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Delx EVM Blob Fee Budget
x402
Delx EVM Blob Fee Budget 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).
Computes the total blob fee ceiling in wei given blob gas and max fee per blob gas, enabling EVM preflight cost checks without external calls.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Blob Fee Budget: EVM Blob Fee Budget calculates a worst-case blob fee from blob gas and fee cap from bounded caller-supplied values without an external provider. Call EVM Blob Fee Budget 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 Blob Fee Budget as versioned deterministic JSON. Price: $0.001 USDC via x402…
Output
Returns a JSON object containing the computed blob_fee_ceiling_wei (the maximum blob fee in wei), along with operation metadata including schema version, status, evidence of no data retention, input hash, and zero external calls made.
Example use cases
EIP-4844 transaction preflight cost check
“I'm about to post a blob transaction with 131072 blob gas and a max fee per blob gas of 1 wei — what's the blob fee ceiling in wei so I know if my budget covers it?”
Layer-2 rollup blob submission budgeting
“My rollup agent is about to submit calldata as blobs. Given blob gas of 262144 and max fee per blob gas of 2 wei, compute the blob fee ceiling in wei so I can decide whether to proceed.”
Gas cost validation before batch blob post
“Check the blob fee ceiling for a transaction with blob gas of 65536 and max fee per blob gas of 3 wei — I need to verify it stays under my fee limit before batching the blobs.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-blob-fee-budgetWhen to prefer
Choose this endpoint when an AI agent needs a fast, stateless, auditable computation of the EVM blob fee ceiling in wei before submitting an EIP-4844 blob transaction. It performs no external calls and retains no input data, making it ideal for preflight cost checks in automated blockchain workflows where privacy and determinism matter.
Side effects
- Missing or invalid blob_gas integer causes validation error
- max_fee_per_blob_gas_wei exceeds maxLength of 8192 characters
- Non-numeric string passed for max_fee_per_blob_gas_wei
- Integer overflow if extremely large blob_gas or fee values are provided
- Malformed JSON body returns 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| blob_gas | integer | Blob Gas supplied to EVM Blob Fee Budget; used only for this bounded calculation and processed in memory without retention. |
| max_fee_per_blob_gas_wei | string | Max Fee Per Blob Gas Wei supplied to EVM Blob Fee Budget; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"blob_fee_ceiling_wei": "262144"
},
"schema": "delx/util-evm-blob-fee-budget/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "452aa5227d3b7d47a78b8729ad6d09af441ba3bf8df5aa35b34a7f7e8c38965f",
"external_calls": 0
},
"operation": "evm_preflight:evm_blob_fee_budget"
}
}Tags
x402
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