# Synapse API — Mantle Token Balances

> Synapse API — Mantle 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).

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

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/mantle/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-mantle-token-balances-eaa1a3db
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WD1iVaBmPLK1ThY7WZfnF

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-mantle-token-balances-eaa1a3db -d '<json body>'
```

Example prompt: What are all the token balances for wallet 0xAbC123...def on the Mantle network? Also check specifically for these two token contracts: 0xToken1... and 0xToken2....

## When to prefer this

Choose this endpoint when you specifically need token balance data on the Mantle (MNT) Layer 2 network. It supports multi-token lookup in a single call and allows filtering by specific ERC-20 contract addresses, making it ideal for portfolio checks and DeFi integrations on Mantle.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty result
- Non-existent contract addresses may return zero balances or an error
- Mantle node unavailability may cause timeout or 5xx errors
- Rate limiting or payment failure via x402 protocol could block the request

## 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 on the Mantle blockchain, including balances for each token held (or each specified contract address if provided). Typically includes token symbol, contract address, and balance amount per token.

## 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-mantle-token-balances-eaa1a3db/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)