{"id":"fc090fe3-911a-4e3f-99b3-f92b8b1ff3e7","shortId":"8ba4Xu","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 70) behind an x402 paywall. The endpoint 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), with no API keys, rate limits, or commitments required.\n\nThe provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request on Base. However, this specific listing covers only the `/api/v1/emails/70/attachments` endpoint.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned 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 endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual behavior, required request body fields, and response format are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","micropayment","post-json"],"categories":["data","email"],"synonyms":["email attachment API","paid email access","x402 email endpoint","lowpaymentfee email","micropayment email API","Base USDC email"],"warnings":["No API documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no technical content","No OpenAPI or schema specification found","Endpoint is scoped to a single email ID (70); unclear if other email IDs are available or what the attachment content contains","No request body schema or response schema documented — actual usage is unknown","The purpose and content of 'email 70 attachments' is entirely opaque"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/70/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/70/attachments","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid 402 x402 challenge, but there is no documentation, no OpenAPI spec, no request/response examples, and the endpoint path suggests a very narrow scope (single email ID). The broader site offers many endpoints but none are documented beyond a name and 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'0.02':10,22,60,72,123 '000':66 '20':65 '402':183 '6':70 '70':37 'Base USDC email' 'accept':44 'access':30 'actual':188 'ai/ml':97 'analyt':96 'api':75,93,144 'attach':3,15,33 'avail':174 'base':8,20,57,67,127 'behavior':189 'behind':38 'bodi':192 'broader':87 'call':62 'challeng':185 'classif':101 'commit':80 'confirm':178 'connect':153 'convers':118 'cover':132 'crawl':142 'data':95 'decim':71 'detail':160 'doc':143 'document':137,169 'email':2,14,32,35 'email attachment API' 'email-attachments' 'embed':102 'endpoint':26,43,136,176 'estim':112 'exampl':172 'exchang':107 'extrem':139 'feed':106 'field':193 'financ':103 'format':196 'gas':111 'gate':92 'generat':119 'geocod':116 'host':85 'howev':128 'id':36 'infer':98 'infrastructur':114 'json':49 'key':76 'limit':78 'list':131 'live':179 'lowpaymentfee email' 'lowpaymentfee.com':28,84 'maxamountrequir':63 'micropay':6,18 'micropayment' 'micropayment email API' 'network':58 'openapi':164 'page':148 'paid email access' 'payload':173 'payment':50 'paywal':41 'per':11,23,61,124 'post':45 'post-json' 'price':105,121,145 'prompt':155 'proper':182 'provid':29,83 'quot':110 'rate':77,108 'readm':147 'request':12,24,46,125,191 'request/response':167 'requir':81,190 'respons':195 'retriev':1,13 'return':48,150,180 'schema':168 'sentiment':99 'settl':52 'span':94 'spars':140 'spec':165 'specif':34,130 'suit':88 'summar':100 'technic':159 'token':109 'unit':68 'unknown':198 'usdc':54 'usdc-base' 'util':115 'valid':117 'via':4,16 'wallet':154 'web3':104 'x402':5,17,40,91,184 'x402 email endpoint' 'x402-gated':90 'x402-payment'","prices":[{"id":"7f17b7a6-685c-4fb6-92b2-52150589c7f5","listingId":"fc090fe3-911a-4e3f-99b3-f92b8b1ff3e7","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/70/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":"2026-04-21T18:32:12.481Z"}],"sources":[{"listingId":"fc090fe3-911a-4e3f-99b3-f92b8b1ff3e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/70/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.481Z","lastSeenAt":"2026-04-22T07:01:53.842Z"}],"details":{"listingId":"fc090fe3-911a-4e3f-99b3-f92b8b1ff3e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/70/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/emails/70/attachments"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/70/attachments"}],"useCases":["Programmatically retrieving email attachments behind a paywall","Agent-driven access to stored email data with per-request micropayments","Integrating email attachment retrieval into automated workflows without API key management"],"bestFor":["Agents needing on-demand email attachment access with no signup","Developers experimenting with x402 micropayment protocols","Workflows requiring pay-per-use email data retrieval on Base"],"notFor":["Bulk email processing requiring high throughput at low marginal cost","Users who need detailed API documentation or guaranteed SLAs","Accessing emails other than ID 70 (endpoint is scoped to a single email)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.741Z"},"updatedAt":"2026-04-22T07:01:53.842Z"}}