{"id":"36beb4e9-73e3-4e22-a7f8-46283aefa0a5","shortId":"f6KNj8","kind":"x402","title":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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.\n\nThe specific endpoint at `/api/v1/policies/50` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base. Payment is handled via the x402 protocol's `exact` scheme — no API keys, accounts, or rate limits are required. The platform advertises instant access with no minimums or commitments.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The actual functionality behind `/api/v1/policies/50` (\"Premium API Access\") is unclear — it does not map to any of the named endpoints on the landing page, so its purpose must be inferred or tested directly.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay per call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto pay API","402 payment API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no useful content","No OpenAPI or schema available for any endpoint","The endpoint /api/v1/policies/50 ('Premium API Access') does not correspond to any of the named endpoints on the landing page — its actual functionality is unknown","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/50","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/policies/50","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, confirming it works. However, documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/policies/50 is unclear since it doesn't match any named endpoint on the landing page. The listing is effectively a 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'/call':19,38 '0.02':18,37,99,134 '000':129 '20':128 '402':123 '402 payment API' 'Base network API' 'USDC API' 'access':119,161,211 'account':151 'across':58 'actual':205 'addit':187 'advertis':159 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,118,149,173,210 'base':8,27,107,130,137 'behind':207 'broad':50 'catalog':51 'categori':60 'challeng':124 'classif':75 'classification' 'commit':166 'connect':182 'content':188 'convers':92 'crypto pay API' 'data':11,30,61,65 'data-analytics' 'detail':199 'direct':236 'doc':172 'document':167,200 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,203,223 'estim':86 'exact':146 'exampl':196 'exchang':81 'exchange-rates' 'export':66 'extrem':169 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':206 'gas':85 'gas-estimates' 'generat':93 'geocod':90 'geocoding' 'handl':140 'infer':233 'infrastructur':88 'insight':67 'instant':160 'key':150 'land':226 'learn':70 'limit':154 'list':115 'low fee API' 'lowpaymentfee.com':39 'machin':69 'map':217 'metric':63 'micropayment API' 'minimum':164 'must':231 'name':222 'network':108 'no-api-key' 'offer':48 'openapi':192 'page':177,227 'paid':102 'pay':2,21,54 'pay per call API' 'pay-per-request':1,20,53 'payment':138 'per':3,22,55,100 'platform':6,25,46,158 'premium':117,209 'price':79,97,174 'prompt':184 'protocol':144 'purpos':230 'quot':84 'rate':82,153 'readm':176 'render':179 'report':64 'request':4,23,56,101,125 'request/response':195 'requir':156 'return':121 'schema':193 'scheme':147 'sentiment':71 'sentiment-analysis' 'spars':170 'specif':110 'summar':74 'test':235 'text':73 'text-summarization' 'token':83 'unclear':213 'unit':131 'usd':135 'usdc':104,133 'usdc-base' 'util':15,34,89 'valid':91 'validation' 'via':9,28,141 'wallet':183 'web3':78 'x402':10,29,43,143 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e89e4a76-0b60-4d09-88c3-a676cec134d5","listingId":"36beb4e9-73e3-4e22-a7f8-46283aefa0a5","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/policies/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:08.628Z"}],"sources":[{"listingId":"36beb4e9-73e3-4e22-a7f8-46283aefa0a5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:08.628Z","lastSeenAt":"2026-04-23T00:32:01.342Z"}],"details":{"listingId":"36beb4e9-73e3-4e22-a7f8-46283aefa0a5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/50 \\\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 minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on the Base network via x402 exact scheme, maxAmountRequired 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis","Agent-driven workflows that need instant, keyless API access settled on Base"],"bestFor":["Developers and agents wanting frictionless, keyless API access","Crypto-native applications that can pay in USDC on Base","Low-volume or sporadic API usage where per-call pricing is cheaper than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users without a Base-compatible wallet or USDC holdings","Applications requiring detailed SLAs, documentation, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.086Z"},"updatedAt":"2026-04-23T00:32:01.342Z"}}