MCP Tool · x402 · early usage

Deterministic, no-LLM portfolio performance attribution

by www.u2a.com.au · discovered, not yet claimed by its owner · updated 2026-10-12

30d calls8

30d payers3

MethodPOST

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

Deterministic, no-LLM portfolio performance attribution. Send position start/end values, dated cash flows and a period; receive Modified Dietz and money-weighted XIRR returns against BTC, ETH, stETH or any benchmark you supply prices for, plus per-position contribution and alpha. Every input and output carries a caller-asserted data-quality status with reasons. Each result comes with a calculation hash, optionally EIP-191 signed, for audit and verification.

Tags: finance · portfolio-attribution · performance-attribution · crypto-portfolio · alpha · bazaar · u2a

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-12

Input example from Bazaar metadata

{
  "benchmarks": [
    {
      "end_price": 112000,
      "id": "BTC",
      "start_price": 94000
    },
    {
      "end_price": 3900,
      "id": "stETH",
      "income_return": {
        "status": "estimated",
        "value": 0.022
      },
      "start_price": 3300
    }
  ],
  "currency": "USD",
  "period": {
    "end": "2026-09-30",
    "start": "2026-01-01"
  },
  "positions": [
    {
      "end_value": {
        "source": "coingecko close 2026-09-30",
        "status": "verified",
        "value": 12600
      },
      "flows": [
        {
          "amount": 2000,
          "date": "2026-04-01",
          "source": "tx 0x9c1e4b7a2d5f8e3c6b0a9d2f5e8c1b4a7d0e3f6c9b2a5d8e1f4c7b0a3d6e9f2c",
          "status": "verified"
        }
      ],
      "id": "ETH",
      "start_value": {
        "source": "wallet 0xabc0000000000000000000000000000000000123, block 21500000",
        "status": "verified",
        "value": 10000
      }
    },
    {
      "end_value": 4200,
      "flows": [
        {
          "amount": -1000,
          "date": "2026-06-15",
          "source": "article",
          "status": "estimated"
        }
      ],
      "id": "SOL",
      "start_value": 5000
    }
  ]
}

Output example

{
  "jsonrpc": "2.0",
  "result": {
    "benchmarks": [
      {
        "data_status": "estimated",
        "data_status_inputs": [
          "portfolio.data_status_inputs"
        ],
        "excess_return": -0.14131643,
        "id": "BTC",
        "return": 0.19148936,
        "top_alpha_detractors": [
          {
            "active_contribution": -0.09853659,
            "id": "ETH"
          }
        ]
      }
    ],
    "portfolio": {
      "data_status": "estimated",
      "data_status_inputs": [
        "positions[1].flows[0].amount"
      ],
      "data_status_reason": "Weakest input: SOL flow on 2026-06-15 (positions[1].flows[0].amount) is \"estimated\" (source: article).",
      "money_weighted_return_period": 0.05018879,
      "pnl": 800,
      "return": 0.05017293
    },
    "positions": [
      {
        "active_contribution": {
          "BTC": -0.09853659
        },
        "contribution": 0.0376297,
        "data_status": "verified",
        "id": "ETH",
        "weight": 0.71109062
      }
    ],
    "provenance": {
      "attests": "calculation",
      "result_hash": "0x4a7d1e8b3c6f9a2d5e0b7c4f1a8d3e6b9c2f5a0d7e4b1c8f3a6d9e2b5c0f7a4d"
    },
    "reconciliation": {
      "portfolio_return": 0.05017293,
      "sum_of_contributions": 0.05017293
    }
  }
}

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/34859.json for the price and payment options.
Pay. Call GET https://www.u2a.com.au/api/mcp/portfolio-attribution. 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 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: $0.03 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 8 calls · 3 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.03	0x886e7a8d46E239A9d54F48da163B04bb002B14a0	600s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x886e7a8d46E239A9d54F48da163B04bb002B14a0",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "30000",
    "amountUsd": 0.03,
    "maxTimeoutSeconds": 600
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": {},
  "type": "string"
}

Examples

curl

curl "https://www.u2a.com.au/api/mcp/portfolio-attribution"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://www.u2a.com.au/api/mcp/portfolio-attribution");
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://www.u2a.com.au/api/mcp/portfolio-attribution")
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: www.u2a.com.au
Endpoint: https://www.u2a.com.au/api/mcp/portfolio-attribution
Machine-readable: /resources/34859.json