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EVM Finality Depth Check
x402
EVM Finality Depth Check 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 transaction has reached finality on an EVM chain by comparing current block height, inclusion block, and required confirmation depth.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Finality Depth Check: EVM Finality Depth Check checks confirmation count against a caller-required depth from bounded caller-supplied values without an external provider. Call EVM Finality Depth Check 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 Finality Depth Check as versioned deterministic JSON. Price: $0…
Output
Returns a JSON object indicating whether the transaction is final (boolean), the computed number of confirmations (current_block minus inclusion_block), the required confirmations threshold, a pass/fail status, and an evidence object confirming no data was retained and no external calls were made. The schema identifier is delx/util-evm-finality-depth-check/v1.
Example use cases
Deposit crediting preflight check
“Before I credit the user's deposit, verify that the transaction included at block 19200000 has reached finality — the chain is now at block 19200015 and I require 12 confirmations.”
Cross-chain bridge settlement gate
“We're at block 18750030 and the bridge lock transaction was included at block 18750018 — check if it has the required 10 confirmations before we release funds on the destination chain.”
NFT mint confirmation gating
“The NFT mint was included at block 20100005, the current block is 20100008, and we need at least 6 confirmations — is it finalized yet?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-finality-depth-checkWhen to prefer
Use this endpoint when an AI agent needs a lightweight, stateless, in-memory computation to determine EVM transaction finality without making any external blockchain RPC calls. Prefer this over full on-chain queries when you already have block numbers from a prior lookup and just need the finality arithmetic and a structured pass/fail verdict — especially in automated workflows where a consistent schema and audit evidence trail are required.
Side effects
- Missing required fields (current_block, inclusion_block, or required_confirmations) will result in a validation error
- Non-integer or negative block values may cause a computation error
- If current_block is less than inclusion_block, confirmations will be zero or negative, resulting in final=false
- Network or server errors may return a 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| current_block | integer | Current Block supplied to EVM Finality Depth Check; used only for this bounded calculation and processed in memory without retention. |
| inclusion_block | integer | Inclusion Block supplied to EVM Finality Depth Check; used only for this bounded calculation and processed in memory without retention. |
| required_confirmations | integer | Required Confirmations supplied to EVM Finality Depth Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"final": true,
"confirmations": 13,
"required_confirmations": 10
},
"schema": "delx/util-evm-finality-depth-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "a22f206fc93ec7aa456682a387c45bab6f2594ad1220aa7f26d7561636798f44",
"external_calls": 0
},
"operation": "evm_preflight:evm_finality_depth_check"
}
}Tags
x402
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