# Synapse API — Soneium RPC Endpoint

> Synapse API — Soneium 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 2026-10-10).

Provides JSON-RPC access to the Soneium blockchain network, enabling on-chain queries and transaction submission via pay-per-call x402 payments.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/soneium/rpc?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-soneium-rpc-endpoint-09d53bf2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jv6QK3v9hjXBGvs8vnXoU

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-soneium-rpc-endpoint-09d53bf2 -d '<json body>'
```

Example prompt: Can you check the current ETH balance of wallet address 0xAbC...123 on the Soneium network using eth_getBalance?

## When to prefer this

Choose this endpoint when you specifically need to interact with the Soneium blockchain (Sony's L2 network) via standard Ethereum JSON-RPC, especially if you want pay-per-call pricing via x402 without a subscription. Prefer this over general Ethereum RPC endpoints when targeting Soneium-specific smart contracts or the Soneium ecosystem.

## Known failure modes

- Invalid JSON-RPC method name returns error response
- Malformed params array causes parse error
- Payment failure (x402) blocks request
- Network downtime on Soneium causes timeout
- Unsupported RPC method returns method-not-found error
- Rate limiting if too many calls in quick succession

## 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 the requested on-chain data (balances, block info, transaction receipts, contract return values, etc.) or an error object 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-soneium-rpc-endpoint-09d53bf2/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)