# Biosfera Gas Now — EVM Chain Gas Price Oracle

> Biosfera Gas Now — EVM Chain Gas Price Oracle is a paid API for AI agents from biosfera.46-62-215-147.sslip.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).

Returns current gas prices (legacy price, base fee, priority fee) in gwei for Base, Ethereum, Arbitrum, Optimism, or Polygon, along with the reference block number.

## Facts

- Endpoint: GET https://biosfera.46-62-215-147.sslip.io/o/gas-now?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/biosfera-gas-now-evm-chain-gas-price-oracle-2eb6406f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Cg4auuO_tHdOV68Szi0Ov

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 biosfera-gas-now-evm-chain-gas-price-oracle-2eb6406f
```

Example prompt: Before I send this transaction, what's the current gas price on Base — give me the base fee, priority fee, and legacy gas price in gwei.

## When to prefer this

Use this endpoint when you need real-time EVM gas prices across major chains (Base, Ethereum, Arbitrum, Optimism, Polygon) before submitting a transaction. Prefer it over on-chain calls when you want a quick REST API lookup without running your own node or RPC integration. It provides both EIP-1559 (base fee + priority fee) and legacy gas price in a single call, making it ideal for transaction fee estimation in wallets, bots, and DeFi automation.

## Known failure modes

- Invalid or unsupported chain value returns an error (only base, ethereum, arbitrum, optimism, polygon are accepted)
- Missing required 'chain' query parameter returns a validation error
- Network connectivity issues to the RPC provider may return a timeout or 503
- Stale data if the underlying RPC node is lagging behind the chain tip

## How this service works

Use when you need current gas prices on Base, Ethereum, Arbitrum, Optimism or Polygon before sending a transaction: legacy gas price, latest base fee and suggested priority fee in gwei, plus the block they refer to.

## Output

Returns current gas pricing data for the requested EVM chain: legacy gas price in gwei, latest base fee in gwei, suggested priority fee (miner tip) in gwei, and the block number these values correspond to.

## 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",
     "required": [
      "chain"
     ],
     "properties": {
      "chain": {
       "enum": [
        "base",
        "ethereum",
        "arbitrum",
        "optimism",
        "polygon"
       ],
       "type": "string"
      }
     },
     "additionalProperties": false
    }
   },
   "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/biosfera-gas-now-evm-chain-gas-price-oracle-2eb6406f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from biosfera.46-62-215-147.sslip.io](https://www.zero.xyz/host/biosfera.46-62-215-147.sslip.io/llms.txt)