{"id":"e6c02fa1-6740-40a5-b6fa-94d0751fb5ce","shortId":"ALjJkP","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 protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/carts/29` is listed as \"Premium API Access\" and accepts payment via the x402 exact scheme. The maximum amount required is 20,000 base units of USDC (0x8335…), which equals $0.02 per request given USDC's 6 decimal places.\n\nThe broader platform advertises four categories of APIs: 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 listed at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, no minimums, and instant access — callers simply attach an x402 payment header to each request.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI specification, no request/response schema documentation, and no example payloads available. The specific functionality behind the `/api/v1/carts/29` path is unclear — the name \"Premium API Access\" is generic and the carts/29 path suggests it may be a specific resource or product identifier rather than a general-purpose endpoint. Without documentation, the actual input parameters and response format cannot be determined.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema specification found","The specific purpose and expected input/output of /api/v1/carts/29 ('Premium API Access') is unknown","The 'carts/29' path suggests a specific resource ID; it may not be a general-purpose endpoint","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/29","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, documentation is essentially nonexistent — all doc pages return only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, no examples, and the specific purpose of /api/v1/carts/29 is unclear. This is effectively a stub 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'/api/v1/carts/29':66,221 '/docs':185 '/pricing':187 '/readme':189 '/request':17,34,153 '0.02':16,33,95,152 '000':87 '0x8335':92 '20':86 '6':101 'Base network API' 'USDC API access' 'accept':74 'access':44,72,169,229 'actual':256 'advertis':107 'ai':10,27,119 'amount':83 'analysi':123 'analyt':113 'api':4,21,40,71,111,160,228 'attach':172 'avail':215 'base':7,24,60,88 'base-network' 'behind':50,219 'broader':105 'caller':170 'cannot':262 'carts/29':234 'categori':109 'classif':126 'connect':195 'content':201 'convers':143 'data':9,26,112,116 'decim':102 'determin':264 'document':180,210,254 'embed':127 'emphas':158 'endpoint':14,31,49,64,146,252 'equal':94 'estim':137 'exact':79 'exampl':213 'exchang':132 'export':117 'extrem':182 'feed':131 'financ':11,28,128 'format':261 'four':108 'function':218 'gas':136 'gate':3,20,43 'general':250 'general-purpos':249 'generat':144 'generic':231 'geocod':141 'given':98 'header':176 'identifi':245 'infrastructur':139 'input':257 'insight':118 'instant':168 'json-response' 'key':161 'learn':121 'limit':164 'list':68,148 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'marketplac':41 'maximum':82 'may':238 'metric':114 'micropay':54 'micropayment API' 'minimum':166 'name':226 'network':61 'no-api-key' 'offer':8,25 'openapi':205 'page':190 'paramet':258 'path':222,235 'pay-per-request API' 'payload':214 'payment':75,175 'per':52,96 'per-request':51 'per-request-billing' 'place':103 'platform':5,22,106,157 'point':155 'premium':70,227 'price':130,154 'product':244 'prompt':197 'protocol':39 'purpos':251 'quot':135 'rate':133,163 'rather':246 'report':115 'request':53,97,179 'request/response':208 'requir':84 'resourc':242 'respons':260 'return':192 'schema':209 'scheme':80 'sentiment':122 'settl':55 'simpli':171 'spars':183 'specif':63,206,217,241 'substant':200 'suggest':236 'summar':125 'text':124 'token':134 'unclear':224 'unit':89 'usdc':57,91,99 'usdc-micropayment' 'util':13,30,140 'valid':142 'varieti':47 'via':76 'wallet':196 'web3':129 'without':253 'x402':2,19,38,78,174 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"34134d85-06fc-4bd6-8fd3-2bae0e4b09fc","listingId":"e6c02fa1-6740-40a5-b6fa-94d0751fb5ce","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:16.095Z"}],"sources":[{"listingId":"e6c02fa1-6740-40a5-b6fa-94d0751fb5ce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:16.095Z","lastSeenAt":"2026-04-23T15:00:44.564Z"}],"details":{"listingId":"e6c02fa1-6740-40a5-b6fa-94d0751fb5ce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/29 \\\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":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/29"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven API consumption where payment is embedded in the request header"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.363Z"},"updatedAt":"2026-04-23T15:00:44.564Z"}}