# Synapse API — World Chain RPC Endpoint

> Synapse API — World Chain 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 2026-10-15).

Provides a JSON-RPC gateway to the World Chain blockchain network, enabling read and write interactions with on-chain data.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/worldchain/rpc?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-world-chain-rpc-endpoint-ae75dc0d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hZKJHDoY6KJxxRnqDfPKY

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-world-chain-rpc-endpoint-ae75dc0d -d '<json body>'
```

Example prompt: Can you check the current ETH balance of wallet address 0xAbC123... on World Chain using the eth_getBalance RPC method?

## When to prefer this

Choose this endpoint when you need direct JSON-RPC access to the World Chain (Worldcoin L2) network specifically, paid per-call via x402/USDC micropayments, without needing to manage your own node infrastructure or API key subscriptions.

## Known failure modes

- Invalid RPC method name returns JSON-RPC error -32601 (method not found)
- Malformed params array returns -32602 (invalid params)
- Payment not included or insufficient USDC returns HTTP 402
- Rate limiting or node unavailability returns HTTP 503
- Transaction broadcast failure due to low gas or nonce mismatch returns execution 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 standard JSON-RPC response object containing the result field with blockchain data (balance, receipt, block info, contract return value, etc.) 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-world-chain-rpc-endpoint-ae75dc0d/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)