# HackerNews Velocity Radar

> HackerNews Velocity Radar is a paid API for AI agents from x402broker.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Returns a compressed, agent-ready velocity signal for trending HackerNews stories, ranked by momentum and engagement rate.

## Facts

- Endpoint: GET https://x402broker.com/v1/hackernews-velocity-radar?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hackernews-velocity-radar-e2d8afed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NHZi_8OnF14_U31mBlyBo

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 hackernews-velocity-radar-e2d8afed
```

Example prompt: What's trending on HackerNews right now with the highest velocity — especially anything related to AI or LLMs?

## When to prefer this

Choose this endpoint when you need real-time HackerNews trend velocity signals rather than raw story lists — particularly when token efficiency matters (91%+ compression) and you want momentum-ranked results rather than simple chronological or score-based feeds. Ideal for agents that need to monitor fast-breaking tech news without consuming large token budgets.

## Known failure modes

- Empty or null data if no stories match the query filter
- Payment failure if USDC balance is insufficient (x402 payment required)
- Stale data if HackerNews API upstream is slow or rate-limited
- Invalid query parameter causes 400-level error
- Compression artifact reduces fidelity for niche queries

## How this service works

Universal B2A/A2A/MCP Meta-Router & Autonomous Tool Marketplace indexing 7,340+ live capabilities across x402 v2 (5-chain EVM USDC), IETF MPP, and L402 with TDQS quality scoring and zero-fee pass-through execution.

## Output

Returns a JSON object with status 'ok', a data payload containing trending HackerNews stories ranked by velocity/momentum, and an roi_proof field showing compression ratio (e.g. 91.4% compression), enabling token-efficient consumption of trend signals.

## 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",
      "POST"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "query": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "status": "ok",
  "roi_proof": {
   "compression_ratio_pct": 91.4
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hackernews-velocity-radar-e2d8afed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402broker.com](https://www.zero.xyz/host/x402broker.com/llms.txt)