{"id":"40824a45-978e-4662-9276-0c78d26ca398","shortId":"bwse2D","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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 payment challenge is handled inline: callers attach an X-PAYMENT header to settle each request on-chain.\n\nThe specific endpoint at `/api/v1/carts/50` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). The payment scheme is \"exact\" with a 300-second timeout, settling to address 0x1A2B…85F3. The endpoint accepts HTTP POST and returns application/json.\n\nWhile the landing page advertises many endpoint categories (sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, etc.), the crawled documentation pages were essentially empty (showing only a \"Connect wallet\" prompt). No OpenAPI spec, request/response schemas, or usage examples were found. The actual functionality behind `/api/v1/carts/50` is unclear — the name suggests a shopping cart resource but the description is generic. Treat this as a live but under-documented endpoint.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-platform","web3"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API gateway","402 payment required"],"warnings":["Documentation pages are empty (only show 'Connect wallet' prompt) — no request/response schemas available","The purpose of /api/v1/carts/50 is unclear; 'Premium API Access' is a generic label with no specifics","No OpenAPI specification or example payloads found","The broader catalog of endpoints (AI, analytics, finance, utils) is advertised but none were individually verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/50","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/50","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 confirmed) and pricing is clear ($0.02 USDC on Base), but documentation is essentially nonexistent — all doc/pricing/API pages render only a wallet-connect prompt. No OpenAPI spec, no request/response schemas, and the specific purpose of /api/v1/carts/50 is unclear beyond the generic 'Premium API Access' 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'/call':13,28 '0.02':12,27,59,132 '000':121 '0x1a2b':146 '0x8335':126 '20':120 '2913':127 '300':140 '402':115 '402 payment required' '6':130 '85f3':147 'Base network API' 'USDC pay-per-call' 'accept':150 'access':111 'actual':199 'address':145 'advertis':160 'ai/ml':49 'analysi':165 'analyt':48 'api':5,20,37,71,110 'application/json':155 'attach':88 'base':8,23,67,122,129 'behind':201 'broad':42 'caller':87 'cart':210 'catalog':43 'categori':163 'chain':100 'challeng':83,116 'commit':78 'connect':185 'cost':58 'crawl':176 'crypto API gateway' 'data':47,52 'decim':131 'descript':214 'document':177,225 'embed':168 'empti':181 'enabl':36 'endpoint':45,57,103,149,162,226 'essenti':180 'estim':172 'etc':174 'everi':56 'exact':137 'exampl':195 'feed':170 'finance/web3':51 'found':197 'function':200 'gas':171 'generic':216 'geocod':173 'handl':85 'header':93 'http':151 'http-post' 'infer':50 'inlin':86 'json-response' 'key':72 'land':158 'limit':75 'list':107 'live':221 'lowpaymentfee' 'lowpaymentfee.com':31 'mani':161 'micropayment API' 'name':206 'network':9,24,68 'no-api-key' 'offer':40 'on-chain':98 'openapi':189 'page':159,178 'paid':62 'pay':2,17 'pay-per-request':1,16 'payment':82,92,134 'per':3,18,60 'platform':6,21,38 'post':152 'premium':109 'price':169 'prompt':187 'rate':74 'request':4,19,61,97,117 'request/response':191 'requir':79 'resourc':211 'return':113,154 'schema':192 'scheme':135 'second':141 'sentiment':164 'servic':55 'settl':95,143 'shop':209 'show':182 'span':46 'spec':190 'specif':102 'suggest':207 'summar':167 'text':166 'timeout':142 'treat':217 'unclear':204 'under-docu':223 'unit':123 'usag':194 'usdc':15,30,64,125 'usdc-base-network' 'util':54 'via':10,25 'wallet':186 'x':91 'x-payment':90 'x402':11,26,35,81 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"87312664-551d-45c4-9e32-629024b6f01d","listingId":"40824a45-978e-4662-9276-0c78d26ca398","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:51.412Z"}],"sources":[{"listingId":"40824a45-978e-4662-9276-0c78d26ca398","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:51.412Z","lastSeenAt":"2026-04-23T02:00:43.879Z"}],"details":{"listingId":"40824a45-978e-4662-9276-0c78d26ca398","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/50 \\\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":"Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/50"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/50"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need on-chain per-call payment settlement","Exploring x402 protocol integration for pay-as-you-go services"],"bestFor":["Developers experimenting with x402 payment protocol on Base","AI agents that can autonomously pay for API calls in USDC","Use cases requiring keyless, commitment-free API access"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users without USDC on the Base network","High-volume use cases where per-call crypto settlement overhead is impractical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.511Z"},"updatedAt":"2026-04-23T02:00:43.879Z"}}