# Crest Gas Oracle

> Crest Gas Oracle is a paid API for AI agents from data.crestsystems.ai, paid per call via x402, $0.002/call, status down (last checked 2026-10-12).

Fetches current gas price estimates (fast/standard/slow in gwei) across Base, Ethereum, Polygon, Arbitrum, and Optimism EVM chains

## Facts

- Endpoint: GET https://data.crestsystems.ai/data/gas?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/data-crestsystems-ai-2c796fa3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tBVCMLcbHOx0og7ewRICA

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 data-crestsystems-ai-2c796fa3
```

Example prompt: What are the current gas prices on Ethereum, Base, and Arbitrum right now — give me the fast, standard, and slow estimates in gwei so I can decide when and where to send my transaction.

## When to prefer this

Use this endpoint when you need a multi-chain gas price overview across major EVM networks in a single call. Prefer it over chain-specific RPC calls when you want normalized fast/standard/slow tiers without parsing raw mempool data yourself. Ideal for agents deciding which chain to use for a transaction or timing submissions for cost efficiency.

## Known failure modes

- Upstream chain RPC unavailable — partial or empty results for affected chains
- Rate limiting or payment failure — HTTP 402 if payment not provided
- Network timeout — slow response if any chain's data feed is delayed
- Stale data — estimates may lag real-time mempool if cache is not refreshed

## How this service works

Crest · gas_oracle -- Fetch current gas prices across multiple EVM chains. Returns fast/standard/slow estimates in gwei for Base, Ethereum, Polygon, Arbitrum, and Optimism.

## Output

Returns fast, standard, and slow gas price estimates in gwei for each of the supported EVM chains: Base, Ethereum, Polygon, Arbitrum, and Optimism. Useful for deciding optimal transaction timing and chain selection.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {}
 }
}
```

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/data-crestsystems-ai-2c796fa3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from data.crestsystems.ai](https://www.zero.xyz/host/data.crestsystems.ai/llms.txt)