{"id":"c50f8654-dc14-40a6-a0d1-2f8c456116d2","shortId":"LU5dW5","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/61` is labeled \"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 with a valid x402 payment proof.\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/61`) does not clearly map to any of these advertised categories — its \"Premium API Access\" label 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 schema, no request/response examples, and no description of what this particular endpoint 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 is actually provided.","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 access","Base network API","lowpaymentfee","crypto-gated API"],"warnings":["The specific functionality of /api/v1/stripe/charges/61 is completely undocumented — 'Premium API Access' is a generic label with no description of inputs or outputs.","All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI schema or request/response examples are available anywhere.","The endpoint path includes 'stripe/charges' which is unusual for an x402-gated endpoint and may indicate a Stripe-related proxy or test endpoint — purpose unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/61","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/61","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 schema, no request/response examples, and no documentation explaining what this specific endpoint actually does. The 'Premium API Access' label is entirely generic. Docs pages return only wallet-connect 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'/api/v1/stripe/charges/61':65,183 '/docs':212 '/pricing':214 '/readme':216 '/request':17,34,174 '0.02':16,33,98,173 '000':93 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':84 '20':92 '6':102 'Base network API' 'USDC API access' 'accept':72 'access':45,70,197 'across':131 'actual':203,275 'advertis':129,192 'ai':10,27,141 'amount':90 'analysi':145 'analyt':135 'api':4,21,41,69,105,196 'attach':114 'base':7,24,59,86,94 'base-network' 'behind':51 'broader':127 'caller':112 'categori':133,193 'chain':80 'challeng':248 'classif':148 'clear':186 'confirm':255 'connect':222 'content':228 'contract':83 'convers':165 'crypto-gated API' 'data':9,26,134,138,271 'decim':103 'descript':239 'determin':269 'document':207,264 'embed':149 'endpoint':14,31,50,63,130,169,179,244,257 'equival':96 'estim':159 'exampl':236 'exchang':154 'export':139 'extrem':209 'feed':153 'financ':11,28,150 'form':254 'four':132 'function':204 'gas':158 'gate':3,20,44 'generat':166 'generic':200 'geocod':163 'header':119 'howev':176 'imposs':267 'infrastructur':161 'insight':140 'key':106 'label':67,198 'lack':262 'learn':143 'limit':109 'list':168,181 'live':250 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':142 'make':265 'map':187 'marketplac':42 'maximum':89 'metric':136 'micropay':56 'micropayment API' 'network':60 'no-api-key' 'offer':8,25 'on-chain':78 'openapi':232 'oper':259 'page':217 'particular':243 'pay-per-request API' 'payment':75,118,124 'per':53 'per-request':52 'per-request-billing' 'platform':5,22,128 'post':73 'post-endpoint' 'premium':68,195 'price':152,175 'prompt':224 'proof':125 'protocol':40 'provid':276 'quot':157 'rate':108,155 'render':219 'report':137 'request':54,74 'request/response':235 'requir':111 'return':245 'schema':233 'sentiment':144 'servic':273 'settl':77 'share':170 'simpli':113 'spars':210 'specif':62,178 'substant':227 'summar':147 'text':146 'token':156 'undocu':206 'unit':95 'usd':99 'usdc':55,82,100 'usdc-micropayment' 'use':101 'util':13,30,162 'valid':122,164 'varieti':48 'via':81 'wallet':223 'web3':151 'well':253 'well-form':252 'x':117 'x-payment':116 'x402':2,19,39,123,247 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"74db6444-bd05-4233-8483-7ceb920204d9","listingId":"c50f8654-dc14-40a6-a0d1-2f8c456116d2","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:37.312Z"}],"sources":[{"listingId":"c50f8654-dc14-40a6-a0d1-2f8c456116d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:37.312Z","lastSeenAt":"2026-04-22T18:32:10.830Z"}],"details":{"listingId":"c50f8654-dc14-40a6-a0d1-2f8c456116d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/61 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/61"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/61"},{"claim":"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":["Paying per-request for API access without managing API keys or subscriptions","Integrating on-chain micropayments into automated agent workflows","Accessing gated endpoints via x402 protocol from Base-compatible wallets"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or subscription discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:54.855Z"},"updatedAt":"2026-04-22T18:32:10.830Z"}}