{"id":"155a5dc3-020b-4f9a-8de5-441fccc4c5c9","shortId":"LCjhLk","kind":"x402","title":"Retrieve email attachments via x402 micropayment on Base (USDC, $0.02/request).","tagline":"Retrieve email attachments via x402 micropayment on Base (USDC, $0.02/request).","description":"This endpoint at lowpaymentfee.com provides access to email attachments (specifically email ID 75) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-scheme micropayment of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of x402-gated API endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint being listed here — `/api/v1/emails/75/attachments` — is not prominently featured on the site's landing page, and no documentation, request schema, or response schema is available beyond the x402 challenge metadata. The endpoint is confirmed live (HTTP 402 challenge returned successfully), but the actual behavior, required POST body, and response format are undocumented. Use with caution until more documentation surfaces.","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 data","lowpaymentfee email","Base USDC API","micropayment email access"],"warnings":["No request or response schema documented — input format for POST body is unknown","This endpoint targets a hardcoded email ID (75); unclear if other IDs are available or what data is returned","The /api/v1/emails/* path is not listed among the site's advertised API categories","Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/75/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/75/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, but there is no OpenAPI schema, no request/response documentation, and the specific email-attachments endpoint is not listed on the site's landing page. The purpose and expected input/output are entirely unclear beyond the generic 'Premium API Access' 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'/request':11,22 '0.02':10,21,72,125 '000':67 '0x8335':57 '20':66 '2913':58 '402':178 '6':77 '75':35 'Base USDC API' 'accept':41 'access':28 'actual':184 'advertis':83 'ai/ml':96 'analysi':99 'analyt':95 'api':91,130 'attach':3,14,31 'avail':166 'base':8,19,52,68 'behavior':185 'behind':36 'beyond':167 'bodi':188 'broader':80 'catalog':86 'caution':196 'challeng':170,179 'classif':101 'commit':138 'confirm':175 'contract':56 'convers':118 'data':94,104 'decim':78 'document':159,199 'email':2,13,30,33 'email attachment API' 'email-attachments' 'embed':102 'endpoint':24,92,121,142,173 'equal':71 'estim':112 'exact':62 'exact-schem':61 'exchang':107 'featur':150 'feed':106 'finance/web3':103 'format':191 'gas':111 'gate':90 'generat':119 'geocod':116 'http':177 'id':34 'infer':97 'infrastructur':114 'json':46 'json-response' 'key':131 'land':155 'limit':134 'list':123,144 'live':176 'lowpaymentfee email' 'lowpaymentfee.com':26,81 'metadata':171 'micropay':6,17,64 'micropayment' 'micropayment email access' 'minimum':137 'network':53 'page':156 'paid email data' 'payment':47 'paywal':39 'per':73,126 'platform':82 'post':42,187 'post-endpoint' 'price':105 'promin':149 'provid':27 'quot':110 'rate':108,133 'request':43,74,127,160 'requir':139,186 'respons':163,190 'retriev':1,12 'return':45,180 'schema':161,164 'scheme':63 'sentiment':98 'settl':49 'site':153 'span':93 'specif':32,141 'success':181 'summar':100 'surfac':200 'token':109 'undocu':193 'unit':69 'usdc':9,20,55,75 'usdc-base' 'use':54,76,194 'util':115 'valid':117 'via':4,15 'wide':85 'x402':5,16,38,89,169 'x402 email endpoint' 'x402-gated':88 'x402-payment'","prices":[{"id":"620137aa-bc87-46f1-9f50-2731706b5e1c","listingId":"155a5dc3-020b-4f9a-8de5-441fccc4c5c9","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/75/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":"2026-04-21T18:32:12.664Z"}],"sources":[{"listingId":"155a5dc3-020b-4f9a-8de5-441fccc4c5c9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/75/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.664Z","lastSeenAt":"2026-04-22T05:31:59.846Z"}],"details":{"listingId":"155a5dc3-020b-4f9a-8de5-441fccc4c5c9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/75/attachments \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/75/attachments"},{"claim":"All endpoints on the platform are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/75/attachments"}],"useCases":["Retrieving attachments from a specific email record via programmatic API call","Agent-driven workflows that need to fetch email attachment data with per-request payment","Integrating email attachment retrieval into automated pipelines without API key management"],"bestFor":["Agents or scripts that need on-demand email attachment access with no subscription","Developers exploring x402 micropayment patterns on Base","Low-volume, pay-per-use email data retrieval"],"notFor":["Bulk email processing or high-throughput attachment downloads (no documented batch support)","Users who need detailed API documentation or guaranteed SLAs before integrating","Accessing emails other than ID 75 (this endpoint is scoped to a single email)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.384Z"},"updatedAt":"2026-04-22T05:31:59.846Z"}}