# Synapse API — Solana Gas Estimator

> Synapse API — Solana 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 2026-10-16).

Estimates the gas (transaction fee) cost for a given Solana transaction before it is submitted to the network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/solana/gas/estimate?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-solana-gas-estimator-ce0dce0d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wLOnrbkhUULfl1t9b3xkM

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-solana-gas-estimator-ce0dce0d -d '<json body>'
```

Example prompt: Before I send this Solana transaction from wallet 7xKq...abc to 9mPr...xyz with data 0xdeadbeef and value 0.5 SOL, can you estimate what the gas fee will be?

## When to prefer this

Use this endpoint when you need a quick, pay-per-call Solana gas estimate without managing your own RPC node or paying for a subscription plan. It is well-suited for agents or apps that only occasionally need fee estimation and want to avoid standing infrastructure costs. Prefer it over raw RPC calls when you want a simple REST interface abstracted from Solana's native API.

## Known failure modes

- Invalid or malformed wallet address returns a 400 error
- Missing required fields (e.g. no 'to' or 'from') results in validation error
- Network connectivity issues to Solana RPC may cause timeout or 503
- Malformed transaction data string may result in parse error
- Payment not included or insufficient USDC returns 402

## 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/fee cost for the described Solana transaction, allowing the caller to understand the network cost before submitting. Typically includes fee amounts in SOL or lamports.

## 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-solana-gas-estimator-ce0dce0d/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)