# Synapse API — Superseed Gas Estimator

> Synapse API — Superseed 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 Superseed blockchain network before submission

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/superseed/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-superseed-gas-estimator-af566dcd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TU30WbmnIrrRdLrjkHQ0H

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-superseed-gas-estimator-af566dcd -d '<json body>'
```

Example prompt: Before I send this contract call on Superseed, can you estimate the gas it'll use? The transaction is from 0xAbC...123 to 0xDeF...456 with calldata 0xa9059cbb... and a value of 0.

## When to prefer this

Use this endpoint when you need a gas estimate specifically for the Superseed blockchain network and want a pay-per-call model without managing RPC infrastructure. Prefer this over direct RPC calls when you don't have a Superseed node configured or want a simple REST interface instead of raw JSON-RPC.

## Known failure modes

- Invalid address format for 'to' or 'from' fields returns an error
- Malformed or invalid 'data' hex string causes a simulation failure
- Insufficient funds simulation may return a revert error
- Network downtime or RPC unavailability returns a 5xx error
- Missing required fields may return a 400 bad request
- Transaction would revert on-chain causes estimate to fail with revert reason

## 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 gas estimate (in gas units) for the described transaction on the Superseed network, allowing callers to predict fees and decide whether to proceed before actually submitting the transaction on-chain.

## 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-superseed-gas-estimator-af566dcd/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)