# Synapse API — Ink Network Token Balance Lookup

> Synapse API — Ink Network Token Balance Lookup 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 2026-09-15).

Retrieves token balances for a given wallet address across specified ERC-20 contract addresses on the Ink blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/ink/token/balances
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-ink-network-token-balance-lookup-eaa2321f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f8_cMEQdeDNkNXFUFppfP

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-ink-network-token-balance-lookup-eaa2321f -d '<json body>'
```

Example prompt: Check the token balances for wallet 0xAbC123...def on the Ink network for these two contracts: 0xToken1... and 0xToken2... — tell me how much of each token they hold.

## When to prefer this

Choose this endpoint when you need token balance data specifically on the Ink blockchain network and want a pay-per-call model without API key subscription overhead. Best for agents that need ad-hoc, low-frequency wallet balance lookups on Ink rather than continuous indexing solutions.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty result
- Invalid contract address returns zero balance or error
- Ink network downtime or RPC failure causes timeout or 5xx error
- Payment not fulfilled (402) if x402 micropayment not included
- Empty contractAddresses array may return no results
- Rate limiting if called too frequently without payment

## 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 token balance data for the specified wallet address across the requested ERC-20 contract addresses on the Ink blockchain network, including balance amounts per contract.

## 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-ink-network-token-balance-lookup-eaa2321f/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)