{"id":"3f3d1e3e-db23-4635-9a72-a6636472e28f","shortId":"MhhPzD","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/charges/370` is labeled \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per request. No API keys or rate limits are advertised; 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 listed endpoints share the same $0.02/request pricing. However, the crawled documentation pages beyond the landing page returned only a \"Connect wallet\" stub, so there is no detailed schema, parameter documentation, or example responses available for any endpoint.\n\nBecause the `/api/v1/charges/370` path does not clearly map to any of the named endpoints on the landing page, its exact functionality is unknown. The x402 challenge confirms it is live, accepts POST requests, returns application/json, and charges up to $0.02 in USDC on Base. Without further documentation or example payloads, callers will need to experiment or contact the provider to understand the expected request body and response format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["api-gateway","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment required","lowpaymentfee"],"warnings":["The endpoint path /api/v1/charges/370 does not correspond to any named endpoint on the landing page; its actual functionality is unknown.","All documentation, pricing, API, and README pages return only a 'Connect wallet' stub with no usable content.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","The breadth of advertised capabilities (AI, finance, analytics, infra) cannot be verified from crawled content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/370","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/charges/370","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network, but the specific endpoint's purpose is unclear (generic 'Premium API Access' label at a /charges/370 path). Documentation pages are empty stubs ('Connect wallet' only), no OpenAPI schema or example payloads exist, and the endpoint's input/output contract is 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'/request':16,32,152 '0.02':15,31,79,151,223 '000':73 '20':72 '402 payment required' 'accept':214 'access':66 'advertis':89,107 'ai':9,25,119 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':123 'analyt':8,24,113 'api':4,20,42,65,83 'application/json':218 'attach':92 'avail':180 'base':7,23,55,74,227 'base usdc api' 'beyond':159 'bodi':248 'broader':105 'call':41 'caller':90,234 'categori':109 'challeng':209 'charg':220 'classif':126 'clear':190 'collect':36 'confirm':210 'connect':166 'contact':240 'convers':143 'conversion' 'crawl':156 'crypto-gas' 'data':112,116 'data-analytics' 'detail':173 'document':157,176,230 'embed':127 'endpoint':13,29,43,59,111,147,183,197 'estim':137 'exact':203 'exampl':178,232 'exchang':132 'exchange-rates' 'expect':246 'experi':238 'export':117 'feed':131 'financ':10,26,128 'finance-prices' 'format':251 'four':108 'function':204 'gas':136 'gate':3,19,44 'generat':144 'geocod':141 'geocoding' 'header':97 'howev':154 'i.e':78 'infrastructur':139 'insight':118 'key':84 'label':63 'land':161,200 'learn':121 'limit':87 'list':146 'live':213 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':120 'map':191 'maximum':70 'metric':114 'micropayment api' 'name':196 'need':236 'network':56 'offer':34 'page':158,162,201 'paramet':175 'path':187 'pay':39 'pay per call api' 'pay-per-cal':38 'pay-per-request' 'payload':233 'payment':50,96,102 'per':40,80 'platform':106 'post':215 'premium':64 'price':130,153 'proof':103 'protocol':48 'provid':242 'quot':135 'rate':86,133 'report':115 'request':81,216,247 'requir':68 'respons':179,250 'return':163,217 'schema':174 'sentiment':122 'settl':49 'share':148 'simpli':91 'specif':58 'stub':168 'suit':5,21 'summar':125 'text':124 'token':134 'understand':244 'unit':75 'unknown':206 'usdc':52,77,225 'usdc-base' 'util':12,28,140 'valid':100,142 'validation' 'wallet':167 'web3':129 'without':228 'x':95 'x-payment':94 'x402':2,18,47,101,208 'x402 api' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"06cdd9d0-187e-4fb1-858c-36070e177645","listingId":"3f3d1e3e-db23-4635-9a72-a6636472e28f","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/charges/370","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:25.970Z"}],"sources":[{"listingId":"3f3d1e3e-db23-4635-9a72-a6636472e28f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/370","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:25.970Z","lastSeenAt":"2026-04-22T16:31:17.715Z"}],"details":{"listingId":"3f3d1e3e-db23-4635-9a72-a6636472e28f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/370 \\\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 returns 402 with maxAmountRequired 20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/370"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto gas estimates or token price quotes with per-call billing","Running geocoding or data validation as a utility service paid in USDC on Base","Exporting analytics data or generating reports with no subscription commitment"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-per-use API access without signup","Web3-native applications that prefer on-chain micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume callers who would benefit from bulk pricing or subscription plans","Callers who cannot settle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.559Z"},"updatedAt":"2026-04-22T16:31:17.715Z"}}