{"id":"1a2ebdd0-0b7b-48b2-b19a-1a3c2a986db4","shortId":"Qkh2Tj","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, settled in USDC on the Base network. There are no API keys, no rate limits, and no sign-up — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/22` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment timeout is 300 seconds. The broader site advertises additional endpoint families: sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is minimal. The /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples beyond the endpoint listing on the homepage. The actual behavior and response format of `/api/v1/messages/22` is unknown from available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","ai-inference","data-analytics","finance-data","web3-data","utility-services"],"categories":["api-marketplace","llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI specification or request/response schema available","The specific endpoint /api/v1/messages/22 has no documented purpose beyond 'Premium API Access'","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","No usage examples or error format documentation found","The breadth of advertised endpoints (AI, analytics, finance, utilities) could not be independently verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/22","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/22","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 homepage listing, and the specific purpose of /api/v1/messages/22 is unexplained. The /api, /pricing, and /README pages are empty. This is effectively a stub 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'/api/v1/messages/22':105,228 '/pricing':186 '/readme':188 '/request':18,36 '0.02':17,35,68,136,178 '000':125 '0x8335':130 '20':124 '2913':131 '300':146 '402 payment api' '6':140 'accept':113 'access':111 'actual':222 'addit':152 'advertis':119,151 'ai':11,29 'ai-inference' 'ai/ml':55 'analysi':156 'analyt':12,30,54 'api':5,23,43,81,110 'attach':93 'avail':232 'base':8,26,76,126,133 'base network api' 'behavior':223 'beyond':214 'broad':48 'broader':149 'call':4,22 'caller':91 'challeng':118 'classif':159 'collect':49 'connect':194 'content':200 'convers':171 'cost':122 'cover':10,28 'data':53,58 'data-analytics' 'decim':141 'document':181,209 'embed':160 'enabl':42 'endpoint':51,64,103,153,216 'equal':135 'estim':168 'everi':63 'exampl':213 'exchang':163 'famili':154 'feed':162 'financ':13,31 'finance-data' 'finance/web3':57 'format':226 'gas':167 'general':60 'generat':173 'geocod':169 'given':137 'header':97 'homepag':220 'infer':56 'infrastructur':61 'key':82 'limit':85 'list':107,217 'low payment fee' 'lowpaymentfee.com':37 'materi':233 'maximum':121 'micropayment api' 'minim':183 'network':77 'no-api-key' 'offer':46 'openapi':204 'page':189 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':96,143 'per':3,21,69 'platform':44 'point':180 'post':114 'post-endpoint' 'premium':109 'price':66,161,179 'prompt':196 'quot':166 'rate':84,164 'request':70,100,115 'request/response':207 'resolv':191 'respons':225 'schema':208 'second':147 'sentiment':155 'settl':71 'sign':89 'sign-up':88 'simpli':92 'site':150 'span':52 'spec':205 'specif':102 'suit':6,24 'summar':158 'text':157 'timeout':144 'token':165 'unit':127 'unknown':230 'usag':212 'usdc':9,27,73,129,138 'usdc api' 'usdc-base' 'util':15,33,62 'utility-services' 'valid':170 'wallet':195 'web3-data' 'x402':41,95,117 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"40448b31-8cd2-4f2d-b7dc-ee3ee5ba2944","listingId":"1a2ebdd0-0b7b-48b2-b19a-1a3c2a986db4","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.756Z"}],"sources":[{"listingId":"1a2ebdd0-0b7b-48b2-b19a-1a3c2a986db4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.756Z","lastSeenAt":"2026-04-22T02:32:07.708Z"}],"details":{"listingId":"1a2ebdd0-0b7b-48b2-b19a-1a3c2a986db4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/22 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/22"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-initiated API calls that need zero-signup, pay-as-you-go access","Programmatic access to AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time finance and crypto data (prices, exchange rates, gas estimates) via micropayments","Utility operations like geocoding, validation, and data conversion on demand"],"bestFor":["AI agents that need frictionless, key-free API access via x402","Developers prototyping with many different API categories at low per-call cost","Web3-native applications already operating on the Base network"],"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","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.533Z"},"updatedAt":"2026-04-22T02:32:07.708Z"}}