{"id":"af6d8c30-96c8-4576-812b-4e84452309e4","shortId":"bMmcsp","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 specific resource path (`/api/v1/stripe/subscriptions/21`) suggests a subscription-tier or premium-level endpoint, distinct from the site's other per-call APIs. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 exact-payment scheme.\n\nThe x402 challenge advertises a maxAmountRequired of 20000 base units. USDC uses 6 decimals, so this converts to $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The site markets itself as requiring no API keys, no rate limits, and offering instant access. The provider hosts a broader catalog of endpoints spanning data & analytics, AI/ML (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation).\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, and no examples available. The exact functionality behind this particular \"Premium API Access\" endpoint is unclear from the available material; it may bundle or gate access to the other listed APIs, but this is not confirmed.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","no-api-key","premium-access"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC API access","lowpaymentfee","Base network API","crypto-paid API","402 payment API"],"warnings":["No OpenAPI spec or schema available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The exact functionality behind 'Premium API Access' at this path is unclear; it may differ from the other listed per-call endpoints","No examples or integration guides are provided by the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/21","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/21","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific 'Premium API Access' endpoint is undefined. The docs pages are empty beyond a wallet-connect 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'/api/v1/stripe/subscriptions/21':45 '/docs':174 '/pricing':176 '/readme':178 '/request':116 '0.02':103,115 '0x8335':76 '20000':92 '2913':77 '402 payment API' '6':97 'Base network API' 'USDC API access' 'access':6,20,36,135,211,224 'across':117 'advertis':88,111 'ai/ml':147 'analyt':146 'api':5,19,35,65,127,210,229 'avail':202,217 'base':8,22,71,93 'base-network' 'behind':37,206 'broader':140 'bundl':221 'call':64 'catalog':141 'challeng':87 'classif':150 'confirm':234 'connect':184 'consist':106 'content':190 'contract':75 'convers':167 'convert':101 'crypto-paid API' 'data':145 'decim':98 'distinct':56 'document':169 'embed':151 'endpoint':30,55,119,143,212 'estim':161 'exact':82,204 'exact-pay':81 'exampl':201 'exchang':156 'extrem':171 'feed':155 'financ':152 'flat':112 'function':205 'gas':160 'gate':3,17,223 'generat':168 'geocod':165 'host':138 'infrastructur':163 'instant':134 'key':128 'level':54 'limit':131 'list':228 'lowpaymentfee' 'lowpaymentfee.com':32 'market':122 'materi':218 'maxamountrequir':90 'may':220 'network':72 'no-api-key' 'offer':133 'openapi':194 'page':179 'paid':9,23 'particular':208 'path':44 'pay-per-request API' 'payment':66,83 'paywal':40 'per':11,25,63,104 'per-cal':62 'per-request':10,24 'per-request-pricing' 'premium':4,18,34,53,209 'premium-access' 'premium-level':52 'price':113,154 'prompt':186 'provid':33,137 'quot':159 'rate':130,157 'render':181 'request':12,26,105 'request/response':197 'requir':125 'resourc':43 'schema':198 'scheme':84 'sentiment':148 'settl':68 'site':59,109,121 'span':144 'spars':172 'spec':195 'specif':42 'subscript':49 'subscription-ti':48 'substant':189 'suggest':46 'summar':149 'tier':50 'token':158 'unclear':214 'unit':94 'usdc':14,28,74,95 'usdc-settlement' 'use':73,96 'util':164 'valid':166 'via':78 'wallet':185 'web3':153 'x402':2,16,39,80,86 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"780beb3d-025b-49d2-a5eb-fcb2ee51bf98","listingId":"af6d8c30-96c8-4576-812b-4e84452309e4","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:44.585Z"}],"sources":[{"listingId":"af6d8c30-96c8-4576-812b-4e84452309e4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:44.585Z","lastSeenAt":"2026-04-22T13:31:38.510Z"}],"details":{"listingId":"af6d8c30-96c8-4576-812b-4e84452309e4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/21 \\\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":"x402 challenge returns maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/21"},{"claim":"Site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/21"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API features without traditional API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Accessing bundled data, AI, or finance endpoints behind a single premium subscription gate"],"bestFor":["Developers or agents who want keyless, pay-per-call API access","Users already holding USDC on the Base network","Scenarios requiring low-friction, no-commitment API consumption"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-compatible wallet or USDC holdings","High-volume use cases where $0.02/request adds up significantly compared to subscription-based alternatives"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.875Z"},"updatedAt":"2026-04-22T13:31:38.510Z"}}