{"id":"fe509c25-181f-4b13-8732-cf14071e7223","shortId":"4dwDPt","kind":"x402","title":"Email authentication/validation endpoint with x402 micropayment access.","tagline":"Email authentication/validation endpoint with x402 micropayment access.","description":"This endpoint at netintel-production-440c.up.railway.app/email-auth appears to provide email authentication or validation services, gated behind the x402 payment protocol. The endpoint is live and responds with an HTTP 402 status on POST requests, confirming it follows the x402 payment challenge pattern. However, the 402 challenge body returned is empty, meaning no pricing details, accepted tokens, or network information could be extracted from the probe.\n\nThe hosting provider is Railway, and the service name \"netintel\" suggests a network intelligence platform. The specific path \"/email-auth\" implies the endpoint performs some form of email-related verification — potentially checking email deliverability, domain authentication records (SPF/DKIM/DMARC), or validating whether an email address is legitimate. No documentation, OpenAPI spec, or README is available on the server; all common documentation paths return 404.\n\nDue to the empty x402 challenge and complete absence of documentation, the exact capabilities, request/response format, and pricing remain unknown. Users would need to experiment with the endpoint or contact the provider for integration details.","tags":[],"capabilities":["email-authentication","email-validation","x402-payment-gated","network-intelligence"],"categories":["email","security"],"synonyms":["email verification","email auth check","email deliverability","DKIM check","SPF validation","DMARC lookup","email reputation","netintel"],"warnings":["x402 challenge body is empty — no pricing, token, or network details available","No documentation found at any standard path (/docs, /api, /README, /pricing)","Request and response schemas are entirely unknown and inferred from the endpoint name","Root domain returns 404; no provider information available"],"endpointUrl":"https://netintel-production-440c.up.railway.app/email-auth","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xdaDc335482AD545296Fd7b28518A251fFCbEb9Df","amount":"4000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.150","qualityRationale":"The endpoint is live (402 on POST), but the x402 challenge body is empty, there is no documentation, no OpenAPI spec, no pricing info, and no response schema. Almost everything about this listing is inferred from the URL path name 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'402':44,59 '404':142 'DKIM check' 'DMARC lookup' 'SPF validation' 'absenc':151 'accept':69 'access':7,14 'address':123 'appear':21 'authent':25,115 'authentication/validation':2,9 'avail':133 'behind':30 'bodi':61 'capabl':156 'challeng':55,60,148 'check':111 'common':138 'complet':150 'confirm':49 'contact':172 'could':74 'deliver':113 'detail':68,177 'document':127,139,153 'domain':114 'due':143 'email':1,8,24,107,112,122 'email auth check' 'email deliverability' 'email reputation' 'email verification' 'email-authentication' 'email-rel':106 'email-validation' 'empti':64,146 'endpoint':3,10,16,36,101,170 'exact':155 'experi':167 'extract':76 'follow':51 'form':104 'format':158 'gate':29 'host':81 'howev':57 'http':43 'impli':99 'inform':73 'integr':176 'intellig':93 'legitim':125 'live':38 'mean':65 'micropay':6,13 'name':88 'need':165 'netintel':89 'netintel-production-440c.up.railway.app':19 'netintel-production-440c.up.railway.app/email-auth':18 'network':72,92 'network-intelligence' 'openapi':128 'path':97,140 'pattern':56 'payment':33,54 'perform':102 'platform':94 'post':47 'potenti':110 'price':67,160 'probe':79 'protocol':34 'provid':23,82,174 'railway':84 'readm':131 'record':116 'relat':108 'remain':161 'request':48 'request/response':157 'respond':40 'return':62,141 'server':136 'servic':28,87 'spec':129 'specif':96 'spf/dkim/dmarc':117 'status':45 'suggest':90 'token':70 'unknown':162 'user':163 'valid':27,119 'verif':109 'whether':120 'would':164 'x402':5,12,32,53,147 'x402-payment-gated'","prices":[{"id":"8a01548e-3aa7-49f1-a3d3-61035f18cbd9","listingId":"fe509c25-181f-4b13-8732-cf14071e7223","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0xdaDc335482AD545296Fd7b28518A251fFCbEb9Df","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xdaDc335482AD545296Fd7b28518A251fFCbEb9Df","amount":"4000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:37.792Z"}],"sources":[{"listingId":"fe509c25-181f-4b13-8732-cf14071e7223","source":"x402_bazaar","sourceId":"https://netintel-production-440c.up.railway.app/email-auth","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:37.792Z","lastSeenAt":"2026-04-22T05:32:30.126Z"}],"details":{"listingId":"fe509c25-181f-4b13-8732-cf14071e7223","quickStartSnippet":"curl -X POST https://netintel-production-440c.up.railway.app/email-auth \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"email\": \"user@example.com\"}'","exampleRequest":{"email":"user@example.com"},"exampleResponse":null,"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 on POST, confirming x402 protocol liveness","source_url":"https://netintel-production-440c.up.railway.app/email-auth"},{"claim":"All documentation paths (/docs, /api, /README, /pricing) return 404","source_url":"https://netintel-production-440c.up.railway.app/docs"}],"useCases":["Validate email addresses before sending marketing campaigns","Check email domain authentication records (SPF, DKIM, DMARC)","Verify email legitimacy to reduce fraud or bounce rates"],"bestFor":["Developers needing programmatic email validation via micropayments","Agents that need to verify email addresses on-the-fly","Services filtering out disposable or invalid email addresses"],"notFor":["Users who need detailed documentation or guaranteed SLAs","Bulk email list cleaning at scale (unknown rate limits and pricing)"],"kindDetails":{},"updatedAt":"2026-04-22T02:23:19.234Z"}}