{"id":"373ad76a-ff48-49f6-b1be-f7308119f241","shortId":"mtLSsM","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 site 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). Most endpoints are listed at $0.02 per request.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/175` is labeled \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…) on the Base network, which equals $0.02 USD (USDC uses 6 decimals). Payment is made via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what this particular \"Premium API Access\" endpoint actually returns. The site advertises no API keys, no rate limits, and instant access, but the actual functionality behind this specific subscription endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC api access","Base network api","micropayment api","premium api"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The actual functionality of /api/v1/stripe/subscriptions/175 is completely undocumented","The endpoint path suggests Stripe subscription management but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/175","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/175","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 zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and all doc pages are empty beyond a wallet connect prompt. The 'Premium API Access' label is generic and 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'0.02':84,118 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '0x8335':111 '20':105 '6':122 'Base network api' 'USDC api access' 'accept':137 'access':6,20,36,95,182,197 'actual':184,200 'addit':163 'address':133 'advertis':188 'ai/ml':56 'analysi':58 'analyt':55 'api':5,19,35,52,94,150,181,190 'application/json':142 'base':8,22,107,114 'behind':37,202 'broad':45 'call':51 'catalog':46 'challeng':101 'classif':60 'connect':158 'content':164 'convers':77 'data':54 'decim':123 'descript':175 'doc':148 'document':143 'embed':61 'endpoint':30,80,89,136,183,206 'equal':117 'estim':71 'exact':130 'exampl':172 'exchang':66 'extrem':145 'feed':65 'financ':62 'function':201 'gas':70 'gate':3,17 'generat':78 'geocod':75 'host':43 'infrastructur':73 'instant':196 'json-response' 'key':191 'label':92 'limit':194 'list':82 'lowpaymentfee' 'lowpaymentfee.com':32 'made':126 'micropayment api' 'network':115 'openapi':168 'page':153 'paid':9,23 'particular':179 'pay':49 'pay-per-cal':48 'pay-per-call api' 'pay-per-request' 'payment':124 'paywal':40 'per':11,25,50,85 'per-request':10,24 'post':138 'post-method' 'premium':4,18,34,93,180 'premium api' 'price':64,149 'prompt':160 'provid':33 'quot':69 'rate':67,193 'readm':152 'render':155 'request':12,26,86,102,139 'request/response':171 'return':97,141,185 'schema':169 'scheme':131 'sentiment':57 'site':42,187 'span':53 'spars':146 'specif':88,204 'subscript':205 'summar':59 'token':68 'unclear':208 'unit':108 'usd':119 'usdc':14,28,110,120 'usdc-base' 'use':121 'util':74 'valid':76,99 'via':127 'wallet':159 'web3':63 'x402':2,16,39,100,129 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c8b5ba04-7af8-4650-946b-3f56f8083922","listingId":"373ad76a-ff48-49f6-b1be-f7308119f241","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/175","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:34.312Z"}],"sources":[{"listingId":"373ad76a-ff48-49f6-b1be-f7308119f241","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/175","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:34.312Z","lastSeenAt":"2026-04-22T15:02:03.470Z"}],"details":{"listingId":"373ad76a-ff48-49f6-b1be-f7308119f241","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/175 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge; attach 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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/175"},{"claim":"Most listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site hosts APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/175"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without API keys or subscriptions","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over traditional API subscriptions"],"notFor":["Users needing detailed API documentation or schemas before integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request pricing may not be economical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.288Z"},"updatedAt":"2026-04-22T15:02:03.470Z"}}