# Synapse API — Linea Gas Estimator

> Synapse API — Linea 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 2026-10-14).

Estimates gas costs for a transaction on the Linea blockchain network given sender, recipient, data, and value.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/linea/gas/estimate?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-linea-gas-estimator-213ee375
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_H3OqN8p7I3p0Wx-arFIWe

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-linea-gas-estimator-213ee375 -d '<json body>'
```

Example prompt: Estimate the gas needed to send 0.5 ETH from 0xAbC...123 to 0xDeF...456 on the Linea network with no calldata.

## When to prefer this

Use this endpoint when you need a gas estimate specifically on the Linea L2 blockchain before submitting a transaction. Prefer it over generic gas tools when your transaction targets Linea and you want a pay-per-call model without managing your own RPC infrastructure or API keys.

## Known failure modes

- Invalid or malformed Ethereum address in 'to' or 'from' fields — returns error or 400
- Reverting transaction simulation — gas estimate may fail or return revert reason
- Missing required fields — endpoint may reject with validation error
- Linea RPC node unavailable — upstream timeout or 503
- Non-hex or malformed 'data' field — parse 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 gas estimate (typically in gas units) for the described Linea transaction, allowing the caller to predict fees before broadcasting. May include fields such as estimated gas limit and potentially gas price or fee data relevant to the Linea 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-linea-gas-estimator-213ee375/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)