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Delx EVM Replacement Fee Bump
x402
Delx EVM Replacement Fee Bump is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Checks whether a new EVM transaction fee (in wei) represents a sufficient bump over the old fee, given a minimum bump fraction threshold.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Replacement Fee Bump: EVM Replacement Fee Bump checks proposed fee caps against a required replacement bump from bounded caller-supplied values without an external provider. Call EVM Replacement Fee Bump before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Replacement Fee Bump as versioned deterministic JSON. Price:…
Output
Returns a JSON object indicating whether the proposed fee bump is sufficient (sufficient_bump boolean), the proposed fee in wei, and the minimum required fee in wei to satisfy the bump fraction. Also includes audit evidence: input hash, retention status, and external call count.
Example use cases
Stuck transaction fee replacement check
“I have a pending Ethereum transaction with an old fee of 1000000000 wei and I want to replace it with 1125000000 wei — does that meet a minimum bump fraction of 0.1?”
RBF preflight before rebroadcast
“Before I rebroadcast my transaction, verify whether raising the fee from 900000000 wei to 1000000000 wei is sufficient given a 0.12 minimum bump fraction.”
Automated gas bumping agent validation
“My agent is trying to speed up a stuck transaction — old fee is 2000000000 wei, proposed new fee is 2200000000 wei, minimum bump fraction is 0.1. Is the bump large enough to qualify as a replacement?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-replacement-fee-bumpWhen to prefer
Use this endpoint when an AI agent needs to programmatically verify that a replacement EVM transaction fee satisfies the network's replace-by-fee (RBF) minimum bump requirement before rebroadcasting. It is purpose-built for EVM fee bump preflight checks and returns structured, auditable results with no data retention — ideal for automated blockchain transaction management workflows.
Side effects
- Missing required fields (new_fee_wei, old_fee_wei, or minimum_bump_fraction) may cause a 400 error
- Non-numeric or non-string wei values may cause parsing errors
- minimum_bump_fraction of 0 or negative values may produce unexpected results
- Extremely large wei strings beyond practical EVM values may be rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| new_fee_wei | string | New Fee Wei supplied to EVM Replacement Fee Bump; used only for this bounded calculation and processed in memory without retention. |
| old_fee_wei | string | Old Fee Wei supplied to EVM Replacement Fee Bump; used only for this bounded calculation and processed in memory without retention. |
| minimum_bump_fraction | number | Minimum Bump Fraction supplied to EVM Replacement Fee Bump; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"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"
}
}Tags
x402
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