{"id":"f486dd4b-4be4-4bf7-ad6d-9934465b6d59","shortId":"xsqLkS","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 a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/119` is listed as \"Premium API Access\" and accepts payment via the x402 exact scheme. The x402 challenge confirms it is live, accepting POST requests, and requires up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals).\n\nThe provider's landing page 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 listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payments settle on the Base L2 network.\n\nHowever, the specific endpoint being listed (`/api/v1/stripe/charges/119`) does not appear in the provider's public API catalog, and its purpose is unclear — the path suggests it may relate to Stripe charge operations, but no documentation or schema describes its input/output. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation, request/response schemas, or examples, the actual functionality of this particular endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-method"],"categories":["payments","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","stripe charges API"],"warnings":["The endpoint /api/v1/stripe/charges/119 is not listed in the provider's public API catalog — its actual functionality is unknown.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content.","No request or response schema is available; input/output format is entirely unknown.","The endpoint path references 'stripe/charges' which may imply Stripe payment operations, but this is unconfirmed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/119","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/119","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and confirms pricing and network, but the specific endpoint's purpose is undocumented. No request/response schema, no examples, and no meaningful documentation pages were found. The endpoint path does not match any publicly listed API on the provider's 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'/request':17,36 '0.02':16,35,108,164 '000':97 '0x8335':102 '20':96 '2913':103 '6':113 'Base network API' 'USDC API' 'accept':75,89 'access':73 'actual':250 'advertis':120 'ai':10,29,132 'analysi':136 'analyt':126 'api':4,23,45,72,124,169,200,227 'appear':194 'base':7,26,61,98,105,182 'base-network' 'behind':53 'call':110 'catalog':201 'categori':122 'challeng':84 'charg':215 'classif':139 'commit':177 'confirm':85 'connect':236 'content':242 'convers':156 'data':9,28,125,129 'decim':114 'describ':222 'doc':226 'document':219,244 'embed':140 'endpoint':14,33,52,65,160,188,255 'equal':107 'estim':150 'exact':80 'exampl':248 'exchang':145 'export':130 'feed':144 'financ':11,30,141 'four':121 'function':251 'gas':149 'gate':3,22,48 'generat':157 'geocod':154 'howev':185 'infrastructur':152 'input/output':224 'insight':131 'key':170 'l2':183 'land':118 'learn':134 'limit':173 'list':69,159,190 'live':88 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':133 'marketplac':46 'may':211 'metric':127 'micropay':58 'micropayment API' 'minimum':176 'network':62,184 'no-api-key' 'offer':8,27 'oper':216 'page':119,231 'particular':254 'path':208 'pay-per-request API' 'payment':76,178 'per':55,109,165 'per-request':54 'per-request-billing' 'platform':5,24 'post':90 'post-method' 'premium':71 'price':143,162,228 'prompt':238 'protocol':44 'provid':116,197 'public':199 'purpos':204 'quot':148 'rate':146,172 'readm':230 'relat':212 'remain':256 'report':128 'request':56,91,166 'request/response':245 'requir':93 'return':233 'schema':221,246 'scheme':81 'sentiment':135 'settl':179 'specif':64,187 'stripe':214 'stripe charges API' 'substant':241 'suggest':209 'summar':138 'text':137 'token':147 'unclear':206 'unit':99 'unknown':257 'usdc':19,38,57,101,111 'usdc-micropayment' 'use':112 'util':13,32,153 'valid':155 'varieti':50 'via':18,37,77 'wallet':237 'web3':142 'without':243 'x402':2,21,43,79,83 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"605c5287-1c19-4b9b-aa99-b2d59c83c4bb","listingId":"f486dd4b-4be4-4bf7-ad6d-9934465b6d59","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/119","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:48.918Z"}],"sources":[{"listingId":"f486dd4b-4be4-4bf7-ad6d-9934465b6d59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/119","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:48.918Z","lastSeenAt":"2026-04-22T21:31:17.558Z"}],"details":{"listingId":"f486dd4b-4be4-4bf7-ad6d-9934465b6d59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/119 \\\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 x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/119"},{"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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/119"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Integrating x402-compatible agents with low-cost data or utility endpoints","Programmatic micropayment-gated API consumption on Base L2"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Low-volume or bursty workloads where per-request pricing is economical"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads requiring predictable bulk pricing","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.251Z"},"updatedAt":"2026-04-22T21:31:17.558Z"}}