{"id":"727d7db8-f4e8-4fdb-a4b8-5b2bb702f934","shortId":"SHHQxx","kind":"x402","title":"Retrieve email attachments via x402 micropayment on Base for $0.02 per request.","tagline":"Retrieve email attachments via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 76) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required — callers simply include an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers numerous x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. However, this specific listing is for the email attachments endpoint (`/api/v1/emails/76/attachments`), which is not documented on the provider's landing page among the advertised API categories. The exact schema of the request body and the structure of the returned attachment data are not documented in any available material.\n\nBecause the endpoint path references a specific email ID (76), it is unclear whether this is a general-purpose email attachment retrieval service or a single fixed resource. No OpenAPI spec, request/response examples, or detailed documentation were found. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","email-attachments","usdc-base","micropayment","post-json"],"categories":["storage","email"],"synonyms":["email attachment download","paid email API","x402 email endpoint","micropayment email access","Base USDC email API"],"warnings":["Endpoint /api/v1/emails/76/attachments is not listed among the provider's advertised APIs on the landing page","No request body schema or response schema documented anywhere","Docs, API, pricing, and README pages contain only a 'Connect wallet' prompt with no useful content","Unclear whether this serves a single fixed email or is parameterized for arbitrary email IDs","The nature and origin of the email data is unknown — exercise caution with potentially sensitive content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/76/attachments","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/emails/76/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the endpoint is not listed among the provider's advertised APIs. The purpose and data returned are largely 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'0.02':10,22,59,71,123 '000':65 '20':64 '6':69 '76':37,183 'Base USDC email API' 'accept':43 'access':30 'addit':229 'advertis':149 'ai/ml':113 'among':147 'analyt':112 'api':73,109,150,215 'attach':3,15,33,134,165,195 'avail':172 'base':8,20,56,66 'behind':38 'bodi':158 'broader':100 'call':61 'caller':80 'categori':151 'connect':224 'content':230 'data':111,116,166 'decim':70 'detail':209 'doc':214 'document':140,169,210 'email':2,14,32,35,133,181,194 'email attachment download' 'email-attachments' 'endpoint':26,95,135,176 'exact':153 'exampl':207 'finance/web3':115 'fix':201 'found':212 'gate':108 'general':192 'general-purpos':191 'header':87 'howev':126 'id':36,182 'includ':82 'infer':114 'json':48 'key':74 'land':145 'limit':77 'list':129 'lowpaymentfee.com':28,102 'materi':173 'maxamountrequir':62 'micropay':6,18 'micropayment' 'micropayment email access' 'network':57 'numer':105 'offer':104 'openapi':204 'page':146,219 'paid email API' 'part':97 'path':177 'payment':49,86,92 'paywal':41 'per':11,23,60,124 'platform':101 'post':44 'post-json' 'price':121,216 'prompt':226 'proof':93 'provid':29,143 'purpos':193 'rate':76 'readm':218 'refer':178 'render':221 'request':12,24,45,125,157 'request/response':206 'requir':79 'resourc':202 'retriev':1,13,196 'return':47,164 'schema':154 'servic':119,197 'settl':51 'simpli':81 'singl':200 'span':110 'spec':205 'specif':34,128,180 'structur':161 'unclear':186 'unit':67 'usdc':53 'usdc-base' 'util':118 'valid':90 'via':4,16 'wallet':225 'whether':187 'x':85 'x-payment':84 'x402':5,17,40,91,107 'x402 email endpoint' 'x402-gated':106 'x402-payment'","prices":[{"id":"68ef7671-9dd5-4961-8846-f717e4c0171f","listingId":"727d7db8-f4e8-4fdb-a4b8-5b2bb702f934","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/emails/76/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.493Z"}],"sources":[{"listingId":"727d7db8-f4e8-4fdb-a4b8-5b2bb702f934","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/76/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.493Z","lastSeenAt":"2026-04-22T01:02:05.181Z"}],"details":{"listingId":"727d7db8-f4e8-4fdb-a4b8-5b2bb702f934","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/76/attachments \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/76/attachments"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/76/attachments"}],"useCases":["Retrieving email attachments programmatically via micropayment","Agent-driven access to stored email data without API key management","Pay-per-request email attachment fetching on Base network"],"bestFor":["Agents needing on-demand email attachment retrieval without subscriptions","Developers experimenting with x402 micropayment protocols","Scenarios requiring keyless, pay-per-call access to email data"],"notFor":["Bulk email processing or high-volume attachment downloads (no documented batch support)","Users who need detailed API documentation or guaranteed SLAs","General-purpose email sending or inbox management"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.638Z"},"updatedAt":"2026-04-22T01:02:05.181Z"}}