{"id":"2158c870-1533-4fd3-903a-b3db04216f97","shortId":"6upVek","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. The site hosts a broad suite of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Most endpoints are listed at $0.02 per request.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/75` returns a live x402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 USD (USDC uses 6 decimals). Payment is made via the x402 \"exact\" scheme to the specified payTo address. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoint actually returns. The endpoint path suggests it relates to Stripe subscription management, but no details about the request body format or response payload are available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API","crypto-gated API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI spec or request/response schema provided","Endpoint purpose unclear — path suggests Stripe subscription management but no details are available","The site lists many endpoints but none have documented schemas or example payloads"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/75","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does, what request body it expects, or what it returns. The /docs and other pages are empty beyond a wallet connect prompt. The endpoint path ('stripe/subscriptions/75') is opaque without further context. Effectively a stub 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'/api/v1/stripe/subscriptions/75':91 '/docs':165 '/pricing':166 '/readme':169 '0.02':85,116 '000':103 '0x8335':108 '20':102 '2913':109 '6':120 'Base network API' 'USDC API access' 'accept':137 'access':6,20,36,151 'actual':198 'address':134 'advertis':150 'ai/ml':56 'analysi':59 'analyt':55 'api':5,19,35,52,144 'application/json':142 'avail':222 'base':8,22,104,112 'behind':37 'bodi':216 'broad':45 'call':51 'challeng':96 'classif':61 'connect':175 'content':181 'convers':78 'crawl':225 'crypto-gated API' 'data':54 'decim':121 'detail':212 'document':160,190 'embed':62 'endpoint':30,81,90,136,197,201 'equal':115 'estim':72 'exact':128 'exampl':193 'exchang':67 'extrem':162 'feed':66 'financ':63 'format':217 'gas':71 'gate':3,17,153 'generat':79 'geocod':76 'header':159 'host':43 'infer':57 'infrastructur':74 'json-api' 'key':145 'limit':148 'list':83 'live':94 'lowpaymentfee' 'lowpaymentfee.com':32 'made':124 'manag':209 'materi':226 'micropayment API' 'network':113 'openapi':185 'page':170 'paid':9,23 'path':202 'pay':49 'pay-per-cal':48 'pay-per-call API' 'pay-per-request' 'payload':220 'payment':98,122,158 'payto':133 'paywal':40 'per':11,25,50,86 'per-request':10,24 'post':138 'post-method' 'premium':4,18,34 'price':65 'prompt':177 'provid':33 'pure':154 'quot':70 'rate':68,147 'relat':205 'render':172 'request':12,26,87,97,139,215 'request/response':188 'respons':219 'return':92,141,199 'schema':189 'scheme':129 'sentiment':58 'site':42 'span':53 'spars':163 'spec':186 'specif':89 'specifi':132 'stripe':207 'subscript':208 'suggest':203 'suit':46 'summar':60 'token':69 'unit':105 'usd':117 'usdc':14,28,107,118 'usdc-base' 'use':119 'util':75 'valid':77 'via':125 'wallet':176 'web3':64 'x402':2,16,39,95,127,157 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f84cc076-68ed-441b-89d1-230cacf0b569","listingId":"2158c870-1533-4fd3-903a-b3db04216f97","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:51.208Z"}],"sources":[{"listingId":"2158c870-1533-4fd3-903a-b3db04216f97","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:51.208Z","lastSeenAt":"2026-04-22T10:32:09.870Z"}],"details":{"listingId":"2158c870-1533-4fd3-903a-b3db04216f97","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/75 \\\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 live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/75"},{"claim":"Most endpoints on the site are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/75"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without API keys or account registration","Programmatic access to subscription-related data or operations"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users comfortable paying in USDC on the Base L2 network"],"notFor":["Users needing detailed API documentation or schemas before integrating","Anyone requiring fiat-only payment methods with no crypto wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.482Z"},"updatedAt":"2026-04-22T10:32:09.870Z"}}