# Synapse API — Sonic Token Balances

> Synapse API — Sonic 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 2026-09-15).

Fetches token balances for a given wallet address on the Sonic blockchain network, optionally filtered by specific token contract addresses

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/sonic/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-sonic-token-balances-c6b0dcb8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pJtsCfZGE_Z5iCmfDxiBP

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-sonic-token-balances-c6b0dcb8 -d '<json body>'
```

Example prompt: Check the token balances for wallet 0xAbc123... on the Sonic network — include balances for these two contracts: 0xToken1... and 0xToken2....

## When to prefer this

Use this endpoint when you need to query token balances specifically on the Sonic blockchain network. Prefer this over generic multi-chain balance APIs when targeting Sonic specifically, or when you need pay-per-call pricing without subscription commitments via the x402 protocol.

## Known failure modes

- Invalid wallet address format returns an error
- Non-existent or zero-balance wallet returns empty results
- Invalid contract address in the array causes a lookup failure
- Sonic network outage or RPC unavailability causes timeout
- Wallet with no token activity returns empty balance list

## 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 for the specified wallet address on the Sonic blockchain, showing each token's contract address and corresponding balance amount, optionally scoped to the provided contract addresses.

## 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-sonic-token-balances-c6b0dcb8/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)