Email Deliverability Check
Professor Sausages
SocialLiveeip155:8453Exactvia cdp
EmailDeliverabilityVerificationMx-spf-dmarcDisposable
Settlements · 30d
118↑ 538%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$4.32
Verified settled volume
328 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-07-21 01:58Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x54ebFCF3870439B9db62381848c5DabC05c70d5BThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x54ebFCF3870439B9db62381848c5DabC05c70d5B",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://x402.professorsausages.com/email-check/check",
"tags": [
"email",
"deliverability",
"verification",
"mx-spf-dmarc",
"disposable"
],
"mimeType": "application/json",
"description": "Email deliverability-signals check — RFC5322 syntax + live MX/SPF/DMARC (DoH) + disposable/role/free-provider/unicode flags. Signals, not an SMTP guarantee",
"serviceName": "Email Deliverability Check"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"email": "The email address to check (≤320 chars)."
}
},
"output": {
"type": "object",
"required": [
"email",
"normalized_email",
"has_plus_tag",
"domain",
"verdict",
"evidence",
"checks_run",
"not_checked",
"disclaimer",
"freshness"
],
"properties": {
"email": {
"type": "string"
},
"domain": {
"type": [
"string",
"null"
],
"description": "Domain part (null when syntax invalid)."
},
"verdict": {
"enum": [
"DELIVERABLE_SIGNALS_OK",
"RISKY",
"UNDELIVERABLE"
],
"type": "string",
"description": "Signals read, NOT a delivery guarantee. UNDELIVERABLE = syntax fail or no MX; RISKY = disposable, unicode-lookalike, or no SPF + no DMARC; else DELIVERABLE_SIGNALS_OK."
},
"evidence": {
"type": "array",
"items": {
"type": "object",
"required": [
"check",
"signal",
"detail"
],
"properties": {
"check": {
"type": "string",
"description": "Stable check id."
},
"detail": {
"type": "string"
},
"signal": {
"enum": [
"ok",
"info",
"warn",
"critical",
"unknown"
],
"type": "string",
"description": "\"unknown\" means the check degraded (e.g. DoH outage) and did not produce a signal."
}
}
}
},
"freshness": {
"type": "object",
"required": [
"tier",
"max_age_seconds",
"as_of"
],
"properties": {
"tier": {
"enum": [
"live"
],
"type": "string"
},
"as_of": {
"type": "string",
"description": "ISO-8601 timestamp of this live check."
},
"max_age_seconds": {
"enum": [
0
],
"type": "integer"
}
}
},
"checks_run": {
"type": "array",
"items": {
"type": "string"
}
},
"disclaimer": {
"type": "string"
},
"not_checked": {
"type": "array",
"items": {
"type": "string"
},
"description": "smtp_handshake, mailbox_existence, reputation_feeds — plus any DoH-degraded checks."
},
"has_plus_tag": {
"type": "boolean"
},
"normalized_email": {
"type": "string",
"description": "Lowercased; gmail dots + plus-tag stripped."
}
}
}
},
"schema": {
"type": "object",
"required": [
"input"
],
"properties": {
"input": {
"type": "object"
},
"output": {
"type": "object"
}
}
},
"category": "verification",
"routeTemplate": "https://x402.professorsausages.com/email-check/check"
},
"sample": {
"url": "https://x402.professorsausages.com/email-check/sample",
"hint": "A real cached response from this API (with its capture timestamp), free — judge the data quality before paying."
},
"catalog": {
"message": "This endpoint is 1 of 29 pay-per-call APIs for agents — all same x402 payment + auth. Browse the full menu free (no payment) at the catalog URL; every API serves a free real sample record at /<api>/sample.",
"strategy": "minimal",
"catalogUrl": "https://x402.professorsausages.com/?ref=402&v=minimal&from=email-check"
},
"suggest": {
"url": "https://x402.professorsausages.com/suggest",
"hint": "Missing data you'd pay for? POST {want, would_pay_usd} — free. The most-requested datasets get built first."
},
"discount": {
"off": "50%",
"hint": "Send X-Intent: <40+ chars describing what you're building and what data you need> for 50% off this call.",
"header": "X-Intent"
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.002USDC≈ $0.002 USD
on Base · exact scheme
Pay 0.002 USDC on Base to 0x54eb…70d5B. The signed payment is good for 1 minute.
- Paid to
- 0x54eb…70d5B
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x54ebFCF3870439B9db62381848c5DabC05c70d5B",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"email": "The email address to check (≤320 chars)."
}
},
"output": {
"type": "object",
"required": [
"email",
"normalized_email",
"has_plus_tag",
"domain",
"verdict",
"evidence",
"checks_run",
"not_checked",
"disclaimer",
"freshness"
],
"properties": {
"email": {
"type": "string"
},
"domain": {
"type": [
"string",
"null"
],
"description": "Domain part (null when syntax invalid)."
},
"verdict": {
"enum": [
"DELIVERABLE_SIGNALS_OK",
"RISKY",
"UNDELIVERABLE"
],
"type": "string",
"description": "Signals read, NOT a delivery guarantee. UNDELIVERABLE = syntax fail or no MX; RISKY = disposable, unicode-lookalike, or no SPF + no DMARC; else DELIVERABLE_SIGNALS_OK."
},
"evidence": {
"type": "array",
"items": {
"type": "object",
"required": [
"check",
"signal",
"detail"
],
"properties": {
"check": {
"type": "string",
"description": "Stable check id."
},
"detail": {
"type": "string"
},
"signal": {
"enum": [
"ok",
"info",
"warn",
"critical",
"unknown"
],
"type": "string",
"description": "\"unknown\" means the check degraded (e.g. DoH outage) and did not produce a signal."
}
}
}
},
"freshness": {
"type": "object",
"required": [
"tier",
"max_age_seconds",
"as_of"
],
"properties": {
"tier": {
"enum": [
"live"
],
"type": "string"
},
"as_of": {
"type": "string",
"description": "ISO-8601 timestamp of this live check."
},
"max_age_seconds": {
"enum": [
0
],
"type": "integer"
}
}
},
"checks_run": {
"type": "array",
"items": {
"type": "string"
}
},
"disclaimer": {
"type": "string"
},
"not_checked": {
"type": "array",
"items": {
"type": "string"
},
"description": "smtp_handshake, mailbox_existence, reputation_feeds — plus any DoH-degraded checks."
},
"has_plus_tag": {
"type": "boolean"
},
"normalized_email": {
"type": "string",
"description": "Lowercased; gmail dots + plus-tag stripped."
}
}
}
},
"schema": {
"type": "object",
"required": [
"input"
],
"properties": {
"input": {
"type": "object"
},
"output": {
"type": "object"
}
}
},
"category": "verification",
"routeTemplate": "https://x402.professorsausages.com/email-check/check"
},
"sample": {
"url": "https://x402.professorsausages.com/email-check/sample",
"hint": "A real cached response from this API (with its capture timestamp), free — judge the data quality before paying."
},
"catalog": {
"message": "You called Email Deliverability Check. Agents doing verification work commonly also use these — same pay-per-call model, each with a FREE real sample record (freeSample link):",
"related": [
{
"call": "/domain-intel?ref=xsell&v=related&from=email-check",
"name": "Domain Intel (RDAP + DNS)",
"summary": "Domain registration truth + DNS posture for agents, pay-per-check — part of the Trust & Verification suite…",
"freeSample": "/domain-intel/sample?ref=xsell&v=related&from=email-check"
},
{
"call": "/url-screen?ref=xsell&v=related&from=email-check",
"name": "Malicious URL Screen",
"summary": "Phishing & malicious-URL screening for agents — hand over any http(s) URL and get a structured risk verdict…",
"freeSample": "/url-screen/sample?ref=xsell&v=related&from=email-check"
},
{
"call": "/phone-check?ref=xsell&v=related&from=email-check",
"name": "Phone Number Validation",
"summary": "Phone-number validation for agents — is this number real, what region and line type, and its canonical E.16…",
"freeSample": "/phone-check/sample?ref=xsell&v=related&from=email-check"
}
],
"strategy": "related",
"catalogUrl": "https://x402.professorsausages.com/?ref=402&v=related&from=email-check"
},
"suggest": {
"url": "https://x402.professorsausages.com/suggest",
"hint": "Missing data you'd pay for? POST {want, would_pay_usd} — free. The most-requested datasets get built first."
},
"discount": {
"off": "50%",
"hint": "Send X-Intent: <40+ chars describing what you're building and what data you need> for 50% off this call.",
"header": "X-Intent"
}
}Provenance
- Seen in the source catalog
- 2026-07-21 01:58Z
- Last indexed by Roundhouse
- 2026-07-23 06:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-10 11:45Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 400
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Email Deliverability Check and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Email%20Deliverability%20Check' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://x402.professorsausages.com/email-check/check, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.