# Synapse API — Ink Network Gas Estimator

> Synapse API — Ink Network Gas Estimator 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).

Estimates gas cost for a transaction on the Ink blockchain network before submission

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/ink/gas/estimate
- 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-ink-network-gas-estimator-c6dd2d99
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__-Zi_7KaMFR3Xbm2vVD-J

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-gas-estimator-c6dd2d99 -d '<json body>'
```

Example prompt: Estimate the gas needed to send 0.5 ETH on the Ink network from 0xSenderAddress to 0xRecipientAddress with no calldata, so I know the fee before I submit the transaction.

## When to prefer this

Use this endpoint when you need a quick, pay-per-call gas estimate specifically for the Ink blockchain network without running your own RPC node. Prefer this over generic ETH gas estimators when targeting Ink-specific transactions, or when you need a lightweight, stateless estimation call without managing infrastructure.

## Known failure modes

- Invalid or malformed address in 'to' or 'from' fields returns an error
- Unsupported calldata format may cause estimation failure
- Network connectivity issues with the Ink RPC may result in timeout or 5xx error
- Insufficient or malformed 'value' field may cause estimation errors
- Payment failure via x402 returns 402 Payment Required before the estimate is served

## 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 an estimated gas amount (in gas units) for the specified transaction on the Ink blockchain network, allowing agents or users to predict fees before broadcasting the transaction.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "to": {
   "type": "string"
  },
  "data": {
   "type": "string"
  },
  "from": {
   "type": "string"
  },
  "value": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-ink-network-gas-estimator-c6dd2d99/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)