{"id":"5d2e139b-abc6-4ea6-a86a-c8f9b4024960","shortId":"6r8Wjq","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 is an x402-enabled API platform that exposes a broad set of endpoints across four 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 are pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/generate/resource/78` is listed as \"Premium API Access\" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to the specified payTo address. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what this specific resource returns or what POST body it expects.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-api"],"categories":["llm","data","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API","serverless API"],"warnings":["No OpenAPI or schema documentation available — all doc pages render only 'Connect wallet'","The purpose and expected input/output of /api/v1/generate/resource/78 is undocumented","No request or response examples are available anywhere in the crawled material","It is unclear whether the listed AI/analytics/finance endpoints are fully functional or placeholders"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/78","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page lists available endpoints with pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page, and no examples. The specific resource/78 endpoint's purpose is entirely undocumented. This is effectively a stub 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'/api/v1/generate/resource/78':109 '/docs':182 '/pricing':184 '/readme':186 '/request':16,32 '0.02':15,31,92,138 '000':127 '0x8335':132 '20':126 '2913':133 '402':217 '6':142 'Base network API' 'USDC API' 'access':115,164 'across':48 'address':155 'advertis':163 'ai':9,25,58 'ai-inference' 'analysi':62 'analyt':8,24,52 'api':4,20,39,114,157 'base':7,23,99,128,135 'base-network' 'bodi':234 'broad':44 'call':90 'captur':219 'categori':50 'challeng':121,218 'classif':65 'classification' 'confirm':215 'connect':192 'content':198 'convers':82 'crypto-paid API' 'data':51,55 'data-analytics' 'decim':143 'document':177,207,222 'embed':66 'embeddings' 'enabl':38 'endpoint':13,29,47,85,107,213 'equal':137 'estim':76 'exact':149 'exampl':211 'exchang':71 'expect':236 'export':56 'expos':42 'extrem':179 'feed':70 'financ':10,26,67 'finance-data' 'four':49 'gas':75 'gate':3,19 'generat':83 'geocod':80 'geocoding' 'given':139 'header':176 'includ':170 'infrastructur':78 'insight':57 'instant':166 'key':158 'learn':60 'limit':161 'list':111 'live':216 'low fee API' 'lowpaymentfee.com':33 'machin':59 'made':146 'maxamountrequir':124 'metric':53 'micropayment API' 'network':100 'openapi':202 'page':187 'pay':88 'pay-per-cal':87 'pay-per-call API' 'pay-per-request' 'payment':144,168,175 'payto':154 'per':89 'platform':40 'post':233 'premium':113 'price':69 'prompt':194 'protocol':104 'quot':74 'rate':72,160 'render':189 'report':54 'request/response':205 'resourc':229 'return':117,230 'schema':206 'scheme':150 'sentiment':61 'sentiment-analysis' 'serverless API' 'set':45 'settl':94 'spars':180 'spec':203 'specif':106,228 'specifi':153 'standard':119 'suit':5,21 'summar':64 'text':63 'text-summarization' 'token':73 'unclear':225 'unit':129 'usag':210 'usdc':96,131,140 'usdc-settlement' 'util':12,28,79 'utility-api' 'valid':81 'via':101,147 'wallet':193 'web3':68 'without':221 'x':174 'x-payment':173 'x402':2,18,37,103,120 'x402 API' 'x402-enabled':36 'x402-gated':1,17 'x402-payment'","prices":[{"id":"767eb175-565f-4832-b0eb-8222738e240c","listingId":"5d2e139b-abc6-4ea6-a86a-c8f9b4024960","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:19.718Z"}],"sources":[{"listingId":"5d2e139b-abc6-4ea6-a86a-c8f9b4024960","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:19.718Z","lastSeenAt":"2026-04-23T19:00:40.841Z"}],"details":{"listingId":"5d2e139b-abc6-4ea6-a86a-c8f9b4024960","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/78 \\\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":"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 x402 challenge for resource/78 specifies maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/78"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, or exchange rates with per-call payment","Running analytics queries or exporting data on a pay-as-you-go basis","Geocoding or data validation as a utility microservice"],"bestFor":["AI agents that need keyless, pay-per-use API access on Base","Developers wanting low-friction access to multiple utility endpoints without subscriptions","Web3-native applications that can settle payments in USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscription plans","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.135Z"},"updatedAt":"2026-04-23T19:00:40.841Z"}}