{"id":"456f9db5-6f3b-42ab-af1b-8b276b44e47c","shortId":"dJBpqw","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/144` is listed as \"Premium API Access\" and costs up to $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 per request price point. However, the specific functionality behind the `/api/v1/stripe/charges/144` path is not documented beyond the generic \"Premium API Access\" label, and the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause there is no OpenAPI schema, no request/response examples, and no detailed documentation for this specific endpoint, the actual input parameters and output format are unknown. The x402 challenge confirms the endpoint is live and accepting POST requests, but callers should be aware that the precise behavior of this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","USDC API access","Base network API"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","The specific functionality of /api/v1/stripe/charges/144 is completely undocumented; 'Premium API Access' is a generic label.","No OpenAPI schema or request/response examples are provided.","No input parameters or output format can be determined from available material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/144","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/144","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation for this specific endpoint — no schema, no examples, no description of what it actually does. The docs/pricing/README pages are all empty (just 'Connect wallet'). The endpoint name 'Premium API Access' is generic and 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'/request':17,34 '0.02':16,33,78,156 '000':82 '20':81 '6':88 'Base network API' 'USDC API access' 'accept':234 'access':45,73,177 'actual':217 'advertis':111 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,41,72,99,115,176,185 'awar':241 'base':7,24,61,83 'behavior':245 'behind':51,165 'beyond':172 'broader':109 'call':80 'caller':238 'categori':113 'challeng':227 'classif':130 'confirm':228 'connect':192 'content':198 'convers':147 'cost':75 'crawl':181 'data':9,26,116,120 'decim':89 'detail':210 'doc':184 'document':171,182,211 'embed':131 'endpoint':14,31,50,65,150,215,230,248 'estim':141 'exact':96 'exampl':207 'exchang':136 'export':121 'feed':135 'financ':11,28,132 'format':222 'four':112 'function':164 'gas':140 'gate':3,20,44 'generat':148 'generic':174 'geocod':145 'howev':161 'infrastructur':143 'input':218 'insight':122 'json-response' 'key':100 'label':178 'learn':125 'limit':103 'list':69,152 'live':232 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'made':92 'marketplac':42 'metric':118 'micropay':55 'micropayment API' 'network':62 'offer':8,25 'openapi':203 'output':221 'page':183 'paramet':219 'path':168 'pay-per-call API' 'payment':90 'per':53,79,157 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'point':160 'post':235 'post-endpoint' 'precis':244 'premium':71,175 'price':134,159,186 'prompt':194 'protocol':40 'quot':139 'rate':102,137 'readm':187 'report':119 'request':54,158,236 'request/response':206 'requir':107 'return':189 'schema':204 'scheme':97 'sentiment':126 'settl':56 'specif':64,163,214 'subscript':106 'substant':197 'summar':129 'text':128 'token':138 'undocu':250 'unit':84 'unknown':224 'usdc':58,86 'usdc-base' 'util':13,30,144 'valid':146 'varieti':48 'via':93 'wallet':193 'web3':133 'x402':2,19,39,95,226 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"e21de7e8-b4b8-400c-af7e-cac06ba3af17","listingId":"456f9db5-6f3b-42ab-af1b-8b276b44e47c","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/144","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:01.643Z"}],"sources":[{"listingId":"456f9db5-6f3b-42ab-af1b-8b276b44e47c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/144","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:01.643Z","lastSeenAt":"2026-04-22T20:01:24.538Z"}],"details":{"listingId":"456f9db5-6f3b-42ab-af1b-8b276b44e47c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/144 \\\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 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/144"},{"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":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/144"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402-compatible agents with on-chain micropayments for data or utility services","Accessing premium API functionality with USDC on Base"],"bestFor":["Developers or agents wanting key-free, pay-per-use API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who prefer no commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet or x402-capable client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.594Z"},"updatedAt":"2026-04-22T20:01:24.538Z"}}