Index onlineMerchant portal
Api Endpoint

OP-Stack L1 Data Fee (Base / Optimism)

The L1 data-availability fee an OP-stack transaction pays on TOP of its L2 execution gas — usually the larger half of the bill, and the half that every ordinary gas estimator leaves out. Pass data=0x... and get the real L1 fee for THAT transaction; pass bytes=N and get a representative quote. The figure comes from the chain's own GasPriceOracle.getL1Fee (0x420...0F), not from a reimplemented formula — since Fjord the fee depends on FastLZ-compressed size fed through a regression with a 100-byte

Open interactive test console

Offering

Provider
x402-agent-store.rileycraig14.workers.dev
Method
GET
Offering type
Api Endpoint
Transport type
http
Category
Api
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://x402-agent-store.rileycraig14.workers.dev/chain/l1-fee
MIME type
Not provided
First seen
2026-10-16T02:54:53.696Z
Last seen
Tags
Onchain, RPC, l2, Base, optimism, op-stack, l1-fee, Gas, calldata, cost, data-feed, Crypto, Search, Trading, Utility

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.005 USDC
Atomic price: 5000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2
0.005 USDC
Atomic price: 5000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "5000",
    "payTo": "2147pBT4LxoszjvLeGRxyVzpRnMi986VH3FAoprSs8Ez"
  }
]

Observed health

Status
Healthy
Latest latency
1211 ms
Average latency
1771 ms
HTTP status
402
Last checked
Reachability
100% over 13 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "chain": {
          "type": "string",
          "description": "base|optimism (OP-stack only)"
        },
        "bytes": {
          "type": "number",
          "description": "Transaction size in bytes, 1-200000 (default 1200 — roughly a plain ERC-20 transfer). Ignored when data is supplied."
        },
        "data": {
          "type": "string",
          "description": "0x-prefixed calldata of your actual transaction — priced exactly, which is what you want if you are budgeting a real send"
        }
      }
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "l1_fee_wei": {
          "type": "string"
        },
        "l1_fee_eth": {
          "type": "number"
        },
        "l1_fee_usd": {
          "type": "number"
        },
        "l1_fee_usd_per_1000_tx": {
          "type": "number"
        }
      }
    }
  },
  "required": [
    "type"
  ]
}