{"id":"040d5cee-922e-4d0a-9251-a7d89597663c","shortId":"6KJvbf","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 USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/74` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units — equivalent to $0.02 USD (USDC uses 6 decimals). No API keys or rate limits are required; callers simply attach an X-PAYMENT header conforming to the x402 protocol.\n\nThe broader platform advertises endpoints across 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint being listed here (`/api/v1/stripe/charges/74`) does not clearly map to any of these advertised categories — its name \"Premium API Access\" is generic and its actual functionality is undocumented.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this endpoint actually returns. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it impossible to determine what data or service this specific endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","402 payment endpoint"],"warnings":["The specific endpoint /api/v1/stripe/charges/74 has no documentation — its actual functionality is unknown.","No OpenAPI spec or request/response schema is available for any endpoint on this platform.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content.","The endpoint path includes 'stripe/charges' which does not match any of the advertised API categories on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/74","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/stripe/charges/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational at $0.02/request in USDC on Base. However, there is no OpenAPI spec, no documentation of request/response schemas, and the specific endpoint's functionality ('Premium API Access') is entirely undocumented. The docs, pricing, and README pages are all empty beyond a wallet connect 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'/api/v1/stripe/charges/74':65,183 '/docs':212 '/pricing':214 '/readme':216 '/request':17,34,174 '0.02':16,33,99,173 '000':94 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':85 '20':93 '402 payment endpoint' '6':103 'Base network API' 'USDC API' 'accept':73 'access':45,71,198 'across':131 'actual':203,245 'advertis':129,192 'ai':10,27,141 'amount':91 'analysi':145 'analyt':135 'api':4,21,41,70,106,197 'attach':115 'base':7,24,59,87,95 'base-network' 'behind':51 'broader':127 'caller':113 'categori':133,193 'chain':81 'challeng':249 'classif':148 'clear':186 'confirm':256 'conform':121 'connect':222 'content':228 'contract':84 'convers':165 'data':9,26,134,138,272 'decim':104 'determin':270 'document':207,237,265 'embed':149 'endpoint':14,31,50,63,130,169,179,244,258,277 'equival':97 'estim':159 'exampl':240 'exchang':154 'export':139 'extrem':209 'feed':153 'financ':11,28,150 'form':255 'four':132 'function':204 'gas':158 'gate':3,20,44 'generat':166 'generic':200 'geocod':163 'header':120 'howev':176 'imposs':268 'infrastructur':161 'insight':140 'key':107 'lack':263 'learn':143 'limit':110 'list':67,168,181 'live':251 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':142 'make':266 'map':187 'marketplac':42 'maximum':90 'metric':136 'micropay':56 'micropayment API' 'name':195 'network':60 'no-api-key' 'offer':8,25 'on-chain':79 'openapi':232 'oper':260 'page':217 'pay-per-request API' 'payment':76,119 'per':53 'per-request':52 'per-request-billing' 'platform':5,22,128 'post':74 'post-endpoint' 'premium':69,196 'price':152,175 'prompt':224 'protocol':40,125 'provid':278 'quot':157 'rate':109,155 'render':219 'report':137 'request':54,75 'request/response':235 'requir':112 'return':246 'schema':236 'sentiment':144 'servic':274 'settl':78 'share':170 'simpli':114 'spars':210 'spec':233 'specif':62,178,276 'substant':227 'summar':147 'text':146 'token':156 'undocu':206 'unit':96 'usd':100 'usdc':55,83,101 'usdc-micropayment' 'use':102 'util':13,30,162 'valid':164 'varieti':48 'via':82 'wallet':223 'web3':151 'well':254 'well-form':253 'x':118 'x-payment':117 'x402':2,19,39,124,248 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"2087b90c-03e5-4ede-a8bc-18e7f1bf8074","listingId":"040d5cee-922e-4d0a-9251-a7d89597663c","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/stripe/charges/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:35.498Z"}],"sources":[{"listingId":"040d5cee-922e-4d0a-9251-a7d89597663c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:35.498Z","lastSeenAt":"2026-04-22T18:32:10.681Z"}],"details":{"listingId":"040d5cee-922e-4d0a-9251-a7d89597663c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/74 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/74"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/74"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to gated API services with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access settled in USDC on Base","Low-cost per-request API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","Production workloads requiring guaranteed SLAs or support","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:54.986Z"},"updatedAt":"2026-04-22T18:32:10.681Z"}}