# Synapse API — Superseed RPC

> Synapse API — Superseed RPC 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 2026-10-16).

Proxies JSON-RPC calls to the Superseed blockchain network, enabling on-chain reads and writes via a pay-per-call HTTP endpoint.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/superseed/rpc?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-superseed-rpc-8f6dd22b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Jr2lndKN1yAYZwBnO09It

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-superseed-rpc-8f6dd22b -d '<json body>'
```

Example prompt: Call eth_getBalance on the Superseed blockchain for address 0xAbC123... using the Synapse RPC proxy — I need to know the current balance in wei.

## When to prefer this

Choose this endpoint when you need direct, low-latency JSON-RPC access to the Superseed blockchain specifically — particularly for on-chain reads (balances, block data, contract state) or broadcasting signed transactions. Prefer this over generic multi-chain RPC aggregators if Superseed is your target network and you want pay-per-call pricing without a subscription.

## Known failure modes

- Invalid RPC method name returns JSON-RPC error -32601 (method not found)
- Malformed params array causes -32602 (invalid params) error
- Superseed node unreachable returns HTTP 502 or timeout
- Payment not attached or insufficient causes HTTP 402 Payment Required
- Submitting transactions with invalid signatures returns execution reverted error
- Rate limiting or node congestion may cause delayed responses

## 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 with an 'id', 'jsonrpc' version field, and a 'result' containing the requested on-chain data (balance, block info, receipt, contract return value, etc.) or an 'error' object if the call failed.

## 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-superseed-rpc-8f6dd22b/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)