{"id":"8ba2b60d-7b4c-4af7-b28f-cfb4afdfa0fd","shortId":"q9NaLJ","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/58` is listed as \"Premium API Access\" with a maximum charge of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). The x402 challenge confirms the endpoint is live, accepts POST requests, and settles to address `0x1A2B...85F3` on Base. The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all return only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI spec, request/response schemas, or usage examples were found. The exact functionality behind `/api/v1/messages/58` is unclear from the available material — the description simply says \"Premium API Access\" without specifying what data or service it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per request api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — the /api, /pricing, and /README pages all return only a wallet-connect prompt.","The exact purpose of /api/v1/messages/58 ('Premium API Access') is not explained anywhere in the crawled material.","No request body schema or response schema is documented; callers must experiment to discover the interface.","The breadth of advertised endpoints (AI, finance, geo, etc.) could not be independently verified beyond the landing page listing."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/58","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/58","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 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific functionality of /api/v1/messages/58 is undescribed. Effectively a stub 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'/api/v1/messages/58':104,217 '/pricing':187 '/readme':189 '/request':18,36 '0.02':17,35,68,122,175 '000':117 '0x1a2b':144 '20':116 '6':127 '85f3':145 'accept':137 'access':110,230 'addit':152 'address':143 'advertis':151 'ai':12,30,55 'ai-inference' 'analysi':156 'analyt':54 'api':5,23,43,81,109,229 'attach':92 'avail':222 'base':8,26,76,118,147 'base network api' 'behind':216 'beyond':179 'broad':48 'broader':149 'call':4,22 'caller':90 'challeng':131 'charg':114 'classif':159 'classification' 'collect':49 'commit':89 'confirm':132 'connect':195 'convers':167 'cover':10,28 'crypto-quotes' 'data':11,29,53,169,234 'data-analytics' 'decim':128 'descript':225 'detail':202 'document':178 'embed':160 'embeddings' 'enabl':42 'endpoint':51,64,102,134,153 'everi':63 'exact':214 'exampl':210 'exchang':163 'export':170 'feed':162 'financ':13,31,58 'finance-data' 'found':212 'function':215 'geocod':165 'geocoding' 'header':96 'infrastructur':61 'key':82 'land':181 'learn':57 'limit':85 'list':106 'live':136 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'materi':223 'maximum':113 'micropayment api' 'minimum':88 'network':77 'offer':46 'openapi':204 'page':182 'pay':2,20 'pay per request api' 'pay-per-cal':1,19 'pay-per-call' 'payment':95 'per':3,21,69 'platform':44,150 'point':177 'post':138 'premium':108,228 'price':66,161,176 'prompt':197 'rate':84,164 'request':70,99,139 'request/response':206 'return':192,238 'rout':190 'say':227 'schema':207 'sentiment':155 'sentiment-analysis' 'servic':236 'settl':71,141 'simpli':91,226 'sinc':124 'span':52 'spars':184 'spec':205 'specif':101 'specifi':232 'suit':6,24 'summar':158 'technic':201 'text':157 'text-summarization' 'unclear':219 'unit':119 'usag':209 'usd':123 'usdc':9,27,73,121,125 'usdc api' 'usdc-base' 'use':126 'util':15,33,62 'utility-apis' 'valid':166 'wallet':196 'web3':59 'without':231 'x402':41,94,130 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"877efcab-eb59-4763-9b31-58c2ead2f61e","listingId":"8ba2b60d-7b4c-4af7-b28f-cfb4afdfa0fd","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.905Z"}],"sources":[{"listingId":"8ba2b60d-7b4c-4af7-b28f-cfb4afdfa0fd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.905Z","lastSeenAt":"2026-04-22T02:32:07.951Z"}],"details":{"listingId":"8ba2b60d-7b4c-4af7-b28f-cfb4afdfa0fd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/58 \\\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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live on Base network with USDC","source_url":"https://lowpaymentfee.com/api/v1/messages/58"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x8335…), which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/58"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time finance data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Low-volume or bursty workloads where subscription pricing is wasteful","Crypto-native applications already operating on the Base network"],"notFor":["High-volume production workloads needing 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":"2026-02-17T23:13:00.289Z"},"updatedAt":"2026-04-22T02:32:07.951Z"}}