# Delx Commerce — EVM Blob Fee Budget Calculator

> Delx Commerce — EVM Blob Fee Budget Calculator is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).

Computes the maximum blob fee ceiling in wei given blob gas and max fee per blob gas, for EVM transaction preflight estimation.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/evm-blob-fee-budget?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-evm-blob-fee-budget-calculator-a96db1cb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W41vYYBaLzdJxE83dk-Yv

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 delx-commerce-evm-blob-fee-budget-calculator-a96db1cb -d '<json body>'
```

Example prompt: Calculate the EVM blob fee ceiling for a transaction with 131072 blob gas and a max fee per blob gas of 2 wei — I need the result in wei before I submit.

## When to prefer this

Use this endpoint when you need a fast, cheap ($0.001 USDC), verifiable, in-memory-only blob fee ceiling calculation for EVM transaction preflight without any data retention — ideal for AI agents needing trustless gas estimation before submitting EIP-4844 blob transactions on Ethereum.

## Known failure modes

- Missing or invalid blob_gas integer causes computation error
- max_fee_per_blob_gas_wei exceeds maxLength of 8192 characters
- Non-numeric string in max_fee_per_blob_gas_wei field returns validation error
- Payment not provided or insufficient USDC results in 402 response
- Malformed JSON body returns 400 bad request

## How this service works

Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.

## Output

Returns a JSON object with the computed blob_fee_ceiling_wei value, an operation identifier (evm_preflight:evm_blob_fee_budget), a pass/fail status, and a verifiable evidence block including an input SHA-256 hash confirming no data retention and zero external calls.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "blob_gas": {
   "type": "integer",
   "description": "Blob Gas supplied to EVM Blob Fee Budget; used only for this bounded calculation and processed in memory without retention."
  },
  "max_fee_per_blob_gas_wei": {
   "type": "string",
   "maxLength": 8192,
   "description": "Max Fee Per Blob Gas Wei supplied to EVM Blob Fee Budget; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "blob_fee_ceiling_wei": "262144"
  },
  "schema": "delx/util-evm-blob-fee-budget/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "452aa5227d3b7d47a78b8729ad6d09af441ba3bf8df5aa35b34a7f7e8c38965f",
   "external_calls": 0
  },
  "operation": "evm_preflight:evm_blob_fee_budget"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-evm-blob-fee-budget-calculator-a96db1cb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from commerce.delx.ai](https://www.zero.xyz/host/commerce.delx.ai/llms.txt)