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HALOWERK buerowerk — Email Suppression List Apply
x402
HALOWERK buerowerk — Email Suppression List Apply is a paid API for AI agents from buero.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-22).
Filters a list of emails against a suppression list and returns only the non-suppressed (sendable) emails
Price / call$0.004
Success—
StatusUnknown
How this service works
HALOWERK buerowerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.
Output
A JSON response containing the subset of input emails that are not present in the suppression list, effectively returning the safe-to-send addresses after applying suppression rules.
Example use cases
Pre-campaign suppression filtering
“Before I send out this week's marketing email, filter these 50 recipient emails against our suppression list so we don't accidentally email people who've opted out. Target list: [user1@example.com, user2@example.com, ...], suppression list: [optout1@example.com, optout2@example.com, ...].”
Unsubscribe compliance check
“I need to make sure we're GDPR-compliant — can you cross-check our outbound email list against our known unsubscribers and give me back only the addresses that are safe to contact?”
Automated drip campaign gating
“Our drip campaign is about to trigger for these leads. Run them against the suppression list first and only return the ones that aren't suppressed so we don't email people who've asked to be removed.”
Technical details
Endpoint
POSThttps://buero.halowerk.com/v1/baumarkt/mail/suppression-list-apply?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a simple, pay-per-call API to apply a suppression list to a batch of emails before sending — ideal for agents or automation workflows that manage email campaigns and need to filter out opted-out or blocked addresses without maintaining a full ESP subscription. Prefer this over building custom suppression logic or using heavyweight email platform APIs when you only need the filtering step.
Side effects
- Invalid email format in either list causing a validation error
- Empty emails array resulting in an empty or error response
- Malformed JSON body returning a 400 bad request
- Network timeout if either list is very large
- Payment failure via x402 protocol resulting in a 402 response before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| emails | — | |
| suppressed_emails | — |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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