# x402 Crypto Market Brief

> x402 Crypto Market Brief is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Returns a single-call crypto market snapshot covering Fear & Greed index, global market cap/dominance, top movers, trending coins, and top DeFi fee earners.

## Facts

- Endpoint: GET https://x402-data-api.sigrunner.workers.dev/brief/market?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-crypto-market-brief-79a4a48f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CvkYapX2n4ag63_ipd4Vz

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 x402-crypto-market-brief-79a4a48f
```

Example prompt: Give me a full crypto market snapshot right now — I want the Fear & Greed score, BTC dominance, top gainers and losers, trending coins, and the DeFi protocols earning the most fees, all in one shot.

## When to prefer this

Choose this endpoint when you need a comprehensive crypto market overview in a single API call rather than assembling data from multiple endpoints. It is ideal for agents that need to make holistic market assessments, generate market summaries, or gate trading decisions on market sentiment without paying for and orchestrating multiple separate data calls. Prefer it over individual market data endpoints when breadth matters more than depth on any single metric.

## Known failure modes

- Payment failure if USDC balance is insufficient for the $0.01 per-call fee
- 503/timeout if upstream data providers (CoinGecko, etc.) are unavailable
- Stale data if upstream sources haven't refreshed recently
- Rate limiting if too many calls are made in a short window

## How this service works

One-call crypto market brief: Fear & Greed, global market cap/dominance, top movers, trending coins and top DeFi fee earners. No params. Use when an agent needs a full market snapshot in a single payment.

## Output

A JSON object containing: Fear & Greed index value and classification (e.g. 'Greed'), global market stats including BTC dominance percentage and total market cap, top gaining and losing coins, trending cryptocurrency list, and top DeFi protocols ranked by fee revenue — all in a single response.

## 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": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "fear_greed",
      "global",
      "movers"
     ],
     "properties": {
      "global": {
       "type": "object",
       "required": [
        "btc_dominance_pct"
       ],
       "properties": {
        "btc_dominance_pct": {
         "type": "number"
        }
       }
      },
      "movers": {
       "type": "object",
       "required": [
        "gainers",
        "losers"
       ],
       "properties": {
        "losers": {
         "type": "array",
         "items": {}
        },
        "gainers": {
         "type": "array",
         "items": {}
        }
       }
      },
      "fear_greed": {
       "type": "object",
       "required": [
        "value",
        "classification"
       ],
       "properties": {
        "value": {
         "type": "integer"
        },
        "classification": {
         "type": "string"
        }
       }
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "global": {
   "btc_dominance_pct": 57.1
  },
  "movers": {
   "losers": [],
   "gainers": []
  },
  "fear_greed": {
   "value": 59,
   "classification": "Greed"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-crypto-market-brief-79a4a48f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-data-api.sigrunner.workers.dev](https://www.zero.xyz/host/x402-data-api.sigrunner.workers.dev/llms.txt)