{"id":"4f7ac389-fb98-41a2-aaa6-bd79fad0242b","shortId":"dKj5gH","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-enabled API marketplace that exposes a variety of endpoints across four categories: Data & Analytics (metrics, reports, 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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/carts/65` is listed as \"Premium API Access\" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The purpose of the `/api/v1/carts/65` endpoint specifically is unclear; the name \"Premium API Access\" and the cart-style URL suggest it may be a shopping cart or order resource rather than one of the advertised analytics/AI/finance endpoints. Without further documentation, the exact input parameters and response format cannot be determined.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API gateway","USDC micropayment API","Base network API","low fee API","crypto-paid API","402 payment API"],"warnings":["No API documentation available; /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific endpoint /api/v1/carts/65 ('Premium API Access') has an unclear purpose — 'carts/65' suggests a shopping cart resource rather than one of the advertised API categories","Cannot verify that the advertised AI, analytics, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/65","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/carts/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, documentation is effectively absent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/carts/65 is unclear. The listing is largely a 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'/api/v1/carts/65':116,215 '/docs':179 '/pricing':180 '/readme':183 '/request':17,36 '0.02':16,35,93,144 '000':133 '0x8335':138 '20':132 '2913':139 '300':160 '402 payment API' '6':148 'Base network API' 'USDC micropayment API' 'accept':165 'access':122,224 'across':53 'addit':194 'advertis':246 'ai':10,29,62 'ai-inference' 'analysi':66 'analyt':57 'analytics/ai/finance':247 'api':4,23,45,105,121,223 'application/json':170 'avail':210 'base':7,26,101,134,141 'beyond':172 'cannot':259 'cart':228,237 'cart-styl':227 'categori':55 'challeng':128 'classif':69 'classification' 'commit':110 'connect':189 'content':196 'convers':86 'crypto-paid API' 'data':9,28,56 'data-analytics' 'decim':149 'determin':261 'document':171,205,251 'embed':70 'embeddings' 'enabl':44 'endpoint':14,33,52,89,114,164,216,248 'equal':143 'estim':80 'exact':156,253 'exampl':208 'exchang':75 'export':60 'expos':48 'feed':74 'financ':11,30,71 'finance-data' 'format':258 'four':54 'gas':79 'gate':3,22 'generat':87 'geocod':84 'geocoding' 'given':145 'http':166 'infrastructur':82 'input':254 'insight':61 'key':106 'land':174 'learn':64 'limit':108 'list':118 'low fee API' 'lowpaymentfee.com':39 'machin':63 'made':152 'marketplac':46 'may':233 'metric':58 'name':221 'network':102 'offer':8,27 'one':243 'openapi':200 'order':239 'page':175,184 'paid':96 'paramet':255 'pay-per-call API' 'pay-per-request' 'payload':209 'payment':150 'per':94 'platform':5,24 'post':167 'premium':120,222 'price':73,91 'prompt':191 'purpos':212 'quot':78 'rate':76,107 'rather':241 'render':186 'report':59 'request':95,129 'request/response':203 'requir':111 'resourc':240 'respons':257 'return':124,169 'schema':204 'scheme':157 'second':161 'sentiment':65 'sentiment-analysis' 'shop':236 'spars':177 'spec':201 'specif':113,217 'standard':126 'style':229 'suggest':231 'summar':68 'technic':195 'text':67 'text-summarization' 'timeout':162 'token':77 'unclear':219 'unit':135 'url':230 'usdc':19,38,98,137,146 'usdc-base' 'util':13,32,83 'utility-apis' 'valid':85 'varieti':50 'via':18,37,153 'wallet':190 'web3':72 'without':249 'x402':2,21,43,127,155 'x402 API gateway' 'x402-enabled':42 'x402-gated':1,20 'x402-payment'","prices":[{"id":"fe20e0f9-50cd-4bc4-9696-2fad5e9fe48e","listingId":"4f7ac389-fb98-41a2-aaa6-bd79fad0242b","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/carts/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:35.499Z"}],"sources":[{"listingId":"4f7ac389-fb98-41a2-aaa6-bd79fad0242b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:35.499Z","lastSeenAt":"2026-04-23T15:00:45.422Z"}],"details":{"listingId":"4f7ac389-fb98-41a2-aaa6-bd79fad0242b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/65 \\\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":"All endpoints priced at $0.02/request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoints span Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/carts/65"},{"claim":"Payment settles to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/65"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries (metrics, reports, insights) with micropayment settlement on Base","Using utility services like geocoding, validation, and data conversion without subscriptions"],"bestFor":["Agents and developers who want keyless, pay-per-use API access settled in USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads needing SLAs, rate-limit guarantees, or dedicated support","Users without USDC on Base or unfamiliar with x402 payment flows","Anyone needing detailed API documentation or guaranteed schema stability"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.353Z"},"updatedAt":"2026-04-23T15:00:45.422Z"}}