{"id":"784930a6-4e9e-4957-bf10-25d3b2daebfb","shortId":"qNbB4Q","kind":"x402","title":"Pay-per-request API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: 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 endpoints are priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint probed (/api/v1/orders/97) is labeled \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and the timeout is 300 seconds.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact purpose and response format of the /api/v1/orders/97 endpoint specifically is unclear; it may be an order-retrieval endpoint or a generic access gate. Without schemas or docs, agents must discover behavior empirically.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","analytics-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","data-export","gas-estimates"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee","402 payment api"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered empirically","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/orders/97 has no description beyond 'Premium API Access'; its input/output format is unknown","No request or response examples could be sourced"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/97","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/orders/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schemas, no documentation beyond a landing page catalog, and no examples. The specific endpoint's purpose is ambiguous. Effectively a stub 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'/api/v1/orders/97':113,222 '/call':19,38 '/docs':179 '/pricing':181 '/readme':183 '0.02':18,37,99,134 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':167 '20':128 '300':172 '402 payment api' '6':139 'access':118,238 'across':58 'addit':194 'address':165 'agent':244 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':11,30,62 'analytics-api' 'api':5,24,45,117,153 'avail':210 'base':8,27,107,130,142 'base usdc api' 'behavior':247 'broad':50 'catalog':51 'categori':60 'challeng':124 'classif':75 'classification' 'commit':161 'connect':189 'convers':92 'crawl':213 'data':61,65 'data-export' 'decim':140 'detail':196 'discov':246 'doc':243 'document':174,205 'embed':76 'embeddings' 'empir':248 'enabl':44 'endpoint':16,35,57,95,111,223,234 'estim':86 'exact':149,215 'exampl':209 'exchang':81 'export':66 'extrem':176 'feed':80 'financ':13,32,77 'finance-data' 'format':219 'four':59 'gas':85 'gas-estimates' 'gate':239 'generat':93 'generic':237 'geocod':90 'geocoding' 'infrastructur':88 'insight':67 'key':154 'label':115 'learn':70 'limit':157 'live':122 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':145 'may':228 'metric':63 'micropayment api' 'must':245 'network':108 'offer':48 'openapi':200 'order':232 'order-retriev':231 'page':184 'paid':102 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':143,164 'per':3,22,55,100 'platform':6,25,46 'premium':116 'price':79,97 'probe':112 'prompt':191 'purpos':216 'quot':84 'rate':82,156 'render':186 'report':64 'request':4,23,56,101,125 'request/response':203 'requir':162 'respons':218 'retriev':233 'return':120 'schema':204,241 'scheme':150 'second':173 'sentiment':71 'sentiment-analysis' 'sinc':136 'spars':177 'spec':201 'specif':110,224 'summar':74 'technic':195 'text':73 'text-summarization' 'timeout':170 'token':83 'unclear':226 'unit':131 'upfront':160 'usag':208 'usd':135 'usdc':104,133,137 'usdc-base' 'use':138 'util':15,34,89 'valid':91 'via':9,28,146 'wallet':190 'web3':78 'without':240 'x402':10,29,43,123,148 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f8789753-3065-450e-9a66-63a7ad2d43b7","listingId":"784930a6-4e9e-4957-bf10-25d3b2daebfb","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/orders/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:23.436Z"}],"sources":[{"listingId":"784930a6-4e9e-4957-bf10-25d3b2daebfb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:23.436Z","lastSeenAt":"2026-04-23T00:31:09.628Z"}],"details":{"listingId":"784930a6-4e9e-4957-bf10-25d3b2daebfb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/97 \\\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":"All endpoints are 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":"The x402 challenge for /api/v1/orders/97 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/97"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running analytics queries and exporting data with instant crypto micropayments","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Agents or developers who want instant, keyless API access paid per request in USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads needing SLAs, rate-limit guarantees, or detailed documentation","Users without USDC on the Base network or unfamiliar with x402 payment flows","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.846Z"},"updatedAt":"2026-04-23T00:31:09.628Z"}}