# Robinhood Chain Gas Price & Estimate

> Robinhood Chain Gas Price & Estimate is a paid API for AI agents from x402-services-production.up.railway.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Returns the current gas price on Robinhood Chain, and optionally estimates gas units and ETH cost for a specific transaction.

## Facts

- Endpoint: POST https://x402-services-production.up.railway.app/api/rhchain/gas
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/robinhood-chain-gas-price-estimate-990ebb82
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LsPm_96Rp70v6ziJucFzG

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 robinhood-chain-gas-price-estimate-990ebb82 -d '<json body>'
```

Example prompt: What's the current gas price on Robinhood Chain, and how much ETH would it cost to call this contract — sending to 0xAbC...123 with calldata 0xdeadbeef from my wallet 0x456...789?

## When to prefer this

Use this endpoint when you specifically need gas price data or cost estimates for Robinhood Chain (rhchain), as opposed to Ethereum mainnet or other EVM chains. It is ideal for pre-flight checks before submitting transactions, for trading bots that gate on gas costs, or for any agent that needs to display or decide based on transaction fees on Robinhood Chain.

## Known failure modes

- Invalid or malformed to/data/from fields cause estimation to fail with an RPC error
- If the Robinhood Chain RPC node is unreachable, the endpoint returns a connectivity error
- Missing required body fields returns a validation error
- Providing an address that is not a valid EVM address may return an estimation error

## How this service works

Robinhood Chain gas: current gas price, plus a gas estimate + ETH cost if you send { to, data?, from? }.

## Output

Returns the current gas price on Robinhood Chain (in gwei or wei). If a transaction object (to, data, from) is provided, also returns the estimated gas units for that transaction and the resulting ETH cost at the current gas price.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json"
     ],
     "type": "string"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/robinhood-chain-gas-price-estimate-990ebb82/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-services-production.up.railway.app](https://www.zero.xyz/host/x402-services-production.up.railway.app/llms.txt)