{"id":"ef3da67a-4888-4d38-8d67-94fb1007eeb5","shortId":"zC8mM6","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint at `/api/v1/inbox/44` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout window.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02/request price point. However, the specific functionality behind the `/api/v1/inbox/44` path is not documented beyond the generic \"Premium API Access\" label, so its exact behavior is unclear. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","crypto API access"],"warnings":["The specific functionality of /api/v1/inbox/44 is undocumented — 'Premium API Access' is a generic label with no further detail.","No OpenAPI spec, request schema, or response schema is available.","The /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet').","The broader site lists many endpoints but none match the /api/v1/inbox/44 path, raising questions about what this endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/44","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for what /api/v1/inbox/44 actually does, no request/response schema, and no examples. The 'Premium API Access' label is entirely generic. Most crawled pages returned only 'Connect wallet' with no useful 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'/request':11,26,165 '0.02':10,25,61,114,164 '000':103 '0x8335':108 '20':102 '2913':109 '300':130 '6':118 'Base network API' 'USDC pay-per-call' 'accept':92 'access':90,184 'advertis':98,137 'ai/ml':49 'analysi':141 'analyt':48 'api':5,20,37,73,89,183 'base':8,23,69,104,111 'behavior':189 'behind':172 'beyond':179 'broad':42 'broader':135 'call':4,19 'catalog':43 'challeng':97 'classif':144 'convers':156 'crawl':204 'crypto API access' 'data':47,52,158 'decim':119 'detail':198 'document':178,199 'embed':145 'enabl':36 'endpoint':45,57,82,138 'equal':113 'estim':153 'everi':56 'exact':126,188 'exampl':196 'exchang':148 'feed':147 'finance/web3':51 'found':201 'function':171 'gas':152 'generat':159 'generic':181 'geocod':154 'given':115 'howev':168 'infer':50 'infrastructur':54 'json-response' 'key':74 'label':185 'limit':76 'list':86 'low payment fee API' 'lowpaymentfee.com':31 'made':122 'maxamountrequir':100 'micropayment API' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':193 'paid':64 'path':175 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payment':15,30,120 'per':3,18,62 'platform':6,21,38,136 'point':167 'post':93 'post-endpoint' 'premium':88,182 'price':59,146,166 'quot':151 'rate':75,149 'request':63,94 'request/response':195 'requir':79 'schema':194 'scheme':127 'second':131 'sentiment':140 'span':46 'specif':81,170 'subscript':78 'summar':143 'text':142 'timeout':132 'token':150 'unclear':191 'unit':105 'usdc':14,29,66,107,116 'usdc-base-network' 'util':55 'valid':155 'via':12,27,123 'window':133 'x402':13,28,35,96,125 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"dd9ae871-52e4-4288-8fb3-275cab924420","listingId":"ef3da67a-4888-4d38-8d67-94fb1007eeb5","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.741Z"}],"sources":[{"listingId":"ef3da67a-4888-4d38-8d67-94fb1007eeb5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.741Z","lastSeenAt":"2026-04-22T04:02:46.175Z"}],"details":{"listingId":"ef3da67a-4888-4d38-8d67-94fb1007eeb5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/44 \\\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 maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/44"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/44"},{"claim":"Platform pricing is $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing low-friction, key-free API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring non-crypto payment methods","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.985Z"},"updatedAt":"2026-04-22T04:02:46.175Z"}}