# Delx EVM Replacement Fee Bump Checker

> Delx EVM Replacement Fee Bump Checker 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).

Calculates whether a proposed EVM transaction replacement fee is sufficient compared to the original fee, given a minimum bump fraction requirement.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/evm-replacement-fee-bump?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-evm-replacement-fee-bump-checker-67836874
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SKAtttgIyu7guWnapC6rj

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-evm-replacement-fee-bump-checker-67836874 -d '<json body>'
```

Example prompt: Check if a new fee of 1125000000 wei is a sufficient replacement bump over an old fee of 1000000000 wei, using a minimum bump fraction of 0.1.

## When to prefer this

Use this endpoint when an AI agent or DeFi bot needs to programmatically determine whether a replacement EVM transaction fee satisfies the network's minimum bump requirement before broadcasting. Ideal for pre-flight checks in transaction management workflows, particularly when handling stuck or time-sensitive transactions. Prefer over manual calculation when verifiable, auditable results (with input hash and no-retention guarantee) are needed.

## Known failure modes

- Missing required fields (new_fee_wei, old_fee_wei, minimum_bump_fraction) result in validation error
- Non-numeric or malformed wei strings may cause parsing errors
- Negative or zero fee values may produce unexpected computation results
- Payment failure via x402 if USDC balance is insufficient

## 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 indicating whether the proposed fee represents a sufficient bump (sufficient_bump boolean), along with the proposed fee in wei and the minimum required fee in wei to satisfy the bump fraction. Also includes an evidence block confirming no data retention and an input hash for verifiability.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "new_fee_wei": {
   "type": "string",
   "maxLength": 8192,
   "description": "New Fee Wei supplied to EVM Replacement Fee Bump; used only for this bounded calculation and processed in memory without retention."
  },
  "old_fee_wei": {
   "type": "string",
   "maxLength": 8192,
   "description": "Old Fee Wei supplied to EVM Replacement Fee Bump; used only for this bounded calculation and processed in memory without retention."
  },
  "minimum_bump_fraction": {
   "type": "number",
   "description": "Minimum Bump Fraction supplied to EVM Replacement Fee Bump; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "sufficient_bump": true,
   "proposed_fee_wei": "1125000000",
   "required_fee_wei": "1100000000"
  },
  "schema": "delx/util-evm-replacement-fee-bump/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "e26aad7e3411d7e56c828277122462cfbb1e33dd33e02d2a4747677195dc32fb",
   "external_calls": 0
  },
  "operation": "evm_preflight:evm_replacement_fee_bump"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-evm-replacement-fee-bump-checker-67836874/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)