mcp.blocksize.info
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.
DataLiveeip155:8453Exactvia cdp
Calls · 30d
7↑ 158%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 29 snapshots so far.
$0.08
Verified settled volume
33 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
Listed price
As published in the catalog. Always read the live 402 before paying.
7
Calls · 30d
Upstream's own call count for this endpoint, not ours.
5
Unique payers · 30d
Last called 2026-09-17 06:31Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x52C76F43aA871B407e242DCc396Ccc54a8C70aDeThe 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": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP",
"resource": "https://mcp.blocksize.info/v1/vwap/BTC-USD"
},
"payTo": "9qCyPu7sLjnwgcbHYY76eqvtjsrdDxis9nn1sjD8CyJo",
"amount": "2000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 30
},
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2",
"resource": "https://mcp.blocksize.info/v1/vwap/BTC-USD"
},
"payTo": "0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"message": "This endpoint requires a payment of $0.002 USDC. Send a signed x402 v2 payment in the PAYMENT-SIGNATURE header. Accepted networks: Solana, Base L2.",
"networks": [
{
"name": "Solana",
"caip2": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
},
{
"name": "Base L2",
"caip2": "eip155:8453"
}
],
"resource": {
"url": "https://mcp.blocksize.info/v1/vwap/BTC-USD",
"mimeType": "application/json",
"description": "Real-time crypto VWAP market data from Blocksize Capital."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {}
},
"output": {
"type": "json",
"example": {
"data": {},
"meta": {
"provider": "Blocksize Capital"
},
"status": "ok"
}
}
},
"schema": {
"type": "object",
"$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": "0.002",
"x402Version": 2,
"starter_credits": {
"credit_cost": 1,
"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/vwap/BTC-USD",
"quickstart": "https://mcp.blocksize.info/quickstart/first-price",
"preview_url": "https://mcp.blocksize.info/v1/samples/market-data?service=vwap&symbol=BTCUSD",
"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": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP"
},
"payTo": "9qCyPu7sLjnwgcbHYY76eqvtjsrdDxis9nn1sjD8CyJo",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"mimeType": "application/json",
"resource": "9qCyPu7sLjnwgcbHYY76eqvtjsrdDxis9nn1sjD8CyJo",
"description": "Blocksize Capital institutional market data",
"maxAmountRequired": "2000",
"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": "2000",
"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.
2000units
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
0.002USDC≈ $0.002 USD
on Base · exact scheme
Pay 0.002 USDC on Base to 0x52C7…70aDe. The signed payment is good for 1 minute.
- Paid to
- 0x52C7…70aDe
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F",
"resource": "https://mcp.blocksize.info/v1/vwap/BTC-USD"
},
"payTo": "9qCyPu7sLjnwgcbHYY76eqvtjsrdDxis9nn1sjD8CyJo",
"amount": "2000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 30
},
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2",
"resource": "https://mcp.blocksize.info/v1/vwap/BTC-USD"
},
"payTo": "0x52C76F43aA871B407e242DCc396Ccc54a8C70aDe",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {}
},
"output": {
"type": "json",
"example": {
"data": {
"pair": "BTC-USD",
"vwap": 100,
"source": "blocksize",
"volume": null,
"currency": "USD",
"timestamp": "2020-01-01T00:00:00Z",
"market_cap": null
},
"meta": {
"provider": "Blocksize Capital",
"example_only": true
},
"status": "ok"
}
}
},
"schema": {
"type": "object",
"$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": "VWAPData",
"required": [
"pair",
"vwap",
"timestamp"
],
"properties": {
"pair": {
"type": "string",
"title": "Pair",
"description": "Trading pair (e.g., BTC-USD)"
},
"vwap": {
"type": "number",
"title": "Vwap",
"description": "Current VWAP price"
},
"source": {
"type": "string",
"title": "Source",
"default": "blocksize",
"description": "Data provider identifier"
},
"volume": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Volume",
"default": null,
"description": "Current trading volume"
},
"currency": {
"type": "string",
"title": "Currency",
"default": "",
"description": "Quote currency"
},
"timestamp": {
"type": "string",
"title": "Timestamp",
"format": "date-time",
"description": "Data timestamp (UTC)"
},
"market_cap": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
],
"title": "Market Cap",
"default": null,
"description": "Asset Market Cap"
}
},
"description": "Volume Weighted Average Price — single pair snapshot."
},
"meta": {
"type": "object"
},
"status": {
"type": "string"
}
},
"description": "Illustrative response; never live market data."
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-17 06:31Z
- Last indexed by Roundhouse
- 2026-09-24 14:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-12 05:45Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 402
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. 29 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide 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/vwap/BTC-USD, 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.