{"id":"941e6bbb-55c7-4649-bc37-d4c6cbdf75a2","shortId":"DyZeSd","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 paywall. The site hosts a broad catalog of pay-per-request 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 priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/stripe/charges/62` is labeled \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, 6 decimals), which equals $0.02 per call. Payment is made via the x402 \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but the lack of documentation makes it difficult to determine the actual functionality behind the \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-method","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC api access","Base network api","micropayment api","premium api"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or request/response schema provided","The actual functionality of this specific endpoint is unknown; 'Premium API Access' is not descriptive","The URL path includes 'stripe/charges' which may indicate a payment-related endpoint rather than a general API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/62","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/charges/62","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 documentation is essentially nonexistent — docs/pricing/API pages all show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the endpoint actually does beyond the generic label 'Premium API Access'. The specific functionality of this particular route (/api/v1/stripe/charges/62) is 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'0.02':84,138 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':133 '20':126 '300':154 '402':204 '6':134 'Base network api' 'USDC api access' 'accept':115 'access':6,20,36,113,223 'actual':195,217 'address':150 'advertis':121 'ai/ml':56 'amount':124 'analysi':58 'analyt':55 'api':5,19,35,52,96,112,163,222 'asset':132 'base':8,22,92,128 'base-network' 'behind':37,219 'broad':45 'call':12,26,140 'catalog':46 'challeng':120,205 'classif':60 'commit':103 'connect':172 'content':178 'convers':77 'data':54 'decim':135 'descript':189 'determin':215 'difficult':213 'doc':162 'document':157,210 'embed':61 'endpoint':30,80,107,194,198 'equal':137 'estim':71 'exact':147 'exampl':186 'exchang':66 'extrem':159 'feed':65 'financ':62 'function':218 'gas':70 'gate':3,17 'generat':78 'geocod':75 'host':43 'infrastructur':73 'key':97 'label':110,224 'lack':208 'limit':100 'live':200 'lowpaymentfee' 'lowpaymentfee.com':32 'made':143 'make':211 'maximum':123 'micropayment api' 'network':93 'no-api-key' 'openapi':182 'page':167 'paid':9,23 'particular':193 'pay':49 'pay-per-call api' 'pay-per-request':48 'payment':141 'paywal':40 'per':11,25,50,85,139 'per-cal':10,24 'post':116 'post-method' 'premium':4,18,34,111,221 'premium api' 'price':64,82,164 'prompt':174 'provid':33 'quot':69 'rate':67,99 'readm':166 'render':169 'request':51,86,117 'request/response':185 'requir':104 'return':196,201 'schema':183 'scheme':148 'second':155 'sentiment':57 'settl':87 'site':42 'span':53 'spars':160 'specif':106 'summar':59 'timeout':156 'token':68 'unit':129 'usdc':14,28,89,131 'usdc-settlement' 'util':74 'valid':76,203 'via':144 'wallet':173 'web3':63 'x402':2,16,39,119,146 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"21b7d467-d538-400b-8a4c-7e44a5ca2dce","listingId":"941e6bbb-55c7-4649-bc37-d4c6cbdf75a2","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/charges/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:36.109Z"}],"sources":[{"listingId":"941e6bbb-55c7-4649-bc37-d4c6cbdf75a2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:36.109Z","lastSeenAt":"2026-04-22T21:31:26.468Z"}],"details":{"listingId":"941e6bbb-55c7-4649-bc37-d4c6cbdf75a2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/62 \\\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 site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/62"}],"useCases":["Accessing paid API services without traditional API key registration","Making one-off API calls settled instantly in USDC on Base","Agent-driven programmatic access to gated endpoints via x402 protocol"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:54.985Z"},"updatedAt":"2026-04-22T21:31:26.468Z"}}