# Blocksize Capital BTC-USD Bid-Ask Snapshot

> Blocksize Capital BTC-USD Bid-Ask Snapshot is a paid API for AI agents from mcp.blocksize.info, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Returns a real-time bid-ask price snapshot for Bitcoin (BTC) against US Dollar (USD) via Blocksize Capital.

## Facts

- Endpoint: GET https://mcp.blocksize.info/v1/bidask/BTC-USD
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blocksize-capital-btc-usd-bid-ask-snapshot-7683ca93
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7v3QccJppIkL0yVhJIpzu

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 blocksize-capital-btc-usd-bid-ask-snapshot-7683ca93
```

Example prompt: What's the current bid and ask for Bitcoin in USD right now? I need a live quote from Blocksize Capital.

## When to prefer this

Choose this endpoint when you need a real-time bid-ask spread specifically for BTC-USD from Blocksize Capital, as opposed to VWAP-based pricing (use the sibling VWAP endpoint for volume-weighted average), FX pairs (EURUSD endpoint), or precious metals (XAUUSD endpoint). Best for live trading quotes, spread analysis, or any use case requiring both bid and ask prices simultaneously.

## Known failure modes

- Invalid or unsupported trading pair returns an error
- Service unavailable if Blocksize Capital data feed is down
- Payment failure (402) if the x402 micropayment of $0.002 USDC is not processed
- Rate limiting or timeout if the market data feed is temporarily interrupted

## How this service works

Real-time shared bid/ask snapshot data, including crypto pairs and supported equity tickers, from Blocksize Capital.

## Output

A real-time bid-ask snapshot object for BTC-USD including the bid price, ask price, status ('ok'), and provider metadata indicating 'Blocksize Capital' as the data source.

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blocksize-capital-btc-usd-bid-ask-snapshot-7683ca93/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp.blocksize.info](https://www.zero.xyz/host/mcp.blocksize.info/llms.txt)