{"id":"0884270e-a5c8-447a-a5ea-9ddd6f473300","shortId":"HQWXaD","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-enabled API endpoints spanning 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/generate/resource/20` is listed as \"Premium API Access\" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals). Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" payment scheme. The endpoint accepts HTTP POST requests and returns `application/json` responses.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind each endpoint is unclear; the names are suggestive but unverified. Agents should treat this as a low-documentation provider and test endpoints carefully before relying on them in production workflows.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","sentiment-analysis","text-summarization","text-classification","embeddings","geocoding","data-export","price-feeds","exchange-rates","gas-estimates","validation","conversion"],"categories":["llm","data","finance","geo","utility"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","no-auth api"],"warnings":["No OpenAPI or schema documentation available — all endpoint behavior is unverified","Docs, pricing, API, and README pages all render only 'Connect wallet' with no content","The specific functionality of /api/v1/generate/resource/20 ('Premium API Access') is not described anywhere","No response schema or example responses are documented for any endpoint","Provider is anonymous — no company name, contact info, or terms of service found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/20","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/20","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, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual functionality behind 'Premium API Access' and the broader endpoint suite is unverifiable from available 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'/api/v1/generate/resource/20':118 '/docs':178 '/pricing':179 '/readme':182 '/request':19,38 '0.02':18,37,90,142 '000':136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '20':135 '6':146 'accept':161 'access':124 'actual':211 'addit':193 'address':152 'agent':224 'ai':12,31,59 'analysi':63 'analyt':53 'api':5,24,47,105,123 'application/json':167 'avail':209 'base':8,27,98,137 'base network api' 'behind':213 'beyond':170 'call':4,23 'care':237 'categori':51 'challeng':130 'cheap api' 'classif':66 'collect':42 'commit':113 'connect':188 'convers':83 'conversion' 'cover':10,29 'data':11,30,52,56 'data-export' 'decim':147 'detail':195 'document':169,204,232 'embed':67 'embeddings' 'enabl':46 'endpoint':16,35,48,86,116,160,215,236 'estim':77 'exact':156 'exampl':208 'exchang':72 'exchange-rates' 'export':57 'extrem':175 'feed':71 'financ':13,32,68 'four':50 'function':212 'gas':76 'gas-estimates' 'generat':84 'geocod':81 'geocoding' 'given':143 'http':162 'i.e':141 'infrastructur':79 'insight':58 'key':106 'land':172 'learn':61 'limit':109 'list':120 'low':231 'low payment fee' 'low-document':230 'lowpaymentfee.com':39 'machin':60 'made':150 'maxamountrequir':133 'metric':54 'micropayment api' 'name':219 'network':99 'no-auth api' 'offer':40 'openapi':199 'page':173,183 'paid':93 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':148,157 'per':3,22,91 'post':163 'premium':122 'price':70,88 'price-feeds' 'product':243 'prompt':190 'protocol':103 'provid':233 'quot':75 'rate':73,108 'reli':239 'render':185 'report':55 'request':92,164 'request/response':202 'respons':168 'return':126,166 'schema':203 'scheme':158 'sentiment':62 'sentiment-analysis' 'span':49 'spec':200 'specif':115 'standard':128 'suggest':221 'suit':6,25 'summar':65 'technic':194 'test':235 'text':64 'text-classification' 'text-summarization' 'thin':176 'token':74 'treat':226 'unclear':217 'unit':138 'unverifi':223 'upfront':112 'usag':207 'usdc':9,28,95,140,144 'usdc api' 'usdc-base' 'use':154 'util':15,34,80 'valid':82 'validation' 'via':100 'wallet':189 'web3':69 'workflow':244 'x402':45,102,129 'x402 api' 'x402-enabled':44 'x402-payment'","prices":[{"id":"d4e8aac9-d919-45a5-acc5-b6204f73a4bd","listingId":"0884270e-a5c8-447a-a5ea-9ddd6f473300","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:45.238Z"}],"sources":[{"listingId":"0884270e-a5c8-447a-a5ea-9ddd6f473300","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:45.238Z","lastSeenAt":"2026-04-23T16:06:41.519Z"}],"details":{"listingId":"0884270e-a5c8-447a-a5ea-9ddd6f473300","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/20 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/generate/resource/20","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/20"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto gas estimates or token price quotes via micropayment","Geocoding addresses or validating data on a per-request payment basis","Generating embeddings for text classification or search pipelines","Exporting data or retrieving analytics metrics with no rate limits"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where subscription pricing is wasteful","Crypto-native applications already operating on the Base network"],"notFor":["High-volume production workloads requiring SLAs, documentation, or guaranteed uptime","Users without USDC on Base or unfamiliar with x402 payment flows","Applications needing well-documented request/response schemas for integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.001Z"},"updatedAt":"2026-04-23T16:06:41.519Z"}}