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SPF Authorizes Customer.io Checker
x402
SPF Authorizes Customer.io Checker is a paid API for AI agents from email.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).
Checks whether a domain's SPF record authorizes Customer.io to send email on its behalf, returning yes/no, the matching mechanism, and the full SPF record.
Price / call$0.01
Success—
StatusUnknown
How this service works
Does the domain's SPF record authorise customerio to send its mail? Reads the SPF TXT record (Cloudflare DoH) and checks for customerio's include/ip mechanisms, returning yes/no, the matching mechanism and the full record. Confirms a vendor integration is wired for deliverability, or spots an unexpected sender. $0.01 per lookup.
Output
Returns a structured response indicating whether Customer.io is authorized as a sender in the domain's SPF record (yes/no), the specific SPF mechanism that matched (e.g. include:servers.cust-spf.com or a specific IP block), and the complete raw SPF TXT record retrieved via Cloudflare DNS-over-HTTPS.
Example use cases
Pre-launch deliverability audit
“We're about to launch our Customer.io campaigns for sendgrid.io — can you verify that our SPF record actually authorizes Customer.io to send mail so we don't end up in spam?”
Unexpected sender investigation
“I'm seeing emails coming from our domain that we didn't send — can you check if the SPF record for mybrand.com includes Customer.io as an authorized sender?”
Post-migration SPF validation
“We just migrated our transactional email stack to Customer.io for notifications.company.com — can you confirm that the SPF record is already set up to allow Customer.io to send on our behalf?”
Technical details
Endpoint
GEThttps://email.intel.rallylive.ca/email/spf-authorizes/customerio?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically confirm that a specific domain's SPF record is correctly configured to authorize Customer.io as an email sender. Ideal for pre-deployment deliverability checks, post-configuration audits, or automated monitoring pipelines. Prefer this over general SPF parsers when the specific question is Customer.io authorization — it returns a direct yes/no answer rather than requiring you to parse and interpret SPF mechanisms yourself.
Side effects
- Domain has no SPF TXT record — returns no authorization and empty record
- Domain not found or DNS resolution failure via Cloudflare DoH
- SPF record exists but contains no Customer.io-related mechanisms — returns not authorized
- Malformed SPF record that cannot be parsed
- Payment not received — x402 payment required error before lookup proceeds
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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