{"id":"bd598956-90f6-491b-8997-4f76fbf30dc9","shortId":"PPJ7Ks","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/carts/16` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's uniform pricing. The endpoint accepts POST requests and returns application/json responses.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. Documentation pages (docs, pricing, README) appear to require wallet connection and contain no substantive content in the crawl. No OpenAPI schema, request/response examples, or detailed documentation were found, so the actual behavior and data returned by this specific cart endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base network api","usdc api","cart api"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Documentation, pricing, and README pages are wallet-gated and contain no crawlable content","The specific purpose and expected input/output of /api/v1/carts/16 is undocumented","The platform lists many endpoints but none have detailed docs visible without wallet connection"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/16","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/16","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 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and documentation pages are empty (wallet-gated). The purpose of the specific '/api/v1/carts/16' endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/call':13,28 '0.02':12,27,63,127,176 '000':111 '0x8335':116 '20':110 '2913':117 '402':105 '6':123 'accept':139 'access':101 'across':45 'actual':209 'advertis':149 'ai/ml':48 'analysi':153 'analyt':47 'api':5,20,37,73,100 'appear':184 'application/json':144 'attach':83 'base':8,23,70,112,119 'base network api' 'behavior':210 'broader':147 'call':129 'caller':81 'cart':217 'cart api' 'challeng':106 'classif':156 'connect':188 'consist':130 'contain':190 'content':193 'convers':168 'crawl':196 'data':46,51,170,212 'decim':124 'detail':203 'doc':181 'document':179,204 'embed':157 'enabl':36 'endpoint':44,56,93,138,150,218 'equal':126 'estim':165 'exampl':201 'exchang':160 'feed':159 'finance/web3':50 'found':206 'gas':164 'generat':171 'geocod':166 'header':87 'infer':49 'json-response' 'key':74 'limit':76 'list':97 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,71 'no-api-key' 'offer':40 'openapi':198 'page':180 'pay':2,17,59 'pay per call api' 'pay-per-request':1,16,58 'payment':86 'per':3,18,60,128 'platform':6,21,38,148 'point':178 'post':140 'post-method' 'premium':99 'price':136,158,177,182 'quot':163 'rate':75,161 'readm':183 'remain':219 'request':4,19,61,90,107,141 'request/response':200 'requir':80,186 'respons':145 'return':103,143,213 'schema':199 'sentiment':152 'servic':54 'settl':65 'simpli':82 'sinc':120 'site':133 'specif':92,216 'subscript':78 'substant':192 'summar':155 'text':154 'token':162 'unclear':220 'uniform':135 'unit':113 'usdc':15,30,67,115,121 'usdc api' 'usdc-base' 'use':122 'util':53 'valid':167 'varieti':42 'via':10,25 'wallet':187 'x402':11,26,35,85 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"82d279ca-b592-4d39-a219-6e25d8969234","listingId":"bd598956-90f6-491b-8997-4f76fbf30dc9","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:01.608Z"}],"sources":[{"listingId":"bd598956-90f6-491b-8997-4f76fbf30dc9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:01.608Z","lastSeenAt":"2026-04-23T16:30:38.441Z"}],"details":{"listingId":"bd598956-90f6-491b-8997-4f76fbf30dc9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/16 \\\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 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settled in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/16"},{"claim":"Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic purchasing or cart retrieval via x402 payment protocol"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to bulk plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.044Z"},"updatedAt":"2026-04-23T16:30:38.441Z"}}