# x402.professorsausages.com Gas Oracle Transaction Cost Estimator

> x402.professorsausages.com Gas Oracle Transaction Cost Estimator is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Estimates the total USD cost of a specific transaction on a given chain, including OP-stack L1 data fee breakdown

## Facts

- Endpoint: GET https://x402.professorsausages.com/gas-oracle/:chain/estimate
- 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/x402-professorsausages-com-gas-oracle-transaction-cost-estimator-85d09951
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BVy0nshCzoWDp2cj2FJhy

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 x402-professorsausages-com-gas-oracle-transaction-cost-estimator-85d09951
```

Example prompt: What will it cost in USD to execute this transaction on Base at standard speed — including the OP-stack L1 data fee? Give me a full breakdown of execution cost versus L1 calldata fee.

## When to prefer this

Use this endpoint when you need a full USD cost breakdown for a specific transaction on an OP-stack chain (e.g. Optimism, Base), especially when the L1 calldata fee component matters — such as for cost modeling, fee transparency, or smart contract interaction budgeting. Prefer this over the current gas market endpoint when you have a specific transaction to price rather than just wanting the current gas market rates.

## Known failure modes

- Unsupported chain identifier returns an error or empty response
- Missing or malformed transaction input causes validation failure
- Chain is not an OP-stack chain, so l1DataFee is null (not an error, but callers expecting it may be surprised)
- Network congestion or RPC unavailability may cause stale or failed fetch
- Incorrect speed enum value (not slow/standard/fast) may cause parameter rejection

## How this service works

USD cost of a specific tx incl. OP-stack L1 data fee

## Output

Returns a structured object with the chain name, block number, gas used, speed tier, execution cost (L2 native + USD), L1 data fee (for OP-stack chains, or null otherwise), total fees in native and USD, and a comparable Ethereum cost for reference, along with a fetchedAt timestamp.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-professorsausages-com-gas-oracle-transaction-cost-estimator-85d09951/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.professorsausages.com](https://www.zero.xyz/host/x402.professorsausages.com/llms.txt)