{"id":"910afe8e-ea05-40fe-9c92-d0c87ca146a7","shortId":"JhvhvF","kind":"x402","title":"x402-payable API suite on Base: AI, analytics, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API suite on Base: AI, analytics, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific resource at `/api/v1/generate/resource/191` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The maximum amount required is 20,000 base units of USDC (0.02 USD per request), consistent with the site's uniform $0.02/request pricing across all endpoints.\n\nThe broader platform advertises four endpoint 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 share the same $0.02 per-request pricing with no API keys, no rate limits, and no minimum commitments — payment is handled entirely through the x402 payment header.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, 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/generate/resource/191` path (labeled \"Premium API Access\") is unclear — it may correspond to the \"Generation\" utility endpoint or a distinct resource. Without documentation, the exact input parameters and output format cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific function of /api/v1/generate/resource/191 ('Premium API Access') is unclear and undocumented","No request or response examples available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/191","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/generate/resource/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, and the specific purpose of resource/191 is undocumented. All doc pages return only 'Connect wallet' with no 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'/api/v1/generate/resource/191':58,219 '/docs':178 '/pricing':179 '/readme':182 '/request':16,32,98 '0.02':15,31,87,97,148 '000':82 '20':81 'Base network API' 'USDC API' 'accept':66 'access':64,224 'across':100 'advertis':106 'ai':8,24,117 'amount':78 'analysi':121 'analyt':9,25,111 'api':4,20,45,63,155,223 'avail':209 'base':7,23,52,83 'base-network' 'behind':217 'broader':104 'call':44 'cannot':248 'categori':109 'classif':124 'collect':36 'commit':163 'confirm':250 'connect':188 'consist':91 'content':213 'convers':141 'correspond':229 'crawl':212 'data':110,114 'detail':195 'distinct':237 'document':173,204,240 'embed':125 'endpoint':13,29,46,102,108,144,234 'entir':167 'estim':135 'exact':74,242 'exampl':208 'exchang':130 'export':115 'extrem':175 'feed':129 'financ':10,26,126 'format':247 'four':107 'function':216 'gas':134 'generat':142,232 'geocod':139 'handl':166 'header':172 'host':34 'infrastructur':137 'input':243 'insight':116 'key':156 'label':221 'learn':119 'limit':159 'list':60 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':118 'maximum':77 'may':228 'metric':112 'micropayment API' 'minimum':162 'network':53 'no-api-key' 'openapi':199 'output':246 'page':183 'paramet':244 'path':220 'pay':42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payabl':3,19 'payment':70,164,171 'per':43,89,150 'per-request':149 'platform':105 'post':67 'post-endpoint' 'premium':62,222 'premium API access' 'price':99,128,152 'prompt':190 'protocol':40 'quot':133 'rate':131,158 'render':185 'report':113 'request':68,90,151 'request/response':202 'requir':79 'resourc':56,238 'schema':203 'scheme':75 'sentiment':120 'settl':47 'share':145 'site':94 'spars':176 'spec':200 'specif':55,215 'suit':5,21 'summar':123 'technic':194 'text':122 'token':132 'unclear':226 'uniform':96 'unit':84 'usag':207 'usd':88 'usdc':49,86 'usdc-settlement' 'util':12,28,138,233 'valid':140 'via':71 'wallet':189 'web3':127 'without':239 'x402':2,18,39,73,170 'x402 API' 'x402-payable':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"8d52ced1-2c6b-4b96-a350-42ddcfba8288","listingId":"910afe8e-ea05-40fe-9c92-d0c87ca146a7","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/generate/resource/191","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:40.894Z"}],"sources":[{"listingId":"910afe8e-ea05-40fe-9c92-d0c87ca146a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/191","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:40.894Z","lastSeenAt":"2026-04-23T00:31:13.868Z"}],"details":{"listingId":"910afe8e-ea05-40fe-9c92-d0c87ca146a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/191 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/191"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/191"}],"useCases":["Programmatic access to utility/generation endpoints without API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Integrating pay-per-request services into crypto-native applications"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Projects needing low-cost per-request pricing without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Non-crypto users without access to USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.023Z"},"updatedAt":"2026-04-23T00:31:13.868Z"}}