{"id":"4c649e15-f18e-4f1a-a927-ebe15d083901","shortId":"Ax43dz","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/payments/14` 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 payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\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 price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints are undocumented in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method","analytics-api","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access","no-auth API","micropayment endpoint"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) all returned only 'Connect wallet' with no substantive content","The endpoint path /api/v1/payments/14 does not correspond to any of the named endpoints listed on the homepage — its actual functionality is unknown","No request or response schema is available; callers cannot know what to send or expect back","No OpenAPI spec or ai-plugin manifest was found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/14","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/payments/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and all docs pages returned only 'Connect wallet' with no content. The actual functionality behind 'Premium API Access' at /api/v1/payments/14 is unclear — it doesn't map to any of the named endpoints on the landing page. Effectively a stub 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'/request':13,32 '0.02':12,31,73,141,195 '000':130 '0x8335':135 '20':129 '2913':136 '300':154 '402':124 '6':145 'Base network API' 'USDC micropayment API' 'accept':159 'access':120 'account':90 'across':58 'actual':216 'advertis':95,168 'ai-inference' 'ai/ml':61 'analysi':172 'analyt':60 'analytics-api' 'api':5,17,24,36,45,88,119 'application/json':164 'attach':98 'base':8,27,81,131,138 'behavior':217 'broad':50 'broader':166 'call':4,23 'caller':96 'catalog':51 'challeng':125 'classif':175 'connect':207 'content':213 'convers':187 'crawl':228 'crypto API access' 'data':59,64,189 'decim':146 'doc':201 'document':199 'embed':176 'enabl':44 'endpoint':57,69,112,158,169,223 'equal':140 'estim':184 'exact':151 'exchang':179 'feed':178 'finance-data' 'finance/web3':63 'gas':183 'generat':190 'geocod':185 'given':142 'header':103 'howev':198 'infer':62 'json-response' 'key':18,37,89 'limit':93 'list':116 'lowpaymentfee' 'lowpaymentfee.com':39 'materi':229 'micropayment endpoint' 'network':9,28,82 'no-api-key' 'no-auth API' 'offer':48 'page':200 'paid':76 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':102,108,148 'per':3,22,55,74 'platform':6,25,46,167 'point':197 'post':160 'post-method' 'premium':118 'price':71,177,196,202 'prompt':209 'proof':109 'protocol':86 'quot':182 'rate':92,180 'readm':203 'request':56,75,126,161 'requir':19,38 'respons':219 'return':122,163,204 'schema':220 'scheme':149 'second':155 'sentiment':171 'servic':67 'simpli':97 'specif':111 'substant':212 'summar':174 'text':173 'timeout':156 'token':181 'undocu':225 'unit':132 'usdc':15,34,78,134,143 'usdc-base-network' 'util':66 'utility-services' 'valid':106,186 'via':10,29,83 'wallet':208 'x':101 'x-payment':100 'x402':11,30,43,85,107 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c7d29da0-c412-497f-8f76-78516e28c8d5","listingId":"4c649e15-f18e-4f1a-a927-ebe15d083901","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/payments/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:25.143Z"}],"sources":[{"listingId":"4c649e15-f18e-4f1a-a927-ebe15d083901","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:25.143Z","lastSeenAt":"2026-04-23T05:01:21.628Z"}],"details":{"listingId":"4c649e15-f18e-4f1a-a927-ebe15d083901","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/14 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, scheme exact, 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/14"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use billing","Exporting analytics data or generating insights reports without subscription commitments"],"bestFor":["Agents and bots that need frictionless, keyless API access via crypto micropayments","Developers prototyping with multiple API categories without managing separate subscriptions","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Teams without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.991Z"},"updatedAt":"2026-04-23T05:01:21.628Z"}}