# Delx Commerce — EVM Next Base Fee Bound

> Delx Commerce — EVM Next Base Fee Bound 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 bounded lower and upper range (in wei) for the next EVM block's base fee given a current base fee and a maximum change fraction

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/evm-next-base-fee-bound?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-next-base-fee-bound-d91f0dfa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fE6mou5qqO6iYTn2TEnxZ

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-next-base-fee-bound-d91f0dfa -d '<json body>'
```

Example prompt: Before I submit this transaction on Base, calculate the lower and upper bounds for the next block's base fee — the current base fee is 1000000000 wei and the maximum change fraction is 0.125.

## When to prefer this

Choose this endpoint when you need a fast, verifiable, privacy-preserving calculation of the next EVM base fee range without setting up your own computation logic. It is ideal for AI agents doing EVM transaction preflight checks on the Base network, especially when you want cryptographic evidence of computation (input hash, no retention, no external calls). Prefer it over building your own EIP-1559 base fee math when you need a trustless, pay-per-use model with no API key signup.

## Known failure modes

- Invalid or missing current_base_fee_wei string may result in a computation error
- maximum_change_fraction outside expected range (e.g. negative or greater than 1/8 per EIP-1559) may yield unexpected bounds
- Malformed JSON input may cause a 400-level error
- Payment failure via x402 protocol may prevent the call from being processed

## 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 lower_wei and upper_wei bounds for the next EVM block's base fee, along with a status ('pass'), schema identifier, and evidence metadata confirming no data is retained and no external calls were made during computation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "current_base_fee_wei": {
   "type": "string",
   "maxLength": 8192,
   "description": "Current Base Fee Wei supplied to EVM Next Base Fee Bound; used only for this bounded calculation and processed in memory without retention."
  },
  "maximum_change_fraction": {
   "type": "number",
   "description": "Maximum Change Fraction supplied to EVM Next Base Fee Bound; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "lower_wei": "875000000",
   "upper_wei": "1125000000"
  },
  "schema": "delx/util-evm-next-base-fee-bound/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "bd788e10cae66dfcf807641601d7bf74d3bd4f11c95ecfe6477c865c191f130f",
   "external_calls": 0
  },
  "operation": "evm_preflight:evm_next_base_fee_bound"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-evm-next-base-fee-bound-d91f0dfa/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)