{"id":"3569caf5-af1c-4d71-96b0-be1bd5b77e53","shortId":"LDE5sA","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/19` 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 HTTP POST and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises sibling 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. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt. The exact functionality behind the `/messages/19` path is unclear from available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","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"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/19 ('Premium API Access') is not documented — it is unclear what this endpoint actually returns","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content","No example request or response payloads are available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/19","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/19","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, and the landing page confirms pricing and lists many sibling endpoints. However, there is no OpenAPI schema, no documentation, no example requests or responses, and the purpose of `/api/v1/messages/19` specifically is unexplained. The /api, /pricing, and /README pages are empty behind a wallet 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'/api/v1/messages/19':104 '/messages/19':220 '/pricing':204 '/readme':206 '/request':18,36 '0.02':17,35,68,131,185 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':125 '20':119 '2913':126 '300':152 '402 payment api' '6':135 'accept':139 'access':110 'advertis':114,158 'ai':12,30,55 'ai-inference' 'analysi':163 'analyt':54 'api':5,23,43,81,109 'application/json':144 'attach':92 'avail':225 'base':8,26,76,121,128 'base network api' 'behind':218 'broad':48 'broader':156 'call':4,22 'caller':90 'challeng':113 'classif':166 'classification' 'collect':49 'commit':89 'connect':212 'convers':178 'cost':117 'cover':10,28 'crawl':201 'crypto-quotes' 'data':11,29,53 'data-analytics' 'decim':136 'detail':192 'document':193 'embed':167 'embeddings' 'enabl':42 'endpoint':51,64,102,138,160 'equal':130 'estim':175 'everi':63 'exact':216 'exampl':195 'exchang':170 'feed':169 'financ':13,31,58 'finance-data' 'found':199 'function':217 'gas':174 'generat':180 'geocod':176 'geocoding' 'given':132 'header':96 'howev':188 'http':140 'infrastructur':61 'key':82 'learn':57 'limit':85 'list':106 'low payment fee' 'lowpaymentfee.com':37 'machin':56 'materi':226 'maximum':116 'micropayment api' 'minimum':88 'network':77 'offer':46 'openapi':190 'page':207 'path':221 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payload':197 'payment':95,145 'per':3,21,69 'platform':44,157 'point':187 'post':141 'premium':108 'price':66,168,186 'prompt':214 'quot':173 'rate':84,171 'request':70,99 'request/response':196 'return':143,209 'schema':191 'second':153 'sent':147 'sentiment':162 'sentiment-analysis' 'settl':71 'sibl':159 'simpli':91 'span':52 'specif':101 'suit':6,24 'summar':165 'text':164 'text-summarization' 'timeout':154 'token':172 'unclear':223 'unit':122 'usdc':9,27,73,124,133 'usdc api' 'usdc-base' 'util':15,33,62 'utility-apis' 'valid':177 'wallet':213 'web3':59 'x402':41,94,112 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"aa785970-263e-4272-bc7c-780a266e6f7e","listingId":"3569caf5-af1c-4d71-96b0-be1bd5b77e53","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.440Z"}],"sources":[{"listingId":"3569caf5-af1c-4d71-96b0-be1bd5b77e53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.440Z","lastSeenAt":"2026-04-22T05:32:16.396Z"}],"details":{"listingId":"3569caf5-af1c-4d71-96b0-be1bd5b77e53","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/19 \\\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/19"},{"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"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/19"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility microservice in automated pipelines","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that prefer keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads that need SLAs, rate-limit guarantees, or dedicated support","Users who need detailed API documentation or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.008Z"},"updatedAt":"2026-04-22T05:32:16.396Z"}}