{"id":"b7ff268a-1214-4cff-92bb-f4ab85f09f38","shortId":"HKVMbm","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set 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, payable 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/messages/193` is described as \"Premium API Access\" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payments are sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the \"exact\" payment scheme with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The purpose of the `/api/v1/messages/193` path specifically (as opposed to the other listed endpoints) is unclear; it does not appear in the site's own catalog of available APIs.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api","crypto api gateway"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The endpoint path /api/v1/messages/193 does not appear in the provider's own listed API catalog; its specific function is unclear","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no technical content","No usage examples, error codes, or rate limit information documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/193","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/193","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), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page catalog, and the specific /api/v1/messages/193 path is not listed among the site's own advertised endpoints. The purpose and expected input/output of this particular endpoint are 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'/api/v1/messages/193':122,225 '/pricing':187 '/readme':189 '/request':19,38 '0.02':18,37,94,145 '000':140 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '20':139 '300':167 '402 payment api' '6':150 'accept':172 'access':128 'across':54 'addit':200 'address':156 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,109,127,249 'appear':240 'application/json':177 'avail':216,248 'base':8,27,102,141,159 'base network api' 'beyond':179 'broad':50 'call':4,23 'catalog':246 'categori':56 'challeng':134 'classif':70 'commit':117 'connect':195 'convers':87 'cover':10,29 'crawl':219 'crypto api gateway' 'crypto-quotes' 'data':11,30,57 'data-analytics' 'decim':151 'describ':124 'detail':202 'document':178,211 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,120,171,234 'estim':81 'exact':162 'exampl':215 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'gas':80 'generat':88 'geocod':85 'geocoding' 'http':173 'infrastructur':83 'insight':62 'key':110 'land':181 'learn':65 'limit':113 'list':233 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'marketplac':46 'materi':220 'maxamountrequir':137 'metric':59 'micropayment api' 'network':103 'openapi':206 'oppos':229 'page':182,190 'path':226 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':97 'payment':152,163 'per':3,22,95 'platform':6,25 'post':174 'premium':126 'price':74,92 'prompt':197 'protocol':107 'purpos':222 'quot':79 'rate':77,112 'report':60 'request':96 'request/response':209 'resolv':192 'return':130,176 'schema':210 'scheme':164 'second':168 'sent':154 'sentiment':66 'sentiment-analysis' 'set':51 'sinc':147 'site':243 'spars':184 'spec':207 'specif':119,227 'standard':132 'summar':69 'technic':201 'text':68 'text-classification' 'text-summarization' 'timeout':169 'token':78 'unclear':236 'unit':142 'upfront':116 'usag':214 'usd':146 'usdc':9,28,99,144,148 'usdc api' 'usdc-base' 'use':149,160 'util':15,34,84 'utility-apis' 'valid':86 'via':104 'wallet':196 'web3':73 'x402':43,106,133 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2c2a931f-646c-4b02-8228-07a00a1616f0","listingId":"b7ff268a-1214-4cff-92bb-f4ab85f09f38","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.805Z"}],"sources":[{"listingId":"b7ff268a-1214-4cff-92bb-f4ab85f09f38","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/193","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.805Z","lastSeenAt":"2026-04-22T02:32:07.803Z"}],"details":{"listingId":"b7ff268a-1214-4cff-92bb-f4ab85f09f38","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/193 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/193","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/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/193"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC micropayments","Running AI inference tasks (sentiment, summarization, classification, embeddings) without API key management","Accessing utility services (geocoding, validation, conversion) on a pay-as-you-go basis","Building agent workflows that autonomously purchase API calls via x402 on Base"],"bestFor":["Developers wanting zero-signup, pay-per-use API access settled in USDC on Base","AI agents that need to autonomously purchase API calls without pre-provisioned keys","Prototyping and low-volume usage where $0.02/request with no minimums is cost-effective"],"notFor":["High-volume production workloads where per-request crypto settlement adds latency and cost overhead","Users who need detailed SLAs, rate-limit guarantees, or enterprise support","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.419Z"},"updatedAt":"2026-04-22T02:32:07.803Z"}}