MCP Tool · x402 · active demand

Real-time shared bid/ask snapshot data, including crypto pairs and supported equity tic…

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

by mcp.blocksize.info · discovered, not yet claimed by its owner · updated 2026-10-13

30d calls48

30d payers10

MethodGET

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

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

Tags: bazaar

Call contract

Method: GET
Input: query parameters
Output: json
Last paid call: 2026-10-13

Input example from Bazaar metadata

{}

Output example

{
  "data": {
    "ask": 101,
    "bid": 99,
    "pair": "BTC-USD",
    "source": "blocksize",
    "spread": 2,
    "spread_pct": 2,
    "timestamp": "2020-01-01T00:00:00Z"
  },
  "meta": {
    "example_only": true,
    "provider": "Blocksize Capital"
  },
  "status": "ok"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/30455.json for the price and payment options.
Pay. Call GET https://mcp.blocksize.info/v1/bidask/BTC-USD. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Solana, Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.002 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Solana, Base
Demand: 48 calls · 10 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.002	9qCyPu7sLjnwgcbHYY76eqvtjsrdDxis9nn1sjD8CyJo	30s
exact	Base eip155:8453	USDC	$0.002	0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe	60s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "9qCyPu7sLjnwgcbHYY76eqvtjsrdDxis9nn1sjD8CyJo",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "2000",
    "amountUsd": 0.002,
    "maxTimeoutSeconds": 30
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "amountUsd": 0.002,
    "maxTimeoutSeconds": 60
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "description": "Illustrative response; never live market data.",
      "properties": {
        "data": {
          "description": "Best bid/ask snapshot for a trading pair.",
          "properties": {
            "ask": {
              "description": "Best ask price",
              "title": "Ask",
              "type": "number"
            },
            "bid": {
              "description": "Best bid price",
              "title": "Bid",
              "type": "number"
            },
            "pair": {
              "description": "Trading pair",
              "title": "Pair",
              "type": "string"
            },
            "source": {
              "default": "blocksize",
              "description": "Data provider identifier",
              "title": "Source",
              "type": "string"
            },
            "spread": {
              "description": "Absolute spread (ask - bid)",
              "title": "Spread",
              "type": "number"
            },
            "spread_pct": {
              "description": "Spread as percentage",
              "title": "Spread Pct",
              "type": "number"
            },
            "timestamp": {
              "description": "Data timestamp (UTC)",
              "format": "date-time",
              "title": "Timestamp",
              "type": "string"
            }
          },
          "required": [
            "pair",
            "bid",
            "ask",
            "spread",
            "spread_pct",
            "timestamp"
          ],
          "title": "BidAskData",
          "type": "object"
        },
        "meta": {
          "type": "object"
        },
        "status": {
          "type": "string"
        }
      },
      "required": [
        "status",
        "data",
        "meta"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "data": {
      "ask": 0,
      "bid": 0,
      "pair": "string",
      "source": "blocksize",
      "spread": 0,
      "spread_pct": 0,
      "timestamp": "2026-01-01T00:00:00Z"
    },
    "meta": {},
    "status": "string"
  },
  "type": "string"
}

Examples

curl

curl "https://mcp.blocksize.info/v1/bidask/BTC-USD"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://mcp.blocksize.info/v1/bidask/BTC-USD");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://mcp.blocksize.info/v1/bidask/BTC-USD")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: mcp.blocksize.info
Endpoint: https://mcp.blocksize.info/v1/bidask/BTC-USD
Machine-readable: /resources/30455.json