{"id":"431d7ade-d74f-4a62-8d83-f719c106b277","shortId":"ubcks2","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 part of a broader platform offering multiple API categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated via the x402 protocol on the Base network, settled in USDC.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/198` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme to the specified payTo address, with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no description of what data or functionality this particular endpoint actually returns. The endpoint name (\"stripe/subscriptions\") suggests it may relate to Stripe subscription management, but this is unconfirmed. Prospective users should be aware that the actual behavior of this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","post-method","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; actual endpoint behavior is unknown.","Endpoint path suggests Stripe subscription functionality but this is unconfirmed and undocumented.","No examples of expected input or output are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/198","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge), but there is virtually no documentation — no OpenAPI spec, no request/response schemas, no explanation of what the endpoint actually does. The docs pages are empty beyond a wallet-connect prompt. The endpoint path ('stripe/subscriptions/198') is opaque and 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'0.02':109 '000':98 '0x8335':103 '20':97 '2913':104 '300':131 '402 payment endpoint' '6':114 'Base network API' 'USDC API access' 'accept':86 'access':6,20,36,84,142 'actual':201,226 'address':128 'advertis':141 'ai':54 'analyt':53 'api':5,19,35,50,83,135,161 'awar':223 'base':8,22,70,99,106 'base-network' 'behavior':227 'behind':37 'beyond':185 'broader':46 'categori':51 'challeng':91 'connect':170 'content':176 'cost':95 'crypto-paid API' 'data':52,195 'decim':115 'descript':192 'doc':160 'document':155 'endpoint':30,77,200,204,230 'equal':108 'exact':122 'extrem':157 'financ':57 'function':197 'gate':3,17,63 'header':154 'includ':148 'indic':92 'infrastructur':60 'instant':144 'key':136 'learn':56 'limit':139 'list':80 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':55 'made':118 'manag':214 'maximum':94 'may':209 'multipl':49 'name':205 'network':71 'no-api-key' 'offer':48 'openapi':180 'outputschema':188 'page':165 'paid':9,23 'part':43 'particular':199 'pay-per-request API' 'payment':116,146,153 'payto':127 'paywal':40 'per':11,25,110 'per-request':10,24 'per-request-billing' 'platform':47 'post':87 'post-method' 'premium':4,18,34,82 'price':162 'prompt':172 'prospect':219 'protocol':67 'provid':33 'rate':138 'readm':164 'relat':210 'render':167 'request':12,26,88,111 'request/response':183 'return':202 'schema':184 'scheme':123 'second':132 'settl':72 'spars':158 'spec':181 'specif':76 'specifi':126 'stripe':212 'stripe/subscriptions':206 'stub':189 'subscript':213 'substant':175 'suggest':207 'timeout':133 'unconfirm':218 'undocu':232 'unit':100 'usdc':14,28,74,102,112 'usdc-settlement' 'use':113 'user':220 'util':61 'via':64,119 'wallet':171 'web3':58 'x':152 'x-payment':151 'x402':2,16,39,66,90,121,187 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"3fff3358-429a-4d1a-862e-8d7ab68150c0","listingId":"431d7ade-d74f-4a62-8d83-f719c106b277","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:42.803Z"}],"sources":[{"listingId":"431d7ade-d74f-4a62-8d83-f719c106b277","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/198","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:42.803Z","lastSeenAt":"2026-04-22T13:31:38.447Z"}],"details":{"listingId":"431d7ade-d74f-4a62-8d83-f719c106b277","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/198 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/198"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/198"}],"useCases":["Programmatic access to a premium API endpoint without traditional API key registration","Agent-driven workflows that need to pay per-call using USDC on Base","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents with USDC wallets on Base seeking pay-per-call endpoints","Users who want keyless, instant API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone looking for a well-documented, production-grade API with clear response schemas","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.917Z"},"updatedAt":"2026-04-22T13:31:38.447Z"}}