# Synapse API — Ink Network RPC Endpoint

> Synapse API — Ink 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 2026-10-28).

Provides JSON-RPC access to the Ink blockchain network, enabling on-chain queries and transaction submission via pay-per-call micropayments.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/ink/rpc?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-ink-network-rpc-endpoint-faccc790
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a7Y4HHDGm3niLnIpUzwTt

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-ink-network-rpc-endpoint-faccc790 -d '<json body>'
```

Example prompt: Can you call eth_getBalance for address 0xAbC123... on the Ink blockchain network using JSON-RPC and tell me the current balance?

## When to prefer this

Choose this endpoint when you need direct JSON-RPC access to the Ink blockchain network specifically, particularly for querying chain state, submitting transactions, or interacting with smart contracts on Ink. Prefer this over generic multi-chain RPCs when Ink network compatibility and pay-per-call micropayment billing (via x402/USDC) is acceptable.

## Known failure modes

- Invalid RPC method name returns JSON-RPC error -32601
- Malformed params array causes parse error -32700
- Network congestion or node unavailability returns 503 or timeout
- Payment not received causes 402 Payment Required response
- Invalid transaction data causes execution revert or -32000 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

A standard JSON-RPC response object containing the result field with on-chain 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-ink-network-rpc-endpoint-faccc790/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)