# Synapse API — Avalanche RPC Endpoint

> Synapse API — Avalanche 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 2026-09-13).

Provides a pay-per-call JSON-RPC gateway to the Avalanche blockchain network, enabling agents to query chain state, submit transactions, and interact with smart contracts.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/avalanche/rpc
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-avalanche-rpc-endpoint-c82cb7f2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MYANgyEyifmuEJC1L_FXV

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-avalanche-rpc-endpoint-c82cb7f2 -d '<json body>'
```

Example prompt: Can you check the current AVAX balance for address 0xAbc123... on the Avalanche network using eth_getBalance?

## When to prefer this

Choose this endpoint when you need programmatic, pay-per-call access to the Avalanche blockchain without managing your own node or committing to a monthly subscription. Ideal for agents making occasional or bursty RPC calls across 57+ supported networks under the same Synapse API umbrella.

## Known failure modes

- Invalid RPC method name returns JSON-RPC error with code -32601
- Malformed params array causes parse error with code -32700
- Payment not included or insufficient results in HTTP 402 response
- Network congestion or node unavailability causes timeout or 503
- Invalid transaction data on eth_sendRawTransaction returns execution revert 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 the queried blockchain data (e.g. balance in wei, block object, transaction hash, contract return value) 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-avalanche-rpc-endpoint-c82cb7f2/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)