{"id":"be86e15f-32fd-47ff-93ee-052fcdc0fcb8","shortId":"Cqqzu8","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request 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/18` is listed as \"Premium API Access\" with a maximum cost of 20,000 base units of USDC (0.02 USD per request). The x402 challenge confirms the endpoint is live, accepts POST requests, and pays to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The asset is USDC at contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. No API keys or rate limits are advertised; access is purely pay-per-call.\n\nHowever, the actual functionality behind this specific endpoint is unclear. The path suggests it relates to Stripe subscriptions, but the crawled documentation is extremely thin — most pages only show a \"Connect wallet\" prompt with no further detail. There is no OpenAPI schema, no request/response examples, and no documentation explaining what data this endpoint returns or what input it expects. The platform's landing page lists many endpoints at $0.02 each but provides no deeper technical documentation for any of them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC gated endpoint","Base network API","micropayment API","stripe subscription API"],"warnings":["No documentation available — all doc/pricing/API pages only show 'Connect wallet' with no content","No OpenAPI or input/output schema provided; request format is unknown","The endpoint path '/api/v1/stripe/subscriptions/18' suggests Stripe subscription functionality but this is unconfirmed","No examples of request or response payloads available anywhere in crawled content","Platform appears to list many endpoints but none have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/18","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is virtually no documentation about what this endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI schema, no examples, and most doc pages are blank beyond a wallet-connect prompt. The path name 'stripe/subscriptions/18' is opaque. This is effectively a stub 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'0.02':104,216 '000':99 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':123 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':132 '20':98 'Base network API' 'USDC gated endpoint' 'accept':116 'access':6,20,36,92,141 'actual':150 'address':122 'advertis':140 'ai':61 'analyt':60 'api':5,19,35,57,91,134 'asset':127 'base':8,22,77,100,125 'base-network' 'behind':37,152 'call':147 'challeng':110 'confirm':111 'connect':178 'contract':131 'cost':96 'crawl':168 'data':59,198 'deeper':221 'detail':184 'document':169,195,223 'endpoint':30,46,85,113,155,200,214 'exampl':192 'expect':206 'explain':196 'extrem':171 'financ':64 'function':151 'gate':3,17,70 'host':53 'howev':148 'infrastructur':67 'input':204 'key':135 'land':210 'learn':63 'limit':138 'list':88,212 'live':115 'lowpaymentfee' 'lowpaymentfee.com':32,50 'machin':62 'mani':45,213 'maximum':95 'micropayment API' 'network':78 'offer':47 'one':43 'openapi':188 'page':174,211 'paid':9,23 'path':159 'pay':120,145 'pay-per-cal':144 'pay-per-call api' 'pay-per-request' 'paywal':40 'per':11,25,106,146 'per-request':10,24 'platform':51,208 'post':117 'post-method' 'premium':4,18,34,90 'prompt':180 'protocol':74 'provid':33,219 'pure':143 'rate':137 'relat':162 'request':12,26,107,118 'request/response':191 'return':201 'schema':189 'settl':80 'show':176 'span':58 'specif':84,154 'stripe':164 'stripe subscription API' 'subscript':165 'suggest':160 'technic':222 'thin':172 'unclear':157 'unit':101 'usd':105 'usdc':14,28,82,103,129 'usdc-settlement' 'util':68 'varieti':55 'via':71 'wallet':179 'web3':65 'x402':2,16,39,73,109 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"3bb63cb2-b113-4a36-88ca-09f0a9e79ca8","listingId":"be86e15f-32fd-47ff-93ee-052fcdc0fcb8","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:38.512Z"}],"sources":[{"listingId":"be86e15f-32fd-47ff-93ee-052fcdc0fcb8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:38.512Z","lastSeenAt":"2026-04-22T13:31:38.249Z"}],"details":{"listingId":"be86e15f-32fd-47ff-93ee-052fcdc0fcb8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/18 \\\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/18"},{"claim":"The 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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/18"}],"useCases":["Programmatic access to a premium API endpoint without requiring API keys or account registration","Agent-driven workflows that need to pay per-call in USDC on Base","Exploring x402-protocol-based API monetization patterns"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, pay-per-request API access"],"notFor":["Production workloads requiring well-documented, stable APIs with clear schemas","Users who need to understand exact request/response formats before paying","Anyone needing free or fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.144Z"},"updatedAt":"2026-04-22T13:31:38.249Z"}}