{"id":"c633147b-6eaf-4dd2-a9a4-a3b509379507","shortId":"RgkGhv","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/86` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of endpoints: 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 per request price point. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json responses.\n\nNote that the specific functionality behind the `/api/v1/carts/86` path is unclear — the name \"Premium API Access\" and the carts-style URL do not map obviously to any of the documented API categories. Documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this or any other endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","post-method","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","Base USDC API","402 payment API"],"warnings":["The specific functionality of /api/v1/carts/86 ('Premium API Access') is unclear — the carts-style path does not match any documented API category","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content","No request or response schema is available for any endpoint on the platform","The platform lists many endpoint categories (AI, finance, data, infrastructure) but none could be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/86","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/86","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 challenge, but the actual functionality behind /api/v1/carts/86 is undocumented. No OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The listing is effectively a stub with pricing 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'/request':17,34 '0.02':16,33,78,156 '000':82 '20':81 '402 payment API' '6':88 'Base USDC API' 'accept':169 'access':45,73,191 'actual':227 'advertis':111 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,41,72,99,190,207 'application/json':174 'base':7,24,61,83 'behind':51,181 'broader':109 'call':80 'cart':195 'carts-styl':194 'categori':113,208 'challeng':163 'classif':130 'confirm':164 'connect':218 'content':224 'convers':147 'cost':75 'data':9,26,116,120 'decim':89 'doc':211 'document':206,209 'embed':131 'endpoint':14,31,50,65,115,150,166,235 'estim':141 'exact':96 'exchang':136 'export':121 'feed':135 'financ':11,28,132 'four':112 'function':180 'gas':140 'gate':3,20,44 'generat':148 'geocod':145 'handl':92 'infrastructur':143 'insight':122 'json-response' 'key':100 'learn':125 'limit':103 'list':69,152 'live':168 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'map':200 'marketplac':42 'metric':118 'micropay':55 'name':188 'network':62 'no-api-key' 'no-rate-limit' 'note':176 'obvious':201 'offer':8,25 'page':210 'path':184 'pay-per-request API' 'payment':90 'per':53,79,157 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'point':160 'post':170 'post-method' 'premium':71,189 'price':134,159,212 'prompt':220 'protocol':40 'quot':139 'rate':102,137 'readm':213 'report':119 'request':54,158,171 'request/response':228 'requir':107 'respons':175 'return':173,215 'schema':229 'scheme':97 'sentiment':126 'settl':56 'specif':64,179 'style':196 'subscript':106 'substant':223 'summar':129 'text':128 'token':138 'unclear':186 'unit':84 'unknown':237 'url':197 'usdc':58,86 'usdc-base' 'util':13,30,144 'valid':146 'varieti':48 'via':93 'wallet':219 'web3':133 'x402':2,19,39,95,162 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"84d7733a-3046-4d74-ae94-8684cfd3df33","listingId":"c633147b-6eaf-4dd2-a9a4-a3b509379507","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/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:39.089Z"}],"sources":[{"listingId":"c633147b-6eaf-4dd2-a9a4-a3b509379507","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:39.089Z","lastSeenAt":"2026-04-23T12:05:08.045Z"}],"details":{"listingId":"c633147b-6eaf-4dd2-a9a4-a3b509379507","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/86 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/86"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/86"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Micropayment-gated data retrieval where per-call billing is preferred over subscriptions","Programmatic access to utility or data endpoints settled on Base L2"],"bestFor":["AI agents with x402-compatible wallets looking for frictionless API access","Developers who want pay-as-you-go pricing with no commitments","Use cases requiring low-cost per-request billing on Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.344Z"},"updatedAt":"2026-04-23T12:05:08.045Z"}}