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Delx Base Gas Price Staleness Check
x402
Delx Base Gas Price Staleness 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).
Determines whether a previously quoted Base (L2) gas price is still fresh by comparing its age against a maximum allowed staleness threshold.
Price / call$0.001
Success—
StatusUnknown
How this service works
Base Gas Price Staleness: Base Gas Price Staleness checks the age of a caller-supplied gas quote before use from bounded caller-supplied values without an external provider. Call Base Gas Price Staleness 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 Base Gas Price Staleness as versioned deterministic JSON. Price: $0.…
Output
Returns a JSON object indicating whether the gas price quote is fresh (boolean), how many seconds old it is (age_seconds), an overall pass/fail status, and an evidence block confirming no data was retained and no external calls were made. The operation field identifies this as an EVM preflight staleness check.
Example use cases
Pre-transaction gas validity check
“Before I submit this Base network transaction, check if the gas price I fetched at epoch 1710005000 is still valid — current time is epoch 1710005080 and I want to reject anything older than 60 seconds.”
DeFi bot preflight freshness gate
“My trading bot cached a gas price at epoch 1710010000 and it's now epoch 1710010200 — tell me if that quote is still within my 150-second freshness window before I place the order.”
Agent workflow staleness guard
“I'm about to batch-submit EVM transactions and my gas price was quoted at epoch 1709999900; current epoch is 1710000000 and my policy is a 90-second max age — is the quote still fresh or do I need to re-fetch it?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/base-gas-price-stalenessWhen to prefer
Use this endpoint when your agent needs a deterministic, in-memory, zero-side-effect staleness gate before submitting EVM transactions on Base L2. Prefer it over rolling your own timestamp arithmetic when you need a traceable evidence receipt (input SHA-256, retained:false, external_calls:0) for auditability in automated blockchain workflows.
Side effects
- Missing required fields (now_epoch, quoted_at_epoch, or maximum_age_seconds) result in a validation error
- Negative age if now_epoch is before quoted_at_epoch — may return an error or unexpected result
- Non-integer epoch values cause schema validation failure
- Payment failure (insufficient USDC balance) blocks the call with a 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| now_epoch | integer | Now Epoch supplied to Base Gas Price Staleness; used only for this bounded calculation and processed in memory without retention. |
| quoted_at_epoch | integer | Quoted At Epoch supplied to Base Gas Price Staleness; used only for this bounded calculation and processed in memory without retention. |
| maximum_age_seconds | integer | Maximum Age Seconds supplied to Base Gas Price Staleness; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"fresh": true,
"age_seconds": 60
},
"schema": "delx/util-base-gas-price-staleness/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "71423649bb9f78764df45bb5a8b4de2c13085d598094d66b005c77f6181eac9f",
"external_calls": 0
},
"operation": "evm_preflight:base_gas_price_staleness"
}
}Tags
x402
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