 2,000 customers over the last 8 weeks. Group customers into weekly cohorts by their first purchase and show me cumulative revenue and revenue per user for each cohort across all 8 periods.”
Technical details
Endpoint
POSThttps://tools.halowerk.com/v1/cohort/retention?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you have raw event logs and want server-side cohort grouping and retention curve computation without storing data or implementing period-boundary logic yourself. It is especially useful when you need real calendar periods (day/week/month) with correct timezone alignment, want to separate activation events from retention events, or need cumulative value metrics alongside user counts. Prefer it over spreadsheet or client-side solutions when event volume is up to 4,000 records and you want a stateless, pay-per-call computation.
Side effects
- Events missing user_id or timestamp fields return a validation error
- Unknown field names in event objects are rejected rather than silently ignored
- Request body exceeding 256 KB is rejected regardless of item count
- Invalid timezone_offset_s outside [-50400, 50400] range returns an error
- Periods value exceeding 52 causes a validation error
- activation_type or retention_types referencing event types not present in the data return empty cohorts without error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| events | array | Each event needs user_id and a timestamp (time_unix_s in seconds since 1970, or time as ISO 8601). Optional: type and value. Any other field name is rejected rather than guessed. The service caps the whole request body at 256 KB, so long records reach that limit before maxItems. |
| period | string | |
| periods | integer | How many periods the table runs, period 0 being the entry period. |
| week_start | string | |
| activation_type | string | If set, only events of this type put a user into a cohort. Without it the first event of any type counts. |
| retention_types | array | If set, only events of these types count as being active. Without it every event counts. |
| timezone_offset_s | integer | Offset from UTC in seconds used to place period boundaries. |
Tags
x402
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