# Synapse API — Polygon Gas Estimator

> Synapse API — Polygon 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 2026-10-13).

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

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/polygon/gas/estimate?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-polygon-gas-estimator-e2a76e2b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tgwbd198yRMC7OTBzlQcd

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-polygon-gas-estimator-e2a76e2b -d '<json body>'
```

Example prompt: Estimate the gas needed for a Polygon transaction from 0xABC...123 to 0xDEF...456 with a value of 1000000000000000000 (1 MATIC) and no calldata.

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call gas estimate specifically on the Polygon network without running your own node or maintaining an RPC subscription. Ideal for agents that need to budget fees before submitting transactions across 57+ supported chains via a single unified API.

## Known failure modes

- Invalid or malformed address in 'to' or 'from' fields returns an error
- Malformed calldata in 'data' field causes estimation failure
- Transaction would revert on-chain, causing the estimator to return an error or inflated estimate
- Network congestion or RPC unavailability may cause timeouts
- Missing required fields may return a 400 bad request

## 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) required to execute the described transaction on the Polygon network. This lets callers determine fee costs before broadcasting a 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-polygon-gas-estimator-e2a76e2b/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)