# Synapse API — Kaia Token Balances

> Synapse API — Kaia Token Balances is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Retrieves token balances for a given wallet address on the Kaia blockchain, optionally filtered by specific contract addresses

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/kaia/token/balances
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-kaia-token-balances-821ed4f3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zObWdAY3JmmaWOMtE5zlA

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-api-kaia-token-balances-821ed4f3 -d '<json body>'
```

Example prompt: What token balances does the Kaia wallet 0xAbC...123 hold? Check specifically for these contract addresses: 0xToken1... and 0xToken2...

## When to prefer this

Choose this endpoint when you specifically need token balance data on the Kaia blockchain (formerly Klaytn). It supports multi-token lookups in a single call via the contractAddresses array, making it efficient for portfolio snapshots. Prefer this over generic EVM balance APIs when the target network is Kaia and you need ERC-20/KIP-7 token-level granularity rather than just native coin balances.

## Known failure modes

- Invalid or malformed owner wallet address — returns error or empty result
- Contract address array contains invalid addresses — partial or no results returned
- Kaia network node unavailable — service timeout or 503 error
- Owner address has no token holdings — returns empty balance list
- Upstream RPC rate-limited — may return 429 or degraded response

## How this service works

High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.

## Output

Returns a list of token balances associated with the specified owner wallet on the Kaia blockchain. Each entry typically includes the contract address, token symbol or name, and the balance amount. If specific contract addresses are provided, only those tokens' balances are returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "owner": {
   "type": "string"
  },
  "contractAddresses": {
   "type": "array",
   "items": {
    "type": "string"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-kaia-token-balances-821ed4f3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from synapse-api-brown.vercel.app](https://www.zero.xyz/host/synapse-api-brown.vercel.app/llms.txt)