{"id":"94d01bd4-8416-415e-9f3b-734f902613c6","shortId":"rSCj3m","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 collection 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, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/charges/340` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 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. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the \"Premium API Access\" endpoint actually returns. The platform advertises many endpoints but provides almost no technical detail about inputs, outputs, or error handling for any of them.","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","crypto api access"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The specific purpose of the /api/v1/charges/340 'Premium API Access' endpoint is unclear; it does not map to any of the named endpoints on the homepage","No examples of actual API responses are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/340","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/340","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' actually returns. The listing is essentially a stub with confirmed 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'/request':19,38 '0.02':18,37,95,140 '000':129 '0x8335':134 '20':128 '2913':135 '402':123 '6':144 'accept':172 'access':119,216 'across':54 'actual':218 'advertis':222 'ai':12,31,64 'ai-inference' 'almost':227 'analysi':68 'analyt':58 'api':5,24,45,118,156,184,215 'application/json':177 'attach':164 'base':8,27,103,130,137 'base network api' 'broad':50 'call':4,23 'caller':162 'categori':56 'challeng':124 'classif':71 'classification' 'collect':51 'connect':193 'content':199 'convers':88 'crypto api access' 'data':11,30,57,61 'data-analytics' 'decim':145 'descript':210 'detail':230 'doc':183 'document':178 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,171,217,224 'equal':139 'error':235 'estim':82 'exact':152 'exampl':207 'exchang':77 'export':62 'extrem':180 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'geocod':86 'geocoding' 'given':141 'handl':236 'header':169 'infrastructur':84 'input':232 'insight':63 'key':157 'learn':66 'limit':160 'list':115 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':148 'mani':223 'metric':59 'micropayment api' 'network':104 'offer':10,29 'openapi':203 'output':233 'page':188 'paid':98 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':146,168 'per':3,22,96 'platform':6,25,46,221 'post':173 'premium':117,214 'price':75,93,185 'prompt':195 'protocol':108 'provid':48,226 'quot':80 'rate':78,159 'readm':187 'render':190 'report':60 'request':97,125,174 'request/response':206 'requir':161 'return':121,176,219 'schema':204 'scheme':153 'sentiment':67 'sentiment-analysis' 'simpli':163 'spars':181 'specif':110 'substant':198 'summar':70 'technic':229 'text':69 'text-summarization' 'token':79 'unit':131 'usdc':9,28,100,133,142 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,149 'wallet':194 'web3':74 'x':167 'x-payment':166 'x402':43,107,151 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f62198a6-d860-4849-8c34-6b734a8795e7","listingId":"94d01bd4-8416-415e-9f3b-734f902613c6","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/340","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:16.362Z"}],"sources":[{"listingId":"94d01bd4-8416-415e-9f3b-734f902613c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/340","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:16.362Z","lastSeenAt":"2026-04-23T08:01:18.614Z"}],"details":{"listingId":"94d01bd4-8416-415e-9f3b-734f902613c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/340 \\\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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/340"},{"claim":"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 management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agents that can settle x402 payments in USDC on Base","Projects needing lightweight access to multiple API categories without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads where $0.02/request adds up significantly","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.031Z"},"updatedAt":"2026-04-23T08:01:18.614Z"}}