{"id":"d439c978-9232-4f33-904a-64b0e0ad08f2","shortId":"AzXcc5","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","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 via the x402 protocol.\n\nThe specific endpoint at /api/v1/payments/244 is labeled \"Premium API Access\" and advertises a max amount 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 no API keys or rate limits required — callers simply attach an X-PAYMENT header to each POST request. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what request body this specific endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","no-auth api","serverless api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) are all empty — only show 'Connect wallet'","No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/payments/244 is unclear — 'Premium API Access' is a generic label not matching any of the listed API categories","Request and response formats are unknown; example_request_json and example_response_json cannot be provided","The broad catalog claims (AI, finance, data, utilities) cannot be independently verified from the crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/244","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/244","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page lists available endpoints with pricing. However, documentation pages are empty (just 'Connect wallet'), there is no OpenAPI spec, no request/response schemas, and no examples. The specific purpose of /api/v1/payments/244 ('Premium API Access') is unclear beyond its label. This is effectively a stub 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'/api/v1/payments/244':117 '/docs':186 '/pricing':187 '/readme':190 '/request':12,31 '0.02':11,30,99,141 '000':130 '0x8335':135 '20':129 '2913':136 '300':179 '402':227 '6':145 'access':122 'across':58 'advertis':124 'ai':15,34,68 'ai-inference' 'amount':127 'analysi':72 'analyt':62 'api':5,24,45,121,157 'attach':165 'avail':216 'base':8,27,107,131,138 'base network api' 'bodi':241 'broad':50 'call':4,23 'caller':163 'catalog':51 'categori':60 'challeng':232 'classif':75 'confirm':224 'connect':196 'content':202 'convers':92 'conversion' 'crawl':219 'data':14,33,61,65 'data-analytics' 'decim':146 'document':181,211,235 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,95,115,222,244 'equal':140 'estim':86 'exact':153 'exampl':215 'exchang':81 'exchange-rates' 'expect':245 'export':66 'extrem':183 'feed':80 'financ':16,35,77 'finance-data' 'four':59 'gas':85 'gas-estimates' 'generat':93 'geocod':90 'geocoding' 'given':142 'header':170 'infrastructur':88 'insight':67 'key':158 'label':119 'learn':70 'limit':161 'live':225 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':149 'materi':220 'max':126 'metric':63 'micropayment api' 'network':108 'no-auth api' 'offer':48 'openapi':206 'page':191 'paid':102 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':147,169,176 'per':3,22,55,100 'platform':6,25,46 'post':173 'premium':120 'price':79,97 'prompt':198 'protocol':112 'quot':84 'rate':82,160 'render':193 'report':64 'request':56,101,174,240 'request/response':209 'requir':162 'respons':248 'return':226,250 'schema':210 'scheme':154 'second':180 'sentiment':71 'sentiment-analysis' 'serverless api' 'simpli':164 'spars':184 'spec':207 'specif':114,243 'summar':74 'text':73 'text-classification' 'text-summarization' 'timeout':177 'token':83 'unclear':238 'unit':132 'usag':214 'usdc':104,134,143 'usdc api' 'usdc-base' 'util':18,37,89 'valid':91,230 'validation' 'via':9,28,109,150 'wallet':197 'web3':78 'without':234 'x':168 'x-payment':167 'x402':10,29,43,111,152,231 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2d49a22d-c321-486d-a0f1-7d7926445c78","listingId":"d439c978-9232-4f33-904a-64b0e0ad08f2","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/244","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:05.102Z"}],"sources":[{"listingId":"d439c978-9232-4f33-904a-64b0e0ad08f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/244","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:05.102Z","lastSeenAt":"2026-04-23T03:31:32.267Z"}],"details":{"listingId":"d439c978-9232-4f33-904a-64b0e0ad08f2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/244 \\\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 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 x402 challenge for /api/v1/payments/244 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/244"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call payment basis without API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates via micropayments","Running data analytics queries (metrics, reports, insights) with pay-as-you-go pricing","Using utility services like geocoding, validation, and data conversion without subscription commitments"],"bestFor":["Agents or bots that need instant, keyless API access paid per request","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Teams without crypto wallets or USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.081Z"},"updatedAt":"2026-04-23T03:31:32.267Z"}}