{"id":"4e8eb098-d7b8-4f32-af6d-d5ce262f982b","shortId":"bzDWu9","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 specific resource path (`/api/v1/stripe/subscriptions/71`) suggests a subscription-tier or premium-level endpoint, though the exact data or functionality it returns is not documented beyond its title. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 exact-payment scheme.\n\nThe x402 challenge indicates a maximum required amount of 20,000 base units of USDC. Since USDC uses 6 decimals, this converts to $0.02 per request — consistent with the site-wide pricing of $0.02/request advertised on the landing page. The provider emphasizes no API keys, no rate limits, and instant access; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nlowpaymentfee.com hosts a broader catalog of x402-gated APIs spanning data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/crypto (price feeds, exchange rates, gas estimates), and utility services (geocoding, validation, conversion). However, the specific behavior and response schema of this particular `/api/v1/stripe/subscriptions/71` endpoint are undocumented — the crawled docs, pricing, and API pages all returned only a \"Connect wallet\" stub with no further detail.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-call-pricing","premium-api-access","no-api-key-required"],"categories":["api-gateway","payments"],"synonyms":["x402 paid API","USDC per-call API","lowpaymentfee premium","Base network API access","pay-per-request endpoint","crypto-gated API"],"warnings":["No documentation available — all doc/pricing/API pages return only a 'Connect wallet' stub with no content.","The endpoint path references 'stripe/subscriptions' which is unusual for an x402-only endpoint; actual behavior is unknown.","No request body schema or response schema is provided; callers cannot know what to send or expect back.","The 'Premium API Access' title is generic and does not describe the endpoint's function."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/71","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/71","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) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation of what this endpoint actually returns, no request/response schema, and the crawled doc pages are all empty stubs. The endpoint path ('stripe/subscriptions/71') is opaque and 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'/request':124 '0.02':112,123 '000':99 '0x8335':80 '20':98 '2913':81 '6':107 'Base network API access' 'USDC per-call API' 'access':6,20,36,141 'advertis':125 'ai/ml':168 'amount':96 'api':5,19,35,134,165,205 'attach':144 'base':8,22,75,100 'behavior':189 'behind':37 'beyond':67 'broader':159 'call':12,26 'caller':142 'catalog':160 'challeng':91 'classif':171 'connect':211 'consist':115 'contract':79 'convers':185 'convert':110 'crawl':201 'crypto-gated API' 'data':59 'data/analytics':167 'decim':108 'detail':217 'doc':202 'document':66 'embed':172 'emphas':132 'endpoint':30,55,197 'estim':179 'exact':58,86 'exact-pay':85 'exchang':176 'feed':175 'finance/crypto':173 'function':61 'gas':178 'gate':3,17,164 'geocod':183 'header':149 'host':157 'howev':186 'indic':92 'instant':140 'key':135 'land':128 'level':54 'limit':138 'lowpaymentfee premium' 'lowpaymentfee.com':32,156 'maximum':94 'network':76 'no-api-key-required' 'page':129,206 'paid':9,23 'particular':195 'path':44 'pay-per-request endpoint' 'payment':70,87,148,154 'paywal':40 'per':11,25,113 'per-cal':10,24 'per-call-pricing' 'premium':4,18,34,53 'premium-api-access' 'premium-level':52 'price':121,174,203 'proof':155 'provid':33,131 'rate':137,177 'request':114 'requir':95 'resourc':43 'respons':191 'return':63,208 'schema':192 'scheme':88 'sentiment':169 'servic':182 'settl':72 'simpli':143 'sinc':104 'site':119 'site-wid':118 'span':166 'specif':42,188 'stub':213 'subscript':49 'subscription-ti':48 'suggest':46 'summar':170 'though':56 'tier':50 'titl':69 'undocu':199 'unit':101 'usdc':14,28,78,103,105 'usdc-base-network' 'use':77,106 'util':181 'valid':152,184 'via':82 'wallet':212 'wide':120 'x':147 'x-payment':146 'x402':2,16,39,84,90,153,163 'x402 paid API' 'x402-gated':1,15,162 'x402-payment'","prices":[{"id":"bbfb5355-7a2f-4565-b527-ea53720861e4","listingId":"4e8eb098-d7b8-4f32-af6d-d5ce262f982b","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:53.015Z"}],"sources":[{"listingId":"4e8eb098-d7b8-4f32-af6d-d5ce262f982b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:53.015Z","lastSeenAt":"2026-04-22T10:32:09.912Z"}],"details":{"listingId":"4e8eb098-d7b8-4f32-af6d-d5ce262f982b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/71 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/71"},{"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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/71"},{"claim":"Documentation, pricing, and API pages return only a 'Connect wallet' stub","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or services with per-call USDC micropayments","Agent-driven workflows that need keyless, instant API access","Programmatic consumption of gated endpoints without subscription management"],"bestFor":["Agents or developers who want frictionless pay-per-call access without API keys","Users already holding USDC on Base who want low-fee micropayments","Automated pipelines that need on-demand premium API calls"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.452Z"},"updatedAt":"2026-04-22T10:32:09.912Z"}}