{"id":"ccae71ee-a57c-42cf-9d73-31b5da4a5cef","shortId":"3Xhe3e","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using the x402 protocol, settling payments in USDC on the Base network. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/inbox/92` is listed as \"Premium API Access\" and requires up to 20,000 base units of USDC (i.e., $0.02) per call. The platform's landing page advertises a uniform $0.02 per request across all endpoints. Categories of available APIs include: metrics and reports (Data & Analytics), sentiment analysis, text summarization, classification, and embeddings (AI & ML), price feeds, exchange rates, token quotes, and gas estimates (Finance & Web3), and geocoding, validation, conversion, and generation utilities (Infrastructure).\n\nThe probe confirmed the endpoint is live, returning a proper 402 challenge with x402 version 1. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). No OpenAPI schema, detailed documentation, or example request/response payloads were found in the crawl, so the exact input parameters and response format for this particular endpoint remain unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","utility"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","no-api-key endpoint","on-demand inference"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and input/output format of /api/v1/inbox/92 is unknown — 'Premium API Access' is a generic label","No detailed docs, README, or API reference pages were accessible (all returned only 'Connect wallet')","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/92","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/inbox/92","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 402 challenge, but there is no OpenAPI schema, no documentation beyond the landing page listing, and no example request/response payloads. The specific purpose of /api/v1/inbox/92 ('Premium API Access') is entirely opaque — it could be any of the advertised services or something else. Pricing is clear but functionality is 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'/request':19,38 '0.02':18,37,128,139 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':205 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':212 '1':198 '20':121 '402':193 'access':116 'across':142 'address':204 'advertis':136 'ai':12,31,162 'ai-inference' 'ai/ml':57 'analysi':156 'analyt':56,154 'api':5,24,45,87,115,148 'attach':98 'avail':147 'base':8,27,82,123,211 'base network api' 'broad':50 'call':4,23,130 'caller':96 'categori':145 'challeng':194 'classif':159 'collect':51 'commit':95 'confirm':185 'contract':209 'convers':178 'conversion' 'crawl':226 'crypto-quotes' 'data':11,30,55,60,153 'data-analytics' 'detail':216 'direct':202 'document':217 'embed':161 'embeddings' 'enabl':44 'endpoint':16,35,53,66,108,144,187,238 'estim':172 'exact':229 'exampl':219 'exchang':166 'feed':165 'financ':13,32,173 'finance-data' 'finance/web3':59 'format':234 'found':223 'gas':171 'gas-estimates' 'general':62 'generat':180 'geocod':176 'geocoding' 'header':102 'i.e':127 'includ':149 'infer':58 'infrastructur':182 'input':230 'key':88 'land':134 'limit':91 'list':112 'live':189 'low payment fee' 'lowpaymentfee.com':39 'metric':150 'micropayment api' 'ml':163 'network':83 'no-api-key endpoint' 'offer':10,29 'on-demand inference' 'openapi':214 'page':135 'paramet':231 'particular':237 'pay':2,21,69 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':68 'payload':221 'payment':77,101,200 'per':3,22,70,129,140 'platform':6,25,46,132 'premium':114 'price':164 'probe':184 'proper':192 'protocol':75 'provid':48 'quot':169 'rate':90,167 'remain':239 'report':152 'request':71,105,141 'request/response':220 'requir':118 'respons':233 'return':190 'schema':215 'sentiment':155 'sentiment-analysis' 'servic':64 'settl':76 'simpli':97 'span':54 'specif':107 'subscript':94 'summar':158 'text':157 'text-classification' 'text-summarization' 'token':168 'uniform':138 'unit':124 'unknown':240 'usdc':9,28,79,126,208 'usdc api' 'usdc-base' 'use':72,206 'util':15,34,63,181 'valid':177 'validation' 'version':197 'web3':174 'x402':43,74,100,196 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"dfe86b38-e9f3-4c10-9c43-51efceae052f","listingId":"ccae71ee-a57c-42cf-9d73-31b5da4a5cef","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/inbox/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.336Z"}],"sources":[{"listingId":"ccae71ee-a57c-42cf-9d73-31b5da4a5cef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.336Z","lastSeenAt":"2026-04-22T15:03:00.746Z"}],"details":{"listingId":"ccae71ee-a57c-42cf-9d73-31b5da4a5cef","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/92 \\\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":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns 402 with maxAmountRequired of 20000 base units USDC (=$0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/92"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/92"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes, gas estimates, or exchange rates via micropayment","Running geocoding, data validation, or format conversion as a utility service","Exporting analytics data or generating reports on a per-request payment basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility and AI endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that can settle USDC payments on Base L2"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up significantly","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, guaranteed uptime, or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.579Z"},"updatedAt":"2026-04-22T15:03:00.746Z"}}