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is-email-hosted-by-fastmail-bulk
x402
is-email-hosted-by-fastmail-bulk is a paid API for AI agents from email.intel.rallylive.ca, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-24).
Checks whether up to 20 domains' email is hosted by Fastmail in a single concurrent batch call, returning one result per domain with per-item error fields and a failure count.
Price / call$0.1
Success—
StatusUnknown
How this service works
Bulk is email hosted by fastmail: up to 20 domains in one call, processed concurrently, results in input order with a per-item error field and a failure count. Same answer per item as the single endpoint. Batch enrichment for agents that hold a list. $0.10 per batch.
Output
An ordered array of results matching the input domain list, each containing a boolean indicating whether that domain's email is hosted by Fastmail, a per-item error field if the lookup failed, and a summary failure count for the entire batch.
Example use cases
Prospect list email stack enrichment
“I have a list of 18 SaaS company domains and I want to know which of them are using Fastmail to host their email — can you run them all through at once and give me the results?”
CRM data enrichment pipeline
“Before we import these 20 leads into the CRM, check each domain to see if they're on Fastmail email hosting so we can tag them accordingly.”
Competitor tech-stack research
“We think several of our competitors use Fastmail — can you batch-check these 12 domains and tell me which ones are actually Fastmail-hosted, and flag any that errored out?”
Technical details
Endpoint
GEThttps://email.intel.rallylive.ca/bulk/email/hosted-by/fastmail?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have a list of 2–20 domains and need to check Fastmail hosting status for all of them efficiently in one call rather than making separate single-domain requests. It is preferable to the single endpoint whenever you're doing bulk enrichment, processing lead lists, or building data pipelines that require concurrent lookups with ordered, per-item results.
Side effects
- Individual domain DNS lookup failures captured in per-item error field without failing the whole batch
- Exceeding the 20-domain limit may result in rejection or partial processing
- Malformed domain inputs may trigger per-item errors
- Network timeout on DNS resolution for specific domains
- Service unavailability returning a top-level error for the entire batch
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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