# Synapse API — Abstract Gas Estimator

> Synapse API — Abstract 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 2026-10-11).

Estimates the gas cost for a transaction on Abstract (or supported EVM-compatible) blockchain networks given transaction parameters

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/abstract/gas/estimate?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-abstract-gas-estimator-414de0b9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Gc-5QWlXBTiYJAr09Si3Q

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-abstract-gas-estimator-414de0b9 -d '<json body>'
```

Example prompt: Estimate the gas needed for a transaction from 0xAbC...123 to 0xDeF...456 with value 0 and calldata 0xa9059cbb...

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call gas estimate for Abstract network (or compatible EVM chain) transactions without provisioning your own RPC infrastructure. Particularly useful for agents that need pre-flight cost checks before executing on-chain actions.

## Known failure modes

- Invalid or malformed address in 'to' or 'from' fields returns a validation error
- Malformed or non-hex calldata in 'data' field causes a parse error
- Network unavailability or RPC node failure returns a 503 or timeout
- Transaction simulation reverts (e.g. insufficient balance, bad calldata) may return an error or revert reason
- 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 a gas estimate (in gas units) for the described transaction, allowing the caller to anticipate fees before broadcasting 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-abstract-gas-estimator-414de0b9/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)