{"id":"aa969729-ebd2-4e2d-bedb-62fc7b133e15","shortId":"QuFVKm","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 exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/159` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via an `X-PAYMENT` header using the x402 exact scheme. No API keys or rate limits are advertised; access is instant once payment is included in the request.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README routes all return only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The purpose of the `/api/v1/messages/159` endpoint specifically is unclear; it may be a generic message retrieval or content endpoint, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","lowpaymentfee","low payment fee","crypto API payments"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/159 is undocumented — 'Premium API Access' is a generic label","All documentation pages (/api, /pricing, /README) return only 'Connect wallet' with no content","No example responses or error codes are documented anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/159","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/159","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation for the specific /messages/159 endpoint, and the crawled pages beyond the landing are empty. The purpose and expected input/output of this endpoint are 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'/api/v1/messages/159':112,221 '/pricing':184 '/readme':186 '/request':19,38 '0.02':18,37,94,137 '000':127 '0x8335':132 '20':126 '6':141 'Base network API' 'USDC API' 'access':118,165 'across':54 'advertis':122,164 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,117,158 'avail':213,242 'base':8,27,102,128,134 'base-network' 'beyond':176 'broad':50 'call':4,23 'cannot':238 'catalog':51 'categori':56 'challeng':121 'classif':70 'classification' 'confirm':240 'connect':192 'content':234 'convers':87 'crawl':216 'crypto API payments' 'data':11,30,57 'data-analytics' 'decim':142 'detail':199 'document':175,208 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,110,222,235 'equal':136 'estim':81 'exact':155 'exampl':212 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'gas':80 'generat':88 'generic':230 'geocod':85 'geocoding' 'given':138 'header':151 'includ':171 'infrastructur':83 'insight':62 'instant':167 'key':159 'land':178 'learn':65 'limit':162 'list':114 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':145 'materi':243 'maxamountrequir':124 'may':227 'messag':231 'metric':59 'micropayment API' 'network':103 'no-api-key' 'offer':10,29 'openapi':203 'page':179 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payment':143,150,169 'per':3,22,95 'per-request-billing' 'platform':6,25,46 'premium':116 'price':74,92 'prompt':194 'protocol':107 'purpos':218 'quot':79 'rate':77,161 'report':60 'request':96,174 'request/response':206 'retriev':232 'return':189 'rout':187 'schema':207 'scheme':156 'sentiment':66 'sentiment-analysis' 'settl':97 'spars':181 'spec':204 'specif':109,223 'summar':69 'technic':198 'text':68 'text-summarization' 'token':78 'unclear':225 'unit':129 'usag':211 'usdc':9,28,99,131,139 'usdc-settlement' 'use':152 'util':15,34,84 'valid':86 'via':104,146 'wallet':193 'web3':73 'x':149 'x-payment':148 'x402':43,106,120,154 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"071c1809-c36e-4b04-add2-1de95454adce","listingId":"aa969729-ebd2-4e2d-bedb-62fc7b133e15","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/159","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.428Z"}],"sources":[{"listingId":"aa969729-ebd2-4e2d-bedb-62fc7b133e15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/159","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.428Z","lastSeenAt":"2026-04-22T02:32:07.043Z"}],"details":{"listingId":"aa969729-ebd2-4e2d-bedb-62fc7b133e15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/159 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/159","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 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 /api/v1/messages/159 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/159"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting reports with pay-as-you-go pricing","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or applications that need low-friction, keyless API access paid per request","Developers who want to avoid subscription commitments for occasional API calls","Web3-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.087Z"},"updatedAt":"2026-04-22T02:32:07.043Z"}}