gapfill
Email authentication and deliverability check for a sending domain: SPF (redirects followed, recursive DNS lookup count against the limit of 10), DKIM across up to 30 common selectors (plus any you name) with RSA key size, DMARC policy and reporting (a subdomain inherits its parent's), MX, MTA-STS, TLS-RPT and BIMI. Every problem is named with a one-line fix, and an A–F grade lists each deduction. For deliverability audits and spoofing-risk checks. Live DNS over HTTPS.
SocialUnknowneip155:8453Exactvia cdp
EmailSpfDkimDmarcDeliverability
Settlements · 30d
17
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$0.07
Verified settled volume
17 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.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-26 10:38Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x91A71892231A256d69d4bf8a442234701a762AaFThe 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.
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 0x91A7…62AaF. The signed payment is good for 5 minutes.
- Paid to
- 0x91A7…62AaF
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x91A71892231A256d69d4bf8a442234701a762AaF",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"domain": "example.com"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"mx": {
"found": true,
"hosts": [
{
"host": "smtp.google.com",
"preference": 1
}
],
"null_mx": false
},
"spf": {
"found": true,
"issues": [],
"record": "v=spf1 include:_spf.google.com -all",
"mechanisms": [
"include:_spf.google.com",
"-all"
],
"all_qualifier": "-all",
"dns_lookup_count": 4
},
"bimi": {
"found": false,
"issues": [],
"record": null
},
"dkim": {
"found": true,
"issues": [],
"records": [
{
"issues": [],
"record": "v=DKIM1; k=rsa; p=MIIBIjAN...",
"key_type": "rsa",
"selector": "google",
"key_length_bits": 2048
}
],
"selectors_checked": [
"default",
"google"
],
"selectors_unknown": []
},
"dmarc": {
"pct": 100,
"rua": [
"mailto:dmarc@example.com"
],
"ruf": [],
"aspf": null,
"adkim": null,
"found": true,
"issues": [
"p=none only monitors: spoofed mail is still delivered"
],
"policy": "none",
"record": "v=DMARC1; p=none; rua=mailto:dmarc@example.com",
"inherited_from": null,
"subdomain_policy": null
},
"fixes": [
{
"fix": "change p=none to p=quarantine, then p=reject, at _dmarc.example.com once aggregate reports show all legitimate mail passing",
"issue": "p=none only monitors: spoofed mail is still delivered"
}
],
"grade": "B",
"notes": [],
"score": 85,
"domain": "example.com",
"mta_sts": {
"found": false,
"issues": [],
"record": null
},
"tls_rpt": {
"found": false,
"issues": [],
"record": null
},
"resolves": true,
"deductions": [
{
"points": 15,
"reason": "DMARC p=none"
}
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"domain"
],
"properties": {
"domain": {
"type": "string",
"description": "The sending domain (an email address or URL also works; a URL's leading www. is dropped)"
},
"dkimSelectors": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 4,
"description": "Extra DKIM selectors to check before the common ones (dkim_selectors also accepted)"
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"domain",
"grade",
"score",
"deductions",
"fixes",
"spf",
"dkim",
"dmarc",
"mx"
],
"properties": {
"mx": {
"type": "object"
},
"spf": {
"type": "object"
},
"bimi": {
"type": "object",
"description": "found is null when the lookup failed, with a lookup_failed issue naming the record"
},
"dkim": {
"type": "object",
"description": "selectors_unknown lists selectors whose lookup failed (a lookup_failed issue each); found is null when no key was found and some are unknown"
},
"dmarc": {
"type": "object",
"description": "inherited_from names the parent domain whose record applies when the domain has none"
},
"fixes": {
"type": "array",
"items": {
"type": "object",
"properties": {
"fix": {
"type": "string"
},
"issue": {
"type": "string"
}
}
},
"description": "Every issue in the report, each with a one-line fix"
},
"grade": {
"enum": [
"A",
"B",
"C",
"D",
"F"
],
"type": "string"
},
"notes": {
"type": "array",
"items": {
"type": "string"
},
"description": "How the input was read, when it was changed"
},
"score": {
"type": "integer",
"maximum": 100,
"minimum": 0
},
"domain": {
"type": "string"
},
"mta_sts": {
"type": "object",
"description": "found is null when the lookup failed, with a lookup_failed issue naming the record"
},
"tls_rpt": {
"type": "object",
"description": "found is null when the lookup failed, with a lookup_failed issue naming the record"
},
"resolves": {
"type": "boolean",
"description": "The domain has an A record or a mail server"
},
"deductions": {
"type": "array",
"items": {
"type": "object",
"properties": {
"points": {
"type": "integer"
},
"reason": {
"type": "string"
}
}
}
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-26 10:38Z
- Last indexed by Roundhouse
- 2026-10-26 22:40Z
- Last enriched (probe, favicon, geo)
- —
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- Not probed
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 gapfill 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=gapfill' 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://jotowl.com/v1/email/auth, 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. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.