{"id":"1ffe53cc-2df0-46be-b68c-5daf3b5f354a","shortId":"JAXCMx","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/backups/13` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment challenge. The site advertises a flat $0.02 per request across all its endpoints, paid in USDC (contract 0x8335…2913 on Base). No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform organizes its endpoints into 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 appear to follow the same x402 payment scheme.\n\nNote that the specific endpoint probed (`/api/v1/backups/13`) does not correspond to any of the publicly listed API categories on the landing page, and its actual functionality is unclear — the description is simply \"Premium API Access\" with no further documentation. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content, so there is no detailed documentation available for any endpoint.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","402 payment endpoint"],"warnings":["The endpoint path /api/v1/backups/13 does not match any of the publicly listed API endpoints on the landing page — its actual functionality is unknown.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","No request or response schema is available; callers cannot know what to send or what to expect back.","The platform lists many endpoint categories (AI, finance, data, utils) but none have documented schemas or example payloads."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/13","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/backups/13","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 USDC on Base), but there is no documentation, no request/response schema, and the specific endpoint path (/api/v1/backups/13) doesn't match any publicly listed API. The docs pages are empty beyond a wallet-connect 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'/request':17,36 '0.02':16,35,90 '0x8335':101 '2913':102 '402 payment endpoint' 'Base network API' 'USDC API' 'accept':77 'access':49,75,213 'across':93 'actual':203 'addit':233 'advertis':87 'ai':10,29,144 'analysi':148 'analyt':138 'api':4,23,45,74,106,195,212,222 'appear':171 'attach':116 'avail':241 'base':7,26,63,104 'base-network' 'behind':55 'broader':129 'caller':114 'categori':136,196 'challeng':84 'classif':151 'connect':228 'content':234 'contract':100 'convers':167 'correspond':188 'data':9,28,137,141 'descript':208 'detail':239 'doc':219 'document':217,240 'embed':152 'endpoint':14,33,54,67,96,133,170,183,244 'estim':162 'exchang':157 'export':142 'feed':156 'financ':11,30,153 'flat':89 'follow':173 'four':135 'function':204 'gas':161 'gate':3,22,48 'generat':168 'geocod':165 'header':121 'infrastructure/utilities':164 'insight':143 'json-response' 'key':107 'land':199 'learn':146 'limit':109 'list':71,194 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':145 'marketplac':46 'metric':139 'micropay':60 'micropayment API' 'network':64 'no-api-key' 'note':179 'offer':8,27 'organ':131 'page':200,223 'paid':97 'pay-per-request API' 'payment':83,120,126,177 'per':57,91 'per-request':56 'per-request-billing' 'platform':5,24,130 'post':78 'post-endpoint' 'premium':73,211 'price':155,220 'probe':184 'prompt':230 'proof':127 'protocol':44 'public':193 'quot':160 'rate':108,158 'render':225 'report':140 'request':58,79,92 'requir':113 'scheme':178 'sentiment':147 'simpli':115,210 'site':86 'specif':66,182 'subscript':111 'summar':150 'text':149 'token':159 'unclear':206 'usdc':19,38,59,99 'usdc-micropayment' 'util':13,32 'valid':124,166 'varieti':52 'via':18,37 'wallet':229 'web3':154 'x':119 'x-payment':118 'x402':2,21,43,82,125,176 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"4bfc9fa7-9a4b-4749-93c3-2d1c4d90681b","listingId":"1ffe53cc-2df0-46be-b68c-5daf3b5f354a","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/backups/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:47.507Z"}],"sources":[{"listingId":"1ffe53cc-2df0-46be-b68c-5daf3b5f354a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:47.507Z","lastSeenAt":"2026-04-22T10:02:38.059Z"}],"details":{"listingId":"1ffe53cc-2df0-46be-b68c-5daf3b5f354a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/13 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02.","source_url":"https://lowpaymentfee.com/api/v1/backups/13"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Users who want pay-per-use pricing without subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without a Base-network USDC wallet","High-volume use cases where per-request payment overhead matters"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.272Z"},"updatedAt":"2026-04-22T10:02:38.059Z"}}