{"id":"e2be9809-c3d8-407e-9bc6-f4fd2fc47ae8","shortId":"CPZGR7","kind":"x402","title":"Pay-per-call API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: 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 priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/stripe/charges/65` is labeled \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.\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 documentation, and no examples of what this particular endpoint returns. The endpoint name (\"stripe/charges/65\") suggests it may relate to Stripe charge data or a proxy for Stripe payment operations, but this is speculative. Without documentation or sample responses, the actual functionality of this specific endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay per call API","USDC micropayment API","Base network API","lowpaymentfee","stripe charges API","crypto payment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found","The purpose of the specific endpoint '/api/v1/stripe/charges/65' is unclear and not documented","No request body schema or response examples available","The endpoint path references 'stripe/charges' which may imply Stripe integration but this is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/65","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/65","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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The actual functionality of this specific endpoint (/api/v1/stripe/charges/65) is 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'/api/v1/stripe/charges/65':113 '/docs':183 '/pricing':185 '/readme':187 '/request':19,38 '0.02':18,37,99,138 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x8335':135 '20':129 '6':142 'Base network API' 'USDC micropayment API' 'accept':155 'access':118,169 'across':58 'actual':247 'address':151 'advertis':168 'ai':12,31,68 'analysi':72 'analyt':11,30,62 'api':5,24,45,117,162 'application/json':160 'base':8,27,107,131 'broad':50 'call':4,23 'catalog':51 'categori':60 'chain':149 'challeng':124 'charg':228 'classif':75 'connect':193 'content':199 'convers':92 'crypto payment API' 'data':61,65,229 'decim':143 'document':178,208,242 'embed':76 'enabl':44 'endpoint':16,35,57,95,111,154,216,219,252 'equal':137 'estim':86 'exampl':211 'exchang':81 'export':66 'extrem':180 'feed':80 'financ':13,32,77 'four':59 'function':248 'gas':85 'gate':171 'generat':93 'geocod':90 'given':139 'header':177 'infrastructur':88 'insight':67 'json-response' 'key':163 'label':115 'learn':70 'limit':166 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'maxamountrequir':127 'may':224 'metric':63 'name':220 'network':108 'no-api-key' 'no-rate-limit' 'offer':48 'on-chain':147 'openapi':203 'oper':236 'page':188 'paid':102 'particular':215 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':144,176,235 'per':3,22,55,100 'platform':6,25,46 'post':156 'post-endpoint' 'premium':116 'price':79,97 'prompt':195 'proxi':232 'pure':172 'quot':84 'rate':82,165 'relat':225 'remain':253 'render':190 'report':64 'request':56,101,157 'request/response':206 'respons':245 'return':120,159,217 'sampl':244 'schema':207 'sentiment':71 'settl':146 'spars':181 'spec':204 'specif':110,251 'specul':240 'stripe':227,234 'stripe charges API' 'stripe/charges/65':221 'suggest':222 'summar':74 'text':73 'token':83 'unclear':254 'unit':132 'usdc':104,134,140 'usdc-base' 'util':15,34,89 'valid':91,122 'via':9,28 'wallet':194 'web3':78 'without':241 'x402':10,29,43,123,175 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"cf6a7b85-777d-4779-b60e-cfcc48a46b5c","listingId":"e2be9809-c3d8-407e-9bc6-f4fd2fc47ae8","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:38.525Z"}],"sources":[{"listingId":"e2be9809-c3d8-407e-9bc6-f4fd2fc47ae8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:38.525Z","lastSeenAt":"2026-04-23T23:02:58.065Z"}],"details":{"listingId":"e2be9809-c3d8-407e-9bc6-f4fd2fc47ae8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/65 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and 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 network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/65"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without subscription or API key management","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows requiring pay-per-use endpoints"],"bestFor":["Developers wanting zero-commitment pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native payment rails over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:54.853Z"},"updatedAt":"2026-04-23T23:02:58.065Z"}}