{"id":"f65c985d-f402-41f0-9bcc-86bfa7c08888","shortId":"F6jwaB","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 through a pay-per-call x402 protocol. The specific resource `/api/v1/emails/100/attachments` accepts POST requests and charges 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equals $0.02 per request. Payment is handled via the x402 exact scheme with no API keys or rate limits required.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-gated APIs across categories including data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. However, the specific endpoint being listed here is for email attachments, which is not prominently documented on the provider's landing page. The crawled documentation pages (docs, api, pricing, README) all returned minimal content (just a \"Connect wallet\" prompt), so there is no detailed schema, request/response format, or usage documentation available for this endpoint.\n\nWithout documentation on what request body to send or what the response looks like, the practical utility of this endpoint is difficult to assess. The x402 challenge confirms the endpoint is live and accepting payment negotiations, but the actual functionality behind the paywall remains opaque.","tags":[],"capabilities":["x402-payment","email-attachments","usdc-base","pay-per-request","no-api-key"],"categories":["email","data"],"synonyms":["email attachment API","fetch email attachments","email data endpoint","x402 email API","micropayment email access"],"warnings":["No documentation available — docs, api, pricing, and README pages all return only a 'Connect wallet' prompt with no content.","The endpoint path '/api/v1/emails/100/attachments' is not listed among the provider's advertised APIs on the landing page, raising questions about whether this is a production resource.","Request and response schemas are completely unknown; no example payloads are available.","The hardcoded '100' in the path suggests this may be a specific email ID rather than a general-purpose endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/100/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/100/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on request/response schemas, no OpenAPI spec, and the endpoint's specific functionality (email attachments) is not mentioned anywhere on the provider's site. Effectively a stub 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'0.02':10,22,67,118 '000':52 '20':51 '6':59 'accept':46,208 'access':30 'across':103 'actual':213 'ai/ml':108 'analyt':107 'api':80,102,148 'assess':198 'attach':3,15,33,131 'avail':171 'base':8,20,53,63 'behind':215 'bodi':180 'broader':92 'call':39 'categori':104 'challeng':201 'charg':50 'coin':58 'confirm':202 'connect':157 'content':154 'crawl':144 'data':106 'decim':60 'detail':164 'difficult':196 'doc':147 'document':136,145,170,176 'dozen':97 'email':2,14,32,130 'email attachment API' 'email data endpoint' 'email-attachments' 'endpoint':26,87,124,174,194,204 'equal':66 'exact':76 'fetch email attachments' 'financ':110 'format':167 'function':214 'gate':101 'handl':72 'howev':121 'includ':105 'infer':109 'infrastructur':113 'key':81 'land':141 'like':188 'limit':84 'list':126 'live':206 'look':187 'lowpaymentfee.com':28,94 'micropay':6,18 'micropayment email access' 'minim':153 'negoti':210 'network':64 'no-api-key' 'offer':96 'opaqu':219 'page':142,146 'part':89 'pay':37 'pay-per-cal':36 'pay-per-request' 'payment':70,209 'paywal':217 'per':11,23,38,68,119 'platform':93 'post':47 'practic':190 'price':116,149 'promin':135 'prompt':159 'protocol':41 'provid':29,139 'rate':83 'readm':150 'remain':218 'request':12,24,48,69,120,179 'request/response':166 'requir':85 'resourc':44 'respons':186 'retriev':1,13 'return':152 'schema':165 'scheme':77 'send':182 'specif':43,123 'unit':54 'usag':169 'usd':57 'usdc':56 'usdc-base' 'util':114,191 'via':4,16,73 'wallet':158 'web3':111 'without':175 'x402':5,17,40,75,100,200 'x402 email API' 'x402-gated':99 'x402-payment'","prices":[{"id":"e85eb8ea-df6e-434a-8454-05aab76aa959","listingId":"f65c985d-f402-41f0-9bcc-86bfa7c08888","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/100/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":"2026-04-21T18:32:10.618Z"}],"sources":[{"listingId":"f65c985d-f402-41f0-9bcc-86bfa7c08888","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/100/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.618Z","lastSeenAt":"2026-04-22T13:32:09.189Z"}],"details":{"listingId":"f65c985d-f402-41f0-9bcc-86bfa7c08888","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/100/attachments \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/100/attachments"},{"claim":"All APIs on the platform 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 asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 corresponds to USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/100/attachments"}],"useCases":["Programmatically retrieving attachments from a specific email resource","Agent-driven email attachment fetching with per-call micropayments","Integrating email attachment access into automated workflows without API key management"],"bestFor":["Agents needing on-demand email attachment retrieval with no subscription","Developers wanting key-free, pay-per-use email data access on Base network","Automated pipelines that need low-cost attachment fetching"],"notFor":["Bulk email processing requiring detailed documentation and guaranteed SLAs","Users who need comprehensive API documentation before integrating","Non-crypto users who cannot pay via USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.01Z"},"updatedAt":"2026-04-22T13:32:09.189Z"}}