# Saylor Innovations Multi-Chain Gas Comparison (Base + Ethereum)

> Saylor Innovations Multi-Chain Gas Comparison (Base + Ethereum) is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-30).

Fetches and compares current gas prices across Base and Ethereum EVM chains, identifying the cheapest option

## Facts

- Endpoint: GET https://saylorinnovations.com/api/evm/gas?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-multi-chain-gas-comparison-base-ethereum-c86a7cf6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J2TnHbMpCISZIFyg2w_Ep

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 saylor-innovations-multi-chain-gas-comparison-base-ethereum-c86a7cf6
```

Example prompt: What are the current gas prices on Base and Ethereum right now, and which one is cheaper to transact on?

## When to prefer this

Use this endpoint when you need a quick, real-time multi-chain gas comparison between Base and Ethereum without building your own RPC infrastructure. Ideal for DeFi agents, transaction routers, or cost-optimization workflows that need to decide which EVM chain to use before submitting a transaction. Prefer this over raw RPC calls when you want a pre-aggregated comparison with a 'cheapest' signal already computed.

## Known failure modes

- Upstream RPC node unavailable — returns error or stale data
- Rate limiting at $0.003/call — multiple rapid calls may be throttled
- Chain data temporarily unavailable for one network — partial results with null entries
- Payment failure via x402 protocol — call rejected before reaching the API

## How this service works

Multi-Chain Gas Comparison. Multi-chain gas comparison in one call: Base, Ethereum, Arbitrum, Optimism and Polygon with slow/standard/fast tiers from fee history, base fee, and the USD cost of a simple transfer, cheapest chain first.

## Output

Returns a JSON object containing a timestamp (generated_at), an array of chain objects each with their current gas price data, and a 'cheapest' field identifying the lowest-cost chain (or null if undetermined).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "generated_at",
      "chains"
     ],
     "properties": {
      "chains": {
       "type": "array",
       "items": {
        "type": "object"
       }
      },
      "cheapest": {
       "type": [
        "string",
        "null"
       ]
      },
      "generated_at": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-multi-chain-gas-comparison-base-ethereum-c86a7cf6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)