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Delx EVM Transaction Envelope Check
x402
Delx EVM Transaction Envelope Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Validates an EVM transaction envelope by checking that all required fields are present for a given transaction type and returns missing or required field lists.
Price / call$0.001
Success—
StatusUnknown
How this service works
EVM Tx Envelope Check: EVM Tx Envelope Check checks required envelope fields for a declared transaction type from bounded caller-supplied values without an external provider. Call EVM Tx Envelope 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 Tx Envelope Check as versioned deterministic JSON. Price: $0.001 U…
Output
Returns a JSON object with a 'valid' boolean, a list of 'missing_fields', the full list of 'required_fields' for the given transaction type, the detected 'transaction_type', a status string ('pass' or 'fail'), and evidence metadata including whether input was retained and how many external calls were made.
Example use cases
Preflight before broadcasting EIP-1559 transaction
“Before I send this EIP-1559 transaction to the network, can you run a preflight check on my type 2 transaction envelope and tell me if all required fields like chainId, maxFeePerGas, and maxPriorityFeePerGas are present?”
Debugging a rejected transaction submission
“My transaction keeps getting rejected — can you validate my EVM transaction envelope fields for a type 0 legacy transaction and show me exactly which required fields I'm missing?”
Agent wallet transaction safety check
“Before my agent signs and submits any EVM transaction, run an envelope check on the transaction object to make sure all required fields are in place — it's a type 2 transaction with chainId, nonce, and gas fields included.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/evm-tx-envelope-checkWhen to prefer
Choose this endpoint when you need a fast, stateless, in-memory preflight check that your EVM transaction envelope contains all required fields before signing or broadcasting — especially useful in agent workflows to prevent wasted gas or failed submissions. Prefer it over manual field checks when building automated transaction pipelines that must validate type 2 (EIP-1559) or other typed transactions programmatically.
Side effects
- Missing or malformed 'fields' object results in validation error
- Invalid or unsupported 'transaction_type' integer may return unknown type error
- Supplying more than 128 properties in fields object violates maxProperties constraint
- Malformed JSON body returns 400-level parse error
- Network or service unavailability returns 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| fields | object | Fields supplied to EVM Tx Envelope Check; used only for this bounded calculation and processed in memory without retention. |
| transaction_type | integer | Transaction Type supplied to EVM Tx Envelope Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"valid": true,
"missing_fields": [],
"required_fields": [
"chainId",
"maxFeePerGas",
"maxPriorityFeePerGas",
"nonce"
],
"transaction_type": 2
},
"schema": "delx/util-evm-tx-envelope-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "847b54b0f549ee1ab246ef64c6b6670897f880fa285f91e0f08548bfdd9814d7",
"external_calls": 0
},
"operation": "evm_preflight:evm_tx_envelope_check"
}
}Tags
x402
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