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SMTP Envelope Transaction Command Sequencing Validator
x402
SMTP Envelope Transaction Command Sequencing Validator is a paid API for AI agents from detect.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-11-04).
Validates whether a normalized SMTP command ledger respects envelope sequencing rules and correctly resets transaction state after a rejected end-of-DATA command.
Price / call$0.003
Success—
StatusUnknown
How this service works
An offline SMTP client test agent needs whether a normalized command ledger respects envelope sequencing and whether a rejected end-of-DATA still resets the transaction before the next MAIL, without sending mail or exposing contacts.
Output
Returns a conformance verdict indicating whether the supplied SMTP command event sequence respects envelope sequencing rules, whether a rejected end-of-DATA correctly triggers a transaction reset, and a check against the supplied claim value — all without sending actual email or exposing any contact information.
Example use cases
SMTP client protocol conformance testing
“I'm building an offline SMTP client and need to verify that this sequence of commands — EHLO, MAIL FROM, RCPT TO, DATA rejected with 554, then another MAIL FROM — correctly resets the transaction state. Can you validate the envelope sequencing for me? The claim value is 42 and the events are [{"op":"EHLO","outcome":"250"},{"op":"MAIL FROM","outcome":"250"},{"op":"RCPT TO","outcome":"250"},{"op":"DATA","outcome":"554"},{"op":"MAIL FROM","outcome":"250"}].”
Rejected DATA transaction reset verification
“After a DATA command gets rejected with a 550 error in my SMTP trace, does the server correctly reset the transaction envelope before accepting the next MAIL FROM? Here's my command ledger with claim 100: [{"op":"MAIL FROM","outcome":"250"},{"op":"RCPT TO","outcome":"250"},{"op":"DATA","outcome":"550"},{"op":"MAIL FROM","outcome":"250"}].”
SMTP envelope ordering rule compliance check
“Can you check whether this SMTP command sequence has correct envelope ordering — specifically that MAIL FROM comes before RCPT TO and DATA — using claim value 7 and these events: [{"op":"EHLO","outcome":"250"},{"op":"RCPT TO","outcome":"503"},{"op":"MAIL FROM","outcome":"250"},{"op":"RCPT TO","outcome":"250"},{"op":"DATA","outcome":"250"}]?”
Technical details
Endpoint
POSThttps://detect.halowerk.com/v1/F-A-NIGHT-PROTOCOL-SMTP/smtp-envelope-transaction-command-sequencing?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need offline, side-effect-free SMTP protocol conformance testing — specifically to verify envelope command ordering and post-rejection transaction reset behavior without sending any mail or touching real SMTP infrastructure. Prefer this over live SMTP testing tools when privacy, reproducibility, or no-send guarantees are required.
Side effects
- Malformed smtp_envelope object missing required claim or events fields returns a 400 validation error
- Events array exceeding 512 items is rejected
- Individual op or outcome strings exceeding 1024 characters are rejected
- Claim value outside the range -1000000000000 to 1000000000000 is rejected
- Empty events array may produce inconclusive sequencing result
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| artifact | object |
Tags
x402
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