{"id":"3b7718c9-39d9-46eb-aef5-ce09d77cba19","shortId":"bUfN9e","kind":"x402","title":"x402-gated premium API access on Base, payable in USDC at $0.02 per request.","tagline":"x402-gated premium API access on Base, payable in USDC at $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning (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 Base with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/stripe/charges/86` is labeled \"Premium API Access\" in the x402 challenge. Its maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, 6 decimals), which equals $0.02. The endpoint accepts POST requests and returns application/json. The x402 challenge uses the \"exact\" scheme with a 300-second timeout. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\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 spec, no request/response schema, and no description of what this particular endpoint actually returns. The endpoint name (\"stripe/charges/86\") suggests it may relate to Stripe charge data or a proxy, but this is speculative. Without documentation or example payloads, the actual functionality of this specific route remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","finance"],"synonyms":["low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","402 payment required","crypto API gateway"],"warnings":["No OpenAPI or schema documentation available — actual request parameters and response format are unknown.","Docs, API, pricing, and README pages all render only 'Connect wallet' with no substantive content.","The endpoint path '/api/v1/stripe/charges/86' is ambiguous — its actual functionality is undocumented.","No examples or sample responses are available to verify endpoint behavior."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/86","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/86","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 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no clarity on what this specific endpoint actually does. Effectively a stub 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'0.02':13,28,92,138 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':133 '20000':127 '300':156 '402 payment required' '6':134 'Base network API' 'USDC pay-per-call' 'accept':141 'access':6,21,38,119 'actual':203,230 'address':163 'ai':62 'analysi':66 'analyt':61 'api':5,20,37,58,102,118,171 'application/json':146 'asset':132 'base':8,23,45,99,128 'base-network' 'behind':39 'broad':51 'call':57 'catalog':52 'challeng':123,149 'charg':215 'classif':68 'commit':109 'connect':180 'content':186 'convers':85 'crypto API gateway' 'data':60,216 'decim':135 'descript':197 'doc':170 'document':165,225 'embed':69 'endpoint':32,88,113,140,202,206 'equal':137 'estim':79 'exact':152 'exampl':227 'exchang':74 'extrem':167 'feed':73 'financ':70 'function':231 'gas':78 'gate':3,18 'generat':86 'geocod':83 'host':49 'infrastructur':81 'json-response' 'key':103 'label':116 'learn':64 'limit':106 'low payment fee API' 'lowpaymentfee.com':34 'machin':63 'maxamountrequir':125 'may':211 'micropayment API' 'name':207 'network':46 'no-api-key' 'openapi':190 'page':175 'particular':201 'pay':55 'pay-per-cal':54 'pay-per-request' 'payabl':9,24 'payload':228 'payment':159 'paywal':42 'per':14,29,56,93 'post':142 'post-method' 'premium':4,19,36,117 'price':72,90,172 'prompt':182 'provid':35 'proxi':219 'quot':77 'rate':75,105 'readm':174 'relat':212 'remain':236 'render':177 'request':15,30,94,143 'request/response':193 'requir':110 'return':145,204 'rout':235 'schema':194 'scheme':153 'second':157 'sent':161 'sentiment':65 'settl':95 'site':48 'span':59 'spars':168 'spec':191 'specif':112,234 'specul':223 'stripe':214 'stripe/charges/86':208 'suggest':209 'summar':67 'timeout':158 'token':76 'unclear':237 'unit':129 'usdc':11,26,97,131 'usdc-settlement' 'use':150 'util':82 'valid':84 'wallet':181 'web3':71 'without':224 'x402':2,17,41,122,148 'x402 API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"548d6025-34e5-46c6-86e0-09796330b0bf","listingId":"3b7718c9-39d9-46eb-aef5-ce09d77cba19","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/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:33.686Z"}],"sources":[{"listingId":"3b7718c9-39d9-46eb-aef5-ce09d77cba19","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:33.686Z","lastSeenAt":"2026-04-23T02:01:31.325Z"}],"details":{"listingId":"3b7718c9-39d9-46eb-aef5-ce09d77cba19","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/86 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/86"},{"claim":"Site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API endpoints without traditional API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Accessing data, AI, finance, or utility APIs with per-request micropayments"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","Crypto-native applications that can settle USDC on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Non-crypto users without a Base-compatible wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.093Z"},"updatedAt":"2026-04-23T02:01:31.325Z"}}