# Synapse API — Ronin Token Balances

> Synapse API — Ronin 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).

Fetches token balances for a given owner address across specified ERC-20/token contract addresses on the Ronin blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/ronin/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-ronin-token-balances-a6a32b68
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8QGz8VoOuU7RCrzhF306Y

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-ronin-token-balances-a6a32b68 -d '<json body>'
```

Example prompt: Check the token balances for Ronin wallet address 0xABC123... across these token contracts: 0xContract1 and 0xContract2.

## When to prefer this

Use this endpoint when you specifically need token balance data on the Ronin blockchain (Sky Mavis / Axie Infinity ecosystem). Prefer this over generic blockchain balance APIs when your use case involves Ronin-native tokens like RON, SLP, AXS, or USDC on Ronin.

## Known failure modes

- Invalid or malformed owner wallet address returns an error
- Non-existent or incorrect contract address returns zero balance or error
- Ronin RPC node unavailability causes timeout
- Missing required 'owner' field causes 400 bad request
- Rate limiting or payment failure via x402 blocks the call

## 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 owner address on the Ronin blockchain, keyed by the provided contract addresses, including token amounts and possibly metadata such as token name or decimals.

## 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-ronin-token-balances-a6a32b68/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)