{"id":"10043ab0-4ccd-441a-8b13-f0ef6bc937c6","shortId":"YwqGVN","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API marketplace that gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/62` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made via the x402 `X-PAYMENT` header with the `exact` scheme — no API keys, accounts, or rate limits are required.\n\nThe broader platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing.\n\nNote that the specific functionality behind the `/api/v1/inbox/62` path is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) all returned only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a valid 402 challenge), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","pay-per-use","no-api-key","no-rate-limit","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 api","micropayment api","pay-per-call api","base usdc api","lowpaymentfee","low payment fee","402 payment api"],"warnings":["No documentation available for the specific /api/v1/inbox/62 endpoint — its actual functionality is unknown","No OpenAPI schema or request/response examples provided","Crawled docs, pricing, and README pages returned only 'Connect wallet' with no content","The generic 'Premium API Access' label does not describe what data or service is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/62","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/inbox/62","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 with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation explaining what the /api/v1/inbox/62 endpoint actually does. The crawled pages beyond the homepage returned no useful content. The listing is effectively a 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'/request':17,34,158 '0.02':16,33,75,157 '000':79 '20':78 '402':214 '402 payment api' '6':85 'access':70,177 'account':104 'actual':219 'addit':204 'advertis':113 'ai':10,27,125 'analysi':129 'analyt':119 'api':4,21,40,69,102,117,176,194 'base':7,24,58,80 'base usdc api' 'behind':48,165 'beyond':172 'broader':111 'call':77 'categori':115 'challeng':215 'classif':132 'confirm':209 'connect':199 'content':205 'convers':149 'cost':72 'crawl':189 'data':9,26,118,122 'decim':86 'doc':190 'document':171 'embed':133 'endpoint':14,31,47,62,153,207 'estim':143 'exact':99 'exampl':186 'exchang':138 'export':123 'feed':137 'financ':11,28,134 'four':114 'function':164 'gas':142 'gate':3,20,43 'generat':150 'generic':174 'geocod':147 'header':96 'infrastructur':145 'insight':124 'json-response' 'key':103 'label':178 'learn':127 'limit':107 'list':66,152 'live':210 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':126 'made':89 'marketplac':41 'metric':120 'micropay':52 'micropayment api' 'network':59 'no-api-key' 'no-rate-limit' 'note':160 'offer':8,25 'openapi':182 'page':191 'path':168 'pay-per-call api' 'pay-per-use' 'payment':87,95,223 'per':50,76 'per-request':49 'per-request-micropayment' 'platform':5,22,112 'premium':68,175 'price':136,159,192 'prompt':201 'protocol':39 'quot':141 'rate':106,139 'readm':193 'report':121 'request':51 'request/response':185 'requir':109 'return':196,211,220 'schema':183 'scheme':100 'sentiment':128 'settl':53 'share':154 'specif':61,163 'success':222 'summar':131 'text':130 'token':140 'unit':81 'unknown':225 'upon':221 'usdc':55,83 'usdc-base' 'util':13,30,146 'valid':148,213 'varieti':45 'via':90 'wallet':200 'web3':135 'x':94 'x-payment':93 'x402':2,19,38,92 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"970a162d-5d95-4723-aa61-7003af01799b","listingId":"10043ab0-4ccd-441a-8b13-f0ef6bc937c6","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/inbox/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.997Z"}],"sources":[{"listingId":"10043ab0-4ccd-441a-8b13-f0ef6bc937c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.997Z","lastSeenAt":"2026-04-22T05:32:10.429Z"}],"details":{"listingId":"10043ab0-4ccd-441a-8b13-f0ef6bc937c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/62 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/62"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/62"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-request access"],"bestFor":["Developers or agents who want zero-signup API access via crypto micropayments","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions","x402-compatible AI agents operating on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscription plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.119Z"},"updatedAt":"2026-04-22T05:32:10.429Z"}}