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Delx Commerce — EVM Transaction Envelope Check
x402
Delx Commerce — EVM Transaction Envelope Check is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Validates EVM transaction envelope fields for a given transaction type, returning required fields, missing fields, and pass/fail status.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object with a pass/fail status, a boolean valid flag, a list of required fields for the given transaction type, a list of any missing fields, the detected transaction type, and evidence metadata including a SHA-256 hash of the input and confirmation that no data is retained externally.
Example use cases
Preflight EIP-1559 transaction before broadcast
“Before I submit this EIP-1559 transaction, check the envelope for me — it's transaction type 2 with fields nonce, chainId, maxFeePerGas, maxPriorityFeePerGas, and to — and let me know if any required fields are missing.”
Debug a failing agent-constructed transaction
“My agent built an EVM transaction but it keeps failing. Can you run an envelope check on transaction type 2 with fields chainId and nonce only, and tell me what's missing?”
Validate transaction envelope in automated signing pipeline
“As part of my signing pipeline, validate this EVM transaction type 0 envelope with fields gasPrice, nonce, to, value, and data to confirm all required fields are present before we sign and broadcast.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/evm-tx-envelope-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, cheap, no-signup preflight check to validate an EVM transaction envelope before signing or broadcasting — especially when you want verifiable, in-memory-only processing with a cryptographic hash of the input for audit purposes. Prefer it over manual field checks or full RPC simulation when you only need field completeness validation for a known transaction type.
Side effects
- Invalid or unsupported transaction_type integer returns an error or unexpected required_fields list
- Malformed fields object with non-object values may cause validation errors
- Missing fields object causes incomplete validation results
- Payment failure via x402 (insufficient USDC balance or unsupported chain) prevents the call from completing
- Network timeout returns no validation result
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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