{"id":"0e51f4e3-601d-42c4-b876-228b12de7e08","shortId":"YNszEk","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The endpoint is located at `/api/v1/stripe/subscriptions/158` and accepts POST requests. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 \"exact\" scheme.\n\nThe x402 challenge advertises a maxAmountRequired of 20,000 base units. Since USDC uses 6 decimals, this converts to $0.02 per request, consistent with the site's stated pricing of $0.02/request across all its endpoints. The provider advertises no API keys, no rate limits, and instant access.\n\nThe broader lowpaymentfee.com platform offers multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. However, this specific endpoint (`/api/v1/stripe/subscriptions/158`) is labeled \"Premium API Access\" without further documentation on what data or functionality it returns. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt, providing no additional technical detail. Without request/response schema documentation, the actual behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","crypto-paid API","micropayment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","The endpoint path '/api/v1/stripe/subscriptions/158' is unexplained; actual functionality is unknown","No request body schema or response schema documented","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/158","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/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation on what the endpoint actually does, no request/response schema, and the docs/pricing/README pages are all empty beyond a wallet connect prompt. The endpoint path ('stripe/subscriptions/158') is opaque and 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'/request':99 '0.02':87,98 '000':76 '0x8335':61 '20':75 '2913':62 '6':82 'Base network API' 'USDC API access' 'accept':48 'access':6,20,36,115,144 'across':100 'actual':179 'addit':171 'advertis':71,106 'ai':127 'analyt':126 'api':5,19,35,108,122,143,158 'base':8,22,56,77 'base-network' 'behavior':180 'behind':37 'broader':117 'categori':123 'challeng':70 'connect':166 'consist':90 'contract':60 'convert':85 'crypto-paid API' 'data':125,150 'decim':83 'detail':173 'doc':156 'document':147,177 'endpoint':30,42,103,138,183 'exact':66 'financ':130 'function':152 'gate':3,17 'howev':135 'includ':124 'infrastructur':133 'instant':114 'key':109 'label':141 'learn':129 'limit':112 'locat':44 'lowpaymentfee' 'lowpaymentfee.com':32,118 'machin':128 'maxamountrequir':73 'micropayment API' 'multipl':121 'network':57 'offer':120 'page':161 'paid':9,23 'pay-per-call API' 'payment':51 'paywal':40 'per':11,25,88 'per-request':10,24 'per-request-billing' 'platform':119 'post':49 'post-method' 'premium':4,18,34,142 'price':96,157 'prompt':168 'provid':33,105,169 'rate':111 'readm':160 'remain':184 'render':163 'request':12,26,50,89 'request/response':175 'return':154 'schema':176 'scheme':67 'settl':53 'sinc':79 'site':93 'specif':137 'state':95 'technic':172 'unclear':185 'unit':78 'usdc':14,28,59,80 'usdc-settlement' 'use':58,81 'util':134 'via':63 'wallet':167 'web3':131 'without':145,174 'x402':2,16,39,65,69 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"49839b67-d0f2-44eb-9420-ccda0cc2763e","listingId":"0e51f4e3-601d-42c4-b876-228b12de7e08","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/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:24.673Z"}],"sources":[{"listingId":"0e51f4e3-601d-42c4-b876-228b12de7e08","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/158","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:24.673Z","lastSeenAt":"2026-04-22T18:32:18.219Z"}],"details":{"listingId":"0e51f4e3-601d-42c4-b876-228b12de7e08","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/158\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"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/158","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/158"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/158"}],"useCases":["Programmatic access to a premium API endpoint with per-request USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that can settle USDC on Base for per-call API access","Use cases requiring no API key or subscription commitment"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring known, well-documented response schemas","Non-crypto payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.745Z"},"updatedAt":"2026-04-22T18:32:18.219Z"}}