{"id":"26980717-0798-4f66-bcb1-3482fd1b2002","shortId":"jNpJVP","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 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 behind x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/67` is listed as \"Premium API Access\" and costs up to 0.02 USDC per request (maxAmountRequired of 20,000 base units with USDC's 6 decimals). Payment is made via the x402 exact scheme: callers include an X-PAYMENT header with a signed payment to the provider's address on Base. No API keys, rate limits, or upfront commitments are required — access is instant upon payment.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. The endpoint's actual functionality behind the \"Premium API Access\" label is not documented — it is unclear what data or service is returned after payment. The POST method is specified in the outputSchema, and the response MIME type is application/json, but no request body schema or response schema is provided. Prospective users should test the endpoint to determine its actual behavior before relying on it in production.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-call-billing","no-api-key","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto-gated API"],"warnings":["No documentation available — all doc/pricing/README pages return only 'Connect wallet'","The actual functionality behind 'Premium API Access' is completely undocumented","No request body schema or response schema provided","The endpoint path '/api/v1/stripe/subscriptions/67' suggests a Stripe subscription resource but its purpose is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/67","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC per call), but there is no documentation of what the endpoint actually does, no request/response schema, and all doc pages return only 'Connect wallet'. The 'Premium API Access' label is opaque. This is effectively a stub 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'0.02':96 '000':103 '20':102 '6':109 'Base network API' 'USDC micropayment API' 'access':6,20,36,91,147,184 'actual':178,234 'address':134 'ai':62 'analyt':61 'api':5,19,35,58,90,138,159,183 'application/json':214 'base':8,22,80,104,136 'base-network' 'behavior':235 'behind':72,180 'bodi':218 'call':12,26 'caller':119 'commit':144 'connect':168 'content':174 'cost':93 'crawl':157 'crypto-gated API' 'data':60,193 'decim':110 'determin':232 'doc':158 'document':152,188 'endpoint':30,47,84,176,230 'exact':117 'extrem':154 'financ':65 'function':179 'gate':3,17,71 'header':125 'host':54 'includ':120 'infrastructur':68 'instant':149 'json-response' 'key':139 'label':185 'learn':64 'limit':141 'list':87 'lowpaymentfee' 'lowpaymentfee.com':32,51 'machin':63 'made':113 'mani':46 'maxamountrequir':100 'method':202 'micropay':74 'mime':211 'network':81 'no-api-key' 'offer':48 'one':44 'outputschema':207 'page':163 'paid':9,23 'pay-per-call API' 'payment':40,111,124,129,151,199 'per':11,25,98 'per-cal':10,24 'per-call-billing' 'platform':52 'post':201 'premium':4,18,34,89,182 'price':160 'product':241 'prompt':170 'prospect':225 'protocol':41 'provid':33,132,224 'rate':140 'readm':162 'reli':237 'request':99,217 'requir':146 'respons':210,221 'return':165,197 'schema':219,222 'scheme':118 'servic':195 'settl':75 'sign':128 'span':59 'spars':155 'specif':83 'specifi':204 'substant':173 'test':228 'type':212 'unclear':191 'unit':105 'upfront':143 'upon':150 'usdc':14,28,77,97,107 'usdc-micropayment' 'user':226 'util':69 'varieti':56 'via':37,114 'wallet':169 'web3':66 'x':123 'x-payment':122 'x402':2,16,39,73,116 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"67eb3859-11e3-401f-aab1-4ffd232ed743","listingId":"26980717-0798-4f66-bcb1-3482fd1b2002","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:50.003Z"}],"sources":[{"listingId":"26980717-0798-4f66-bcb1-3482fd1b2002","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:50.003Z","lastSeenAt":"2026-04-22T12:04:25.544Z"}],"details":{"listingId":"26980717-0798-4f66-bcb1-3482fd1b2002","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/67 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/67"},{"claim":"The 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 contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/67"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can sign USDC payments on Base for per-call access","Users who want keyless, commitment-free API access"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Anyone without a Base-compatible wallet holding USDC","High-volume consumers who prefer subscription or bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.597Z"},"updatedAt":"2026-04-22T12:04:25.544Z"}}