{"id":"74179d04-4f69-405f-a1c4-20c2528baaf5","shortId":"sJ9BGG","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/130` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of APIs: 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 listed at the same $0.02/request price point and settle payments to a single wallet address on Base.\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 documentation for any endpoint. The purpose and behavior of the specific `/api/v1/stripe/charges/130` endpoint is unclear from the available material; the name suggests it may relate to Stripe charge operations, but no schema or documentation confirms this.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","usdc api","base network api","stripe charges api"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or input/output schema provided for any endpoint","The purpose of /api/v1/stripe/charges/130 is unclear; 'Premium API Access' is a generic label","Cannot verify what data or service this endpoint actually returns","Platform appears to be a demo or early-stage project with many advertised endpoints but no substantive docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/130","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/stripe/charges/130","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint is ambiguous. Docs pages return only 'Connect wallet' with no 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'/request':17,36,157 '0.02':16,35,78,156 '000':82 '20':81 '6':88 'access':49,75 'address':167 'advertis':111 'ai':10,29,123 'ai-inference' 'analysi':127 'analyt':117 'api':4,23,45,74,99,115,176 'avail':220 'base':7,26,63,83,169 'base network api' 'base-network' 'behavior':210 'behind':55 'broader':109 'call':80 'categori':113 'charg':230 'classif':130 'confirm':237 'connect':185 'content':191 'convers':147 'cost':77 'data':9,28,116,120 'data-analytics' 'decim':89 'detail':202 'doc':175 'document':170,203,236 'embed':131 'endpoint':14,33,54,67,150,206,215 'estim':141 'exact':96 'exampl':199 'exchang':136 'export':121 'extrem':172 'feed':135 'financ':11,30,132 'finance-data' 'four':112 'gas':140 'gate':3,22,48 'generat':148 'geocod':145 'infrastructur':143 'insight':122 'key':100 'learn':125 'limit':103 'list':71,152 'low payment fee' 'lowpaymentfee.com':39 'machin':124 'made':92 'marketplac':46 'materi':221 'may':226 'metric':118 'micropay':60 'micropayment api' 'name':223 'network':64 'no-api-key' 'offer':8,27 'openapi':195 'oper':231 'page':180 'pay-per-request api' 'payment':90,162 'per':57,79 'per-request':56 'per-request-billing' 'platform':5,24,110 'point':159 'premium':73 'price':134,158,177 'prompt':187 'protocol':44 'purpos':208 'quot':139 'rate':102,137 'readm':179 'relat':227 'render':182 'report':119 'request':58 'request/response':198 'requir':107 'schema':196,234 'scheme':97 'sentiment':126 'settl':161 'singl':165 'spars':173 'specif':66,213 'stripe':229 'stripe charges api' 'subscript':106 'suggest':224 'summar':129 'text':128 'token':138 'unclear':217 'unit':84 'usdc':19,38,59,86 'usdc api' 'usdc-micropayment' 'util':13,32,144 'utility-services' 'valid':146 'varieti':52 'via':18,37,93 'wallet':166,186 'web3':133 'x402':2,21,43,95 'x402 api' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"b5dc850e-8f6c-4301-b37d-e2b926eac9dd","listingId":"74179d04-4f69-405f-a1c4-20c2528baaf5","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/stripe/charges/130","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:59.203Z"}],"sources":[{"listingId":"74179d04-4f69-405f-a1c4-20c2528baaf5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/130","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:59.203Z","lastSeenAt":"2026-04-22T20:01:24.421Z"}],"details":{"listingId":"74179d04-4f69-405f-a1c4-20c2528baaf5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/130 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/130"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for data analytics and reporting without managing API keys","Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) via micropayments","Fetching real-time crypto and finance data (prices, exchange rates, gas estimates) on demand","Using utility services like geocoding, validation, and conversion with no subscription"],"bestFor":["Agents or developers wanting zero-commitment, pay-as-you-go API access","x402-compatible wallets and AI agents on the Base network","Quick prototyping without API key management or rate limit concerns"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads where per-request pricing may not be cost-effective","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.785Z"},"updatedAt":"2026-04-22T20:01:24.421Z"}}