{"id":"3141b628-1960-4611-8d3e-ba48182599a4","shortId":"PuwDPp","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 a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/112` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per call (USDC uses 6 decimals). Payment is made via the x402 `exact` scheme with a 300-second timeout.\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 $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The specific behavior of the `/api/v1/stripe/charges/112` endpoint (what it returns, what input it expects) is not documented anywhere in the crawled material. The endpoint is live and returning a valid x402 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-micropayment","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","USDC api access","base network api","stripe charges api"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose and expected input/output of /api/v1/stripe/charges/112 is undocumented","The endpoint path suggests Stripe charge functionality but no details confirm this"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/112","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/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is essentially no documentation: no OpenAPI spec, no request/response schemas, no examples, and the docs pages are empty. The purpose of this specific endpoint ('/api/v1/stripe/charges/112') is unclear beyond its title 'Premium API Access'. Score reflects a functional but undocumented 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'/api/v1/stripe/charges/112':68,222 '/docs':182 '/pricing':184 '/readme':186 '/request':17,36 '0.02':16,35,96,162 '000':88 '0x8335':93 '20':87 '300':113 '402':248 '6':101 'USDC api access' 'accept':76 'access':74 'advertis':119 'ai':10,29,131 'amount':85 'analysi':135 'analyt':125 'anywher':234 'api':4,23,44,73,123,167 'avail':213 'base':7,26,62,89 'base network api' 'behavior':219 'behind':52 'broader':117 'call':98 'categori':121 'challeng':81,249 'classif':138 'commit':175 'connect':192 'convers':155 'crawl':216,237 'data':9,28,124,128 'decim':102 'detail':199 'document':177,208,233 'embed':139 'endpoint':14,33,51,66,158,223,240 'equal':95 'estim':149 'exact':109 'exampl':212 'exchang':144 'expect':230 'export':129 'extrem':179 'feed':143 'financ':11,30,140 'four':120 'gas':148 'gate':3,22,47 'generat':156 'geocod':153 'indic':82 'infrastructur':151 'input':228 'insight':130 'key':168 'learn':133 'limit':171 'list':70,160 'live':242 'low payment fee' 'lowpaymentfee.com':39 'machin':132 'made':105 'marketplac':45 'materi':238 'maximum':84 'metric':126 'micropay':56 'micropayment api' 'minimum':174 'network':63 'no-api-key' 'no-rate-limit' 'offer':8,27 'openapi':203 'page':187 'pay-per-request api' 'payment':103 'per':54,97,163 'per-request':53 'per-request-micropayment' 'platform':5,24,118 'post':77 'post-endpoint' 'premium':72 'price':142 'prompt':194 'protocol':43 'quot':147 'rate':145,170 'render':189 'report':127 'request':55,78,164 'request/response':206 'requir':176 'return':226,244 'schema':207 'scheme':110 'second':114 'sentiment':134 'settl':57 'spars':180 'spec':204 'specif':65,218 'stripe charges api' 'summar':137 'technic':198 'text':136 'timeout':115 'token':146 'unit':90 'usag':211 'usdc':19,38,59,92,99 'usdc-base-network' 'use':100 'util':13,32,152 'valid':154,246 'varieti':49 'via':18,37,106 'wallet':193 'web3':141 'x402':2,21,42,80,108,247 'x402 api' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"8425b04a-f272-4d1b-a1de-ffbdaad08548","listingId":"3141b628-1960-4611-8d3e-ba48182599a4","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/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:51.895Z"}],"sources":[{"listingId":"3141b628-1960-4611-8d3e-ba48182599a4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/112","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:51.895Z","lastSeenAt":"2026-04-22T20:01:24.160Z"}],"details":{"listingId":"3141b628-1960-4611-8d3e-ba48182599a4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/112 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/112"},{"claim":"All endpoints are listed 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 APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402-compatible agents with low-cost data or utility endpoints","Accessing premium API functionality via on-chain USDC micropayments on Base"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and autonomous agents on Base","Low-volume or experimental use cases where per-call pricing is preferable"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where subscription pricing would be cheaper","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.051Z"},"updatedAt":"2026-04-22T20:01:24.160Z"}}