# SilverbackDeFi Wallet Portfolio

> SilverbackDeFi Wallet Portfolio is a paid API for AI agents from x402.silverbackdefi.app, paid per call via x402, $0.02/call, status down (last checked 2026-09-15).

Returns a full ERC-20 token portfolio with USD values for any given wallet address on a specified chain

## Facts

- Endpoint: GET https://x402.silverbackdefi.app/api/v1/wallet-portfolio
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-silverbackdefi-app-4df8c1b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DfuNDG3IMe0yUAYetWZqf

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 x402-silverbackdefi-app-4df8c1b5
```

Example prompt: Pull up the full ERC-20 token portfolio with USD values for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Base (chain ID 8453).

## When to prefer this

Use this endpoint when you need a comprehensive, USD-valued snapshot of all ERC-20 tokens in a wallet, especially on Base chain. Prefer this over individual token balance lookups when you need a full portfolio view in one call.

## Known failure modes

- Invalid or malformed wallet address returns an error
- Unsupported chain ID returns an error or empty result
- Wallet with no ERC-20 holdings returns an empty portfolio
- Network timeout or provider unavailability causes a 5xx response
- Rate limiting or payment failure (x402) blocks the request

## How this service works

Fetch aggregated token holdings, balances, and USD valuation for a given wallet across supported chains.

## Output

A list of all ERC-20 tokens held by the specified wallet, including token names, symbols, balances, and their current USD values, aggregated into a complete portfolio view.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "address": {
   "type": "string",
   "description": "Wallet address (0x format)"
  },
  "chainId": {
   "type": "number",
   "description": "Chain ID (default: 8453 Base)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "tokens": [],
   "address": "0xD34...",
   "totalValueUsd": 1250.5
  },
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-silverbackdefi-app-4df8c1b5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.silverbackdefi.app](https://www.zero.xyz/host/x402.silverbackdefi.app/llms.txt)