{"id":"2e21949b-e62f-4ad3-be36-43317c0eaea0","shortId":"LhRSLh","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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform use the x402 protocol for per-request payment, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/78` is listed as \"Premium API Access\" and requires a POST request. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — payment is the only authentication mechanism.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what \"Premium API Access\" actually returns or what input it expects. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what functionality this specific subscription endpoint provides beyond its name.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","lowpaymentfee","Base network API","crypto-paid API","subscription endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content.","No OpenAPI or output schema provided; it is unknown what this endpoint returns on successful payment.","The purpose of 'Premium API Access' at a stripe/subscriptions path is unclear — it may relate to subscription management but this is unconfirmed.","No request body schema documented; POST input format is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/78","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/78","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 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response examples, and no explanation of what 'Premium API Access' actually does. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The listing is essentially a 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'0.02':125 '000':115 '0x8335':120 '20':114 '402':200 '6':130 'Base network API' 'USDC API access' 'access':6,20,36,100,143,188 'actual':189 'advertis':134 'ai':62 'amount':112 'analyt':61 'api':5,19,35,57,99,136,157,187 'authent':148 'base':8,22,89,116,122 'base-network' 'behind':37 'beyond':216 'call':12,26 'categori':58 'challeng':108,201 'confirm':202 'connect':166 'content':172 'crawl':155 'crypto-paid API' 'data':60 'decim':131 'descript':183 'doc':156 'document':150,205 'endpoint':30,46,71,93,197,214 'equal':124 'exampl':180 'expect':195 'extrem':152 'financ':65 'function':210 'gate':3,17 'host':53 'includ':59 'indic':109 'infrastructur':68 'input':193 'instant':142 'key':137 'learn':64 'limit':140 'list':96 'live':199 'lowpaymentfee' 'lowpaymentfee.com':32,50 'machin':63 'mani':45 'maximum':111 'mechan':149 'name':218 'network':90 'no-api-key' 'offer':47 'one':43 'openapi':176 'page':161 'paid':9,23 'pay-per-call API' 'payment':83,144 'paywal':40 'per':11,25,81,126 'per-cal':10,24 'per-request':80 'per-request-billing' 'platform':51,74,133 'post':104 'post-method' 'premium':4,18,34,98,186 'price':158 'prompt':168 'protocol':78 'provid':33,215 'rate':139 'readm':160 'request':82,105,127 'request/response':179 'requir':102 'return':163,190 'schema':177 'settl':84 'spars':153 'specif':92,212 'subscript':213 'subscription endpoint' 'substant':171 'unclear':208 'unit':117 'usdc':14,28,86,119,128 'usdc-settlement' 'use':75,129 'util':69 'varieti':55 'wallet':167 'web3':66 'without':204 'x402':2,16,39,77,107 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"69044a6c-abe7-4295-98fe-df195d29776d","listingId":"2e21949b-e62f-4ad3-be36-43317c0eaea0","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:05.117Z"}],"sources":[{"listingId":"2e21949b-e62f-4ad3-be36-43317c0eaea0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:05.117Z","lastSeenAt":"2026-04-22T09:01:35.728Z"}],"details":{"listingId":"2e21949b-e62f-4ad3-be36-43317c0eaea0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/78\n# Returns 402 with x402 challenge. Include X-PAYMENT header with valid payment proof to access.","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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/78"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/78"},{"claim":"Docs, API, pricing, and README pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic subscription management via x402 payment protocol"],"bestFor":["Developers wanting keyless, pay-per-use API access on Base","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request crypto settlement overhead is impractical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.866Z"},"updatedAt":"2026-04-22T09:01:35.728Z"}}