# Synapse API — Abstract RPC Endpoint

> Synapse API — Abstract 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 2026-09-15).

Executes JSON-RPC method calls against abstract blockchain networks, enabling cross-chain interactions across 57+ supported networks via pay-per-call.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/abstract/rpc
- 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-abstract-rpc-endpoint-7bd10b1e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J6dCNh5ezIbnXHmFNf9kR

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-abstract-rpc-endpoint-7bd10b1e -d '<json body>'
```

Example prompt: Send a JSON-RPC call to the abstract blockchain network using the method 'eth_getBalance' with params ['0xYourAddressHere', 'latest'] — I need to check the on-chain balance for that address.

## When to prefer this

Choose this endpoint when you need to make arbitrary JSON-RPC calls to abstract blockchain networks without running your own node, especially when you want pay-per-call pricing via x402 and access to 57+ chains through a single unified interface. It is best suited for agents that need flexible, low-overhead blockchain interaction without committing to a dedicated RPC provider subscription.

## Known failure modes

- Invalid or unsupported RPC method name returns a JSON-RPC error with code -32601
- Malformed params array causes a parse error response with code -32700
- Network or node unavailability returns a 5xx HTTP error or JSON-RPC internal error code -32603
- Payment failure due to insufficient USDC balance returns a 402 Payment Required before execution
- Unsupported chain or network identifier returns an error indicating the network is not available

## 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 the JSON-RPC response object from the target blockchain network, including the result field containing the queried on-chain data, transaction receipt, or contract call output. Error responses include a structured JSON-RPC error object with code and message fields.

## 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-abstract-rpc-endpoint-7bd10b1e/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)