# Synapse API — Unichain RPC Endpoint

> Synapse API — Unichain RPC Endpoint 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 2026-10-12).

Provides a pay-per-call JSON-RPC gateway to the Unichain blockchain network, enabling standard Ethereum-compatible RPC method calls over HTTP.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/unichain/rpc?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-unichain-rpc-endpoint-056b1e92
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VpUoqCK1O8ZwrsVYT3yc3

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-unichain-rpc-endpoint-056b1e92 -d '<json body>'
```

Example prompt: Call eth_getBalance on Unichain for wallet address 0xAbC...123 at the latest block so I can see how much ETH is in that account.

## When to prefer this

Choose this endpoint when you specifically need RPC access to the Unichain network (not Ethereum mainnet or other L2s) and want pay-per-call pricing via x402 without committing to a subscription RPC provider. Ideal for low-volume or sporadic Unichain interactions from an AI agent that already handles x402 micropayments.

## Known failure modes

- Invalid RPC method name returns JSON-RPC error -32601 (Method not found)
- Malformed params array causes -32602 (Invalid params)
- Network congestion or node unavailability may cause timeouts
- Payment failure (x402) blocks request if USDC balance is insufficient
- Calling a non-existent contract address returns empty result or revert

## 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 standard JSON-RPC response object containing the result field with blockchain data (e.g. balance in wei, block object, transaction receipt, contract return value) or an error object with code and message if the call fails.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "method": {
   "type": "string"
  },
  "params": {
   "type": "array",
   "items": {}
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-unichain-rpc-endpoint-056b1e92/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)