{"id":"a251cff3-b03a-420f-a57a-bc262aa8619b","shortId":"JfpGLV","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is located at `/api/v1/stripe/subscriptions/40` and returns a valid 402 challenge when called without payment, confirming it is live. The challenge specifies payment of up to 20,000 base units of USDC (0x8335…2913 on Base network), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs across 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) — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific endpoint's path (`/stripe/subscriptions/40`) suggests it may relate to a subscription or premium tier rather than one of the individually listed utility endpoints. The exact response payload and functionality of this particular endpoint are not documented in the crawled material.\n\nDocumentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas, parameter descriptions, and usage examples are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","no-api-key","premium-access"],"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 documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content.","The endpoint path '/api/v1/stripe/subscriptions/40' suggests a subscription-related resource, but its exact functionality and response schema are undocumented.","No OpenAPI spec, no AI plugin manifest, and no agents.txt found.","Cannot confirm what data or service is returned after successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/40","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/40","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 documentation for this specific endpoint's functionality, no request/response schema, and all doc pages are empty. The endpoint path suggests a subscription resource but its actual behavior is 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'/api/v1/stripe/subscriptions/40':46 '/docs':193 '/pricing':194 '/readme':196 '/stripe/subscriptions/40':154 '0.02':81,135 '000':69 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':98 '0x8335':74 '20':68 '2913':75 '402':51 '6':86 'Base network API' 'USDC API access' 'access':6,20,36 'across':108 'address':97 'advertis':103 'ai/ml':110 'analysi':112 'api':5,19,35,107,140 'base':8,22,70,77 'broader':100 'call':12,26,54 'challeng':52,62 'classif':114 'commit':147 'confirm':57 'connect':201 'content':207 'convers':130 'crawl':189 'crypto-paid API' 'data/analytics':109 'decim':87 'descript':213 'detail':209 'document':186,191 'embed':115 'endpoint':30,151,173,183 'equal':80 'estim':124 'exact':94,175 'exampl':216 'exchang':119 'feed':118 'finance/web3':116 'function':179 'gas':123 'gate':3,17 'generat':131 'geocod':128 'howev':148 'individu':170 'infrastructur':126 'key':141 'limit':144 'list':171 'live':60 'locat':44 'lowpaymentfee' 'lowpaymentfee.com':32,101 'made':90 'materi':190 'may':157 'micropayment API' 'network':78 'no-api-key' 'one':167 'page':192 'paid':9,23 'paramet':212 'particular':182 'path':153 'pay-per-call API' 'payload':177 'payment':40,56,64,88 'per':11,25,82,136 'per-cal':10,24 'per-call-pricing' 'platform':102 'premium':4,18,34,163 'premium-access' 'price':117,133 'prompt':203 'protocol':41 'provid':33 'quot':122 'rate':120,143 'rather':165 'relat':158 'request':83,137 'request/response':210 'respons':176 'return':48,198 'schema':211 'scheme':95 'sentiment':111 'specif':150 'specifi':63 'subscript':161 'substant':206 'suggest':155 'suit':105 'summar':113 'tier':164 'token':121 'unavail':218 'unit':71 'usag':215 'usdc':14,28,73,84 'usdc-base' 'use':85 'util':127,172 'valid':50,129 'via':37,91 'wallet':202 'without':55 'x402':2,16,39,93 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"2aabf0af-88d7-4104-8c74-c305ca2c777d","listingId":"a251cff3-b03a-420f-a57a-bc262aa8619b","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:56.021Z"}],"sources":[{"listingId":"a251cff3-b03a-420f-a57a-bc262aa8619b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:56.021Z","lastSeenAt":"2026-04-22T10:02:17.018Z"}],"details":{"listingId":"a251cff3-b03a-420f-a57a-bc262aa8619b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/40\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"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/40","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid 402 challenge with x402Version 1, exact scheme, USDC on Base, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/40"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and 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/40"}],"useCases":["Programmatic access to premium API features paid per-call in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Integrating x402-compatible payment flows into automated pipelines"],"bestFor":["Developers or agents with USDC on Base who want frictionless per-call API access","Projects that prefer crypto micropayments over traditional API key subscriptions","x402-native agent toolchains looking for low-cost endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.268Z"},"updatedAt":"2026-04-22T10:02:17.018Z"}}