# Synapse API — BNB Chain Gas Estimator

> Synapse API — BNB Chain 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 2026-09-14).

Estimates gas costs for a transaction on the BNB Smart Chain network given transaction parameters

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/bnb/gas/estimate
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-bnb-chain-gas-estimator-36cdee56
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jeFDzgxqwjQCoq5sha0uh

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-bnb-chain-gas-estimator-36cdee56 -d '<json body>'
```

Example prompt: Estimate the gas needed for a BNB Smart Chain transaction from 0xAbC...123 to 0xDeF...456 with a value of 0.5 BNB and no calldata.

## When to prefer this

Use this endpoint when you need a quick, pay-per-call gas estimate for a BNB Smart Chain (BSC) transaction without running your own BNB node or RPC infrastructure. Ideal for agents that need to pre-flight a transaction cost check before executing on-chain, or for wallets and DeFi tools that need to set gas limits dynamically.

## Known failure modes

- Invalid or malformed Ethereum-style address for 'to' or 'from' fields returns an error
- Malformed hex data in 'data' field may cause estimation failure
- Transaction that would revert on-chain may return an estimation error or revert message
- Network unavailability or RPC issues may result in timeout or 500 error
- Missing required fields may return a validation 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 an estimated gas amount (in gas units) for the described BNB Smart Chain transaction, allowing callers to set appropriate gas limits and calculate total transaction costs before submission.

## 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-bnb-chain-gas-estimator-36cdee56/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)