{"id":"08ce4604-1b59-40bc-92b2-af82b88461ba","shortId":"S37vqL","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 77) 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 pay-per-call APIs 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 share the same $0.02/request pricing model and x402 payment protocol on Base. However, this specific listing covers only the `/api/v1/emails/77/attachments` endpoint.\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 schema, no request/response examples, and no description of what the email attachments endpoint actually returns or what input parameters it expects. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["x402-payment","usdc-base","email-attachments","pay-per-request","no-api-key"],"categories":["data","email"],"synonyms":["email attachment API","x402 email endpoint","pay-per-call email","micropayment email API","Base USDC email","lowpaymentfee email"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The endpoint path references a specific email ID (77); unclear if this is parameterized or fixed","Purpose and content of the email attachments endpoint is undocumented and unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/77/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/77/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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific email attachments endpoint is opaque. Effectively a stub 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'/request':128 '0.02':10,22,60,72,127 '000':66 '20':65 '402':199 '6':70 '77':37 'Base USDC email' 'accept':44 'access':30 'actual':186 'ai/ml':98 'analysi':101 'analyt':97 'api':75,94,152 'attach':3,15,33,184 'base':8,20,57,67,136 'behind':38 'broader':87 'call':62,93 'captur':201 'challeng':200 'classif':103 'commit':80 'confirm':197 'connect':161 'convers':120 'cover':141 'data':96,106 'decim':71 'descript':179 'detail':168 'difficult':209 'doc':151 'document':146,206 'email':2,14,32,35,183 'email attachment API' 'email-attachments' 'embed':104 'endpoint':26,43,123,145,185,195 'estim':114 'exampl':176 'exchang':109 'expect':193 'experiment':213 'extrem':148 'feed':108 'finance/web3':105 'gas':113 'generat':121 'geocod':118 'host':85 'howev':137 'id':36 'infer':99 'infrastructur':116 'input':190 'json':49 'key':76 'lack':204 'limit':78 'list':140 'live':198 'lowpaymentfee email' 'lowpaymentfee.com':28,84 'make':207 'maxamountrequir':63 'micropay':6,18 'micropayment email API' 'model':130 'network':58 'no-api-key' 'openapi':172 'page':156 'paramet':191 'pay':91 'pay-per-cal':90 'pay-per-call email' 'pay-per-request' 'payment':50,133 'paywal':41 'per':11,23,61,92 'post':45 'price':107,129,153 'prompt':163 'protocol':134 'provid':29,83 'quot':112 'rate':77,110 'readm':155 'render':158 'request':12,24,46 'request/response':175 'requir':81 'retriev':1,13 'return':48,187 'schema':173 'sentiment':100 'settl':52 'share':124 'span':95 'spars':149 'specif':34,139 'suit':88 'summar':102 'technic':167 'token':111 'unit':68 'usdc':54 'usdc-base' 'use':211 'util':117 'valid':119 'via':4,16 'wallet':162 'without':212 'x402':5,17,40,132 'x402 email endpoint' 'x402-payment'","prices":[{"id":"a0bbb9f6-b0aa-4eb7-a589-1976019e77ad","listingId":"08ce4604-1b59-40bc-92b2-af82b88461ba","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/77/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":"2026-04-21T18:32:12.459Z"}],"sources":[{"listingId":"08ce4604-1b59-40bc-92b2-af82b88461ba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/77/attachments","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.459Z","lastSeenAt":"2026-04-22T07:01:53.821Z"}],"details":{"listingId":"08ce4604-1b59-40bc-92b2-af82b88461ba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/77/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 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/77/attachments"},{"claim":"All endpoints on lowpaymentfee.com are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/77/attachments"}],"useCases":["Retrieving email attachments programmatically via micropayment","Integrating email data access into agent workflows without API key management","Paying per-request for on-demand email attachment retrieval"],"bestFor":["Agents needing one-off email attachment retrieval without subscription","Developers experimenting with x402 payment protocol","Low-volume, pay-as-you-go email data access"],"notFor":["High-volume email processing requiring bulk pricing or rate guarantees","Users needing detailed API documentation or schema validation before integration","General-purpose email sending or inbox management"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.64Z"},"updatedAt":"2026-04-22T07:01:53.821Z"}}