# x402.valkyry.fr Wallet Balance

> x402.valkyry.fr Wallet Balance is a paid API for AI agents from x402.valkyry.fr, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).

Returns native token and ERC-20 token balances for a given EVM wallet address on a specified network

## Facts

- Endpoint: POST https://x402.valkyry.fr/wallet-balance?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 2
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-valkyry-fr-wallet-balance-0b78495d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sVx2JoVnIkSG4U4uH_ap1

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-valkyry-fr-wallet-balance-0b78495d -d '<json body>'
```

Example prompt: What's the current ETH balance and USDC token balance for wallet 0xAbC123...def on the Base network?

## When to prefer this

Use this endpoint when you need to check native or ERC-20 token balances for an EVM wallet address across major networks (Ethereum, Base, Arbitrum, Optimism, Polygon) and want a pay-per-call micro-API with no subscription required. Prefer over self-hosted RPC calls when you lack a node provider, or when building lightweight agent workflows.

## Known failure modes

- Invalid or malformed EVM address returns an error
- Unsupported network name causes a bad request response
- Invalid ERC-20 token contract address may return empty or error
- Payment failure via x402 protocol results in 402 response before processing
- Network RPC unavailability may cause timeout or error

## How this service works

On-chain native + ERC-20 token balances for any EVM address across Ethereum, Base, Arbitrum, Optimism and Polygon. For wallet-tracking and DeFi agents.

## Output

A JSON object with a 'native' field containing the native token symbol and formatted balance (e.g. ETH: 1.23), a 'tokens' array with any requested ERC-20 token balances, and the network identifier (e.g. eip155:1).

## Example request

```json
{
 "tokens": [
  "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
 ],
 "address": "0x1234567890123456789012345678901234567890",
 "network": "ethereum"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "tokens": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "description": "Optional ERC-20 token addresses to include"
  },
  "address": {
   "type": "string",
   "description": "EVM address (0x…)"
  },
  "network": {
   "type": "string",
   "description": "ethereum | base | arbitrum | optimism | polygon (default ethereum)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "native": {
   "symbol": "ETH",
   "formatted": "1.23"
  },
  "tokens": [],
  "network": "eip155:1"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-valkyry-fr-wallet-balance-0b78495d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.valkyry.fr](https://www.zero.xyz/host/x402.valkyry.fr/llms.txt)