Blocksize Market Data

Name: Blocksize Market Data
Author: blocksize

Discover Blocksize market data for AI agents: crypto, supported equities, FX, and metals.

CommunityOnlineNo sign-inGlobalFreeRead-only

What it can do

Search Pairs: Discover supported crypto, equity, FX, and metal symbols before using the paid HTTP API. Returns up to 50 catalog matches with asset class, available services, and pricing tier; it is fr
List Instruments: List the supported instruments for one Blocksize service. This is free, read-only catalog metadata; it does not fetch live prices, create accounts, or start x402 payment.
Get Pricing Info: Inspect current direct x402 per-call prices, authenticated connector starter-credit costs, supported USDC settlement networks, and the account-plan contact path. This is free read-on

What data it sees

Do you need an account

No: the server works without sign-in

Discover Blocksize market data for AI agents: crypto, supported equities, FX, and metals. Search instruments, inspect pricing and product coverage, and build exact HTTP requests for prices, VWAP, bid/ask, market briefs, macro snapshots, pre-trade checks, and provenance receipts.

The eight public MCP tools are free and read-only: they provide catalog metadata, documentation, and request builders, not live prices. Paid data is delivered through the x402-protected HTTP API with USDC settlement on Solana or Base. Check service-specific coverage and freshness before purchasing; catalog inclusion is not a live-delivery guarantee.

Start here: https://mcp.blocksize.info/quickstart/first-price API reference: https://mcp.blocksize.info/openapi.json Coverage and readiness: https://mcp.blocksize.info/v1/coverage Authentication and eligible connector credits: https://mcp.blocksize.info/auth.md

Starter credits require an eligible authenticated connector identity; anonymous public MCP and HTTP requests cannot spend those credits. Price receipts provide provenance, not cryptographically signed attestations.

How to connect

How to connect Blocksize Market Data to Claude

The server address to paste into Claude settings:

https://agentic-payments--blocksize.run.tools

Open Claude (claude.ai or the desktop app).
Go to Settings → Connectors.
Click Add custom connector.
Paste the server address copied below into Remote MCP server URL and click Add.
In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect Blocksize Market Data to ChatGPT

The server address to paste into ChatGPT settings:

https://agentic-payments--blocksize.run.tools

Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
Open Settings → Connectors and click Create.
Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect Blocksize Market Data to Cursor

The server address to paste into Cursor settings:

https://agentic-payments--blocksize.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (8)

Raw names from tools/list. Only developers need these.

search_pairs	Discover supported crypto, equity, FX, and metal symbols before using the paid HTTP API. Returns up to 50 catalog matches with asset class, available services, and pricing tier; it is free, read-only, and never returns live prices or starts payment.
list_instruments	List the supported instruments for one Blocksize service. This is free, read-only catalog metadata; it does not fetch live prices, create accounts, or start x402 payment.
get_pricing_info	Inspect current direct x402 per-call prices, authenticated connector starter-credit costs, supported USDC settlement networks, and the account-plan contact path. This is free read-only metadata; it does not initiate payment.
get_product_catalog	Inspect Blocksize raw data, supported equity ticker bid/ask, and premium agent-native workflow products, including starter-credit positioning, credit costs, suggested paid prices, endpoint templates, and upgrade path. This is free and read-only.
get_workflow_endpoint	Build the exact paid HTTP endpoint, method, starter-credit cost, and example body for a premium Blocksize workflow. This is free and read-only; it does not fetch live data, charge credits, or start x402.
get_market_data_endpoint	Build the exact x402-protected HTTP URL for one live market-data request. Returns method, URL, service notes, pricing docs, and next steps; it is read-only and does not fetch prices, charge a wallet, or submit payment.
search	Search Blocksize documentation and catalog metadata by keyword. This free read-only search returns document and instrument ids for fetch; it does not return live prices or start payment.
fetch	Fetch one document or instrument guide returned by search. This is free, read-only content retrieval with no account, credential, payment, or live-price side effects.