{"id":"cb28348e-b0b2-4210-b4c8-45c71503097d","shortId":"3wx5KF","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/33` is listed as \"Premium API Access\" and requires up to $0.02 in USDC (maxAmountRequired of 20,000 base units with 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions are needed.\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 address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual behavior and response format of this specific endpoint remain unknown.","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 — /docs, /pricing, /api, and /README pages all return only a 'Connect wallet' prompt with no content.","No OpenAPI or JSON schema describing request parameters or response format for this endpoint.","The purpose of '/api/v1/stripe/charges/33' is unclear — the name suggests Stripe charge creation but no details are provided.","Cannot verify what data or service this endpoint actually returns upon successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/33","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific 'Premium API Access' endpoint is undocumented. Effectively a stub 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'/api/v1/stripe/charges/33':69 '/docs':183 '/pricing':184 '/readme':187 '/request':17,36,163 '0.02':16,35,80,92,162 '000':86 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':171 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':175 '20':85 '402':225 '6':90 'USDC api' 'access':49,75 'actual':230 'address':170 'advertis':117 'ai':10,29,129 'ai-inference' 'analysi':133 'analyt':123 'api':4,23,45,74,104,121 'avail':213 'base':7,26,63,87,177 'base network api' 'base-network' 'behavior':231 'behind':55 'broader':115 'call':94 'categori':119 'challeng':227 'classif':136 'confirm':220 'connect':193 'content':199 'contract':174 'convers':153 'crawl':216 'data':9,28,122,126 'data-analytics' 'decim':91 'document':178,208 'embed':137 'endpoint':14,33,54,67,156,218,238 'estim':147 'exact':101 'exampl':212 'exchang':142 'export':127 'extrem':180 'feed':141 'financ':11,30,138 'finance-data' 'format':234 'four':118 'gas':146 'gate':3,22,48 'generat':154 'geocod':151 'infrastructur':149 'insight':128 'key':105 'learn':131 'limit':108 'list':71,158 'live':221 'low payment fee' 'lowpaymentfee.com':39 'machin':130 'made':97 'marketplac':46 'maxamountrequir':83 'metric':124 'micropay':60 'micropayment api' 'need':113 'network':64 'no-api-key' 'offer':8,27 'openapi':203 'page':188 'pay-per-request api' 'payment':95,168 'per':57,93 'per-request':56 'per-request-billing' 'platform':5,24,116 'point':165 'premium':73 'price':140,164 'prompt':195 'proper':224 'protocol':44 'quot':145 'rate':107,143 'remain':239 'render':190 'report':125 'request':58 'request/response':206 'requir':77 'respons':233 'return':222 'schema':207 'scheme':102 'sentiment':132 'settl':167 'spars':181 'spec':204 'specif':66,237 'stripe charges api' 'subscript':111 'summar':135 'text':134 'token':144 'unit':88 'unknown':240 'usag':211 'usdc':19,38,59,82,173 'usdc-micropayment' 'use':172 'util':13,32,150 'utility-services' 'valid':152 'varieti':52 'via':18,37,98 'wallet':194 'web3':139 'x402':2,21,43,100,226 'x402 api' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"ac7bd801-5223-4ac9-99f0-a976cc4f3361","listingId":"cb28348e-b0b2-4210-b4c8-45c71503097d","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:21.647Z"}],"sources":[{"listingId":"cb28348e-b0b2-4210-b4c8-45c71503097d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:21.647Z","lastSeenAt":"2026-04-22T18:32:09.559Z"}],"details":{"listingId":"cb28348e-b0b2-4210-b4c8-45c71503097d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/33 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/33"},{"claim":"All listed APIs 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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/33"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Micropayment-gated data retrieval for analytics, finance, or AI tasks","Programmatic access to utility services like geocoding or data conversion with crypto settlement"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads requiring predictable fiat billing","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.759Z"},"updatedAt":"2026-04-22T18:32:09.559Z"}}