{"id":"52c7cb1d-39fb-4b54-9ec9-61a3e6b3e800","shortId":"44eLSa","kind":"x402","title":"Premium API access via x402 on Base, paid per-request in USDC.","tagline":"Premium API access via x402 on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific endpoint `/api/v1/stripe/subscriptions/4` is listed as a premium tier, requiring a payment of up to $0.02 USDC (20,000 base units with 6 decimals) per request on the Base network. The payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs across several categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access.\n\nHowever, the specific functionality behind this particular endpoint (`/api/v1/stripe/subscriptions/4`) is unclear. The URL path suggests it relates to Stripe subscription management, but no documentation, request/response schemas, or usage examples are available. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation, the actual behavior and output of this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","no-api-key","on-chain-settlement"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","crypto-paid API","micropayment API"],"warnings":["No API documentation available — all doc pages return only a 'Connect wallet' prompt","The endpoint path '/api/v1/stripe/subscriptions/4' suggests Stripe subscription management but this is not confirmed anywhere","No request body schema or response schema is documented","No examples of successful responses are available","The relationship between this 'Premium API Access' endpoint and the other listed APIs on the site is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC per request on Base). However, there is no documentation, no request/response schema, no examples, and the actual functionality behind this specific endpoint path is ambiguous. Docs pages returned only 'Connect wallet' with no 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'0.02':56,134 '000':59 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':80 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':83 '20':58 '6':63 'Base network API' 'USDC API access' 'access':3,16,34,146 'across':93 'actual':200 'address':79 'advertis':88 'ai':103 'analysi':107 'analyt':97 'api':2,15,33,92,139,180 'avail':177 'base':7,20,60,69 'behavior':201 'behind':151 'broader':85 'cannot':207 'categori':95 'chain':77 'classif':110 'confirm':209 'connect':189 'content':195 'convers':127 'crypto-paid API' 'data':96,100 'decim':64 'doc':179 'document':170,198 'embed':111 'endpoint':28,42,130,154,206 'estim':121 'exampl':175 'exchang':116 'export':101 'feed':115 'financ':112 'function':150 'gas':120 'generat':128 'geocod':125 'howev':147 'infrastructur':123 'insight':102 'instant':145 'key':140 'learn':105 'limit':143 'list':45,132 'lowpaymentfee' 'lowpaymentfee.com':30,86 'machin':104 'manag':167 'metric':98 'micropayment API' 'network':70 'no-api-key' 'on-chain':75 'on-chain-settlement' 'output':203 'page':184 'paid':8,21 'particular':153 'path':160 'pay-per-call API' 'payment':38,52,72 'per':10,23,65,135 'per-request':9,22 'per-request-billing' 'platform':87 'premium':1,14,32,48 'price':114,181 'prompt':191 'protocol':39 'provid':31 'quot':119 'rate':117,142 'readm':183 'relat':163 'report':99 'request':11,24,66,136 'request/response':171 'requir':50 'return':186 'schema':172 'sentiment':106 'settl':74 'sever':94 'specif':41,149 'stripe':165 'subscript':166 'substant':194 'suggest':161 'suit':90 'summar':109 'text':108 'tier':49 'token':118 'unclear':157 'unit':61 'url':159 'usag':174 'usdc':13,26,57,82 'usdc-base' 'use':81 'util':124 'valid':126 'via':4,17,35 'wallet':190 'web3':113 'without':196 'x402':5,18,37 'x402 API' 'x402-payment'","prices":[{"id":"24c3be8b-28ec-4343-a361-e352902285bb","listingId":"52c7cb1d-39fb-4b54-9ec9-61a3e6b3e800","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:48.851Z"}],"sources":[{"listingId":"52c7cb1d-39fb-4b54-9ec9-61a3e6b3e800","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:48.851Z","lastSeenAt":"2026-04-22T11:32:12.724Z"}],"details":{"listingId":"52c7cb1d-39fb-4b54-9ec9-61a3e6b3e800","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/4 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/4"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/4"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API features with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","On-chain settled API calls for auditable usage"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer on-chain USDC micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring free or fiat-only payment methods","Production workloads that need well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.648Z"},"updatedAt":"2026-04-22T11:32:12.724Z"}}