# Synapse API — SUI Gas Estimation

> Synapse API — SUI Gas Estimation 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 2026-09-16).

Estimates the gas fee for a transaction on the SUI blockchain network given sender, recipient, value, and calldata.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/sui/gas/estimate
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-sui-gas-estimation-a7128f43
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hXNY8Lv0REMgOcMo5iW_H

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-sui-gas-estimation-a7128f43 -d '<json body>'
```

Example prompt: Can you estimate the gas fee for a SUI transaction from address 0xabc123 to 0xdef456, sending 1000000000 MIST with calldata 0x1234?

## When to prefer this

Use this endpoint when you need a quick, pay-per-call gas estimate for SUI blockchain transactions without running a full node or maintaining RPC infrastructure. Ideal for agents building SUI transaction pipelines, DApp backends, or wallets that need real-time fee previews before submitting transactions.

## Known failure modes

- Invalid or malformed address fields causing a 400 error
- Missing required fields (to, from) returning a validation error
- Network unavailability or SUI node connectivity issues causing 500 errors
- Unsupported calldata format causing estimation failure
- Extremely complex transactions exceeding estimation limits

## 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 cost for the described SUI transaction, typically expressed in MIST or SUI gas units, allowing the caller to determine transaction feasibility and budget before submitting to the network.

## 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-sui-gas-estimation-a7128f43/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)