# Synapse API — MegaETH Token Balances

> Synapse API — MegaETH 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 ERC-20 token balances for a given wallet address on the MegaETH blockchain network, optionally filtered by specific contract addresses.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/megaeth/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-megaeth-token-balances-8224c296
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SzvVYD0NChMdBgbWQQRs5

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-megaeth-token-balances-8224c296 -d '<json body>'
```

Example prompt: What are all the ERC-20 token balances for the MegaETH wallet address 0xAbC123...? Also check specifically for the tokens at contract addresses 0xToken1... and 0xToken2....

## When to prefer this

Use this endpoint when you specifically need ERC-20 token balances on the MegaETH network. It supports filtering by contract address, making it efficient for targeted balance lookups rather than full wallet scans. Prefer this over generic multi-chain balance APIs when MegaETH is the target network, and it is cost-effective at $0.01 per call via x402 micropayments.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty result
- Non-existent contract addresses return zero balances or an error
- MegaETH network unavailability causes timeout or 5xx error
- Missing required 'owner' field results in a 400 bad request
- Payment failure via x402 blocks the request before execution

## 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 ERC-20 token balances associated with the specified wallet address on the MegaETH network, including token contract addresses and their respective balance amounts. If specific contract addresses are provided, results are filtered to those tokens only.

## 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-megaeth-token-balances-8224c296/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)