{"id":"4c17eccb-57db-405c-bd48-a890fd82cc76","shortId":"UEk6Ty","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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated via the x402 protocol on the Base network and settled in USDC.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/103` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's uniform $0.02/request pricing. Payment is made via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment authorization, and the endpoint returns an `application/json` response. No API keys or rate limits are advertised; access is instant upon payment.\n\nDocumentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the \"Premium API Access\" endpoint actually returns. The endpoint name suggests it may relate to Stripe subscription management, but this is speculative. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["x402-payment-gated","usdc-settlement","base-network","per-request-pricing","json-response","no-api-key-required"],"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, API, pricing, and README pages all show only 'Connect wallet' with no technical content.","No OpenAPI or schema describing request parameters or response format.","The endpoint path '/api/v1/stripe/subscriptions/103' suggests Stripe subscription functionality, but this is unconfirmed and may be misleading.","Actual functionality behind 'Premium API Access' is unknown — integrate with caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/103","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/103","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational and priced at $0.02/request in USDC on Base. However, there is no OpenAPI spec, no request/response documentation, no examples, and the endpoint's actual functionality (\"Premium API Access\") is completely undocumented. Docs pages render only a wallet-connect 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'/request':128 '0.02':118,127 '000':101 '0x8335':106 '20':100 '2913':107 '6':113 'Base network API' 'USDC API access' 'access':6,20,36,92,165,213 'actual':215 'addit':193 'advertis':164 'ai':61 'analyt':60 'api':5,19,35,57,91,158,179,212 'application/json':155 'attach':139 'author':149 'base':8,22,77,102,109 'base-network' 'behind':37 'call':12,26 'caller':138 'challeng':234 'confirm':241 'connect':188 'consist':121 'crypto-paid API' 'data':59 'decim':114 'detail':195 'doc':178 'document':170,204 'endpoint':30,46,85,152,214,218,243 'exact':136 'exampl':207 'extrem':175 'financ':64 'form':240 'gate':3,17,70 'header':144 'host':53 'infrastructur':67 'instant':167 'json-response' 'key':159 'learn':63 'limit':162 'list':88 'live':236 'lowpaymentfee' 'lowpaymentfee.com':32,50 'machin':62 'made':132 'manag':227 'mani':45 'may':222 'micropayment API' 'name':219 'network':78 'no-api-key-required' 'offer':47 'one':43 'openapi':199 'oper':245 'page':183 'paid':9,23 'pay-per-call API' 'payment':96,130,143,148,169 'paywal':40 'per':11,25,119 'per-cal':10,24 'per-request-pricing' 'platform':51,124 'premium':4,18,34,90,211 'price':129,180 'prompt':190 'protocol':74 'provid':33 'rate':161 'readm':182 'relat':223 'render':185 'request':120 'request/response':202 'requir':94 'respons':156 'return':153,216 'schema':203 'scheme':137 'settl':80 'sign':147 'sinc':110 'site':173 'span':58 'spec':200 'specif':84 'specul':231 'stripe':225 'subscript':226 'suggest':220 'technic':194 'thin':176 'translat':116 'uniform':126 'unit':103 'upon':168 'usdc':14,28,82,105,111 'usdc-settlement' 'use':112 'util':68 'varieti':55 'via':71,133 'wallet':189 'web3':65 'well':239 'well-form':238 'x':142 'x-payment':141 'x402':2,16,39,73,135,233 'x402 API' 'x402-gated':1,15 'x402-payment-gated'","prices":[{"id":"f1ad8369-9200-44c6-a4ff-72940899a127","listingId":"4c17eccb-57db-405c-bd48-a890fd82cc76","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/103","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:16.815Z"}],"sources":[{"listingId":"4c17eccb-57db-405c-bd48-a890fd82cc76","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/103","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:16.815Z","lastSeenAt":"2026-04-22T19:32:03.243Z"}],"details":{"listingId":"4c17eccb-57db-405c-bd48-a890fd82cc76","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a signed USDC authorization on Base.\n# Using curl (you need an x402-compatible client to construct the payment header):\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/103 \\\n  -H \"X-PAYMENT: <signed-x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/103"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/103"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic access to gated services settled on Base L2"],"bestFor":["Developers or agents wanting key-less, pay-per-use API access","Users already holding USDC on Base who want frictionless API calls","Automated workflows that need instant access without signup"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","Anyone looking for free or fiat-only payment options","Production use cases requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:50.084Z"},"updatedAt":"2026-04-22T19:32:03.243Z"}}