{"uid":"cap_Hr5b50TDVjjgGVN13FUz7","slug":"spamrats-noptr-dnsbl-lookup-88b3f6f7","name":"SpamRATS NOPTR DNSBL Lookup","description":"Is this IPv4 address listed on spamrats noptr (noptr.spamrats.com)? Performs the DNSBL query (reversed octets under noptr.spamrats.com, via Cloudflare DoH) and returns listed yes/no with the return codes and, where the list publishes one, the reason text. One list, one precise answer. $0.01 per lookup.","url":"https://ip.intel.rallylive.ca/ip/blacklist/spamrats-noptr?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_SkcUJkyNkPsWs6viUKA30","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether a given IPv4 address is listed on the SpamRATS NOPTR blacklist (noptr.spamrats.com) via DNS-based lookup and returns listed status, return codes, and reason text.","exampleAgentPrompt":"Can you check if the IP address 203.0.113.42 is listed on the SpamRATS NOPTR blacklist and tell me the return code and any reason given?","exampleUseCases":[{"title":"Email server IP reputation check","prompt":"Before I send emails from 198.51.100.77, can you check if it's listed on the SpamRATS NOPTR blacklist? I want to know if it's flagged and why."},{"title":"Incoming connection spam screening","prompt":"This IP 203.0.113.15 just tried to connect to our mail server — is it on the SpamRATS NOPTR blacklist? Give me the listed status and any return codes."},{"title":"IP deliverability audit","prompt":"I'm auditing our sending IPs for deliverability issues. Can you check whether 192.0.2.88 appears on the SpamRATS NOPTR DNSBL and what reason code it has?"}],"resultDescription":"Returns a yes/no listed status indicating whether the IPv4 address appears on the SpamRATS NOPTR blacklist, along with the DNSBL return codes and, where published by the list, the human-readable reason text explaining why the IP is listed.","failureModes":["Invalid or non-IPv4 address input returns an error","DNS resolution failure via Cloudflare DoH results in an error or indeterminate response","IP not listed returns listed: false with no reason text","Transient network issues may cause lookup timeouts"],"whenToPreferThis":"Use this endpoint when you need a precise, single-list check specifically against SpamRATS NOPTR (targeting IPs with no PTR/reverse DNS record). Prefer this over generic multi-list blacklist checkers when you need authoritative return codes and reason text from SpamRATS NOPTR specifically, or when building automated mail filtering pipelines that need per-list granularity.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-13T00:41:42.119Z","isFirstParty":false,"canonicalSlug":"spamrats-noptr-dnsbl-lookup-88b3f6f7"}