# Aether Base Portfolio Lookup

> Aether Base Portfolio Lookup is a paid API for AI agents from aether-x402.vercel.app, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-12).

Fetches the token holdings and USD portfolio value for a Base network wallet address, optionally filtered to specific token contracts.

## Facts

- Endpoint: POST https://aether-x402.vercel.app/v1/base/portfolio?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aether-base-portfolio-lookup-e55d6d3c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_B_XkxK0890F6PkBDpFviK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability aether-base-portfolio-lookup-e55d6d3c -d '<json body>'
```

Example prompt: Can you pull up the full token portfolio for the Base wallet 0xAbc123...def456 and show me all the holdings with their USD values?

## When to prefer this

Use this endpoint when you need onchain portfolio data specifically for Base network wallets, paid micro-per-call via x402/USDC — ideal for AI agents that need to audit wallet value without managing a full RPC node or subscribing to a bulk data provider. Best when you want a simple holdings snapshot rather than deep historical or cross-chain data.

## Known failure modes

- Invalid or malformed wallet address returns a validation error
- Address with no Base activity returns empty holdings array
- Token contract addresses not on Base return empty or null entries
- Rate limiting or payment failure (x402) if USDC payment not attached
- Up to 20 token addresses per call; exceeding maxItems causes a 400 error
- Unverified or very new tokens may have missing price data and return null USD values

## How this service works

Pay-per-call Base onchain data, token risk verdicts and x402 payability audits over x402 (USDC on Base).

## Output

Returns a JSON object with a 'holdings' array where each item contains the token symbol, raw balance, and USD value, plus a 'totalUsd' field with the aggregate portfolio value across all held tokens.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "tokens": {
   "type": "array",
   "items": {
    "type": "string",
    "pattern": "^0x[0-9a-fA-F]{40}$"
   },
   "maxItems": 20
  },
  "address": {
   "type": "string",
   "pattern": "^0x[0-9a-fA-F]{40}$"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "holdings": [
   {
    "usd": 750.1,
    "symbol": "ETH",
    "balance": "0.3"
   }
  ],
  "totalUsd": 1234.56
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aether-base-portfolio-lookup-e55d6d3c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aether-x402.vercel.app](https://www.zero.xyz/host/aether-x402.vercel.app/llms.txt)