# ArgonautWorks Crypto Headline Pulse API

> ArgonautWorks Crypto Headline Pulse API is a paid API for AI agents from argonaut-crypto-headline-pulse.vercel.app, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-11).

Fetches fresh crypto news headlines from four independent publisher feeds (CoinDesk, Decrypt, Ethereum Foundation, The Block), optionally filtered by topic keyword, returning source-linked articles with summaries and categories.

## Facts

- Endpoint: GET https://argonaut-crypto-headline-pulse.vercel.app/api/v1/headlines?utm_source=zero.xyz
- Price: $0.007/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/argonautworks-crypto-headline-pulse-api-7743a156
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YeVFd1M_xMk-XEvD3lV3W

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 argonautworks-crypto-headline-pulse-api-7743a156
```

Example prompt: Pull the latest 15 crypto headlines about Ethereum from the ArgonautWorks Headline Pulse — give me titles, sources, and summaries.

## When to prefer this

Choose this endpoint when you need real, source-linked crypto news headlines from established publishers (CoinDesk, Decrypt, Ethereum Foundation, The Block) without AI-generated or hallucinated claims. It's ideal for agents that need deterministic topic filtering across up to four live feeds in a single call, and where provenance and publisher attribution matter. Prefer it over general web search when you want structured, consistently formatted crypto news with categories and summaries already attached.

## Known failure modes

- One or more publisher feeds unresponsive — reflected in sources.failed array with partial results still returned
- topic parameter too long (>80 chars) — validation error
- limit out of range (<1 or >20) — validation error
- No headlines match the topic filter — returns empty headlines array with match_count of 0
- Vercel cold start causing slightly elevated latency on first request

## How this service works

Fresh crypto news and source-linked Bitcoin, Ethereum, Base, and market headlines from four independent publisher feeds, with deterministic topic filtering and no generated claims.

## Output

A JSON object containing the requested headlines array (each with title, URL, source, summary, categories, and published_at), the total match_count, an observed_at timestamp, the active topic filter if any, the limit applied, and a sources breakdown showing which of the four configured publishers (CoinDesk, Decrypt, Ethereum Foundation, The Block) were responsive versus failed.

## 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",
     "properties": {
      "limit": {
       "type": "integer",
       "default": 10,
       "maximum": 20,
       "minimum": 1
      },
      "topic": {
       "type": "string",
       "maxLength": 80,
       "minLength": 1,
       "description": "Optional case-insensitive phrase matched against headlines, summaries, and categories."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "limit": 10,
  "topic": "base",
  "sources": {
   "failed": [],
   "configured": [
    "CoinDesk",
    "Decrypt",
    "Ethereum Foundation",
    "The Block"
   ],
   "responsive": [
    "CoinDesk",
    "Decrypt",
    "Ethereum Foundation",
    "The Block"
   ]
  },
  "headlines": [
   {
    "url": "https://publisher.example/story",
    "title": "Example headline",
    "source": "Publisher",
    "summary": "Short publisher-provided summary.",
    "categories": [
     "Markets"
    ],
    "published_at": "2026-08-04T21:00:00.000Z"
   }
  ],
  "match_count": 3,
  "observed_at": "2026-08-04T21:30:00.000Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/argonautworks-crypto-headline-pulse-api-7743a156/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from argonaut-crypto-headline-pulse.vercel.app](https://www.zero.xyz/host/argonaut-crypto-headline-pulse.vercel.app/llms.txt)