EVM ETH and USDC Balance Snapshot

Preview request

The preview path is rate-limited and does not charge. It executes the live source and returns the paid response shape while withholding decision-ready values. Production requests use the same parameters and return a standard x402 challenge when no payment signature is present.

curl --request GET \
  "https://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/wallet_portfolio?preview=true&address=0xd8da6bf26964af9d7eed9e03e53415d37aa96045&chain=ethereum"

Input contract

Example deliverable

This is the documented response shape, not a promise that live values will match the example. The paid request returns current or declared-source results using the same contract.

{
  "success": true,
  "source": [
    "ethereum public JSON-RPC",
    "CoinGecko simple price API"
  ],
  "fetched_at": "2026-08-07T07:32:32.441Z",
  "note": "Limited portfolio covers native ETH and official USDC only; it does not enumerate every token or NFT.",
  "wallet": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
  "network": "ethereum",
  "assets": [
    {
      "symbol": "ETH",
      "balance": 6.633333069544915,
      "usd_price": 1903.98,
      "estimated_usd_value": 12629.733497752128
    },
    {
      "symbol": "USDC",
      "contract": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "balance": 37.192124,
      "usd_price": 1,
      "estimated_usd_value": 37.192124
    }
  ],
  "estimated_total_usd": 12666.925621752127,
  "marketplace_metadata": {
    "data_mode": "live_source",
    "billable": true,
    "availability": "operational",
    "source": "public EVM JSON-RPC and CoinGecko"
  }
}

Why this offer exists

A narrow live ETH and official USDC balance snapshot with an ETH USD estimate.

Buyer searches: wallet balance lookup, ETH balance, USDC balance, EVM wallet snapshot.

Why pay: Receive the complete current result without maintaining the upstream integration.

Launch price: 0.003 USDC per complete paid result. The live contract proof verifies source, freshness, inputs, and response shape before a wallet is asked to pay.

Purchase decision

Buy when: the active task needs this product's structured result, its declared source and freshness are sufficient, and 0.003 USDC is within the buyer's authorized per-request limit.

Skip when: a cached result is sufficient, the source or fields do not satisfy the task, or the buyer has not authorized payment. Do not bypass wallet, budget, or user-approval policy.

Guaranteed response metadata

Every successful product response identifies how the result was produced. Product-specific output fields are documented in the paid OpenAPI contract. The preview proves the live source and field types without returning the paid values.

{
  "marketplace_metadata": {
    "data_mode": "live_source",
    "billable": true,
    "availability": "operational",
    "source": "public EVM JSON-RPC and CoinGecko"
  }
}

Agent payment flow

Fast path: install the public MCP package, configure a dedicated low-balance Base buyer wallet and a maximum per-request spend, then call this tool with auto_pay: true. The client handles the challenge, local signature, settlement, and retry in one tool call.

npx -y dopaminedesk-ai-data-marketplace-mcp

X402_AUTO_PAY=true
X402_EVM_PRIVATE_KEY=<dedicated buyer wallet key>
X402_MAX_PAYMENT_USDC=0.25

tool input: { "auto_pay": true }

Manual path: request the product, read the base64 PAYMENT-REQUIRED challenge, sign with any compatible x402 v2 client, and retry with PAYMENT-SIGNATURE. A successful response includes PAYMENT-RESPONSE.