{"id":"8102a08c-5708-4cbf-9e64-15ae8c0f55df","shortId":"x9jLZu","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 endpoint path (`/api/v1/stripe/subscriptions/157`) suggests a subscription-related resource, though the x402 challenge indicates it operates on a per-request payment model using USDC on the Base network.\n\nThe provider lowpaymentfee.com hosts a broader suite of APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Most listed endpoints are priced at $0.02 per request. However, this particular endpoint's x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide pricing.\n\nThe endpoint accepts POST requests, settles payments in USDC on Base (contract 0x8335…2913), and requires no API keys or rate limits according to the provider's landing page. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no substantive content, so the exact request/response schema for this endpoint is unknown. The \"subscriptions/157\" path naming is ambiguous — it may relate to Stripe subscription management or simply be an internal resource identifier.","tags":[],"capabilities":["x402-payment","usdc-on-base","per-request-billing","premium-api-access","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","crypto-paid API","subscription endpoint"],"warnings":["No API documentation available — all doc/pricing/README pages return only a 'Connect wallet' prompt with no substantive content.","The exact purpose and request/response schema of /api/v1/stripe/subscriptions/157 is unknown; the 'Premium API Access' description is generic.","No OpenAPI spec or output schema details beyond the basic x402 challenge metadata.","The 'stripe/subscriptions' path naming is ambiguous — unclear whether this actually interacts with Stripe or is just an internal naming convention."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/157","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no request/response examples, and the purpose of this specific endpoint (subscriptions/157) is unclear. Most doc pages returned only 'Connect wallet' with no 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'0.02':113,137 '000':128 '0x8335':157 '20':127 '2913':158 '6':133 'Base network API' 'USDC API access' 'accept':147 'access':6,20,36 'accord':167 'advertis':123 'ai/ml':84 'ambigu':205 'analysi':86 'analyt':83 'api':5,19,35,80,162 'base':8,22,70,129,155 'behind':37 'beyond':176 'broader':77 'challeng':55,122 'classif':88 'connect':183 'consist':138 'content':189 'contract':156 'convers':105 'crypto-paid API' 'data':82 'decim':134 'document':174 'embed':89 'endpoint':30,43,109,119,146,197 'equal':136 'estim':99 'exact':192 'exchang':94 'feed':93 'financ':90 'gas':98 'gate':3,17 'generat':106 'geocod':103 'host':75 'howev':116 'identifi':219 'indic':56 'infrastructur':101 'intern':217 'key':163 'land':172,178 'limit':166 'list':108 'lowpaymentfee' 'lowpaymentfee.com':32,74 'manag':212 'maxamountrequir':125 'may':207 'model':65 'name':203 'network':71 'no-api-key' 'oper':58 'page':173,175,179 'paid':9,23 'particular':118 'path':44,202 'pay-per-request API' 'payment':64,151 'paywal':40 'per':11,25,62,114 'per-request':10,24,61 'per-request-billing' 'post':148 'post-endpoint' 'premium':4,18,34 'premium-api-access' 'price':92,111,144 'prompt':185 'provid':33,73,170 'quot':97 'rate':95,165 'relat':50,208 'request':12,26,63,115,149 'request/response':193 'requir':160 'resourc':51,218 'return':180 'schema':194 'sentiment':85 'settl':150 'simpli':214 'site':142 'site-wid':141 'span':81 'specif':42 'stripe':210 'subscript':49,211 'subscription endpoint' 'subscription-rel':48 'subscriptions/157':201 'substant':188 'suggest':46 'suit':78 'summar':87 'though':52 'token':96 'unit':130 'unknown':199 'usdc':14,28,67,132,153 'usdc-on-base' 'use':66 'util':102 'valid':104 'wallet':184 'web3':91 'wide':143 'x402':2,16,39,54,121 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5b304bc5-faa2-46b6-88b4-fd642ba4aa46","listingId":"8102a08c-5708-4cbf-9e64-15ae8c0f55df","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:31.281Z"}],"sources":[{"listingId":"8102a08c-5708-4cbf-9e64-15ae8c0f55df","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/157","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:31.281Z","lastSeenAt":"2026-04-22T16:31:56.173Z"}],"details":{"listingId":"8102a08c-5708-4cbf-9e64-15ae8c0f55df","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/157 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/157"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/157"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic subscription or premium resource retrieval without traditional auth"],"bestFor":["Developers who want to pay per request without API key management","AI agents with USDC on Base that need on-demand premium data","Users seeking low-friction, crypto-native API access at $0.02/call"],"notFor":["Users who need detailed API documentation or well-defined schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or subscription discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.491Z"},"updatedAt":"2026-04-22T16:31:56.173Z"}}