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Email Plus-Tag Rejection Checker
x402
Email Plus-Tag Rejection Checker is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).
Checks whether an email address would be rejected specifically because its local part contains a plus tag (e.g. user+tag@example.com).
Price / call$0.01
Success—
StatusUnknown
How this service works
Call when an agent needs whether an email is rejected because the local part contains a plus tag. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/check-email-plus-reject first.
Output
Returns a boolean or status indicating whether the email address is rejected specifically because its local part contains a plus tag, helping distinguish plus-tag-related rejections from other email validation failures.
Example use cases
Sign-up form email filter audit
“We're seeing some user registrations fail — can you check whether 'john+promo@company.com' is getting rejected because of the plus tag in the email address?”
Email alias compatibility check
“I want to know if 'me+spam@gmail.com' would be flagged and rejected purely because of the plus sign before I use it to sign up for a service.”
Automated form validation pipeline
“Run a check on 'support+ticket42@helpdesk.org' and tell me if the rejection is due to the plus tag in the local part of the email.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/check-email-plus-reject?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to specifically isolate whether email rejection is caused by a plus tag (subaddress) in the local part, rather than other syntax errors. Prefer the free sandbox endpoint POST /v1/sandbox/check-email-plus-reject first; fall back to this paid endpoint when the sandbox is unavailable or rate-limited.
Side effects
- Empty or missing input value returns validation error
- Input exceeding 20000 characters rejected
- Malformed JSON body causes 400 error
- Network timeout or service unavailability returns 5xx
- Ambiguous result if input is not a recognizable email string
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | — | JSON value for schema-check SKUs. Omit it on string checks such as email or IBAN. |
| value | string | Value to check. The route description names the format: email, phone, IBAN, postal code, VAT, national id, or similar. |
| schema | — | JSON Schema document for schema-check SKUs. Omit it on string checks. |
Tags
x402
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