{"id":"32773091-ac8b-459c-9910-5d1a640de687","shortId":"exq4wF","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 suite of 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 and settle in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/charges/47` is listed as \"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 handled via the x402 protocol's `exact` scheme — callers attach an `X-PAYMENT` header with a signed payment to the payTo address. No API keys or rate limits are advertised; access is instant once payment is included.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. 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","usdc-settlement","base-network","pay-per-request","no-api-key","sentiment-analysis","text-summarization","classification","embeddings","data-analytics","price-feeds","geocoding","gas-estimates"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","low fee API","crypto-paid API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific function of /api/v1/charges/47 ('Premium API Access') is ambiguous — unclear what it does beyond accepting payment","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/47","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/charges/47","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 (all show only 'Connect wallet'), there is no OpenAPI spec, no request/response schemas, and no examples. The specific purpose of /api/v1/charges/47 ('Premium API Access') is unclear — it may be a generic charge endpoint rather than a specific functional API. This is effectively a stub 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'/request':12,31 '0.02':11,30,95,135 '000':124 '0x8335':129 '20':123 '2913':130 '402':223 '6':139 'Base network API' 'USDC API' 'access':116,174 'across':54 'addit':201 'address':165 'advertis':118,173 'ai':15,34,64 'amount':121 'analysi':68 'analyt':58 'api':5,24,45,115,167,187 'attach':152 'avail':216 'base':8,27,104,125,132 'base-network' 'bodi':237 'broad':50 'call':4,23 'caller':151 'categori':56 'challeng':228 'classif':71 'classification' 'confirm':220 'connect':196 'content':202 'convers':88 'crypto-paid API' 'data':14,33,57,61 'data-analytics' 'decim':140 'doc':186 'document':181,211,231 'embed':72 'embeddings' 'enabl':44 'endpoint':19,38,53,91,108,218,240 'equal':134 'estim':82 'exact':149 'exampl':214 'exchang':77 'expect':241 'export':62 'extrem':183 'feed':76 'financ':16,35,73 'four':55 'gas':81 'gas-estimates' 'generat':89 'geocod':86 'geocoding' 'given':136 'handl':143 'header':157 'includ':180 'infrastructur':84 'insight':63 'instant':176 'key':168 'learn':66 'limit':171 'list':112 'live':221 'low fee API' 'lowpaymentfee.com':39 'machin':65 'max':120 'metric':59 'micropayment API' 'network':105 'no-api-key' 'offer':48 'openapi':206 'page':191 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payload':215 'payment':141,156,161,178 'payto':164 'per':3,22,96 'platform':6,25,46 'premium':114 'price':75,93,188 'price-feeds' 'prompt':198 'protocol':147 'quot':80 'rate':78,170 'readm':190 'render':193 'report':60 'request':97,236 'request/response':209 'respons':244 'return':222,246 'schema':210 'scheme':150 'sentiment':67 'sentiment-analysis' 'settl':99 'sign':160 'spars':184 'spec':207 'specif':107,239 'suit':51 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':234 'unit':126 'usdc':101,128,137 'usdc-settlement' 'util':18,37,85 'valid':87,226 'via':9,28,144 'wallet':197 'web3':74 'without':230 'x':155 'x-payment':154 'x402':10,29,43,146,227 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"38d68d71-762f-460c-a965-abc581999945","listingId":"32773091-ac8b-459c-9910-5d1a640de687","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/charges/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:24.165Z"}],"sources":[{"listingId":"32773091-ac8b-459c-9910-5d1a640de687","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:24.165Z","lastSeenAt":"2026-04-23T06:31:02.528Z"}],"details":{"listingId":"32773091-ac8b-459c-9910-5d1a640de687","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/47 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-token>\" \\\n  -d '{}'","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":"Endpoint returns 402 with x402 challenge requiring X-PAYMENT header, maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/47"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/47"},{"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 data analytics queries and exporting data with instant crypto-settled payments","Using utility services like geocoding and validation without rate limits or subscriptions"],"bestFor":["Agents and bots that need instant, keyless API access via crypto payments","Developers prototyping with low-cost per-request pricing on Base","Web3-native applications that prefer on-chain settlement over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where $0.02/request adds up significantly","Teams that require traditional authentication, SLAs, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.663Z"},"updatedAt":"2026-04-23T06:31:02.528Z"}}