mcp.blocksize.info

Name: mcp.blocksize.info
Price: 0.005 USDC
Availability: InStock

Find live market data and decision-ready agent workflows: Blocksize provides crypto VWAP, supported equity ticker bid/ask, FX, metals, AMM state prices, VWAP windows, market briefs, macro snapshots, and trader indicators through remote MCP discovery and x402-paid HTTP APIs.

OtherLiveeip155:8453Exactvia facilitator:thirdweb

https://mcp.blocksize.info/v1/metal/XAUUSD

Calls · 30d

7→ 0%

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far.

$0.21

Verified settled volume

80 settlements proven x402 by their on-chain EIP-3009 marker.

$0.0050

Listed price

As published in the catalog. Always read the live 402 before paying.

—

Calls · 30d

Upstream's own call count for this endpoint, not ours.

—

Unique payers · 30d

Never called

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "Payment Required",
  "accepts": [
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88",
        "resource": "https://mcp.blocksize.info/v1/metal/XAUUSD"
      },
      "payTo": "9qCyPu7sLjnwgcbHYY76eqvtjsrdDxis9nn1sjD8CyJo",
      "amount": "5000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 30
    },
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "resource": "https://mcp.blocksize.info/v1/metal/XAUUSD"
      },
      "payTo": "0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    }
  ],
  "message": "This endpoint requires a payment of $0.005 USDC. Send a signed x402 v2 payment in the PAYMENT-SIGNATURE header. Accepted networks: Solana, Base L2.",
  "networks": [
    {
      "name": "Solana",
      "caip2": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
    },
    {
      "name": "Base L2",
      "caip2": "eip155:8453"
    }
  ],
  "resource": {
    "url": "https://mcp.blocksize.info/v1/metal/XAUUSD",
    "mimeType": "application/json",
    "description": "Real-time precious metals market data from Blocksize Capital."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "data": {
              "name": "",
              "price": 100,
              "source": "blocksize",
              "ticker": "XAUUSD",
              "currency": "USD",
              "timestamp": "2020-01-01T00:00:00Z"
            },
            "meta": {
              "provider": "Blocksize Capital",
              "example_only": true
            },
            "status": "ok"
          }
        }
      },
      "schema": {
        "type": "object",
        "$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": {
                "type": "string",
                "const": "GET"
              },
              "queryParams": {
                "type": "object",
                "properties": {},
                "additionalProperties": false
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "required": [
                  "status",
                  "data",
                  "meta"
                ],
                "properties": {
                  "data": {
                    "type": "object",
                    "title": "MetalData",
                    "required": [
                      "ticker",
                      "price",
                      "timestamp"
                    ],
                    "properties": {
                      "name": {
                        "type": "string",
                        "title": "Name",
                        "default": "",
                        "description": "Metal name (e.g., Gold)"
                      },
                      "price": {
                        "type": "number",
                        "title": "Price",
                        "description": "Spot price in USD"
                      },
                      "source": {
                        "type": "string",
                        "title": "Source",
                        "default": "blocksize",
                        "description": "Data provider"
                      },
                      "ticker": {
                        "type": "string",
                        "title": "Ticker",
                        "description": "Metal ticker (e.g., XAUUSD)"
                      },
                      "currency": {
                        "type": "string",
                        "title": "Currency",
                        "default": "USD",
                        "description": "Quote currency"
                      },
                      "timestamp": {
                        "type": "string",
                        "title": "Timestamp",
                        "format": "date-time",
                        "description": "Data timestamp (UTC)"
                      }
                    },
                    "description": "Precious/base metal spot price data."
                  },
                  "meta": {
                    "type": "object"
                  },
                  "status": {
                    "type": "string"
                  }
                },
                "description": "Illustrative response; never live market data."
              }
            }
          }
        }
      }
    }
  },
  "price_usdc": "0.005",
  "x402Version": 2,
  "starter_credits": {
    "upgrade": {
      "plan_id": "developer",
      "primary": {
        "path": "/go/free-trial?utm_source=http-402&utm_medium=product&utm_campaign=free-tier-upgrade&utm_content=developer&utm_term=surface",
        "label": "Start a free trial"
      },
      "trigger": "surface",
      "secondary": {
        "path": "/go/pricing?utm_source=http-402&utm_medium=product&utm_campaign=free-tier-upgrade&utm_content=developer&utm_term=surface",
        "label": "See plans from EUR 49/month"
      }
    },
    "credit_cost": 5,
    "eligibility": "authenticated_connector_only",
    "positioning": "30,000 free live data credits every calendar month are for authenticated connectors only.",
    "upgrade_path": "When the monthly free allowance is exhausted or rate limited, start a free trial at /go/free-trial, compare plans at /go/pricing, or use signed x402 for direct public HTTP. For Enterprise terms, contact Blocksize sales about an authenticated account plan.",
    "identity_headers": [],
    "allowance_credits": 30000,
    "direct_public_http": "This request requires the signed x402 payment shown above.",
    "available_on_this_surface": false,
    "unverified_http_identity_enabled": false
  },
  "purchase_handoff": {
    "steps": [
      "Decode or read this x402 v2 challenge.",
      "Select exactly one requirement from accepts for a supported wallet network.",
      "Use an official x402 client to sign that exact requirement.",
      "Retry the same method and URL with the resulting PAYMENT-SIGNATURE header."
    ],
    "protocol": "x402 v2",
    "recovery": {
      "safe_retry": "Retry only the same method, URL, and request body represented by the signed challenge.",
      "unsupported_network": "Select another advertised requirement from accepts.",
      "invalid_or_expired_signature": "Fetch a fresh challenge and rebuild the payment; do not edit or reuse a bound signature."
    },
    "retry_url": "https://mcp.blocksize.info/v1/metal/XAUUSD",
    "quickstart": "https://mcp.blocksize.info/quickstart/first-price",
    "preview_url": "https://mcp.blocksize.info/v1/samples/market-data?service=metal&symbol=XAUUSD",
    "agent_manual": "https://mcp.blocksize.info/pdf/Blocksize_Agent_Manual.pdf",
    "retry_method": "GET",
    "wallet_safety": "Sign locally with a dedicated low-balance wallet and enforce a USDC spend cap. Blocksize never needs the buyer private key.",
    "buyer_examples": {
      "base_python": "https://github.com/jf-cmyk/agentic-payments/blob/main/examples/x402/buy_with_base.py",
      "solana_python": "https://github.com/jf-cmyk/agentic-payments/blob/main/scripts/run_funded_x402_canary.py",
      "base_typescript": "https://github.com/jf-cmyk/agentic-payments/blob/main/examples/x402/typescript/buy-with-base.ts"
    },
    "payment_header": "PAYMENT-SIGNATURE",
    "challenge_header": "PAYMENT-REQUIRED"
  },
  "legacy_requirements": [
    {
      "asset": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp/EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
      },
      "payTo": "9qCyPu7sLjnwgcbHYY76eqvtjsrdDxis9nn1sjD8CyJo",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "mimeType": "application/json",
      "resource": "9qCyPu7sLjnwgcbHYY76eqvtjsrdDxis9nn1sjD8CyJo",
      "description": "Blocksize Capital institutional market data",
      "maxAmountRequired": "5000",
      "maxTimeoutSeconds": 30
    },
    {
      "asset": "eip155:8453/0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe",
      "description": "Blocksize Capital institutional market data",
      "maxAmountRequired": "5000",
      "maxTimeoutSeconds": 60
    }
  ]
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

5000units

on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 9qCyPu…8CyJo
Token contract: EPjFWd…TDt1v
Payment window: 30 seconds
Returns: application/json

0.005USDC≈ $0.005 USD

on Base · exact scheme

Pay 0.005 USDC on Base to 0x52C7…70aDe. The signed payment is good for 1 minute.

Paid to: 0x52C7…70aDe
USD Coin contract: 0x8335…02913
Payment window: 1 minute
As published: 5000 smallest units
Returns: application/json

The catalog’s raw entry

[
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F",
      "resource": "https://mcp.blocksize.info/v1/metal/XAUUSD"
    },
    "payTo": "9qCyPu7sLjnwgcbHYY76eqvtjsrdDxis9nn1sjD8CyJo",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "mimeType": "application/json",
    "resource": "https://mcp.blocksize.info/v1/metal/XAUUSD",
    "description": "",
    "maxAmountRequired": "5000",
    "maxTimeoutSeconds": 30
  },
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "resource": "https://mcp.blocksize.info/v1/metal/XAUUSD"
    },
    "payTo": "0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://mcp.blocksize.info/v1/metal/XAUUSD",
    "description": "",
    "maxAmountRequired": "5000",
    "maxTimeoutSeconds": 60
  }
]

Provenance

Seen in the source catalog: 2026-10-08 05:34Z
Last indexed by Roundhouse: 2026-10-26 03:46Z
Last enriched (probe, favicon, geo): 2026-10-02 11:45Z
x402 version: 1
Max timeout: 60s
Liveness probe: HTTP 402

Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md

Show the prompt

Using Roundhouse, look up the x402 service mcp.blocksize.info and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=mcp.blocksize.info'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://mcp.blocksize.info/v1/metal/XAUUSD, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.