{"id":"984cf6c2-6adb-44b5-9542-c5592693dc51","shortId":"QJVbNL","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/inbox/181` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns `application/json`. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\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 generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during the crawl. The exact functionality behind this particular inbox endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee","no-key api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/inbox/181 ('Premium API Access') is not described anywhere in crawled materials","No example request or response payloads found — integration requires trial and error","Pricing and /README pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/181","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/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no documentation, no example requests or responses, and the purpose of the specific '/api/v1/inbox/181' endpoint is entirely unclear. The broader site lists many endpoints but provides no detail on inputs, outputs, or 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'/request':13,29 '0.02':12,28,62,125,179 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x8335':119 '20':113 '2913':120 '300':147 '402':108 '402 payment api' '6':129 'accept':133 'access':104 'across':47 'address':143 'advertis':153 'ai/ml':50 'analysi':157 'analyt':49 'api':5,21,39,76,103 'application/json':138 'attach':87 'avail':208 'base':8,24,70,115,122 'base usdc api' 'behind':200 'broader':151 'call':4,20 'caller':85 'challeng':109 'classif':160 'commit':84 'convers':172 'crawl':196 'data':48,53 'decim':130 'detail':186 'document':187 'embed':161 'enabl':38 'endpoint':46,58,97,132,154,204 'equal':124 'estim':169 'exact':198 'exampl':189 'exchang':164 'feed':163 'finance/web3':52 'found':193 'function':199 'gas':168 'generat':174 'geocod':170 'given':126 'header':91 'howev':182 'inbox':203 'infer':51 'infrastructur':55 'json-response' 'key':15,31,77 'limit':80 'list':100 'lowpaymentfee' 'lowpaymentfee.com':33 'materi':209 'micropayment api' 'network':71 'no-api-key' 'no-key api' 'offer':42 'openapi':184 'paid':65 'particular':202 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'pay-per-request' 'payload':191 'payment':90,139 'per':3,19,63 'platform':6,22,40,73,152 'point':181 'post':134 'post-method' 'premium':102 'price':60,162,180 'quot':167 'rate':79,165 'request':64,94,110,135 'request/response':190 'requir':16,32,74 'return':106,137 'schema':185 'second':148 'sent':141 'sentiment':156 'simpli':86 'specif':96 'summar':159 'text':158 'timeout':149 'token':166 'unclear':206 'unit':116 'upfront':83 'usdc':9,25,67,118,127 'usdc-base' 'util':56 'valid':171 'varieti':44 'via':10,26 'x402':11,27,37,89 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"ab6919d1-007b-4a48-a729-8d5db1e480b4","listingId":"984cf6c2-6adb-44b5-9542-c5592693dc51","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/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.760Z"}],"sources":[{"listingId":"984cf6c2-6adb-44b5-9542-c5592693dc51","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/181","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.760Z","lastSeenAt":"2026-04-22T13:32:23.704Z"}],"details":{"listingId":"984cf6c2-6adb-44b5-9542-c5592693dc51","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/181 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/inbox/181"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making low-cost per-request API calls settled on Base L2 in USDC","Agent-driven workflows that need instant, keyless API access with crypto micropayments"],"bestFor":["Developers wanting zero-friction pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost API calls without subscription overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may not be cost-effective","Developers who cannot or prefer not to pay in crypto (USDC on Base)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.388Z"},"updatedAt":"2026-04-22T13:32:23.704Z"}}