# Synapse API — Mantle RPC Endpoint

> Synapse API — Mantle 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).

Proxies JSON-RPC calls to the Mantle blockchain network, enabling agents to query chain state, submit transactions, and interact with Mantle smart contracts.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/mantle/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-mantle-rpc-endpoint-3f3a5de2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HQYviU3gM0Q6GzMi5E7VA

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-mantle-rpc-endpoint-3f3a5de2 -d '<json body>'
```

Example prompt: What's the current ETH balance of wallet 0xAbC...123 on the Mantle network? Use eth_getBalance with block tag 'latest'.

## When to prefer this

Use this endpoint when you specifically need to interact with the Mantle L2 blockchain via standard Ethereum JSON-RPC calls. Prefer this over generic Web3 providers when you need pay-per-call pricing with no subscription commitment, or when operating across multiple chains via the same Synapse API surface.

## Known failure modes

- Invalid RPC method name returns error code -32601 (method not found)
- Malformed params array returns -32602 (invalid params)
- Network congestion or Mantle node downtime may cause timeouts
- Payment failure (402) if USDC balance is insufficient
- Submitting transactions to wrong chain ID may result in rejected transactions

## 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 'id', 'jsonrpc', and 'result' fields. The result content depends on the method called — e.g. a hex balance string for eth_getBalance, a block object for eth_getBlockByNumber, or a transaction receipt for eth_getTransactionReceipt.

## 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-mantle-rpc-endpoint-3f3a5de2/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)