{"id":"487f473d-4802-449b-aca9-96bdd18651e3","shortId":"VWStdb","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/stripe/charges/174` is listed as \"Premium API Access\" and accepts payment via the x402 exact scheme. The x402 challenge confirms the endpoint is live, accepting POST requests, and requires up to 20,000 base units of USDC (0x8335…) on Base — which equals $0.02 USD (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 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.\n\nHowever, the specific functionality behind the `/api/v1/stripe/charges/174` path is unclear — it does not map to any of the documented API categories on the landing page, and the name \"Premium API Access\" is generic. Documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-method"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","crypto API gateway"],"warnings":["The endpoint path /api/v1/stripe/charges/174 does not correspond to any documented API on the landing page — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.","No OpenAPI schema or request/response examples are available for any endpoint on the platform.","The description 'Premium API Access' is generic and does not describe what the endpoint actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/174","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/174","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 confirms pricing and payment details, but the specific endpoint's functionality is undocumented. All doc pages return only 'Connect wallet' with no content. No OpenAPI schema, no request/response examples, and the endpoint path ('stripe/charges/174') doesn't match any listed API category. Effectively a stub 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'/api/v1/stripe/charges/174':68,192 '/docs':221 '/pricing':223 '/readme':224 '/request':17,36 '0.02':16,35,109,172 '000':99 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':120 '0x8335':104 '20':98 '300':123 '6':113 'Base network API' 'USDC API access' 'accept':76,91 'access':48,74,216 'address':119 'advertis':129 'ai':10,29,141 'analysi':145 'analyt':135 'api':4,23,44,73,133,177,205,215 'avail':248 'base':7,26,62,100,106 'base-network' 'behind':54,190 'broader':127 'categori':131,206 'challeng':85 'classif':148 'commit':185 'confirm':86 'connect':229 'content':235 'convers':165 'crypto API gateway' 'data':9,28,134,138 'decim':114 'detail':246 'document':204,219,247 'embed':149 'endpoint':14,33,53,66,88,168,254 'equal':108 'estim':159 'exact':81 'exampl':243 'exchang':154 'export':139 'feed':153 'financ':11,30,150 'four':130 'function':189 'gas':158 'gate':3,22,47 'generat':166 'generic':218 'geocod':163 'howev':186 'infrastructur':161 'insight':140 'key':178 'land':209 'learn':143 'limit':181 'list':70,170 'live':90 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':142 'map':199 'marketplac':45 'metric':136 'micropay':59 'micropayment API' 'minimum':184 'name':213 'network':63 'no-api-key' 'offer':8,27 'openapi':239 'page':210,220 'path':193 'pay-per-request API' 'payment':77,115 'per':56,173 'per-request':55 'per-request-billing' 'platform':5,24,128,257 'post':92 'post-method' 'premium':72,214 'price':152 'prompt':231 'protocol':43 'quot':157 'rate':155,180 'report':137 'request':57,93,174 'request/response':242 'requir':95 'return':226 'schema':240 'scheme':82 'second':124 'sent':117 'sentiment':144 'specif':65,188 'substant':234 'summar':147 'text':146 'timeout':125 'token':156 'unclear':195 'unit':101 'usd':110 'usdc':19,38,58,103,111 'usdc-micropayment' 'use':112 'util':13,32,162 'valid':164 'varieti':51 'via':18,37,78 'wallet':230 'web3':151 'x402':2,21,42,80,84 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"45ea4f98-384e-4c7a-9e95-7a0ef2927a89","listingId":"487f473d-4802-449b-aca9-96bdd18651e3","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:01.006Z"}],"sources":[{"listingId":"487f473d-4802-449b-aca9-96bdd18651e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/174","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:01.006Z","lastSeenAt":"2026-04-22T20:01:24.492Z"}],"details":{"listingId":"487f473d-4802-449b-aca9-96bdd18651e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/174 \\\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 on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/174"},{"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 in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without traditional API keys or subscriptions","Integrating x402-compatible agents that autonomously pay for API calls on Base","Accessing data, AI, finance, or utility endpoints via USDC micropayments"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402-compatible wallets and autonomous agents on Base","Low-volume or exploratory API usage without subscription commitments"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-throughput production workloads where per-call crypto payments add latency","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.688Z"},"updatedAt":"2026-04-22T20:01:24.492Z"}}