{"id":"8b29dcde-17c9-4deb-ad21-26111a77b628","shortId":"YWdeUk","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall, settling payments in USDC on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the site's advertised $0.02/request pricing across all its endpoints.\n\nThe provider hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02 pricing model with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol.\n\nThis specific endpoint (/api/v1/stripe/subscriptions/138) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that title. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no further detail. Without documentation or an OpenAPI schema, the exact request/response format and the concrete service this endpoint provides remain unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","crypto-paid API","micropayment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all return only 'Connect wallet' with no content.","The specific functionality of /api/v1/stripe/subscriptions/138 ('Premium API Access') is not described anywhere in the crawled material.","No OpenAPI schema or request/response examples are available.","The endpoint path includes 'stripe/subscriptions' which may imply Stripe subscription management, but this is unconfirmed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/138","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/subscriptions/138","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 captured) with clear pricing ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example requests or responses, and the actual functionality behind \"Premium API Access\" is undefined. The docs/pricing/README pages all render only a wallet-connect 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'/request':74 '0.02':63,73,123 '000':58 '20':57 'Base network API' 'USDC API access' 'access':6,20,36,153 'across':76 'actual':156 'advertis':72 'ai/ml':95 'analysi':97 'analyt':94 'api':5,19,35,91,128,152,168 'base':8,22,47,59 'base-network' 'behind':37 'beyond':161 'broad':84 'call':12,26,90 'catalog':85 'challeng':51 'classif':99 'commit':135 'concret':195 'connect':176 'consist':67 'convers':116 'cost':55 'crawl':165 'crypto-paid API' 'data':93 'detail':182 'doc':166 'document':160,184 'embed':100 'endpoint':30,79,119,147,198 'entir':140 'estim':110 'exact':190 'exchang':105 'feed':104 'financ':101 'format':192 'function':157 'gas':109 'gate':3,17 'generat':117 'geocod':114 'handl':139 'host':82 'http-post' 'indic':52 'infrastructur':112 'key':129 'label':150 'limit':132 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':54 'micropayment API' 'model':125 'network':48 'no-api-key' 'openapi':187 'page':171 'paid':9,23 'pay':88 'pay-per-cal':87 'pay-per-call' 'pay-per-request API' 'payment':42,137 'paywal':40 'per':11,25,65,89 'per-cal':10,24 'premium':4,18,34,151 'price':75,103,124,167 'prompt':178 'protocol':144 'provid':33,81,199 'quot':108 'rate':106,131 'readm':170 'remain':200 'request':66 'request/response':191 'requir':136 'return':173 'schema':188 'sentiment':96 'servic':196 'settl':41 'share':120 'site':70 'span':92 'specif':146 'summar':98 'titl':163 'token':107 'unclear':201 'unit':60 'usd':64 'usdc':14,28,44,62 'usdc-settlement' 'util':113 'valid':115 'via':141 'wallet':177 'web3':102 'without':183 'x402':2,16,39,50,143 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ec89740f-8397-450d-80b4-af0bce1b65f7","listingId":"8b29dcde-17c9-4deb-ad21-26111a77b628","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/subscriptions/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:22.309Z"}],"sources":[{"listingId":"8b29dcde-17c9-4deb-ad21-26111a77b628","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:22.309Z","lastSeenAt":"2026-04-22T18:32:18.092Z"}],"details":{"listingId":"8b29dcde-17c9-4deb-ad21-26111a77b628","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/138 \\\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 (USD Coin, 6 decimals = $0.02) on the Base network.","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/138"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers endpoints across data & analytics, AI/ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without traditional API key management","Agent-driven workflows that need to pay per call using USDC on Base","Accessing pay-as-you-go endpoints without subscriptions or commitments"],"bestFor":["Developers or agents wanting frictionless per-call payment via x402","Use cases requiring no-signup, no-rate-limit API access","Crypto-native applications already operating on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who prefer flat-rate or subscription pricing","Anyone needing to understand the exact response format before committing payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.843Z"},"updatedAt":"2026-04-22T18:32:18.092Z"}}