{"id":"7e2991e2-eab9-4337-bfb4-873d09a52c8b","shortId":"ekPQBY","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-enabled API platform that exposes a variety of endpoints across four categories: 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 pay-per-call at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/carts/4` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 units (in the USDC token's smallest denomination) on Base. It accepts POST requests and responds with `application/json`. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an `X-PAYMENT` header to authenticate.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual behavior and response format of `/api/v1/carts/4` (or any other endpoint) is unknown beyond what the 402 challenge reveals.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The endpoint path '/api/v1/carts/4' does not match any of the advertised API categories on the landing page — its actual function is unknown","No examples of request bodies or response payloads available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/4","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/4","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, and the landing page lists available endpoints with pricing. However, there is no OpenAPI schema, no request/response examples, no meaningful documentation (all doc pages show only 'Connect wallet'), and the specific purpose of /api/v1/carts/4 is unclear. This is effectively a stub 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'/request':17,34 '0.02':16,33,93 '000':127 '20':126 '402':121,226 '402 payment api' 'accept':139 'access':117 'across':49 'actual':210 'addit':192 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':53 'api':4,21,41,116,156,178 'application/json':145 'attach':164 'authent':171 'base':7,24,101,137 'base network api' 'behavior':211 'beyond':223 'call':91 'caller':162 'categori':51 'challeng':122,227 'classif':66 'classification' 'connect':187 'content':193 'convers':83 'conversion' 'crypto-quotes' 'data':9,26,52,56 'data-analytics' 'denomin':135 'detail':204 'doc':177 'document':172,205 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,48,86,109,208,220 'estim':77 'exact':152 'exampl':201 'exchang':72 'export':57 'expos':44 'extrem':174 'feed':71 'financ':11,28,68 'finance-data' 'format':214 'four':50 'gas':76 'gate':3,20 'generat':84 'geocod':81 'geocoding' 'header':169 'infrastructur':79 'insight':58 'key':157 'learn':61 'limit':160 'list':113 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':148 'metric':54 'micropayment api' 'network':102 'offer':8,25 'openapi':197 'page':182 'pay':89 'pay per call api' 'pay-per-cal':88 'pay-per-request' 'payment':146,168 'per':90,94 'platform':5,22,42 'post':140 'premium':115 'price':70,179 'prompt':189 'protocol':106 'quot':75 'rate':73,159 'readm':181 'render':184 'report':55 'request':95,123,141 'request/response':200 'requir':161 'respond':143 'respons':213 'return':119 'reveal':228 'schema':198 'scheme':153 'sentiment':62 'sentiment-analysis' 'settl':96 'simpli':163 'smallest':134 'spars':175 'specif':108 'summar':65 'text':64 'text-summarization' 'token':74,132 'unit':128 'unknown':222 'usdc':98,131 'usdc api' 'usdc-base' 'util':13,30,80 'valid':82 'validation' 'varieti':46 'via':103,149 'wallet':188 'web3':69 'x':167 'x-payment':166 'x402':2,19,39,105,151 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"1c23d2a7-53b5-47c2-bbb0-4d311c4b8bac","listingId":"7e2991e2-eab9-4337-bfb4-873d09a52c8b","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:11.707Z"}],"sources":[{"listingId":"7e2991e2-eab9-4337-bfb4-873d09a52c8b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:11.707Z","lastSeenAt":"2026-04-23T20:01:20.871Z"}],"details":{"listingId":"7e2991e2-eab9-4337-bfb4-873d09a52c8b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/4 \\\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, no rate limits, settled on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge returns maxAmountRequired of 20000 in USDC on Base with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/carts/4"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/4"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto gas estimates or token quotes via micropayment","Geocoding or data validation as a utility service with no subscription commitment","Exporting analytics data or generating reports on a per-request billing model"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost API calls settled on Base","Web3-native applications that prefer on-chain payment over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T10:02:46.374Z"},"updatedAt":"2026-04-23T20:01:20.871Z"}}