{"id":"ee2a02d8-5357-4b47-b486-7d3d00b0468a","shortId":"xRPtXD","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/346` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe wider site lists four endpoint 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 listed endpoints share the same $0.02/request pricing. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available — the docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no further content.\n\nBecause the endpoint at `/api/v1/payments/346` does not clearly map to any of the named services on the homepage, its exact functionality is uncertain. The x402 challenge confirms it is live, accepts POST requests, returns application/json, and settles via USDC (contract 0x8335…) on Base to address 0x1A2B…. Without documentation or sample responses, agents should treat this as a stub listing until more information becomes available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — docs, pricing, and README pages all show only 'Connect wallet'","The endpoint path /api/v1/payments/346 does not match any of the named API paths on the homepage; its exact functionality is unknown","No example request or response payloads are available to verify what the endpoint actually returns","All non-homepage crawled pages returned minimal content, suggesting documentation is not yet built out"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/346","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/346","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 confirms pricing and settlement details, but there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example requests or responses, and the specific endpoint path (/api/v1/payments/346) does not clearly correspond to any named service. Effectively a 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'/request':19,38,158 '0.02':18,37,86,157 '000':80 '0x1a2b':235 '0x8335':230 '20':79 '402 payment api' 'accept':220 'access':74,100 'address':234 'advertis':91 'agent':241 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,73,93 'application/json':224 'attach':103 'avail':171,253 'base':8,27,63,81,232 'base network api' 'becom':252 'broad':50 'call':4,23,88 'caller':101 'catalog':51 'categori':117 'challeng':215 'charg':76 'classif':132 'classification' 'clear':197 'confirm':216 'connect':183 'content':189 'contract':229 'convers':149 'cover':10,29 'data':11,30,118,122 'data-analytics' 'detail':164 'doc':173 'document':165,237 'embed':133 'embeddings' 'enabl':44 'endpoint':16,35,57,67,116,153,192 'estim':143 'exact':209 'exampl':167 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'finance-data' 'four':115 'function':210 'gas':142 'generat':150 'geocod':147 'geocoding' 'header':107 'homepag':207 'howev':160 'i.e':85 'inform':251 'infrastructur':145 'insight':124 'instant':99 'key':94 'label':71 'learn':127 'limit':97 'list':114,152,248 'live':219 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'map':198 'metric':120 'micropayment api' 'minim':182 'name':203 'network':64 'offer':48 'openapi':162 'page':177 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':169 'payment':106 'per':3,22,55,87 'platform':6,25,46,90 'post':221 'premium':72 'price':136,159,174 'prompt':185 'quot':141 'rate':96,139 'readm':176 'report':121 'request':56,110,222 'request/response':168 'resolv':179 'respons':240 'return':223 'sampl':239 'schema':163 'sentiment':128 'sentiment-analysis' 'servic':204 'settl':58,226 'share':154 'simpli':102 'site':113 'specif':66 'stub':247 'summar':131 'text':130 'text-summarization' 'token':140 'treat':243 'uncertain':212 'unit':82 'usdc':9,28,60,84,228 'usdc api' 'usdc-base' 'util':15,34,146 'utility-apis' 'valid':148 'via':227 'wallet':184 'web3':135 'wider':112 'without':236 'x402':43,105,214 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e77871c0-0f8a-43dd-904c-c3b197029820","listingId":"ee2a02d8-5357-4b47-b486-7d3d00b0468a","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/346","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:33.802Z"}],"sources":[{"listingId":"ee2a02d8-5357-4b47-b486-7d3d00b0468a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/346","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:33.802Z","lastSeenAt":"2026-04-23T04:01:32.875Z"}],"details":{"listingId":"ee2a02d8-5357-4b47-b486-7d3d00b0468a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/346 \\\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":"The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/346"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/346"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on demand","Exporting analytics data or generating insights reports with micro-payments"],"bestFor":["Agents or developers who want keyless, pay-as-you-go API access","Crypto-native workflows that can attach x402 USDC payments on Base","Low-volume or bursty usage patterns where per-request pricing beats subscriptions"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.785Z"},"updatedAt":"2026-04-23T04:01:32.875Z"}}