{"id":"34ac0c65-ecaf-490d-9e97-6e1a765ca21e","shortId":"kfSbrD","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 44) behind an x402 paywall. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units with 6 decimals). The endpoint accepts POST requests and returns application/json responses.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol using USDC on Base.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific purpose of the /emails/44/attachments endpoint is unclear — it may be a demo or placeholder resource. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","micropayment","post-endpoint","json-response"],"categories":["data","email"],"synonyms":["email attachment API","x402 email endpoint","paid email API","lowpaymentfee","micropayment email","Base USDC API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema provided for request or response bodies","The endpoint path /api/v1/emails/44/attachments references a hardcoded email ID (44), suggesting this may be a demo or placeholder","The broader platform lists many API categories but none appear to have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/44/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/44/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works. However, there is no OpenAPI spec, no request/response documentation, no examples, and the docs pages are empty. The specific purpose of the /emails/44/attachments resource is unclear and may be a demo endpoint. This is effectively a stub 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'/request':115 '0.02':10,22,52,114 '000':56 '20':55 '44':37 '6':60 'Base USDC API' 'accept':64 'access':30 'advertis':75 'ai/ml':86 'analysi':88 'analyt':85 'api':82,119,146 'application/json':69 'attach':3,15,33 'avail':176 'base':8,20,49,57,139 'behind':38 'broader':72 'challeng':196 'classif':90 'commit':126 'confirm':203 'connect':155 'convers':107 'data':84 'decim':61 'demo':190 'detail':162 'doc':145 'document':140,171 'email':2,14,32,35 'email attachment API' 'email-attachments' 'embed':91 'endpoint':26,63,110,183,205 'entir':131 'estim':101 'exampl':174 'exchang':96 'extrem':142 'feed':95 'financ':92 'form':202 'gas':100 'gate':81 'generat':108 'geocod':105 'handl':130 'id':36 'infrastructur':103 'json-response' 'key':120 'limit':123 'live':198 'lowpaymentfee' 'lowpaymentfee.com':28,73 'may':187 'micropay':6,18 'micropayment' 'micropayment email' 'network':50 'openapi':166 'oper':207 'page':150 'paid email API' 'payload':175 'payment':42,128 'paywal':41 'per':11,23,53 'placehold':192 'platform':74 'post':65 'post-endpoint' 'price':94,116,147 'prompt':157 'protocol':135 'provid':29 'purpos':179 'quot':99 'rate':97,122 'readm':149 'render':152 'request':12,24,54,66 'request/response':169 'requir':127 'resourc':193 'respons':70 'retriev':1,13 'return':68 'schema':170 'sentiment':87 'settl':44 'share':111 'span':83 'spars':143 'spec':167 'specif':34,178 'suit':77 'summar':89 'technic':161 'token':98 'unclear':185 'unit':58 'usdc':46,137 'usdc-base' 'use':136 'util':104 'valid':106 'via':4,16,132 'wallet':156 'web3':93 'well':201 'well-form':200 'x402':5,17,40,80,134,195 'x402 email endpoint' 'x402-gated':79 'x402-payment'","prices":[{"id":"67a958b7-b22a-4c7d-837d-4e6c0c682da2","listingId":"34ac0c65-ecaf-490d-9e97-6e1a765ca21e","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/44/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":"2026-04-21T18:32:11.173Z"}],"sources":[{"listingId":"34ac0c65-ecaf-490d-9e97-6e1a765ca21e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/44/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.173Z","lastSeenAt":"2026-04-22T08:32:01.948Z"}],"details":{"listingId":"34ac0c65-ecaf-490d-9e97-6e1a765ca21e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/44/attachments \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/44/attachments"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving email attachments programmatically via micropayment","Demonstrating x402 payment protocol integration","Agent-driven document retrieval behind a paywall"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents that need to fetch email attachments without API key management","Low-cost per-request data access on Base network"],"notFor":["Production email systems requiring documented schemas and SLAs","Bulk email processing where per-request fees add up","Users needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.245Z"},"updatedAt":"2026-04-22T08:32:01.948Z"}}