mcp.blocksize.info

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

Real-time FX market data from Blocksize Capital.

DataLiveeip155:8453Exactvia cdp

https://mcp.blocksize.info/v1/fx/EURUSD

Calls · 30d

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 10 snapshots so far.

$0.08

Verified settled volume

33 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

Last called 2026-09-15 07:23Z

—

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/fx/EURUSD"
      },
      "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/fx/EURUSD"
      },
      "payTo": "0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    }
  ],
  "message": "This endpoint requires a payment of $0.005 USDC. Send a signed x402 v2 payment in the PAYMENT-SIGNATURE header. Accepted networks: Solana, Base L2.",
  "networks": [
    {
      "name": "Solana",
      "caip2": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
    },
    {
      "name": "Base L2",
      "caip2": "eip155:8453"
    }
  ],
  "resource": {
    "url": "https://mcp.blocksize.info/v1/fx/EURUSD",
    "mimeType": "application/json",
    "description": "Real-time FX market data from Blocksize Capital."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "data": {},
            "meta": {
              "provider": "Blocksize Capital"
            },
            "status": "ok"
          }
        }
      },
      "schema": {
        "type": "object",
        "$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": {
                "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"
              }
            }
          }
        }
      }
    }
  },
  "price_usdc": "0.005",
  "x402Version": 2,
  "starter_credits": {
    "credit_cost": 2,
    "eligibility": "authenticated_connector_only",
    "positioning": "Up to 50 live data credits are for authenticated connectors only.",
    "upgrade_path": "Contact sales for sustained access through an authenticated account plan.",
    "identity_headers": [],
    "allowance_credits": 50,
    "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/fx/EURUSD",
    "quickstart": "https://mcp.blocksize.info/quickstart/first-price",
    "preview_url": "https://mcp.blocksize.info/v1/samples/market-data?service=fx&symbol=EURUSD",
    "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

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

The catalog’s raw entry

[
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F",
      "resource": "https://mcp.blocksize.info/v1/fx/EURUSD"
    },
    "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/fx/EURUSD"
    },
    "payTo": "0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {}
      },
      "output": {
        "type": "json",
        "example": {
          "data": {},
          "meta": {
            "provider": "Blocksize Capital"
          },
          "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": {
              "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"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog: 2026-09-15 07:23Z
Last indexed by Roundhouse: 2026-09-25 17:10Z
Last enriched (probe, favicon, geo): 2026-09-15 14:15Z
x402 version: 2
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. 10 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/fx/EURUSD, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

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