{"id":"735f79ce-9348-480c-943d-77314d8ea2ef","shortId":"4rWeMB","kind":"x402","title":"Premium API access via x402 payment on Base network, settling in USDC.","tagline":"Premium API access via x402 payment on Base network, settling in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated behind an x402 payment challenge. The endpoint accepts POST requests and settles payments in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform offers a suite of pay-per-request APIs spanning 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 advertised at $0.02 per request with no API keys, no rate limits, and instant access via the x402 protocol on Base.\n\nThe specific endpoint `/api/v1/stripe/subscriptions/139` is labeled \"Premium API Access\" but no further documentation describes what data or functionality it returns. The docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. Without schema documentation or example responses, the actual payload returned after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC gated endpoint","Base network API","lowpaymentfee","micropayment API","crypto payment API"],"warnings":["No documentation available describing what this endpoint returns after payment","Docs, pricing, and README pages render only 'Connect wallet' with no content","The endpoint path references 'stripe/subscriptions' which is unclear in context of x402 crypto payments","No response schema or example output available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/139","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/139","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 402 challenge correctly) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation on what the endpoint actually returns, no OpenAPI schema, no example responses, and the docs/pricing/README pages are all empty beyond a wallet connect prompt. The endpoint path ('stripe/subscriptions/139') is opaque and 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'0.02':70,125 '000':61 '20':60 '6':66 'Base network API' 'USDC gated endpoint' 'accept':41 'access':3,15,32,137,152 'actual':189 'addit':179 'advertis':123 'ai':94 'amount':55 'analysi':98 'analyt':88 'api':2,14,31,85,130,151 'base':8,20,51,62,143 'base-network' 'behind':34 'broader':74 'call':58 'challeng':38 'classif':101 'connect':174 'convers':118 'crypto payment API' 'data':87,91,159 'decim':67 'describ':157 'detail':181 'doc':165 'document':156,184 'embed':102 'endpoint':26,40,121,146 'equal':69 'estim':112 'exampl':186 'exchang':107 'export':92 'feed':106 'financ':103 'function':161 'gas':111 'gate':33 'generat':119 'geocod':116 'infrastructur':114 'insight':93 'instant':136 'key':131 'label':149 'learn':96 'limit':134 'lowpaymentfee' 'lowpaymentfee.com':28,75 'machin':95 'maximum':54 'metric':89 'micropayment API' 'network':9,21,52 'offer':77 'page':169 'pay':82 'pay-per-call API' 'pay-per-request':81 'payload':190 'payment':6,18,37,46,193 'per':57,71,83,126 'platform':76 'post':42 'post-method' 'premium':1,13,30,150 'price':105,166 'prompt':176 'protocol':141 'provid':29 'quot':110 'rate':108,133 'readm':168 'render':171 'report':90 'request':43,72,84,127 'requir':56 'respons':187 'return':163,191 'schema':183 'sentiment':97 'settl':10,22,45 'span':86 'specif':145 'suit':79 'summar':100 'technic':180 'text':99 'token':109 'unit':63 'unknown':195 'usdc':12,24,48,65 'usdc-settlement' 'util':115 'valid':117 'via':4,16,138 'wallet':175 'web3':104 'without':182 'x402':5,17,36,140 'x402 API' 'x402-payment'","prices":[{"id":"649a3d44-87b6-4542-93aa-0cdec9ac1226","listingId":"735f79ce-9348-480c-943d-77314d8ea2ef","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/139","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:21.699Z"}],"sources":[{"listingId":"735f79ce-9348-480c-943d-77314d8ea2ef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/139","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:21.699Z","lastSeenAt":"2026-04-22T18:32:18.049Z"}],"details":{"listingId":"735f79ce-9348-480c-943d-77314d8ea2ef","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/139 \\\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":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/139"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/139"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Integrating pay-as-you-go API access without traditional API keys or subscriptions","Agent-driven programmatic access to gated resources via x402 protocol"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users on Base network with USDC who want instant access without signup"],"notFor":["Users needing detailed API documentation or response schemas before purchasing","Applications requiring free-tier or trial access","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:49.951Z"},"updatedAt":"2026-04-22T18:32:18.049Z"}}