# Synapse API — Worldchain Token Balances

> Synapse API — Worldchain 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 ERC-20 token balances for a given wallet address on the Worldchain blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/worldchain/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-worldchain-token-balances-78397f74
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1cFvjWYJaU39ssuFgBocL

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-worldchain-token-balances-78397f74 -d '<json body>'
```

Example prompt: What are the token balances for wallet 0xAbC123... on Worldchain for these token contracts: 0xToken1, 0xToken2, and 0xToken3?

## When to prefer this

Choose this endpoint when you need to retrieve ERC-20 token balances specifically on the Worldchain network, especially for multiple token contracts at once. It is preferable when you already have a list of contract addresses and a target wallet, and need a fast, pay-per-call lookup without setting up your own RPC node. Best suited for agents or apps integrating Worldchain portfolio data without managing blockchain infrastructure.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty result
- Non-existent or invalid contract addresses may return zero balances or an error
- Network unavailability or Worldchain RPC issues may cause timeouts
- Payment failure via x402 results in 402 response and no data returned
- Empty contractAddresses array may return no results or an error

## 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 Worldchain, keyed by ERC-20 contract address, including balance amounts (typically as raw BigInt or formatted values 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-worldchain-token-balances-78397f74/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)