{"uid":"cap_x_5IoHwv92hePkp2wZg8f","slug":"is-email-hosted-by-fastmail-bulk-17a1287b","name":"is-email-hosted-by-fastmail-bulk","description":"Bulk is email hosted by fastmail: up to 20 domains in one call, processed concurrently, results in input order with a per-item error field and a failure count. Same answer per item as the single endpoint. Batch enrichment for agents that hold a list. $0.10 per batch.","url":"https://email.intel.rallylive.ca/bulk/email/hosted-by/fastmail?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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":"0.1","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":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_KW1TvXL5HE4z4d89W95B7","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether up to 20 domains' email is hosted by Fastmail in a single concurrent batch call, returning one result per domain with per-item error fields and a failure count.","exampleAgentPrompt":"Can you check all 15 domains in my prospect list and tell me which ones are hosting their email with Fastmail? Here are the domains: acme.com, bravo.io, charlie.net, ... (up to 20).","exampleUseCases":[{"title":"Prospect list email stack enrichment","prompt":"I have a list of 18 SaaS company domains and I want to know which of them are using Fastmail to host their email — can you run them all through at once and give me the results?"},{"title":"CRM data enrichment pipeline","prompt":"Before we import these 20 leads into the CRM, check each domain to see if they're on Fastmail email hosting so we can tag them accordingly."},{"title":"Competitor tech-stack research","prompt":"We think several of our competitors use Fastmail — can you batch-check these 12 domains and tell me which ones are actually Fastmail-hosted, and flag any that errored out?"}],"resultDescription":"An ordered array of results matching the input domain list, each containing a boolean indicating whether that domain's email is hosted by Fastmail, a per-item error field if the lookup failed, and a summary failure count for the entire batch.","failureModes":["Individual domain DNS lookup failures captured in per-item error field without failing the whole batch","Exceeding the 20-domain limit may result in rejection or partial processing","Malformed domain inputs may trigger per-item errors","Network timeout on DNS resolution for specific domains","Service unavailability returning a top-level error for the entire batch"],"whenToPreferThis":"Use this endpoint when you have a list of 2–20 domains and need to check Fastmail hosting status for all of them efficiently in one call rather than making separate single-domain requests. It is preferable to the single endpoint whenever you're doing bulk enrichment, processing lead lists, or building data pipelines that require concurrent lookups with ordered, per-item results.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-24T00:43:01.070Z","isFirstParty":false,"canonicalSlug":"is-email-hosted-by-fastmail-bulk-17a1287b"}