{"id":"f4b6f7fd-c063-4943-acd4-00fd72675033","shortId":"2azpVt","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is a pay-per-call API platform that uses the x402 protocol to gate access to a broad set of endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general-purpose utilities. All endpoints settle payments on the Base network using USDC (contract 0x8335…2913). The specific endpoint listed here — `/api/v1/stripe/charges/154` — is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC has 6 decimals).\n\nThe platform advertises a uniform $0.02-per-request pricing model with no API keys, no rate limits, no minimums, and instant access. The site lists roughly 16 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).\n\nDocumentation is extremely thin — 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 usage examples available from the crawl. The endpoint path (`/api/v1/stripe/charges/154`) suggests it may relate to Stripe charge operations, but no further detail is available. Agents should expect to experiment with POST payloads to discover the actual input/output behavior.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-gateway","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI spec or schema documentation available","All doc/pricing/README pages render only 'Connect wallet' with no content","The endpoint path '/api/v1/stripe/charges/154' is unexplained — unclear what it actually does beyond 'Premium API Access'","No request or response examples available; input/output format is unknown","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/154","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/154","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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 landing page listing, and no examples. The specific endpoint path is opaque. Effectively a stub 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'/api/v1/stripe/charges/154':91,224 '/docs':187 '/pricing':189 '/readme':191 '/request':16,34 '0.02':15,33,112,123 '000':106 '0x8335':84 '16':145 '20':105 '2913':85 '402':100 '402 payment api' '6':116 'access':53,96,140 'across':147 'actual':250 'advertis':120 'agent':239 'ai':9,27,157 'ai-inference' 'ai/ml':63 'analysi':161 'analyt':8,26,62,151 'api':4,22,44,95,131 'avail':217,238 'base':7,25,79,107 'base network api' 'base-network' 'behavior':252 'broad':56 'call':43 'categori':149 'challeng':101 'charg':231 'classif':164 'classification' 'connect':197 'content':203 'contract':83 'convers':180 'crawl':220 'crypto-quotes' 'data':61,67,150,154 'data-analytics' 'decim':117 'detail':236 'discov':248 'document':182,212 'embed':165 'embeddings' 'endpoint':13,31,59,74,88,146,222 'estim':175 'exampl':216 'exchang':170 'expect':241 'experi':243 'export':155 'extrem':184 'feed':169 'financ':10,28,166 'finance-data' 'finance/crypto':65 'four':148 'gas':174 'gate':3,21,52 'general':70 'general-purpos':69 'generat':181 'geocod':178 'geocoding' 'i.e':111 'infer':64 'infrastructure/utilities':177 'input/output':251 'insight':156 'instant':139 'key':132 'label':93 'learn':159 'limit':135 'list':89,143 'low payment fee' 'lowpaymentfee.com':37 'machin':158 'market':66 'may':227 'metric':152 'micropayment api' 'minimum':137 'model':128 'network':80 'openapi':207 'oper':232 'page':192 'path':223 'pay':41 'pay per call api' 'pay-per-cal':40 'pay-per-request' 'payload':246 'payment':76 'per':42,125 'per-request':124 'platform':45,119 'post':245 'premium':94 'price':127,168 'prompt':199 'protocol':50 'purpos':71 'quot':173 'rate':134,171 'relat':228 'render':194 'report':153 'request':102,126 'request/response':210 'return':98 'rough':144 'schema':211 'sentiment':160 'sentiment-analysis' 'set':57 'settl':75 'sinc':113 'site':142 'span':60 'spec':208 'specif':87 'stripe':230 'suggest':225 'suit':5,23 'summar':163 'text':162 'text-summarization' 'thin':185 'token':172 'uniform':122 'unit':108 'usag':215 'usdc':18,36,82,110,114 'usdc api' 'usdc-settlement' 'use':47,81 'util':12,30,72 'utility-apis' 'valid':179 'via':17,35 'wallet':198 'web3':167 'x402':2,20,49 'x402 api' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"c8a3eccf-b629-44f1-8346-03f436e544c0","listingId":"f4b6f7fd-c063-4943-acd4-00fd72675033","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/154","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:10.739Z"}],"sources":[{"listingId":"f4b6f7fd-c063-4943-acd4-00fd72675033","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/154","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:10.739Z","lastSeenAt":"2026-04-22T15:01:53.201Z"}],"details":{"listingId":"f4b6f7fd-c063-4943-acd4-00fd72675033","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/154 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform $0.02/request pricing, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/154"},{"claim":"Site lists ~16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, or exchange rates on a pay-as-you-go basis","Running geocoding, validation, or data conversion tasks with no subscription commitment","Accessing analytics metrics and reports via automated agents using x402 payment headers"],"bestFor":["Agents or developers who want zero-signup, pay-per-request API access","Crypto-native workflows that can settle USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request costs add up quickly","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.22Z"},"updatedAt":"2026-04-22T15:01:53.201Z"}}