{"id":"740021ed-9840-47ab-b93a-60db626cba40","shortId":"Y6wsud","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/generate/resource/17` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four categories of endpoints: 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 are priced at $0.02 per request.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/generate/resource/17` (labeled \"Premium API Access\") is unclear — it does not obviously map to any of the named endpoints on the landing page. Without documentation or example responses, callers must discover the API's behavior experimentally.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-gateway","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated API","402 payment API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content","The specific endpoint /api/v1/generate/resource/17 ('Premium API Access') does not map to any named endpoint on the landing page — its actual functionality is unknown","No example requests or responses are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/17","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/17","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific resource/17 endpoint's purpose is undocumented. The docs, pricing, and README pages are all empty 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'/api/v1/generate/resource/17':61,205 '/docs':170 '/pricing':171 '/readme':174 '/request':16,32 '0.02':15,31,88,162 '000':80 '0x8335':85 '20':79 '402 payment API' '6':93 'Base network API' 'USDC micropayment API' 'accept':69 'access':67,209 'advertis':75,120 'ai':9,25,132 'ai-inference' 'analysi':136 'analyt':8,24,126 'api':4,20,42,66,96,208,236 'attach':105 'avail':200 'base':7,23,55,81 'base-network' 'behavior':238 'behind':204 'broader':118 'call':41 'caller':103,232 'categori':122 'challeng':74 'classif':139 'collect':36 'connect':180 'content':186 'convers':156 'crypto-gated API' 'data':125,129 'data-analytics' 'decim':94 'discov':234 'document':165,195,228 'embed':140 'endpoint':13,29,43,59,124,222 'equal':87 'estim':150 'exampl':198,230 'exchang':145 'experiment':239 'export':130 'extrem':167 'feed':144 'financ':10,26,141 'finance-data' 'four':121 'function':203 'gas':149 'gate':3,19,44 'generat':157 'geocod':154 'header':110 'infrastructur':152 'insight':131 'key':97 'label':206 'land':225 'learn':134 'limit':100 'list':63 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':133 'map':216 'maxamountrequir':77 'metric':127 'must':233 'name':221 'network':56 'no-api-key' 'obvious':215 'offer':34 'openapi':190 'page':175,226 'pay':39 'pay-per-cal':38 'pay-per-call API' 'pay-per-request' 'payload':199 'payment':50,109,115 'per':40,89,163 'platform':119 'post':70 'post-endpoint' 'premium':65,207 'price':143,160 'prompt':182 'proof':116 'protocol':48 'quot':148 'rate':99,146 'report':128 'request':71,90,164 'request/response':193 'requir':102 'respons':231 'return':177 'schema':194 'sentiment':135 'settl':49 'simpli':104 'spars':168 'spec':191 'specif':58,202 'substant':185 'suit':5,21 'summar':138 'text':137 'token':147 'unclear':211 'unit':82 'usdc':52,84,91 'usdc-settlement' 'use':92 'util':12,28,153 'utility-services' 'valid':113,155 'wallet':181 'web3':142 'without':227 'x':108 'x-payment':107 'x402':2,18,47,73,114 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"f8c23097-7bd8-4084-a04e-d9069a9cf837","listingId":"740021ed-9840-47ab-b93a-60db626cba40","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:08.352Z"}],"sources":[{"listingId":"740021ed-9840-47ab-b93a-60db626cba40","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:08.352Z","lastSeenAt":"2026-04-23T16:06:39.706Z"}],"details":{"listingId":"740021ed-9840-47ab-b93a-60db626cba40","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/17 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/17"},{"claim":"All endpoints are 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 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 all returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing analytics metrics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto prices, gas estimates, and exchange rates","Performing utility operations like geocoding, validation, and data conversion"],"bestFor":["Developers who want pay-per-use API access without API key management","Agents or bots that can settle x402 payments in USDC on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation and guaranteed SLAs before integrating","Consumers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.807Z"},"updatedAt":"2026-04-23T16:06:39.706Z"}}