# Synapse API — Degen Token Balances

> Synapse API — Degen 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 owner address across specified ERC-20 contract addresses on supported blockchain networks

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/degen/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-degen-token-balances-bf0f6bcc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PT0BTWaG2LKpI1hQ0Qei0

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-degen-token-balances-bf0f6bcc -d '<json body>'
```

Example prompt: What are the token balances for wallet 0xAbC123...def for these contracts: 0xToken1... and 0xToken2...?

## When to prefer this

Choose this endpoint when you need to quickly look up ERC-20 token balances for a specific wallet address across one or more token contracts on supported blockchain networks. It is well-suited for DeFi portfolio checks, airdrop verification, whale wallet monitoring, or any scenario requiring fast per-call token balance data without setting up a full blockchain node. Prefer it when paying per-call via x402 is acceptable and you need results across 57+ supported chains.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty result
- Non-existent or unsupported contract address may return zero balance or an error
- Network or RPC outage for the target blockchain chain may cause lookup failure
- Payment failure via x402 results in a 402 response and no data returned
- Requesting balances on an unsupported blockchain network may return 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 token balance data for the specified owner wallet across the listed contract addresses, typically including each token's balance amount per contract, enabling portfolio visibility or audit of specific token holdings.

## 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-degen-token-balances-bf0f6bcc/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)