# Horizon Pulse Discourse Split

> Horizon Pulse Discourse Split is a paid API for AI agents from horizonpulse.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-18).

Samples public Hacker News and Bluesky posts to show how online discourse splits on a yes/no (or multi-sided) question, with confidence intervals and source links.

## Facts

- Endpoint: GET https://horizonpulse.dev/api/discourse/split?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/horizon-pulse-discourse-split-420206be
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_C_GwHdm0TPZZ8BQ2IKN9C

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability horizon-pulse-discourse-split-420206be
```

Example prompt: Can you check how public discourse on Hacker News and Bluesky splits on whether AI will replace software engineers — use a 7-day window and give me the yes/no breakdown with confidence intervals?

## When to prefer this

Use this endpoint when you need a quick, quantified read on how public online discourse divides on a topic specifically within the Hacker News and Bluesky communities, with statistical confidence intervals. Prefer it over general web search or sentiment APIs when you want side-labeled share percentages with sourced post links and explicit caveats. Avoid it for election, health, or named-individual conduct questions, or when you need broader social media coverage beyond HN and Bluesky.

## Known failure modes

- Question involves elections or candidates — refused, not charged
- Question involves health topics — refused, not charged
- Question involves a named person's conduct — refused, not charged
- Fewer than 30 decided posts found in window — result flagged or not charged
- Invalid window format (must be 1-30d) — error response
- Invalid sides count (must be 2-4 comma-separated labels) — error response
- Question too short (<3 chars) or too long (>200 chars) — validation error

## How this service works

Hacker News and Bluesky opinion split, NOT a poll: how public posts divide on a question. GET q; optional sides (2-4, default yes,no), window (1-30d). Returns JSON: per-side share with 95% interval and n, counts per source, links only (no text or usernames; Bluesky links include the account's public ID, DID), caveats. Refuses elections, health and a named person's conduct. Under 30 decided posts, refusals and errors: not charged.

## Output

A JSON object containing: per-side share percentages with 95% confidence intervals and post counts, post counts broken down by source (Hacker News, Bluesky), links to the sampled posts (no post text or usernames; Bluesky links include the account's public DID), and caveats clarifying this is an online discourse sample not a scientific poll. Calls returning fewer than 30 decided posts, refusals, or errors are not charged.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Question or topic, 3-200 chars (required). Elections/candidates, health, and a named person's conduct are refused (not charged)."
      },
      "sides": {
       "type": "string",
       "description": "2-4 comma-separated side labels (default yes,no)."
      },
      "window": {
       "type": "string",
       "description": "Look-back window 1-30 days, e.g. 7d (default 30d)."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "description": "Horizon Pulse online discourse split (NOT a poll): shares with 95% intervals, counts and source links. The example is a trimmed real response recorded from GET /api/demo/discourse-split at 2026-10-16T17:16Z UTC; live values differ on every call."
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/horizon-pulse-discourse-split-420206be/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from horizonpulse.dev](https://www.zero.xyz/host/horizonpulse.dev/llms.txt)