{"id":"a7ef9908-56b8-4ccb-bb14-76e62ac016f6","shortId":"JhhsQh","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, 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 & machine learning, finance & Web3, and 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 minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/9` is listed as \"Premium API Access.\" 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 endpoint accepts POST requests and returns `application/json`. The broader platform also exposes endpoints for 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 beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional technical detail. No OpenAPI spec, request/response schemas, or usage examples are published. Because of this, the exact input format and response structure for `/api/v1/messages/9` (and the other endpoints) must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-quotes","gas-estimates","geocoding","validation","conversion","generation"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","premium API access"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content","The specific purpose of /api/v1/messages/9 ('Premium API Access') is not documented; it is unclear what 'messages' refers to","No SLA, rate-limit, or uptime guarantees are published"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/9","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/9","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page, and no examples. The purpose of the specific /messages/9 path is unclear. Effectively a stub 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'/api/v1/messages/9':104,224 '/pricing':187 '/readme':189 '/request':18,36 '0.02':17,35,68,131,175 '000':120 '0x8335':125 '20':119 '2913':126 '6':135 'Base network API' 'USDC API' 'accept':139 'access':110 'addit':200 'advertis':114 'ai':12,30,55 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'also':148 'analysi':153 'analyt':54 'api':5,23,43,81,109 'application/json':144 'attach':92 'base':8,26,76,121,128 'beyond':179 'broad':48 'broader':146 'call':4,22 'caller':90 'challeng':113 'classif':156 'collect':49 'commit':89 'connect':195 'convers':168 'conversion' 'cost':117 'cover':10,28 'crypto-quotes' 'data':11,29,53 'data-analytics' 'decim':136 'detail':202 'discov':231 'document':178 'embed':157 'enabl':42 'endpoint':51,64,102,138,150,228 'equal':130 'estim':165 'everi':63 'exact':217 'exampl':210 'exchang':160 'exchange-rates' 'experiment':232 'expos':149 'feed':159 'financ':13,31,58 'finance-prices' 'format':219 'gas':164 'gas-estimates' 'generat':170 'generation' 'geocod':166 'geocoding' 'given':132 'header':96 'infrastructur':61 'input':218 'key':82 'land':181 'learn':57 'limit':85 'list':106 'low payment fee' 'lowpaymentfee.com':37 'machin':56 'maximum':116 'micropayment API' 'minimum':88 'must':229 'network':77 'offer':46 'openapi':204 'page':182,190 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':95 'per':3,21,69 'platform':44,147 'point':177 'post':140 'premium':108 'premium API access' 'price':66,158,176 'prompt':197 'publish':212 'quot':163 'rate':84,161 'request':70,99,141 'request/response':206 'resolv':192 'respons':221 'return':143 'schema':207 'sentiment':152 'settl':71 'simpli':91 'span':52 'spars':184 'spec':205 'specif':101 'structur':222 'suit':6,24 'summar':155 'technic':201 'text':154 'token':162 'unit':122 'usag':209 'usdc':9,27,73,124,133 'usdc-base' 'util':15,33,62 'valid':167 'validation' 'wallet':196 'web3':59 'x402':41,94,112 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"495dd6b8-60d3-4a40-b1a7-16e62953b1c7","listingId":"a7ef9908-56b8-4ccb-bb14-76e62ac016f6","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.406Z"}],"sources":[{"listingId":"a7ef9908-56b8-4ccb-bb14-76e62ac016f6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.406Z","lastSeenAt":"2026-04-22T02:32:08.508Z"}],"details":{"listingId":"a7ef9908-56b8-4ccb-bb14-76e62ac016f6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/9 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/9"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) on a per-call basis without API key management","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) with instant USDC micropayments","Accessing utility services like geocoding, validation, and data conversion without subscriptions"],"bestFor":["Agents or bots that need frictionless, key-less API access paid per call","Developers prototyping with multiple API categories under a single payment model","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.57Z"},"updatedAt":"2026-04-22T02:32:08.508Z"}}