{"id":"e08e8d3f-07e8-45cc-8387-22e8c2b5dc5f","shortId":"g2VNzT","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/210` 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 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, documentation beyond the landing page is essentially empty (all sub-pages only show \"Connect wallet\"), so the actual request/response schemas, supported parameters, and data sources for each endpoint are unknown.\n\nThe `/api/v1/payments/210` endpoint returned a valid x402 challenge (HTTP 402) confirming it is live. It accepts POST requests, settles via the \"exact\" scheme on Base using USDC (contract 0x8335…2913), and pays to address 0x1A2B…85F3 with a 300-second timeout. Because no OpenAPI spec, example payloads, or detailed docs were found, the actual functionality behind this specific endpoint remains opaque.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding"],"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":["All documentation pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no actual content.","No OpenAPI or schema available — request and response formats are unknown.","The specific purpose of /api/v1/payments/210 ('Premium API Access') is unclear; it does not map to any of the named endpoints on the landing page.","No evidence of the actual data sources, model providers, or service quality behind any listed endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/210","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/210","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (valid 402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no examples, and all documentation pages are empty stubs. The actual functionality of the /api/v1/payments/210 'Premium API Access' endpoint is completely 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'/request':19,38,157 '0.02':18,37,86,156 '000':80 '0x1a2b':225 '0x8335':219 '20':79 '2913':220 '300':229 '402':200 '402 payment api' '85f3':226 'accept':206 'access':74,100 'actual':178,244 'address':224 'advertis':91 'ai':12,31,124 'ai-inference' 'analysi':128 'analyt':118 'api':5,24,45,73,93 'attach':103 'base':8,27,63,81,215 'base network api' 'base-network' 'behind':246 'beyond':161 'broad':50 'call':4,23,88 'caller':101 'catalog':51 'categori':116 'challeng':198 'charg':76 'classif':131 'confirm':201 'connect':174 'contract':218 'convers':148 'data':11,30,117,121,184 'data-analytics' 'detail':239 'doc':240 'document':160 'embed':132 'embeddings' 'empti':167 'enabl':44 'endpoint':16,35,57,67,115,152,188,193,249 'essenti':166 'estim':142 'exact':212 'exampl':236 'exchang':137 'export':122 'feed':136 'financ':13,32,133 'finance-data' 'found':242 'four':114 'function':245 'gas':141 'generat':149 'geocod':146 'geocoding' 'header':107 'howev':159 'http':199 'i.e':85 'infrastructur':144 'insight':123 'instant':99 'key':94 'label':71 'land':163 'learn':126 'limit':97 'list':113,151 'live':204 'low payment fee' 'lowpaymentfee.com':39 'machin':125 'metric':119 'micropayment api' 'network':64 'no-api-key' 'offer':10,29 'opaqu':251 'openapi':234 'page':164,171 'paramet':182 'pay':2,21,54,222 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':237 'payment':106 'per':3,22,55,87 'platform':6,25,46,90 'post':207 'premium':72 'price':135,158 'provid':48 'quot':140 'rate':96,138 'remain':250 'report':120 'request':56,110,208 'request/response':179 'return':194 'schema':180 'scheme':213 'second':230 'sentiment':127 'sentiment-analysis' 'settl':58,209 'share':153 'show':173 'simpli':102 'site':112 'sourc':185 'spec':235 'specif':66,248 'sub':170 'sub-pag':169 'summar':130 'support':181 'text':129 'text-summarization' 'timeout':231 'token':139 'unit':82 'unknown':190 'usdc':9,28,60,84,217 'usdc api' 'usdc-settlement' 'use':216 'util':15,34,145 'valid':147,196 'via':210 'wallet':175 'web3':134 'x402':43,105,197 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b65ae103-266e-4544-b89d-71b52e4dbba1","listingId":"e08e8d3f-07e8-45cc-8387-22e8c2b5dc5f","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/210","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:51.775Z"}],"sources":[{"listingId":"e08e8d3f-07e8-45cc-8387-22e8c2b5dc5f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/210","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:51.775Z","lastSeenAt":"2026-04-23T05:01:22.647Z"}],"details":{"listingId":"e08e8d3f-07e8-45cc-8387-22e8c2b5dc5f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/210 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/210"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract used is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/210"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto gas estimates or token quotes with per-call payment","Geocoding or data validation as a utility microservice settled in USDC","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, keyless API access","Low-volume or bursty workloads where per-request pricing is economical"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation or OpenAPI schemas before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.744Z"},"updatedAt":"2026-04-23T05:01:22.647Z"}}