{"id":"98821b87-bdab-497f-83fa-d8770cefedc5","shortId":"BsY62h","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/161` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call. 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 endpoints: 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 the same USDC contract (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) 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 specific functionality behind the `/api/v1/stripe/charges/161` path is unclear; the name suggests it may relate to Stripe charge data, but this cannot be confirmed from available materials. The endpoint is live and returns a valid x402 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","pay-per-use"],"categories":["api-marketplace","finance","ai"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","USDC API access","pay-per-call API","Base network API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema available for any endpoint.","The specific purpose of /api/v1/stripe/charges/161 ('Premium API Access') is not documented — it is unclear what data or service it provides.","No request or response examples are available anywhere on the site.","The platform lists many endpoint categories (AI, finance, data, utils) but none have documented input/output contracts."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/161","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is effectively nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of this specific endpoint (/api/v1/stripe/charges/161) is unclear. Pricing is clear ($0.02 USDC) but nothing else can be 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'/api/v1/stripe/charges/161':69,216 '/docs':179 '/pricing':181 '/readme':183 '/request':17,36,160 '0.02':16,35,89,159 '000':84 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':171 '20':83 '402':247 'Base network API' 'USDC API access' 'access':49,75 'advertis':114 'ai':10,29,126 'analysi':130 'analyt':120 'api':4,23,45,74,102 'avail':236 'base':7,26,63,85,173 'base-network' 'behind':55,214 'broader':112 'call':92 'cannot':232 'categori':116 'challeng':248 'charg':228 'classif':133 'confirm':234 'connect':189 'content':195 'contract':170 'convers':150 'data':9,28,119,123,229 'detail':206 'document':174,207 'embed':134 'endpoint':14,33,54,67,118,153,210,239 'estim':144 'exact':99 'exampl':203 'exchang':139 'export':124 'extrem':176 'feed':138 'financ':11,30,135 'four':115 'function':213 'gas':143 'gate':3,22,48 'generat':151 'geocod':148 'infrastructur':146 'insight':125 'key':103 'learn':128 'limit':106 'list':71,155 'live':241 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':127 'made':95 'marketplac':46 'materi':237 'may':224 'metric':121 'micropay':60 'micropayment API' 'name':221 'network':64 'no-api-key' 'offer':8,27 'openapi':199 'page':184 'path':217 'pay-per-call API' 'pay-per-use' 'payment':79,93,165 'per':57,91 'per-request':56 'per-request-billing' 'platform':5,24,113 'point':162 'premium':73 'price':137,161 'prompt':191 'protocol':44 'quot':142 'rate':105,140 'relat':225 'render':186 'report':122 'request':58 'request/response':202 'requir':77,110 'return':243 'schema':200 'scheme':100 'sentiment':129 'settl':164 'spars':177 'specif':66,212 'stripe':227 'subscript':109 'suggest':222 'summar':132 'text':131 'token':141 'unclear':219 'unit':86 'usd':90 'usdc':19,38,59,88,169 'usdc-micropayment' 'util':13,32,147 'valid':149,245 'varieti':52 'via':18,37,96 'wallet':190 'web3':136 'x402':2,21,43,98,246 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"e6e6b2ac-3702-4741-a950-49e415cbf610","listingId":"98821b87-bdab-497f-83fa-d8770cefedc5","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:08.920Z"}],"sources":[{"listingId":"98821b87-bdab-497f-83fa-d8770cefedc5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/161","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:08.920Z","lastSeenAt":"2026-04-22T15:01:52.938Z"}],"details":{"listingId":"98821b87-bdab-497f-83fa-d8770cefedc5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/161 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/161"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/161"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Accessing data analytics, AI inference, or financial data endpoints via crypto micropayments","Integrating x402-compatible agents with utility and infrastructure APIs"],"bestFor":["Developers who want keyless, pay-per-use API access settled in USDC on Base","AI agents using x402 protocol for autonomous API consumption","Prototyping or low-volume usage where $0.02/request is cost-effective"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users who need fiat-only payment methods with no crypto wallet","High-volume consumers needing bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.256Z"},"updatedAt":"2026-04-22T15:01:52.938Z"}}