# Delx Commerce — EVM Base Fee Growth Ceiling Calculator

> Delx Commerce — EVM Base Fee Growth Ceiling Calculator is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Computes the maximum possible EVM base fee after a given number of blocks using the EIP-1559 growth formula, given a current base fee and growth fraction.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/evm-base-fee-growth-ceiling?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-evm-base-fee-growth-ceiling-calculator-e15b51c1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_D7Jayude8YsJO0TD2pJRB

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-base-fee-growth-ceiling-calculator-e15b51c1 -d '<json body>'
```

Example prompt: Calculate the EVM base fee growth ceiling for 3 blocks, with a current base fee of 1000000000 wei and a growth fraction of 0.125, so I can figure out the worst-case fee before submitting my transaction.

## When to prefer this

Use this endpoint when you need a fast, verifiable, pay-per-call computation of the EIP-1559 base fee ceiling with cryptographic evidence of no data retention and no external calls — ideal for EVM transaction preflight checks in autonomous agents that require auditability and no signup overhead.

## Known failure modes

- Missing or invalid 'blocks' integer — returns error or unexpected result
- Invalid 'current_base_fee_wei' string (non-numeric or too large) — may return error
- Missing 'growth_fraction' parameter — computation may fail or return incorrect ceiling
- Payment failure via x402 protocol — 402 response if USDC payment is not attached
- Network timeout — service unavailable response

## 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 computed fee_ceiling_wei (the maximum possible base fee in wei after the specified number of blocks), the input block count, a status field ('pass'), an operation identifier, and an evidence object with a SHA-256 hash of the input, a flag confirming no data was retained, and a count of zero external calls made.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "blocks": {
   "type": "integer",
   "description": "Blocks supplied to EVM Base Fee Growth Ceiling; used only for this bounded calculation and processed in memory without retention."
  },
  "growth_fraction": {
   "type": "number",
   "description": "Growth Fraction supplied to EVM Base Fee Growth Ceiling; used only for this bounded calculation and processed in memory without retention."
  },
  "current_base_fee_wei": {
   "type": "string",
   "maxLength": 8192,
   "description": "Current Base Fee Wei supplied to EVM Base Fee Growth Ceiling; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "blocks": 3,
   "fee_ceiling_wei": "1423828125"
  },
  "schema": "delx/util-evm-base-fee-growth-ceiling/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "e6331adf36b1a6016a316e2580f099fd04ebb97045f034d65e705d7114cceb67",
   "external_calls": 0
  },
  "operation": "evm_preflight:evm_base_fee_growth_ceiling"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-evm-base-fee-growth-ceiling-calculator-e15b51c1/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)