{"id":"52353b5c-b338-4fba-8c1d-7ea3f44c89d7","shortId":"erNxYe","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 located at `/api/v1/stripe/subscriptions/149` and returns a valid 402 challenge when called without payment, confirming it is live. The challenge specifies payment in USDC on the Base network, with a maximum amount of 20,000 base units (0.02 USDC, i.e. $0.02 per request). The payment scheme is \"exact\" and settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.\n\nThe broader lowpaymentfee.com platform advertises a range of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and instant access. However, the specific endpoint `/api/v1/stripe/subscriptions/149` is labeled \"Premium API Access\" and its exact functionality is not documented beyond that label. The URL path suggests it may relate to Stripe subscription management, but no schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause the endpoint's actual behavior behind the paywall is undocumented, agents should treat this as a stub listing. The x402 challenge is well-formed and the endpoint is confirmed live, but what it returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-billing","premium-api-access"],"categories":["other"],"synonyms":["premium API","x402 endpoint","USDC API","Base network API","pay-per-call API","lowpaymentfee","stripe subscriptions"],"warnings":["Endpoint functionality behind the paywall is completely undocumented","No request or response schema available","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content","The URL path '/api/v1/stripe/subscriptions/149' suggests Stripe subscription management but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/149","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/149","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts USDC on Base at $0.02. However, there is no documentation of what the endpoint actually does, no request/response schema, and no examples. The docs pages are empty. This is effectively a 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'0.02':80,83,120 '000':77 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':95 '20':76 '402':51 'Base network API' 'USDC API' 'access':6,20,36,132,142 'actual':199 'address':94 'advertis':100 'agent':206 'ai':109 'amount':74 'analyt':108 'api':5,19,35,104,125,141,179 'base':8,22,69,78 'behavior':200 'behind':201 'beyond':150 'broader':97 'call':12,26,54 'categori':105 'challeng':52,62,216 'confirm':57,225 'connect':188 'content':194 'crawl':176 'data':107 'detail':170 'doc':178 'document':149,171 'endpoint':30,136,197,223 'exact':90,145 'exampl':168 'financ':112 'form':220 'found':173 'function':146 'gate':3,17 'howev':133 'i.e':82 'includ':106 'infrastructur':115 'instant':131 'key':126 'label':139,152 'learn':111 'limit':129 'list':213 'live':60,226 'locat':44 'lowpaymentfee' 'lowpaymentfee.com':32,98 'machin':110 'manag':163 'maximum':73 'may':158 'network':70 'page':183 'paid':9,23 'path':155 'pay-per-call API' 'payment':40,56,64,87,232 'paywal':203 'per':11,25,84,121 'per-cal':10,24 'per-call-billing' 'platform':99 'premium':4,18,34,140 'premium API' 'premium-api-access' 'price':118,180 'prompt':190 'protocol':41 'provid':33 'rang':102 'rate':128 'readm':182 'relat':159 'request':85,122 'request/response':167 'return':48,185,230 'schema':166 'scheme':88 'settl':92 'specif':135 'specifi':63 'stripe':161 'stripe subscriptions' 'stub':212 'subscript':162 'substant':193 'suggest':156 'treat':208 'undocu':205 'unit':79 'unknown':234 'url':154 'usdc':14,28,66,81 'usdc-base' 'util':116 'valid':50 'via':37 'wallet':189 'web3':113 'well':219 'well-form':218 'without':55 'x402':2,16,39,215 'x402 endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1a26a6e9-d37a-464b-ac24-5480f16e3fc9","listingId":"52353b5c-b338-4fba-8c1d-7ea3f44c89d7","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/149","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:22.909Z"}],"sources":[{"listingId":"52353b5c-b338-4fba-8c1d-7ea3f44c89d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/149","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:22.909Z","lastSeenAt":"2026-05-03T01:05:11.289Z"}],"details":{"listingId":"52353b5c-b338-4fba-8c1d-7ea3f44c89d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/149 \\\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 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/149"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/149"}],"useCases":["Paying per-call for premium API access using USDC on Base","Integrating x402-gated endpoints into agent workflows","Accessing a subscription-related resource without traditional API keys"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers exploring x402 pay-per-call patterns","Use cases requiring keyless, instant API access"],"notFor":["Users who need detailed API documentation before purchasing","Applications requiring known, well-documented response schemas","Non-crypto payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.844Z"},"updatedAt":"2026-05-03T01:05:11.289Z"}}