# Synapse API — Base Network RPC Endpoint

> Synapse API — Base Network 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 2026-09-14).

Executes JSON-RPC method calls against the Base blockchain network, enabling on-chain data queries and transactions via pay-per-call micropayments.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/base/rpc
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-base-network-rpc-endpoint-d5f2089c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PU_ZEtB-kbi_kyLmUKm7-

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-base-network-rpc-endpoint-d5f2089c -d '<json body>'
```

Example prompt: Can you check the current ETH balance of wallet address 0xABC123... on the Base network using eth_getBalance with the latest block?

## When to prefer this

Choose this endpoint when you need direct, low-latency JSON-RPC access to the Base (Coinbase L2) network and want pay-per-call pricing without a subscription. Ideal for agents that need occasional on-chain lookups or one-off contract calls on Base without provisioning a dedicated RPC node or API key.

## Known failure modes

- Invalid RPC method name returns JSON-RPC error -32601 (method not found)
- Malformed params array returns error -32602 (invalid params)
- Payment failure (insufficient USDC) results in 402 Payment Required before execution
- Network congestion may cause timeouts on transaction submissions
- Calling non-existent contract addresses returns empty result rather than 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, block info, transaction receipt, 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-base-network-rpc-endpoint-d5f2089c/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)