{"id":"90f0a40f-bd23-4580-8996-496bc2f3f46e","shortId":"aXNxxm","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/invoices/35` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers authenticate and pay via the x402 protocol's `X-PAYMENT` header.\n\nThe platform advertises four categories of endpoints: 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 are priced at $0.02 per request with no rate limits or minimum commitments.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/invoices/35` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual functionality behind \"Premium API Access\" is unclear from available materials.","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","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call API","USDC API","Base network API","crypto-paid API"],"warnings":["No documentation available — all doc/API/pricing/README pages show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/invoices/35 ('Premium API Access') is undefined in available materials","No examples of request bodies or response payloads anywhere in crawled content","Platform appears to be a demo or early-stage project with placeholder content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/35","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/invoices/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' at /api/v1/invoices/35 actually returns. All doc pages render only 'Connect wallet' with no 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'/request':19,38 '0.02':18,37,79,157 '000':83 '20':82 '6':89 'Base network API' 'USDC API' 'accept':217 'access':74,227 'account':95 'actual':222 'advertis':113 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,73,92,173,226 'authent':99 'avail':231 'base':8,27,63,84 'base-network' 'behind':224 'broad':50 'call':4,23,81 'caller':98 'catalog':51 'categori':115 'challeng':210 'charg':76 'classif':132 'commit':166 'confirm':211 'connect':182 'content':188 'convers':149 'crypto-paid API' 'data':11,30,118,122 'data-analytics' 'decim':90 'descript':200 'detail':199 'doc':172 'document':167 'embed':133 'embeddings' 'enabl':44 'endpoint':16,35,57,67,117,153,205,213 'estim':143 'exampl':196 'exchang':138 'export':123 'extrem':169 'feed':137 'financ':13,32,134 'finance-data' 'four':114 'function':223 'gas':142 'generat':150 'geocod':147 'geocoding' 'header':110 'infrastructur':145 'insight':124 'key':93 'label':71 'learn':127 'limit':163 'list':152 'live':215 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'materi':232 'metric':120 'micropayment API' 'minimum':165 'network':64 'no-api-key' 'offer':10,29 'openapi':192 'page':177 'pay':2,21,54,101 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':109 'per':3,22,55,80,158 'platform':6,25,46,112 'post':218 'premium':72,225 'price':136,155,174 'prompt':184 'protocol':105 'provid':48 'quot':141 'rate':139,162 'readm':176 'render':179 'report':121 'request':56,159,219 'request/response':195 'requir':97 'return':207 'schema':193 'sentiment':128 'sentiment-analysis' 'settl':58 'spars':170 'specif':66,206 'summar':131 'text':130 'text-summarization' 'token':140 'unclear':229 'unit':85 'usdc':9,28,60,87 'usdc-settlement' 'util':15,34,146 'utility-apis' 'valid':148 'via':102 'wallet':183 'web3':135 'x':108 'x-payment':107 'x402':43,104,209 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"df04f8b4-30be-4542-9a8f-b3070c677234","listingId":"90f0a40f-bd23-4580-8996-496bc2f3f46e","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/invoices/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:16.154Z"}],"sources":[{"listingId":"90f0a40f-bd23-4580-8996-496bc2f3f46e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:16.154Z","lastSeenAt":"2026-04-23T16:06:40.142Z"}],"details":{"listingId":"90f0a40f-bd23-4580-8996-496bc2f3f46e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/35 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint charges up to 20,000 base units of USDC (asset 0x8335…) on Base, which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/invoices/35"},{"claim":"All listed 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 platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding and validation without rate limits or subscriptions"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle payments via x402 on Base","Projects needing low-cost micropayment-settled API calls without accounts"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring guaranteed SLAs or enterprise support","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.443Z"},"updatedAt":"2026-04-23T16:06:40.142Z"}}