{"id":"3d915711-1ecf-4686-93df-3bb9db64beb0","shortId":"chAq3H","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad suite of 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 with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint at `/api/v1/charges/123` is listed as \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The endpoint accepts POST requests and returns application/json responses. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation beyond the landing page is sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind each endpoint is not described in detail, so the specific inputs and outputs remain unclear.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","data-export","analytics","no-api-key"],"categories":["ai","finance","data","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","low fee API","crypto-paid API","machine learning API","data analytics API"],"warnings":["No OpenAPI or schema documentation available — endpoint inputs and outputs are unknown","All doc pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/charges/123 is labeled 'Premium API Access' but is not listed among the advertised endpoints on the landing page — its purpose is unclear","No example requests or responses are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/123","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/charges/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schemas, no example payloads, and all documentation pages beyond the landing page are empty wallet-connect stubs. The actual functionality behind each endpoint is undocumented, making this effectively a stub 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'/api/v1/charges/123':120 '/docs':197 '/pricing':199 '/readme':201 '/request':19,38 '0.02':18,37,95,148 '000':137 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':183 '0x8335':142 '20':136 '2913':143 '300':186 '6':152 'Base network API' 'USDC micropayment API' 'accept':171 'access':126 'across':54 'actual':230 'addit':212 'address':181 'ai':12,31,64 'analysi':68 'analyt':58 'analytics' 'api':5,24,45,107,125 'application/json':176 'avail':228 'base':8,27,103,138,145 'behind':232 'beyond':190 'broad':50 'call':4,23 'categori':56 'challeng':132 'classif':71 'commit':115 'connect':207 'convers':88 'crypto-paid API' 'data':11,30,57,61 'data analytics API' 'data-export' 'decim':153 'describ':237 'detail':214,239 'document':189,223 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,118,170,234 'equal':147 'estim':82 'exact':160 'exampl':226 'exchang':77 'exchange-rates' 'export':62 'feed':76 'financ':13,32,73 'four':55 'function':231 'gas':81 'gas-estimates' 'generat':89 'geocod':86 'geocoding' 'given':149 'header':168 'includ':163 'infrastructur':84 'input':243 'insight':63 'key':108 'land':192 'learn':66 'limit':111 'list':122 'low fee API' 'lowpaymentfee.com':39 'machin':65 'machine learning API' 'made':156 'metric':59 'minimum':114 'network':104 'no-api-key' 'offer':48 'openapi':218 'output':245 'page':193,202 'paid':98 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payload':227 'payment':154,167,179 'per':3,22,96 'platform':6,25,46 'post':172 'premium':124 'price':75,93 'price-feeds' 'prompt':209 'quot':80 'rate':78,110 'recipi':180 'remain':246 'render':204 'report':60 'request':97,133,173 'request/response':221 'respons':177 'return':128,175 'schema':222 'scheme':161 'second':187 'sentiment':67 'sentiment-analysis' 'spars':195 'spec':219 'specif':117,242 'suit':51 'summar':70 'technic':213 'text':69 'text-classification' 'text-summarization' 'timeout':188 'token':79 'unclear':247 'unit':139 'usdc':100,141,150 'usdc-base' 'util':15,34,85 'valid':87,130 'via':9,28,157 'wallet':208 'web3':74 'x':166 'x-payment':165 'x402':10,29,43,131,159 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"fce33edf-2920-457a-b3a6-ba7aa3b0de8b","listingId":"3d915711-1ecf-4686-93df-3bb9db64beb0","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/charges/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:14.588Z"}],"sources":[{"listingId":"3d915711-1ecf-4686-93df-3bb9db64beb0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/123","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:14.588Z","lastSeenAt":"2026-04-22T18:31:26.108Z"}],"details":{"listingId":"3d915711-1ecf-4686-93df-3bb9db64beb0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/123 \\\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":"All endpoints priced at $0.02/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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/123"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval and analytics without managing API keys","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto prices, gas estimates, and exchange rates via micropayments","Geocoding and data conversion utilities with no subscription commitment","Programmatic data export with pay-as-you-go pricing"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse utility endpoints","Developers who want to avoid API key management and subscription overhead","Low-volume or bursty workloads where $0.02/request flat pricing is economical"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-compatible USDC wallet for x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.988Z"},"updatedAt":"2026-04-22T18:31:26.108Z"}}