{"id":"cb8915bf-f865-43db-af1c-e6dd066c3cba","shortId":"vr26zY","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 17) 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 subscriptions required.\n\nThe provider lowpaymentfee.com hosts a broader suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and infrastructure utilities — all priced at $0.02 per request. However, this specific listing covers only the `/api/v1/emails/17/attachments` endpoint. Documentation on the site is extremely thin: the docs, pricing, and API 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 from the crawled material.\n\nBecause the endpoint path references a hardcoded email ID (17), it is unclear whether this is a demonstration endpoint, a single-resource accessor, or whether the ID is parameterizable. The lack of documentation makes it impossible to confirm what request body (if any) is expected or what the response payload looks like. The endpoint is confirmed live via a valid 402 challenge.","tags":[],"capabilities":["x402-payment","email-attachments","usdc-base","micropayment","post-endpoint","json-response"],"categories":["email","storage"],"synonyms":["email attachment API","x402 email endpoint","paid email access","Base USDC email API","micropayment email attachments","402 email endpoint"],"warnings":["No API documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content.","Endpoint path references a hardcoded email ID (17); unclear if this is parameterizable or a demo resource.","No request body schema or response schema documented anywhere.","No OpenAPI spec or ai-plugin manifest found.","The purpose and content of the email attachments endpoint is unverified — could be demo/placeholder data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/17/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/17/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 via a valid x402 402 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response schemas, no examples, and the docs pages are empty. The endpoint path is hardcoded to a single email ID with no explanation. This is effectively a stub 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'0.02':10,22,60,72,113 '000':66 '17':37,177 '20':65 '402':229 '402 email endpoint' '6':70 'Base USDC email API' 'accept':44 'access':30 'accessor':191 'ai/ml':97 'analysi':100 'analyt':96 'api':75,93,136 'attach':3,15,33 'avail':163 'base':8,20,57,67 'behind':38 'bodi':209 'broader':87 'call':62 'challeng':230 'classif':102 'confirm':206,224 'connect':142 'cover':120 'crawl':166 'data':95,105 'decim':71 'demonstr':185 'detail':149 'doc':133 'document':125,158,201 'email':2,14,32,35,175 'email attachment API' 'email-attachments' 'embed':103 'endpoint':26,43,124,170,186,222 'exampl':162 'expect':213 'extrem':130 'feed':106 'finance/crypto':104 'gate':92 'hardcod':174 'host':85 'howev':116 'id':36,176,195 'imposs':204 'infer':98 'infrastructur':108 'json':49 'json-response' 'key':76 'lack':199 'like':220 'limit':78 'list':119 'live':225 'look':219 'lowpaymentfee.com':28,84 'make':202 'materi':167 'maxamountrequir':63 'micropay':6,18 'micropayment' 'micropayment email attachments' 'network':58 'openapi':153 'page':137 'paid email access' 'parameteriz':197 'path':171 'payload':218 'payment':50 'paywal':41 'per':11,23,61,114 'post':45 'post-endpoint' 'price':111,134 'prompt':144 'provid':29,83 'rate':77 'refer':172 'render':139 'request':12,24,46,115,208 'request/response':156 'requir':81 'resourc':190 'respons':217 'retriev':1,13 'return':48 'schema':157 'sentiment':99 'settl':52 'singl':189 'single-resourc':188 'site':128 'span':94 'spec':154 'specif':34,118 'subscript':80 'suit':88 'summar':101 'technic':148 'thin':131 'unclear':180 'unit':68 'usag':161 'usdc':54 'usdc-base' 'util':109 'valid':228 'via':4,16,226 'wallet':143 'whether':181,193 'x402':5,17,40,91 'x402 email endpoint' 'x402-gated':90 'x402-payment'","prices":[{"id":"217657f0-25c8-46bb-be30-6e823dcace8f","listingId":"cb8915bf-f865-43db-af1c-e6dd066c3cba","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/17/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":"2026-04-21T18:32:11.026Z"}],"sources":[{"listingId":"cb8915bf-f865-43db-af1c-e6dd066c3cba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/17/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:11.026Z","lastSeenAt":"2026-04-22T02:31:49.161Z"}],"details":{"listingId":"cb8915bf-f865-43db-af1c-e6dd066c3cba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/17/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 a valid x402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/17/attachments"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/17/attachments"}],"useCases":["Programmatically retrieving email attachments behind a paywall","Agent-driven access to stored email data without API key management","Pay-per-request email attachment downloads on Base network"],"bestFor":["Agents needing keyless, pay-per-call access to email attachments","Developers experimenting with x402 micropayment protocols","Workflows requiring on-demand email attachment retrieval"],"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 sending or inbox management"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.478Z"},"updatedAt":"2026-04-22T02:31:49.161Z"}}