# d21 Social Trends Pulse

> d21 Social Trends Pulse is a paid API for AI agents from draconic21-x402-api.onrender.com, paid per call via x402, $0.015/call, status unknown (last checked 2026-10-12).

Aggregates and deduplicates trending topics from Hacker News, Lobsters, Mastodon, and Wikipedia into a single ranked feed

## Facts

- Endpoint: POST https://draconic21-x402-api.onrender.com/v1/social_trends_pulse?utm_source=zero.xyz
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/d21-social-trends-pulse-b615e00e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_j9IjzBfTclWUamWXIy94m

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 d21-social-trends-pulse-b615e00e -d '<json body>'
```

Example prompt: Pull the top 10 trending topics right now from Hacker News, Lobsters, Mastodon, and Wikipedia all merged together into one ranked list.

## When to prefer this

Choose this endpoint when you need a multi-source, deduplicated trending topics feed that spans both tech/developer communities (Hacker News, Lobsters) and broader social/encyclopedia sources (Mastodon, Wikipedia) in a single ranked list. It is cheaper than calling wiki_trends_pulse alone and provides broader coverage. Prefer it over single-source trend APIs when cross-platform consensus on trending topics matters, or when you want to reduce noise through deduplication across sources.

## Known failure modes

- Invalid source name in sources array returns validation error
- Limit out of range (below 1 or above 20) returns validation error
- One or more upstream sources (e.g. Mastodon, Wikipedia) temporarily unavailable may result in partial results or error
- Payment not provided or insufficient USDC results in 402 payment required response
- Rate limiting or server overload on render.com host may cause timeout

## How this service works

Social Trends Pulse ($0.015): multi-source trending-topics feed for the demand-radar's #1-observed-demand category ("social media trends") — aggregated live from Hacker News, Lobsters, Mastodon, and Wikipedia (via this origin's own wiki_trends_pulse), deduped/merged across sources into one ranked topics list. Cheaper than wiki_trends_pulse, more sources. Body { sources?: subset of [hackernews, lobsters, mastodon, wikipedia], limit?: 1..20 }. Check free /v1/social_trends_pulse/availability first.

## Output

A ranked, deduplicated list of up to 20 trending topics aggregated from the selected sources (Hacker News, Lobsters, Mastodon, Wikipedia), with each topic attributed to its source(s) and ranked by observed demand signal strength.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer",
   "maximum": 20,
   "minimum": 1,
   "description": "Max merged topics returned (default 10)"
  },
  "sources": {
   "type": "array",
   "items": {
    "enum": [
     "hackernews",
     "lobsters",
     "mastodon",
     "wikipedia"
    ],
    "type": "string"
   },
   "description": "Subset of sources to query (default: all 4)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/d21-social-trends-pulse-b615e00e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from draconic21-x402-api.onrender.com](https://www.zero.xyz/host/draconic21-x402-api.onrender.com/llms.txt)