{"id":"bb3f366b-bc48-46ff-8217-c1775fb305db","shortId":"YcFBZE","kind":"x402","title":"Premium API access via x402 payment on Base network, settled in USDC.","tagline":"Premium API access via x402 payment on Base network, settled in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated behind an x402 payment challenge. The site hosts a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints use the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and instant access.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/146` is labeled \"Premium API Access\" in the x402 challenge. Its exact functionality beyond the generic label is unclear from available documentation — the site's docs, pricing, and API pages all require wallet connection and provide no further detail. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network.\n\nThe endpoint accepts POST requests and returns `application/json`. No input or output schema details are documented beyond the x402 challenge metadata. The site advertises no API keys required, no rate limits, and a simple pay-per-use model at $0.02 per request across all listed endpoints.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["premium api","x402 api","pay-per-call api","lowpaymentfee","USDC gated endpoint","base network api","crypto payment api"],"warnings":["No documentation available — all doc pages require wallet connection and show no content","The specific functionality of /api/v1/stripe/subscriptions/146 is unknown beyond the label 'Premium API Access'","No input or output schema documented","The endpoint path references 'stripe/subscriptions' which is unusual for an x402-gated endpoint — purpose unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/146","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/146","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/request in USDC on Base). However, there is no documentation of what this specific endpoint actually does, no input/output schema, no examples, and the docs pages all just show 'Connect wallet' with no content. The 'Premium API Access' label is generic and 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'0.02':143,196 '000':134 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '20':133 '6':139 'USDC gated endpoint' 'accept':70,158 'access':3,15,32,82,91 'across':199 'address':150 'advertis':179 'ai/ml':53 'analyt':52 'api':2,14,31,49,75,90,114,181 'application/json':163 'avail':106 'base':8,20,68,135,154 'base network api' 'behind':34 'beyond':99,172 'challeng':38,95,127,175 'collect':43 'connect':119 'cost':131 'crypto payment api' 'data':51,56 'decim':140 'detail':124,169 'doc':111 'document':107,171 'endpoint':26,61,85,157,202 'equal':142 'exact':97 'finance/web3':55 'function':98 'gate':33 'generic':101 'host':41 'indic':128 'infer':54 'infrastructur':58 'input':165 'instant':81 'json-response' 'key':76,182 'label':88,102 'limit':79,186 'list':201 'lowpaymentfee' 'lowpaymentfee.com':28 'made':148 'maximum':130 'metadata':176 'model':194 'network':9,21,69,155 'no-api-key' 'output':167 'page':115 'pay':46,191 'pay-per-call api' 'pay-per-request':45 'pay-per-us':190 'payment':6,18,37,72,146 'per':47,144,192,197 'post':159 'post-method' 'premium':1,13,30,89 'premium api' 'price':112 'protocol':65 'provid':29,121 'rate':78,185 'request':48,145,160,198 'requir':117,183 'return':162 'schema':168 'settl':10,22 'simpl':189 'site':40,109,178 'span':50 'specif':84 'unclear':104 'unit':136 'usdc':12,24,71,138 'usdc-base-network' 'use':62,193 'util':59 'via':4,16 'wallet':118 'x402':5,17,36,64,94,126,174 'x402 api' 'x402-payment'","prices":[{"id":"f3ad27e0-1a5a-444a-81b5-e40c4b35ded4","listingId":"bb3f366b-bc48-46ff-8217-c1775fb305db","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/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:31.903Z"}],"sources":[{"listingId":"bb3f366b-bc48-46ff-8217-c1775fb305db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:31.903Z","lastSeenAt":"2026-04-22T15:02:03.356Z"}],"details":{"listingId":"bb3f366b-bc48-46ff-8217-c1775fb305db","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/146 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/146"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/146"}],"useCases":["Accessing premium API features without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-use endpoints into agent workflows without subscriptions"],"bestFor":["Developers wanting instant API access without signup","Agents that can settle x402 payments in USDC on Base","Use cases requiring no rate limits and no commitments"],"notFor":["Users who need detailed API documentation before purchasing","Applications requiring non-crypto payment methods","Developers needing well-documented input/output schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.405Z"},"updatedAt":"2026-04-22T15:02:03.356Z"}}