{"id":"755bd559-4dcf-4a00-86e0-01b4d1db3325","shortId":"zjVHQa","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/orders/29` 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. The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, all at the same $0.02 price point.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 exact functionality behind the `/api/v1/orders/29` endpoint is unclear; the description \"Premium API Access\" is generic and does not specify what data or service it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/orders/29 has a generic 'Premium API Access' description with no detail on what it actually returns","Cannot verify that the advertised AI, finance, and utility endpoints are functional — only /api/v1/orders/29 was probed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/29","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/29","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, confirming pricing and network. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and the purpose of the specific /orders/29 endpoint is unclear. The listing is effectively a stub with confirmed 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'/api/v1/orders/29':94,195 '/call':13,28 '/docs':156 '/pricing':157 '/readme':160 '0.02':12,27,62,121,148 '000':110 '0x8335':115 '20':109 '2913':116 '402':104 '402 payment api' 'access':100,203 'account':74 'across':45 'addit':125 'advertis':124 'ai-inference' 'ai/ml':48 'analysi':129 'analyt':47 'api':5,20,37,72,99,202 'attach':82 'avail':186 'base':8,23,69,111,118 'base network api' 'base-network' 'behind':193 'caller':80 'challeng':105 'classif':132 'classification' 'connect':166 'content':172 'convers':140 'crawl':189 'data':46,142,211 'data-analytics' 'descript':200 'document':151,181 'embed':133 'embeddings' 'enabl':36 'endpoint':44,55,92,126,196 'equal':120 'exact':191 'exampl':185 'exchang':136 'export':143 'extrem':153 'feed':135 'finance-data' 'finance/web3':50 'function':192 'generic':205 'geocod':138 'geocoding' 'header':86 'infer':49 'infrastructur':52 'key':73 'limit':77 'list':96 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':176 'page':161 'pay':2,17,58 'pay per call api' 'pay-per-request':1,16,57 'payment':85 'per':3,18,59 'platform':6,21,38,123 'point':150 'premium':98,201 'price':134,149 'prompt':168 'rate':76,137 'render':163 'request':4,19,60,89,106 'request/response':179 'requir':79 'return':102,215 'schema':180 'sentiment':128 'sentiment-analysis' 'servic':213 'settl':64 'simpli':81 'spars':154 'spec':177 'specif':91 'specifi':209 'summar':131 'text':130 'text-summarization' 'unclear':198 'unit':112 'usag':184 'usdc':15,30,66,114 'usdc api' 'usdc-settlement' 'util':53 'valid':139 'varieti':42 'via':10,25 'wallet':167 'x402':11,26,35,84 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e6231aca-22c7-4a20-bf8f-d0cb3778b336","listingId":"755bd559-4dcf-4a00-86e0-01b4d1db3325","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:25.900Z"}],"sources":[{"listingId":"755bd559-4dcf-4a00-86e0-01b4d1db3325","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:25.900Z","lastSeenAt":"2026-04-23T20:31:59.098Z"}],"details":{"listingId":"755bd559-4dcf-4a00-86e0-01b4d1db3325","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/29 \\\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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/orders/29 requests maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/29"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments"],"bestFor":["Developers wanting instant API access without account creation or API keys","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or exploratory use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request pricing becomes expensive","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.73Z"},"updatedAt":"2026-04-23T20:31:59.098Z"}}