{"id":"9dd25c98-b16a-43c1-8f26-7219a03a967f","shortId":"y8sHw6","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 for email ID 20) 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 are listed at the same $0.02/request price point with no API keys, no rate limits, and no commitments required.\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 usage examples available. The specific functionality of the email attachments endpoint (what input it expects, what attachment data it returns) is not documented beyond the endpoint path and the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","micropayment","pay-per-request"],"categories":["email","data"],"synonyms":["email attachment API","x402 email","micropayment email API","Base USDC API","pay-per-call email","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for request or response payloads","The endpoint targets a hardcoded email ID (20); unclear if this is a demo or production resource","No information on what request body (if any) is expected for the POST call","The broader platform lists many endpoints but none have documented behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/20/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/20/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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of the email attachments endpoint is unclear beyond its URL path. Effectively a stub 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'/docs':137 '/pricing':139 '/readme':141 '/request':118 '0.02':10,22,53,117 '000':57 '20':38,56 '6':61 'Base USDC API' 'accept':65 'access':30 'advertis':76 'ai/ml':87 'analysi':89 'analyt':86 'api':83,123 'application/json':70 'attach':3,15,33,175,182 'avail':168 'base':8,20,50,58 'behind':39 'beyond':189 'broader':73 'challeng':196 'classif':91 'commit':130 'connect':147 'convers':108 'data':85,183 'decim':62 'detail':154 'document':132,163,188 'email':2,14,32,36,174 'email attachment API' 'email-attachments' 'embed':92 'endpoint':26,64,111,176,191 'estim':102 'exampl':167 'exchang':97 'expect':180 'extrem':134 'feed':96 'financ':93 'function':171 'gas':101 'gate':82 'generat':109 'geocod':106 'id':37 'infrastructur':104 'input':178 'key':124 'limit':127 'list':113 'lowpaymentfee' 'lowpaymentfee.com':28,74 'metadata':197 'micropay':6,18 'micropayment' 'micropayment email API' 'network':51 'openapi':158 'page':142 'path':192 'pay-per-call email' 'pay-per-request' 'payment':43 'paywal':42 'per':11,23,54 'platform':75 'point':120 'post':66 'price':95,119 'prompt':149 'provid':29 'quot':100 'rate':98,126 'render':144 'request':12,24,55,67 'request/response':161 'requir':131 'respons':71 'retriev':1,13 'return':69,185 'schema':162 'sentiment':88 'settl':45 'span':84 'spars':135 'spec':159 'specif':34,170 'suit':78 'summar':90 'technic':153 'token':99 'unit':59 'usag':166 'usdc':47 'usdc-base' 'util':105 'valid':107 'via':4,16 'wallet':148 'web3':94 'x402':5,17,41,81,195 'x402 email' 'x402-gated':80 'x402-payment'","prices":[{"id":"83b10a8e-9fa1-491a-ae43-8beea6ccaa13","listingId":"9dd25c98-b16a-43c1-8f26-7219a03a967f","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/20/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":"2026-04-21T18:32:10.897Z"}],"sources":[{"listingId":"9dd25c98-b16a-43c1-8f26-7219a03a967f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/20/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.897Z","lastSeenAt":"2026-04-22T12:05:01.490Z"}],"details":{"listingId":"9dd25c98-b16a-43c1-8f26-7219a03a967f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/20/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 requesting 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/20/attachments"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/emails/20/attachments"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving attachments from a specific email record via programmatic API call","Agent-driven workflows that need to fetch email attachment data without API key provisioning","Demonstrating x402 micropayment integration on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-use email attachment retrieval","Low-volume, on-demand 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 service (this is a single-resource endpoint for email ID 20)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.72Z"},"updatedAt":"2026-04-22T12:05:01.490Z"}}