{"id":"4d76fdde-22ae-4713-ae54-cafcad23a80a","shortId":"7HqLPK","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 API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform use the x402 protocol on the Base network, accepting USDC payments with no API keys or rate limits required.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/65` is labeled \"Premium API Access\" in the x402 challenge. Its maximum cost per request is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The endpoint accepts POST requests and returns application/json responses. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network, with a timeout of 300 seconds.\n\nNotably, the endpoint path references \"stripe/subscriptions\" which is unusual for a crypto-settled x402 endpoint. The actual functionality behind this endpoint is not documented — the crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Without documentation or example responses, the precise behavior of this endpoint remains unclear. The platform's landing page lists many other endpoints at $0.02 each but does not specifically describe this subscription endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","json-response","post-method","per-call-pricing","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC api access","Base network api","micropayment api","premium subscription endpoint"],"warnings":["Endpoint functionality is entirely undocumented — the label 'Premium API Access' and path 'stripe/subscriptions/65' give no clear indication of what the endpoint actually does or returns.","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no substantive content.","The path references 'stripe/subscriptions' which is unusual for a crypto-settled x402 endpoint and may indicate a hybrid or placeholder setup.","No output schema, example responses, or input parameters are documented anywhere."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/65","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/65","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 confirmed) and pricing is clear ($0.02 USDC per call), but there is no documentation, no OpenAPI schema, no example request/response, and the actual functionality of this 'Premium API Access' endpoint is completely undocumented. The docs/pricing/API/README pages all render only a wallet-connect prompt with no useful 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'0.02':123,217 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '20':113 '300':148 '6':119 'Base network api' 'USDC api access' 'accept':83,127 'access':6,20,36,102 'actual':167 'addit':192 'address':138 'ai':62 'analyt':61 'api':5,19,35,57,88,101,179 'application/json':132 'base':8,22,81,115,142 'base-network' 'behavior':201 'behind':37,169 'call':12,26 'categori':58 'challeng':106 'connect':187 'content':193 'cost':109 'crawl':176 'crypto':162 'crypto-settl':161 'data':60 'decim':120 'describ':223 'doc':177 'document':174,195 'endpoint':30,46,71,96,126,152,165,171,204,215,226 'equal':122 'exampl':197 'financ':65 'function':168 'gate':3,17 'host':53 'includ':59 'infrastructur':68 'json-response' 'key':89 'label':99 'land':210 'learn':64 'limit':92 'list':212 'lowpaymentfee' 'lowpaymentfee.com':32,50 'machin':63 'mani':45,213 'maximum':108 'micropayment api' 'network':82,143 'no-api-key' 'notabl':150 'offer':47 'one':43 'page':182,211 'paid':9,23 'path':153 'pay-per-call api' 'payment':85,134 'paywal':40 'per':11,25,110 'per-cal':10,24 'per-call-pricing' 'platform':51,74,208 'post':128 'post-method' 'precis':200 'premium':4,18,34,100 'premium subscription endpoint' 'price':178 'prompt':189 'protocol':78 'provid':33 'rate':91 'readm':181 'refer':154 'remain':205 'request':111,129 'requir':93 'respons':133,198 'return':131,184 'second':149 'sent':136 'settl':163 'specif':95,222 'stripe/subscriptions':155 'subscript':225 'timeout':146 'unclear':206 'unit':116 'unusu':158 'usd':124 'usdc':14,28,84,118 'usdc-settlement' 'use':75 'util':69 'varieti':55 'wallet':188 'web3':66 'without':194 'x402':2,16,39,77,105,164 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b639a023-7fa3-4af6-8de3-737842883651","listingId":"4d76fdde-22ae-4713-ae54-cafcad23a80a","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:51.833Z"}],"sources":[{"listingId":"4d76fdde-22ae-4713-ae54-cafcad23a80a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:51.833Z","lastSeenAt":"2026-04-22T10:02:16.850Z"}],"details":{"listingId":"4d76fdde-22ae-4713-ae54-cafcad23a80a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/65\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC 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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/65"},{"claim":"Platform advertises $0.02 per 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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/65"},{"claim":"Docs, pricing, API, and README pages all show only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Integrating x402-compatible payment flows into automated pipelines"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-API-key access to paid endpoints"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring fiat-only payment rails with no crypto involvement","Anyone needing to understand the exact response schema before committing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.484Z"},"updatedAt":"2026-04-22T10:02:16.850Z"}}