{"id":"43c1bf6e-9558-4c2b-b0da-72abec5fc17c","shortId":"A6mu9h","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is a multi-category API platform that gates every endpoint behind the x402 payment protocol, settling in USDC on the Base network. The specific endpoint `/api/v1/carts/95` is listed as \"Premium API Access\" and requires up to 20,000 units of USDC (the asset at 0x8335… on Base, which has 6 decimals, so this equals $0.02) per call via the x402 \"exact\" scheme. No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises four endpoint families: 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 are priced at $0.02 per request. However, the specific endpoint probed here (`/api/v1/carts/95`) does not clearly map to any of these documented categories — its description is simply \"Premium API Access,\" and no further documentation about what it returns was found.\n\nDocumentation is extremely thin. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content accessible to a crawler. There is no OpenAPI spec, no request/response examples, and no detailed description of what the `/carts/95` endpoint actually does. The endpoint is confirmed live (402 challenge captured), but its actual functionality remains opaque.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","402 payment required API"],"warnings":["The specific endpoint /api/v1/carts/95 is not described in the site's listed API categories — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI schema, request format, or response examples are available.","The 'carts' path suggests an e-commerce or shopping-cart resource, but this is speculative."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/95","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/95","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 challenge, but there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of `/api/v1/carts/95` is unclear. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/carts/95':64,174 '/carts/95':243 '/docs':207 '/pricing':209 '/readme':211 '/request':16,34 '0.02':15,33,93,165 '000':76 '0x8335':83 '20':75 '402':252 '402 payment required API' '6':88 'Base network API' 'USDC pay-per-call' 'access':70,191,224 'actual':245,257 'advertis':108,125 'ai':9,27,135 'analysi':139 'analyt':8,26,130 'api':4,22,43,69,102,190 'asset':81 'attach':111 'base':7,25,59,85 'base-network' 'behind':49 'broader':123 'call':95 'caller':109 'captur':254 'categori':42,184 'challeng':253 'classif':142 'clear':177 'confirm':250 'connect':217 'content':223 'convers':159 'crawler':227 'data':129 'decim':89 'descript':186,239 'detail':238 'document':183,195,202 'embed':143 'endpoint':13,31,48,63,127,171,244,248 'equal':92 'estim':153 'everi':47 'exact':99 'exampl':235 'exchang':148 'export':133 'extrem':204 'famili':128 'feed':147 'financ':10,28,144 'found':201 'four':126 'function':258 'gas':152 'gate':3,21,46 'generat':160 'geocod':157 'header':116 'howev':168 'http-post' 'infrastructur':155 'insight':134 'json-response' 'key':103 'learn':137 'limit':106 'list':66 'live':251 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':136 'map':178 'metric':131 'micropayment API' 'multi':41 'multi-categori':40 'network':60 'no-api-key' 'opaqu':260 'openapi':231 'page':212 'pay-per-request' 'payment':52,115,120 'per':94,166 'platform':44,124 'premium':68,189 'price':146,163 'probe':172 'prompt':219 'proof':121 'protocol':53 'quot':151 'rate':105,149 'remain':259 'render':214 'report':132 'request':167 'request/response':234 'requir':72 'return':199 'scheme':100 'sentiment':138 'settl':54 'simpli':110,188 'spec':232 'specif':62,170 'substant':222 'suit':5,23 'summar':141 'text':140 'thin':205 'token':150 'unit':77 'usdc':18,36,56,79 'usdc-settlement' 'util':12,30,156 'valid':119,158 'via':17,35,96 'wallet':218 'web3':145 'x':114 'x-payment':113 'x402':2,20,51,98 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"1526b5e3-551d-4732-8946-5daa7d562647","listingId":"43c1bf6e-9558-4c2b-b0da-72abec5fc17c","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/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:16.489Z"}],"sources":[{"listingId":"43c1bf6e-9558-4c2b-b0da-72abec5fc17c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/95","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:16.489Z","lastSeenAt":"2026-04-24T13:31:32.211Z"}],"details":{"listingId":"43c1bf6e-9558-4c2b-b0da-72abec5fc17c","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Attach a valid X-PAYMENT header (USDC on Base, exact scheme) to access.\ncurl -X POST https://lowpaymentfee.com/api/v1/carts/95 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <base64-encoded-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, exact scheme, USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/carts/95"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Four API families are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Exploring x402 protocol integration for micropayment-gated services"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can sign USDC transactions on Base for per-call billing","Users who want keyless, commitment-free API access"],"notFor":["Anyone needing detailed documentation or guaranteed SLAs before integrating","Use cases requiring free or fiat-settled API access","Production workloads that depend on well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.162Z"},"updatedAt":"2026-04-24T13:31:32.211Z"}}