{"id":"30a4f74d-e99d-4ed2-b920-93204409abb6","shortId":"bLFKYn","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. The endpoint is live and returns a standard x402 challenge requiring payment in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request.\n\nThe hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning 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 advertised at $0.02 per request with no API keys, no rate limits, and instant access via the Base network.\n\nThis specific endpoint (`/api/v1/stripe/subscriptions/54`) is labeled \"Premium API Access\" but its actual functionality is unclear — the path suggests it may relate to Stripe subscription management, but no documentation, request schema, or response schema is available. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. Without further documentation it is impossible to confirm what data or service this endpoint returns upon successful payment.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-call-billing","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API","crypto-paid API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The endpoint path '/api/v1/stripe/subscriptions/54' suggests Stripe subscription functionality but this is unconfirmed.","No request or response schema is provided; actual behavior upon successful payment is unknown.","The site lists many endpoints but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/54","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/54","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 no documentation, no request/response schema, and no explanation of what the endpoint actually does beyond the generic label \"Premium API Access\". The site's docs pages are empty (wallet-connect only). This is effectively a stub 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'0.02':76,132 '000':67 '20':66 '6':72 'Base network API' 'USDC API access' 'access':6,20,36,144,157 'actual':160 'advertis':130 'ai':101 'amount':61 'analysi':105 'analyt':95 'api':5,19,35,92,137,156,187 'avail':183 'base':8,22,57,68,147 'behind':37 'broad':86 'call':12,26,64 'catalog':87 'challeng':50 'classif':108 'confirm':209 'connect':195 'content':201 'convers':125 'crypto-paid API' 'data':94,98,211 'decim':73 'doc':185 'document':176,204 'embed':109 'endpoint':30,42,128,151,215 'equal':75 'estim':119 'exchang':114 'export':99 'feed':113 'financ':110 'function':161 'gas':118 'gate':3,17,91 'generat':126 'geocod':123 'host':81 'http-post' 'imposs':207 'infrastructur':121 'insight':100 'instant':143 'key':138 'label':154 'learn':103 'limit':141 'live':44 'lowpaymentfee' 'lowpaymentfee.com':32,83 'machin':102 'manag':173 'maximum':60 'may':168 'metric':96 'micropayment API' 'network':58,148 'no-api-key' 'offer':84 'page':190 'paid':9,23 'path':165 'pay-per-call API' 'payment':52,219 'paywal':40 'per':11,25,63,78,133 'per-cal':10,24 'per-call-billing' 'premium':4,18,34,155 'price':112,186 'prompt':197 'provid':33 'quot':117 'rate':115,140 'readm':189 'relat':169 'render':192 'report':97 'request':79,134,177 'requir':51,62 'respons':180 'return':46,216 'schema':178,181 'sentiment':104 'servic':213 'site':82 'span':93 'specif':150 'standard':48 'stripe':171 'subscript':172 'substant':200 'success':218 'suggest':166 'summar':107 'text':106 'token':116 'unclear':163 'unit':69 'upon':217 'usd':77 'usdc':14,28,54,71 'usdc-base-network' 'util':122 'valid':124 'via':145 'wallet':196 'web3':111 'without':202 'x402':2,16,39,49,90 'x402 API' 'x402-gated':1,15,89 'x402-payment'","prices":[{"id":"c9e0fd78-a8df-4db6-9207-d40c2b29235b","listingId":"30a4f74d-e99d-4ed2-b920-93204409abb6","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:52.403Z"}],"sources":[{"listingId":"30a4f74d-e99d-4ed2-b920-93204409abb6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:52.403Z","lastSeenAt":"2026-04-22T10:32:09.906Z"}],"details":{"listingId":"30a4f74d-e99d-4ed2-b920-93204409abb6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/54\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","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/54"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/54"}],"useCases":["Programmatic access to a premium API endpoint without traditional API key registration","Agent-driven workflows that pay per call using USDC on Base","Exploring x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 payment flows","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or response schemas before purchasing","Production workloads requiring guaranteed SLAs or known response formats","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.45Z"},"updatedAt":"2026-04-22T10:32:09.906Z"}}