{"id":"44397d2e-bf54-44cc-a1f9-f6d73665f7a7","shortId":"twmdGN","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\" behind an x402 payment wall. The endpoint is live and returns a standard x402 challenge requiring payment 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 USD per request.\n\nThe hosting site lowpaymentfee.com advertises a broad catalog of pay-per-call 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). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access via the Base network.\n\nHowever, this specific endpoint path (`/api/v1/stripe/subscriptions/55`) suggests a subscription-related resource rather than one of the catalog APIs listed on the homepage. There is no documentation explaining what this particular endpoint returns or what input it expects beyond a POST request. The docs, pricing, and API pages on the site are essentially empty (showing only a \"Connect wallet\" prompt), so the actual behavior of this endpoint is unknown. Treat this listing as a stub until more documentation or schema information becomes available.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-billing","post-endpoint","no-api-key"],"categories":["payments","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment","Base network API","lowpaymentfee","premium subscription endpoint"],"warnings":["No documentation available — docs, pricing, and API pages all render only a wallet-connect prompt.","Endpoint path '/api/v1/stripe/subscriptions/55' does not match any of the advertised catalog APIs on the homepage.","No input or output schema provided; actual response payload after payment is unknown.","The 'stripe/subscriptions' path naming is unusual for an x402-settled endpoint — purpose is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/55","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what it actually does, no input/output schema, and the site's docs pages are empty. The endpoint path suggests a subscription resource but nothing confirms its 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'0.02':77,126 '000':68 '20':67 '6':73 'Base network API' 'USDC micropayment' 'access':6,20,36,138 'actual':205 'advertis':85 'ai/ml':98 'amount':62 'analysi':100 'analyt':97 'api':5,19,35,94,131,161,189 'avail':225 'base':8,22,58,69,141 'becom':224 'behavior':206 'behind':37 'beyond':181 'broad':87 'call':12,26,65,93 'catalog':88,160 'challeng':51 'classif':102 'connect':200 'convers':119 'data':96 'decim':74 'doc':186 'document':169,220 'embed':103 'empti':196 'endpoint':30,43,122,146,174,209 'equal':76 'essenti':195 'estim':113 'exchang':108 'expect':180 'explain':170 'feed':107 'financ':104 'gas':112 'gate':3,17 'generat':120 'geocod':117 'homepag':165 'host':82 'howev':143 'inform':223 'infrastructur':115 'input':178 'instant':137 'key':132 'limit':135 'list':124,162,214 'live':45 'lowpaymentfee' 'lowpaymentfee.com':32,84 'maximum':61 'network':59,142 'no-api-key' 'one':157 'page':190 'paid':9,23 'particular':173 'path':147 'pay':91 'pay-per-cal':90 'pay-per-call API' 'payment':40,53 'per':11,25,64,79,92,127 'per-cal':10,24 'per-call-billing' 'post':183 'post-endpoint' 'premium':4,18,34 'premium subscription endpoint' 'price':106,187 'prompt':202 'provid':33 'quot':111 'rate':109,134 'rather':155 'relat':153 'request':80,128,184 'requir':52,63 'resourc':154 'return':47,175 'schema':222 'sentiment':99 'show':197 'site':83,193 'span':95 'specif':145 'standard':49 'stub':217 'subscript':152 'subscription-rel':151 'suggest':149 'summar':101 'token':110 'treat':212 'unit':70 'unknown':211 'usd':78 'usdc':14,28,55,72 'usdc-base' 'util':116 'valid':118 'via':139 'wall':41 'wallet':201 'web3':105 'x402':2,16,39,50 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a7050114-4393-4257-bf4f-a6a4498fb908","listingId":"44397d2e-bf54-44cc-a1f9-f6d73665f7a7","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:56:57.843Z"}],"sources":[{"listingId":"44397d2e-bf54-44cc-a1f9-f6d73665f7a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:56:57.843Z","lastSeenAt":"2026-04-22T08:31:38.147Z"}],"details":{"listingId":"44397d2e-bf54-44cc-a1f9-f6d73665f7a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/55\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","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 402 challenge requiring USDC on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/55"},{"claim":"The site 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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/stripe/subscriptions/55"},{"claim":"Docs, pricing, and API pages show only a 'Connect wallet' prompt with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for API access without traditional API keys or subscriptions","Agent-driven programmatic access to premium resources via x402 protocol","Accessing subscription-related data on the Base network with USDC micropayments"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or schemas before integrating","Production workloads requiring SLA guarantees or support","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:48.212Z"},"updatedAt":"2026-04-22T08:31:38.147Z"}}