{"id":"83f52322-5118-4c93-918d-bdc579733dd7","shortId":"MTxA2U","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/182` 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 are needed. The caller simply includes an X-PAYMENT header with a valid payment proof.\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 on the Base L2 network using USDC (contract 0x8335…2913).\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The specific functionality behind the `/api/v1/stripe/charges/182` path is unclear; the name \"Premium API Access\" and the path segment \"stripe/charges\" suggest it may relate to Stripe charge data or a payment-related operation, but this cannot be confirmed from available materials.","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","crypto-payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt with no technical content.","No OpenAPI or input/output schema provided; request format and response structure are unknown.","The endpoint path '/api/v1/stripe/charges/182' suggests Stripe charge data but the actual functionality is unconfirmed.","The 'Premium API Access' description is generic and does not explain what the endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/182","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/182","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of this endpoint is ambiguous. Effectively a stub 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'/api/v1/stripe/charges/182':67,233 '/docs':193 '/pricing':195 '/readme':197 '/request':17,36,173 '0.02':16,35,87,172 '000':82 '0x8335':186 '20':81 '2913':187 'Base network API' 'USDC API' 'access':73,241 'advertis':127 'ai':10,29,139 'ai-inference' 'analysi':143 'analyt':133 'api':4,23,45,72,100,131,240 'avail':224,267 'base':7,26,61,83,180 'base-network' 'behind':53,231 'broader':125 'call':90 'caller':111 'cannot':263 'categori':129 'charg':253 'classif':146 'confirm':265 'connect':203 'content':210 'contract':185 'convers':163 'crawl':227 'data':9,28,132,136,254 'data-analytics' 'document':188,219 'embed':147 'endpoint':14,33,52,65,166 'estim':157 'exact':97 'exampl':223 'exchang':152 'export':137 'extrem':190 'feed':151 'financ':11,30,148 'finance-data' 'four':128 'function':230 'gas':156 'gate':3,22,48 'generat':164 'geocod':161 'header':118 'includ':113 'infrastructur':159 'insight':138 'key':101 'l2':181 'learn':141 'limit':104 'list':69,168 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':140 'made':93 'marketplac':46 'materi':268 'may':249 'metric':134 'micropay':58 'micropayment API' 'name':238 'need':109 'network':62,182 'no-api-key' 'offer':8,27 'openapi':214 'oper':260 'page':198 'path':234,244 'pay-per-request API' 'payment':77,91,117,122,258 'payment-rel':257 'per':55,89 'per-request':54 'per-request-billing' 'platform':5,24,126 'point':175 'premium':71,239 'price':150,174 'prompt':205 'proof':123 'protocol':44 'quot':155 'rate':103,153 'relat':250,259 'render':200 'report':135 'request':56 'request/response':217 'requir':75 'schema':218 'scheme':98 'segment':245 'sentiment':142 'settl':177 'simpli':112 'spars':191 'spec':215 'specif':64,229 'stripe':252 'stripe/charges':246 'subscript':107 'suggest':247 'summar':145 'technic':209 'text':144 'token':154 'unclear':236 'unit':84 'usag':222 'usd':88 'usdc':19,38,57,86,184 'usdc-micropayment' 'use':183 'util':13,32,160 'utility-services' 'valid':121,162 'varieti':50 'via':18,37,94 'wallet':204 'web3':149 'x':116 'x-payment':115 'x402':2,21,43,96 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"8392c95f-d3fc-4684-a834-a7d63114b2a4","listingId":"83f52322-5118-4c93-918d-bdc579733dd7","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/182","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:05.253Z"}],"sources":[{"listingId":"83f52322-5118-4c93-918d-bdc579733dd7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/182","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:05.253Z","lastSeenAt":"2026-04-22T04:01:52.189Z"}],"details":{"listingId":"83f52322-5118-4c93-918d-bdc579733dd7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/182 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units (0.02 USD).","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/182"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/182"}],"useCases":["Accessing data analytics and reports without subscription commitments","Running AI inference (sentiment, summarization, classification, embeddings) on a pay-per-call basis","Fetching real-time finance and crypto market data with micropayments","Using utility services like geocoding and validation without API key management"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","Agent-based workflows that can settle payments via x402 on Base","Prototyping and low-volume use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request crypto payments add overhead","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.475Z"},"updatedAt":"2026-04-22T04:01:52.189Z"}}