{"id":"b79f8a06-c316-49e3-b69d-30aafc7ad979","shortId":"UjS5HZ","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The specific endpoint at `/api/v1/products/89` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals).\n\nThe platform advertises categories including 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 listed endpoints share the same $0.02 price point. Payment is settled on-chain via the x402 exact-payment scheme.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The specific functionality behind the `/api/v1/products/89` \"Premium API Access\" endpoint is unclear, as no input or output schema details are provided beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","no-subscription API"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /README pages return only 'Connect wallet'","The specific functionality of /api/v1/products/89 ('Premium API Access') is completely undocumented","No request body schema or response format is known — callers must experiment","The broad catalog of advertised endpoints (AI, finance, analytics, utils) cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/89","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/products/89","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 confirmed) 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 the specific purpose of /api/v1/products/89 is undocumented. Effectively a stub 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'/api/v1/products/89':84,224 '/docs':183 '/pricing':185 '/readme':187 '/request':13,28 '0.02':12,27,111,162 '000':100 '0x8335':105 '20':99 '2913':106 '402':94 '6':116 'Base network API' 'USDC micropayment API' 'access':90,227 'advertis':120 'ai':130 'ai-inference' 'ai/ml':49 'analysi':134 'analyt':48,124 'api':5,20,37,71,89,226 'avail':214 'base':8,23,67,101,108 'behind':222 'beyond':240 'broad':42 'call':4,19,113 'catalog':43 'categori':121 'chain':170 'challeng':95,243 'classif':137 'classification' 'connect':193 'content':218 'convers':154 'crawl':217 'crypto-paid API' 'data':47,52,123,127 'data-analytics' 'decim':117 'detail':200,237 'document':178,209 'embed':138 'embeddings' 'enabl':36 'endpoint':45,57,82,158,228 'equal':110 'estim':148 'exact':175 'exact-pay':174 'exampl':213 'exchang':143 'export':128 'extrem':180 'feed':142 'financ':139 'finance-data' 'finance/web3':51 'function':221 'gas':147 'generat':155 'geocod':152 'geocoding' 'includ':122 'infer':50 'infrastructur':150 'input':233 'insight':129 'key':72 'learn':132 'limit':75 'list':86,157 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':131 'metadata':244 'metric':125 'network':9,24,68 'no-api-key' 'no-subscription API' 'offer':40 'on-chain':168 'openapi':204 'output':235 'page':188 'paid':59 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'payment':165,176 'per':3,18,61,112 'per-request':60 'per-request-billing' 'platform':6,21,38,119 'point':164 'premium':88,225 'price':141,163 'prompt':195 'provid':239 'quot':146 'rate':74,144 'render':190 'report':126 'request':62,96 'request/response':207 'requir':79 'return':92 'schema':208,236 'scheme':177 'sentiment':133 'sentiment-analysis' 'servic':55 'settl':167 'share':159 'span':46 'spars':181 'spec':205 'specif':81,220 'subscript':78 'summar':136 'technic':199 'text':135 'text-summarization' 'token':145 'unclear':230 'unit':102 'usag':212 'usdc':15,30,64,104,114 'usdc-base-network' 'use':63,115 'util':54,151 'utility-services' 'valid':153 'via':10,25,171 'wallet':194 'web3':140 'x402':11,26,35,173,242 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"6aae6358-8bf6-43e6-aa02-3fae2b101c4e","listingId":"b79f8a06-c316-49e3-b69d-30aafc7ad979","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/products/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:38.491Z"}],"sources":[{"listingId":"b79f8a06-c316-49e3-b69d-30aafc7ad979","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:38.491Z","lastSeenAt":"2026-04-22T21:30:30.249Z"}],"details":{"listingId":"b79f8a06-c316-49e3-b69d-30aafc7ad979","quickStartSnippet":"# POST with x402 payment header (USDC on Base)\ncurl -X POST https://lowpaymentfee.com/api/v1/products/89 \\\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","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/89"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/89"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time financial data or crypto gas estimates with per-call USDC payment","Running data analytics queries or exporting data on a pay-as-you-go basis","Geocoding or data validation as a utility microservice"],"bestFor":["AI agents with Base-network USDC wallets needing low-friction API access","Developers who want pay-per-use pricing without subscriptions or rate limits","Prototyping and low-volume use cases where $0.02/call is cost-effective"],"notFor":["High-volume production workloads where per-call crypto payment overhead is impractical","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-network wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.141Z"},"updatedAt":"2026-04-22T21:30:30.249Z"}}