{"id":"4d66735e-2c98-4a29-882b-c5241e0642d4","shortId":"5ZZufH","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/214` 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. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show \"Connect wallet\"), so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt — no usable API docs exist.","The specific function of /api/v1/charges/214 ('Premium API Access') is not documented; it is unclear what data or service it provides.","No OpenAPI spec, request schemas, or response examples are available for any endpoint.","The breadth of advertised capabilities (AI, finance, geocoding, etc.) cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/214","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/214","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 pricing and payment details. However, documentation is essentially nonexistent — all doc pages render only \"Connect wallet\" with no schema, parameter, or response information. The specific purpose of /api/v1/charges/214 (\"Premium API Access\") is unclear and undifferentiated from the other endpoints. No request or response schemas are 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'/request':13,28 '0.02':12,27,62,121,175 '000':110 '0x8335':115 '20':109 '2913':116 '300':134 '402':104 '6':125 'Base network API' 'USDC micropayment API' 'accept':139 'access':100 'across':45 'actual':196 'advertis':148 'ai-inference' 'ai/ml':48 'analysi':152 'analyt':47 'api':5,20,37,72,99 'application/json':144 'attach':82 'base':8,23,69,111,118 'base-network' 'beyond':180 'broader':146 'call':4,19 'caller':80 'challeng':105 'classif':155 'classification' 'connect':192 'convers':167 'crypto-paid API' 'data':46,169 'data-analytics' 'decim':126 'doc/pricing/api':188 'document':179 'embed':156 'embeddings' 'empti':186 'enabl':36 'endpoint':44,55,92,138,149,201 'equal':120 'essenti':185 'estim':164 'exact':131 'exchang':159 'feed':158 'finance-data' 'finance/web3':50 'gas':163 'generat':170 'geocod':165 'geocoding' 'given':122 'header':86 'howev':178 'individu':200 'infer':49 'infrastructur':52 'key':73 'land':182 'limit':75 'list':96 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'network':9,24,70 'offer':40 'page':183,189 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':85,128 'per':3,18,59 'platform':6,21,38,147 'point':177 'post':140 'premium':98 'price':157,176 'quot':162 'rate':74,160 'request':60,89,106,141 'request/response':197 'requir':79 'return':102,143 'schema':198 'scheme':129 'second':135 'sentiment':151 'sentiment-analysis' 'settl':64 'show':191 'simpli':81 'specif':91 'subscript':77 'summar':154 'text':153 'text-summarization' 'timeout':136 'token':161 'unit':112 'unknown':203 'usdc':15,30,66,114,123 'usdc-settlement' 'util':53 'utility-services' 'valid':166 'varieti':42 'via':10,25 'wallet':193 'x402':11,26,35,84 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"568a0742-e9b2-40f8-8bb6-ed8f994709a9","listingId":"4d66735e-2c98-4a29-882b-c5241e0642d4","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/214","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:32.127Z"}],"sources":[{"listingId":"4d66735e-2c98-4a29-882b-c5241e0642d4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/214","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:32.127Z","lastSeenAt":"2026-04-23T10:00:47.909Z"}],"details":{"listingId":"4d66735e-2c98-4a29-882b-c5241e0642d4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/214 \\\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 priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settled in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/214"},{"claim":"Platform advertises endpoints for analytics, AI/ML, finance, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Geocoding and data validation utilities paid per request via USDC on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agent workflows that can attach x402 payment headers automatically","Projects already operating on the Base L2 network with USDC"],"notFor":["High-volume use cases where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation and request/response schemas before integrating","Teams without Base network USDC or x402-compatible tooling"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.118Z"},"updatedAt":"2026-04-23T10:00:47.909Z"}}