# Synapse Wallet Balance Lookup

> Synapse Wallet Balance Lookup is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).

Returns the onchain token balance for a given wallet address, optionally filtered by a specific token (e.g. USDC).

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/wallet-balance?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-wallet-balance-lookup-933d5111
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MhJMC-1MUT-AYKMVMRcgM

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 synapse-wallet-balance-lookup-933d5111
```

Example prompt: What's the USDC balance of the wallet address 0xAbc123...def456 right now?

## When to prefer this

Use this endpoint when you need a quick, no-account-required onchain balance lookup for any EVM wallet address, especially on Base. It is ideal for AI agents that need to verify wallet balances before executing transactions or monitoring DeFi positions, and is priced at $0.005 USDC per call via x402 — no API keys needed.

## Known failure modes

- Invalid or malformed wallet address returns an error response
- Unsupported token symbol may return zero balance or an error
- Payment failure (insufficient USDC for x402 fee) results in 402 response before data is returned
- Network or RPC issues may cause transient failures or delayed responses
- Missing required 'address' query parameter returns a validation error

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

A JSON object containing the queried wallet address, the token symbol (e.g. 'usdc'), and the current onchain balance as a numeric value. Example: {token: 'usdc', address: '0x...', balance: 100}.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "token": {
       "type": "string"
      },
      "address": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "token": "usdc",
  "address": "0x...",
  "balance": 100
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-wallet-balance-lookup-933d5111/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)