{"id":"acd8e094-f967-44b6-a339-e2ec61976d4d","shortId":"ZXnxsF","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/12` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints in 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 (geocoding, validation, conversion, generation). All share the same $0.02 pricing. No OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling — the docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","analytics-metrics","analytics-reports","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","data-export","json-api"],"categories":["llm","analytics","finance","infrastructure"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","cheap API calls","micro-payment endpoint","402 payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/messages/12 is undocumented — 'Premium API Access' is generic","Docs, pricing, and README pages return only a 'Connect wallet' prompt with no useful content","Example request JSON is inferred/guessed — no actual schema was provided","The breadth of advertised endpoints (AI, analytics, finance, utils) could not be independently verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/12","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/messages/12","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 network details. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific purpose of /api/v1/messages/12 is unclear. The crawled docs/pricing/README pages were all blank wallet-connect 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'/request':18,36 '0.02':17,35,68,129,202 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '20':123 '300':147 '402 payment API' '6':134 'Base network API' 'USDC micropayment API' 'accept':152 'access':114 'address':143 'advertis':161 'ai':11,29,173 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':177 'analyt':12,30,54,167 'analytics-metrics' 'analytics-reports' 'api':5,23,43,85,113 'application/json':157 'attach':96 'base':8,26,76,125,137 'broad':48 'broader':159 'call':4,22 'caller':94 'categori':165 'challeng':119 'cheap API calls' 'classif':180 'collect':49 'commit':93 'connect':228 'convers':196 'cover':10,28 'crawl':216 'crypto-gas-estimates' 'data':53,58,166,170 'data-export' 'decim':135 'detail':207 'doc':218 'document':208 'embed':181 'enabl':42 'endpoint':51,64,106,151,162 'estim':191 'everi':63 'exampl':210 'exchang':186 'exchange-rates' 'export':171 'feed':185 'financ':13,31,182 'finance-price-feeds' 'finance/web3':57 'found':214 'four':164 'gas':190 'general':60 'generat':197 'geocod':194 'geocoding' 'header':100 'infer':56 'infrastructur':61,193 'insight':172 'json-api' 'key':86 'learn':175 'limit':89 'list':110 'low payment fee API' 'lowpaymentfee.com':37 'machin':174 'metric':168 'micro-payment endpoint' 'minim':227 'minimum':92 'network':77 'offer':46 'openapi':205 'page':222 'paid':71 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payload':212 'payment':99,139 'per':3,21,69 'platform':44,160 'post':153 'premium':112 'price':66,184,203,219 'prompt':230 'protocol':81 'quot':189 'rate':88,187 'readm':221 'report':169 'request':70,103,120,154 'request/response':211 'resolv':224 'return':116,156 'schema':206 'second':148 'sentiment':176 'settl':141 'share':199 'simpli':95 'sinc':131 'span':52 'specif':105 'suit':6,24 'summar':179 'text':178 'timeout':149 'token':188 'unit':126 'usd':130 'usdc':9,27,73,128,132 'usdc-base' 'use':133 'util':15,33,62 'valid':195 'via':78 'wallet':229 'web3':183 'x402':41,80,98,118 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"add99d93-e5af-4478-9223-1885be059715","listingId":"acd8e094-f967-44b6-a339-e2ec61976d4d","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/messages/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.976Z"}],"sources":[{"listingId":"acd8e094-f967-44b6-a339-e2ec61976d4d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.976Z","lastSeenAt":"2026-04-22T10:03:02.500Z"}],"details":{"listingId":"acd8e094-f967-44b6-a339-e2ec61976d4d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/12 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"message\": \"Hello\"}'","exampleRequest":{"message":"Hello"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/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 (0.02 USD) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/messages/12"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/12"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes, gas estimates, or exchange rates on a per-call basis","Exporting data or generating analytics reports with instant pay-per-use billing","Geocoding addresses or validating data through lightweight utility endpoints","Integrating AI embeddings or classification into agent workflows via x402 payments"],"bestFor":["AI agents that need on-demand access to diverse API capabilities without pre-registration","Developers who want zero-commitment, pay-as-you-go API access settled in USDC on Base","Prototyping and low-volume use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request crypto payments add overhead","Users who need detailed API documentation, SLAs, or guaranteed uptime commitments","Callers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.8Z"},"updatedAt":"2026-04-22T10:03:02.500Z"}}