{"id":"57820d6f-f200-4804-9e78-7268e08bfcd8","shortId":"KDKNzK","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The probed endpoint (`/api/v1/orders/44`) is described as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call, settled to a Base address.\n\nThe provider's landing page advertises four categories of APIs: 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 crawl. The specific endpoint `/api/v1/orders/44` does not appear in the landing page's listed APIs, so its exact functionality beyond the generic \"Premium API Access\" label is unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet'","No OpenAPI or schema specification found","The probed endpoint /api/v1/orders/44 is not listed among the provider's advertised API endpoints; its specific function is unknown","No request or response examples available to verify actual functionality","Cannot confirm that any of the advertised endpoints (AI, finance, data, etc.) are actually functional beyond the landing page listing"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/44","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/orders/44","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 402 challenge with clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, no examples, and the specific endpoint /api/v1/orders/44 is not listed among the advertised APIs, making its purpose 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'/api/v1/orders/44':64,201 '/docs':163 '/pricing':165 '/readme':167 '/request':17,34 '0.02':16,33,86,143 '000':81 '20':80 '402':75 '402 payment api' 'access':45,70,221 'address':94 'advertis':100 'ai':10,27,112 'ai-inference' 'analysi':116 'analyt':106 'api':4,21,41,69,104,148,211,220 'appear':204 'avail':194 'base':7,24,59,82,93 'base usdc api' 'base-network' 'behind':51 'beyond':216 'call':89 'categori':102 'challeng':76 'classif':119 'classification' 'commit':156 'connect':173 'convers':136 'crawl':197 'data':9,26,105,109 'data-analytics' 'describ':66 'detail':180 'document':158,189 'embed':120 'embeddings' 'endpoint':14,31,50,63,139,200 'estim':130 'exact':214 'exampl':193 'exchang':125 'export':110 'extrem':160 'feed':124 'financ':11,28,121 'finance-data' 'four':101 'function':215 'gas':129 'gate':3,20,44 'generat':137 'generic':218 'geocod':134 'geocoding' 'infrastructur':132 'insight':111 'key':149 'label':222 'land':98,207 'learn':114 'limit':152 'list':141,210 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':113 'marketplac':42 'metric':107 'micropay':56 'micropayment api' 'minimum':155 'network':60 'no-api-key' 'offer':8,25 'openapi':184 'page':99,168,208 'pay-per-request api' 'per':53,88,144 'per-request':52 'per-request-billing' 'platform':5,22 'premium':68,219 'price':123 'probe':62 'prompt':175 'protocol':40 'provid':96 'quot':128 'rate':126,151 'render':170 'report':108 'request':54,77,145 'request/response':187 'requir':157 'return':72 'schema':188 'sentiment':115 'sentiment-analysis' 'settl':90 'spars':161 'spec':185 'specif':199 'summar':118 'technic':179 'text':117 'text-summarization' 'token':127 'unclear':224 'unit':83 'usag':192 'usd':87 'usdc':55,85 'usdc-micropayment' 'util':13,30,133 'utility-apis' 'valid':74,135 'varieti':48 'wallet':174 'web3':122 'x402':2,19,39 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"5341128d-444e-4f24-adb0-31493c835fc5","listingId":"57820d6f-f200-4804-9e78-7268e08bfcd8","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/orders/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:11.839Z"}],"sources":[{"listingId":"57820d6f-f200-4804-9e78-7268e08bfcd8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:11.839Z","lastSeenAt":"2026-04-23T16:30:38.901Z"}],"details":{"listingId":"57820d6f-f200-4804-9e78-7268e08bfcd8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/44 \\\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":"The landing page lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/44"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running data analytics queries and exporting reports on a pay-per-use basis","Geocoding and data validation as utility microservices"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Prototyping and low-volume use cases where $0.02/request is cost-effective","x402-compatible wallets and agent frameworks on the Base network"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Developers not set up for USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.589Z"},"updatedAt":"2026-04-23T16:30:38.901Z"}}