{"id":"92600bdf-5919-4e0a-81b4-c606b5482f70","shortId":"hFz7c4","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\" via the x402 payment protocol. It is located at `/api/v1/stripe/subscriptions/33` and returns a standard x402 challenge (HTTP 402) requiring payment in USDC on the Base network. The challenge advertises a maximum amount of 20,000 base units of USDC (0.02 USD per request), consistent with the site's stated flat pricing of $0.02/request across all endpoints.\n\nThe broader lowpaymentfee.com platform offers a suite 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 share the same $0.02/request pricing, require no API keys, and advertise no rate limits.\n\nHowever, the specific endpoint `/api/v1/stripe/subscriptions/33` is labeled \"Premium API Access\" with no further documentation about what data or functionality it actually returns. The docs, pricing, API, and README pages on the site are all gated behind a wallet-connect screen and provide no additional detail. Without schema documentation or example responses, the actual behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","no-api-key","post-method"],"categories":["payments","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","premium API subscription","crypto-paid API"],"warnings":["No documentation available — all doc pages require wallet connection and show no content","The specific functionality of /api/v1/stripe/subscriptions/33 is completely undocumented","No OpenAPI spec or output schema beyond basic HTTP method info","The endpoint path suggests a Stripe subscription resource but is served via x402/USDC — purpose is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/33","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/33","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 OpenAPI schema, no example request/response, and the endpoint name ('Premium API Access') gives no indication of what it actually does. Docs pages are all behind a wallet-connect gate with no 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'/request':90,146 '0.02':76,89,145 '000':71 '20':70 '402':54 'Base network API' 'USDC API access' 'access':6,20,36,166 'across':91 'actual':177,210 'addit':201 'advertis':65,153 'ai':114 'amount':68 'analysi':118 'analyt':108 'api':5,19,35,105,150,165,182 'base':8,22,61,72 'behavior':211 'behind':192 'broader':95 'call':12,26 'challeng':52,64 'classif':121 'connect':196 'consist':80 'convers':138 'crypto-paid API' 'data':107,111,173 'detail':202 'doc':180 'document':170,205 'embed':122 'endpoint':30,93,141,160,214 'estim':132 'exampl':207 'exchang':127 'export':112 'feed':126 'financ':123 'flat':86 'function':175 'gas':131 'gate':3,17,104,191 'generat':139 'geocod':136 'howev':157 'http':53 'infrastructur':134 'insight':113 'key':151 'label':163 'learn':116 'limit':156 'locat':44 'lowpaymentfee' 'lowpaymentfee.com':32,96 'machin':115 'maximum':67 'metric':109 'network':62 'no-api-key' 'offer':98 'page':185 'paid':9,23 'pay-per-call API' 'payment':40,56 'per':11,25,78 'per-cal':10,24 'per-request-billing' 'platform':97 'post-method' 'premium':4,18,34,164 'premium API subscription' 'price':87,125,147,181 'protocol':41 'provid':33,199 'quot':130 'rate':128,155 'readm':184 'remain':215 'report':110 'request':79 'requir':55,148 'respons':208 'return':48,178 'schema':204 'screen':197 'sentiment':117 'share':142 'site':83,188 'span':106 'specif':159 'standard':50 'state':85 'suit':100 'summar':120 'text':119 'token':129 'unclear':216 'unit':73 'usd':77 'usdc':14,28,58,75 'usdc-base' 'util':135 'valid':137 'via':37 'wallet':195 'wallet-connect':194 'web3':124 'without':203 'x402':2,16,39,51,103 'x402 API' 'x402-gated':1,15,102 'x402-payment'","prices":[{"id":"11136b3c-0fc3-45cb-83db-3f4fb8dbaf7a","listingId":"92600bdf-5919-4e0a-81b4-c606b5482f70","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:46.406Z"}],"sources":[{"listingId":"92600bdf-5919-4e0a-81b4-c606b5482f70","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:46.406Z","lastSeenAt":"2026-04-22T12:04:25.415Z"}],"details":{"listingId":"92600bdf-5919-4e0a-81b4-c606b5482f70","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/33 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/33"},{"claim":"The site advertises $0.02/request flat 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/33"}],"useCases":["Agents that need on-demand premium API access without pre-registration or API keys","Programmatic access to a subscription-style endpoint settled in USDC on Base","Integrating pay-per-call microservices into autonomous agent workflows"],"bestFor":["Agents or developers wanting keyless, pay-per-request API access","Users who prefer crypto (USDC on Base) micropayments over traditional billing","Quick integration with x402-compatible payment flows"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone requiring non-crypto payment methods (endpoint settles only in USDC on Base)","High-volume consumers who need bulk pricing or subscription discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.715Z"},"updatedAt":"2026-04-22T12:04:25.415Z"}}