# chain.openverbs.com EVM Gas Conditions

> chain.openverbs.com EVM Gas Conditions is a paid API for AI agents from chain.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Returns live gas price, EIP-1559 base fee, and suggested max priority fee for a specified EVM chain in both wei and gwei.

## Facts

- Endpoint: POST https://chain.openverbs.com/v1/gas
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chain-openverbs-com-evm-gas-conditions-74af12ba
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_up9jUfhXPZkvQiRxicbTB

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 chain-openverbs-com-evm-gas-conditions-74af12ba -d '<json body>'
```

Example prompt: What are the current gas conditions on Arbitrum — give me the base fee, gas price, and suggested priority fee in gwei right now?

## When to prefer this

Use this endpoint when you need authoritative, real-time EVM gas parameters that cannot be computed client-side — especially when preparing transactions with EIP-1559 fee fields, monitoring gas trends, or deciding whether to delay a transaction. Prefer this over static fee estimates or cached data when accuracy and freshness are critical.

## Known failure modes

- Unsupported chain name returns a validation error
- RPC endpoint downtime may cause delays even with fallback logic
- Stale data if block production is slow on the target chain
- Missing or malformed 'chain' field defaults to ethereum silently

## How this service works

Live gas conditions for an EVM chain: current gas price, the latest block's base fee (EIP-1559) and the suggested max priority fee — all in both wei and gwei. Ground truth an agent can't compute. Reads live on-chain data with automatic endpoint fallback.

## Output

Returns live on-chain gas data for the requested EVM chain: current gas price, latest block base fee (EIP-1559), and suggested max priority fee — all expressed in both wei and gwei. Data is read directly from the chain with automatic RPC endpoint fallback for reliability.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string",
     "enum": [
      "POST"
     ]
    },
    "bodyType": {
     "type": "string",
     "enum": [
      "json",
      "form-data",
      "text"
     ]
    },
    "body": {
     "type": "object",
     "properties": {
      "chain": {
       "type": "string",
       "enum": [
        "ethereum",
        "base",
        "arbitrum",
        "optimism",
        "polygon"
       ],
       "description": "EVM chain to query. One of: ethereum, base, arbitrum, optimism, polygon. Default \"ethereum\"."
      }
     },
     "required": [],
     "additionalProperties": false
    }
   },
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "additionalProperties": false
  }
 },
 "required": [
  "input"
 ]
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chain-openverbs-com-evm-gas-conditions-74af12ba/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain.openverbs.com](https://www.zero.xyz/host/chain.openverbs.com/llms.txt)