# Base L2 Gas Fee Estimator for x402 vs Standard Token Operations

> Base L2 Gas Fee Estimator for x402 vs Standard Token Operations is a paid API for AI agents from bot-bazaar.fly.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Estimates Base L2 gas costs in ETH and USD for common token operations, comparing standard ERC-20 transfers and direct EIP-3009 against zero-gas facilitator-settled x402 EIP-3009 transfers.

## Facts

- Endpoint: GET https://bot-bazaar.fly.dev/v1/x402/gas-fee-estimator?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-l2-gas-fee-estimator-for-x402-vs-standard-token-operations-dc3935a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OtmiDPdJ4GFso3VJhPpbG

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 base-l2-gas-fee-estimator-for-x402-vs-standard-token-operations-dc3935a0
```

Example prompt: What's the estimated gas cost in ETH and USD for an erc20_transfer versus an eip3009_facilitator transfer on Base L2, so I can see how much the x402 zero-gas model actually saves?

## When to prefer this

Use this endpoint when you need to compare gas costs between x402 facilitator-settled EIP-3009 transfers and standard on-chain token operations on Base L2. Ideal for agents making payment routing decisions, developers benchmarking x402 payment overhead, or anyone needing real-time ETH/USD gas estimates for Base token operations.

## Known failure modes

- Invalid operation type parameter returns an error or empty result
- Gas price oracle unavailability may cause stale or missing USD estimates
- Network congestion on Base may cause estimates to lag real-time prices
- Missing required 'operation' query parameter may return a default or error response

## How this service works

Estimate Base L2 gas costs in ETH and USD for common token operations vs zero-gas facilitator-settled x402 EIP-3009 transfers.

## Output

Returns estimated gas costs in both ETH and USD for the requested operation type on Base L2, with comparative data across operation types (eip3009_facilitator, erc20_transfer, eip3009_direct, uniswap_swap) to highlight the cost savings of x402 facilitator-settled transfers.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "operation": {
       "type": "string",
       "description": "Operation type (eip3009_facilitator, erc20_transfer, eip3009_direct, uniswap_swap)"
      }
     }
    }
   },
   "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/base-l2-gas-fee-estimator-for-x402-vs-standard-token-operations-dc3935a0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bot-bazaar.fly.dev](https://www.zero.xyz/host/bot-bazaar.fly.dev/llms.txt)