{"id":"1c7e43b9-1ce8-45fa-b61c-0494cc2d138a","shortId":"QafAfu","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/49` 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 payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.\n\nThe broader platform advertises additional endpoints including 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 per-call 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 with no substantive content.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","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","cheap API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/messages/49 has no description beyond 'Premium API Access' — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content","No example request or response payloads are available; callers must guess at the expected input format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/49","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the /api, /pricing, and /README pages are all empty (wallet-connect only). The specific purpose of /api/v1/messages/49 is entirely 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'/api/v1/messages/49':104 '/pricing':207 '/readme':209 '/request':18,36 '0.02':17,35,68,131,185 '000':120 '0x8335':125 '20':119 '2913':126 '300':144 '6':135 'Base network API' 'USDC API' 'accept':149 'access':110 'addit':159 'advertis':114,158 'ai':12,30,55 'ai-inference' 'analysi':163 'analyt':54 'api':5,23,43,81,109 'application/json':154 'attach':92 'base':8,26,76,121,128 'broad':48 'broader':156 'call':4,22,188 'caller':90 'challeng':113 'cheap API' 'classif':166 'classification' 'collect':49 'commit':89 'connect':215 'content':221 'convers':178 'cost':117 'cover':10,28 'crawl':204 'crypto-quotes' 'data':11,29,53 'data-analytics' 'decim':136 'detail':195 'document':196 'embed':167 'embeddings' 'enabl':42 'endpoint':51,64,102,148,160 'equal':130 'estim':175 'everi':63 'exact':141 'exampl':198 'exchang':170 'feed':169 'financ':13,31,58 'finance-data' 'found':202 'gas':174 'generat':180 'geocod':176 'geocoding' 'given':132 'header':96 'howev':191 'http':150 'includ':161 'infrastructur':61 'key':82 'learn':57 'limit':85 'list':106 'low payment fee' 'lowpaymentfee.com':37 'machin':56 'maximum':116 'micropayment API' 'minimum':88 'network':77 'offer':46 'openapi':193 'page':210 'pay':2,20 'pay per call API' 'pay-per-cal':1,19 'pay-per-request' 'payload':200 'payment':95,138 'per':3,21,69,187 'per-cal':186 'platform':44,157 'point':190 'post':151 'premium':108 'price':66,168,189 'prompt':217 'quot':173 'rate':84,171 'request':70,99 'request/response':199 'return':153,212 'schema':194 'scheme':139 'second':145 'sentiment':162 'sentiment-analysis' 'settl':71 'simpli':91 'span':52 'specif':101 'substant':220 'suit':6,24 'summar':165 'text':164 'text-summarization' 'timeout':146 'token':172 'unit':122 'usdc':9,27,73,124,133 'usdc-base' 'util':15,33,62 'utility-apis' 'valid':177 'wallet':216 'web3':59 'x402':41,94,112 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"9869ed27-37c6-4da4-b610-8aeec3cf92b7","listingId":"1c7e43b9-1ce8-45fa-b61c-0494cc2d138a","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.083Z"}],"sources":[{"listingId":"1c7e43b9-1ce8-45fa-b61c-0494cc2d138a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.083Z","lastSeenAt":"2026-04-22T02:32:08.152Z"}],"details":{"listingId":"1c7e43b9-1ce8-45fa-b61c-0494cc2d138a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/49 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/messages/49"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","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 data or generating analytics reports on a pay-as-you-go basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with minimal setup — no signup, no rate limits","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.952Z"},"updatedAt":"2026-04-22T02:32:08.152Z"}}