# Delx Commerce — EVM Value Plus Fee Budget Calculator

> Delx Commerce — EVM Value Plus 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 total required Wei amount by adding a transaction value (in Wei) and its associated fee ceiling, useful for EVM preflight budget checks before executing on-chain transactions.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/evm-value-plus-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-value-plus-fee-budget-calculator-d60fea5e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QM5hPgrW_ivfvDjQ81Anu

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-value-plus-fee-budget-calculator-d60fea5e -d '<json body>'
```

Example prompt: Before I send 0.05 ETH (50000000000000000 wei) on-chain, calculate the total required wei I need including a fee ceiling of 42000000000000 wei so I know my wallet budget is sufficient.

## When to prefer this

Use this endpoint when an EVM agent or workflow needs a verifiable, tamper-evident preflight computation of total transaction budget (value + fee ceiling) before submitting an on-chain transaction, especially when auditability (SHA-256 evidence, no data retention) and pay-per-result micro-payment pricing matter. Prefer over manual arithmetic when operating in autonomous agent pipelines that require proof of computation.

## Known failure modes

- Invalid or non-numeric string provided for value_wei or fee_ceiling_wei — likely returns a validation error
- Missing required fields — API may return a 4xx error indicating which parameters are absent
- Overflow if extremely large Wei values are provided beyond safe integer bounds
- Payment failure via x402 (USDC on Base/Solana) if the $0.001 micro-payment is not completed

## 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 containing the original value_wei, the computed required_wei (value plus fee ceiling), and the fee_ceiling_wei, along with a 'pass' status, the operation name, and an evidence block confirming no external calls were made and inputs were not retained (only an input SHA-256 hash is recorded).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "value_wei": {
   "type": "string",
   "maxLength": 8192,
   "description": "Value Wei supplied to EVM Value Plus Fee Budget; used only for this bounded calculation and processed in memory without retention."
  },
  "fee_ceiling_wei": {
   "type": "string",
   "maxLength": 8192,
   "description": "Fee Ceiling Wei supplied to EVM Value Plus Fee Budget; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "value_wei": "50000000000000000",
   "required_wei": "50042000000000000",
   "fee_ceiling_wei": "42000000000000"
  },
  "schema": "delx/util-evm-value-plus-fee-budget/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "c97960a555f73366664990411512e0dbb6ff9e788f1f8df5e0e28f4eb3bedeb6",
   "external_calls": 0
  },
  "operation": "evm_preflight:evm_value_plus_fee_budget"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-evm-value-plus-fee-budget-calculator-d60fea5e/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)