{"id":"37a003ba-7e0d-453a-b2d7-7a43dbab647e","shortId":"ERWPLq","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/charges/120` is listed as \"Premium API Access\" and carries a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform advertises no API keys, no rate limits, no minimums, and instant access — payment is handled entirely through the x402 payment header. The probe confirmed the endpoint is live, returning a proper 402 challenge with x402Version 1.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoint actually returns. The name \"Premium API Access\" and the path `/api/v1/charges/120` do not clearly indicate what data or functionality this specific endpoint provides. Without documentation or example responses, it is unclear what payload to send or what to expect back.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee","402 payment api"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are empty beyond a wallet connect prompt","No OpenAPI or schema definition found for any endpoint","The specific purpose of /api/v1/charges/120 ('Premium API Access') is not explained anywhere","No example request or response payloads are documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/120","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/charges/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and the landing page provides a catalog overview with pricing. However, there is no OpenAPI spec, no request/response documentation, no examples, and the specific endpoint's purpose ('Premium API Access' at /charges/120) is unclear. All secondary pages render only 'Connect wallet' with no 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'/api/v1/charges/120':117,234 '/docs':191 '/pricing':193 '/readme':195 '/request':19,38 '0.02':18,37,99,142 '000':131 '0x8335':136 '1':185 '20':130 '2913':137 '402':181 '402 payment api' '6':146 'access':123,161,230 'across':58 'actual':224 'advertis':150 'ai':12,31,68 'ai-inference' 'amount':128 'analysi':72 'analyt':62 'api':5,24,45,122,152,229 'back':263 'base':8,27,107,132,139 'base usdc api' 'broad':50 'call':4,23 'carri':125 'catalog':51 'categori':60 'challeng':182 'classif':75 'classification' 'clear':237 'confirm':173 'connect':201 'content':207 'convers':92 'data':11,30,61,65,240 'data-analytics' 'decim':147 'document':186,216,248 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,175,223,245 'entir':165 'equal':141 'estim':86 'exampl':219,250 'exchang':81 'expect':262 'export':66 'extrem':188 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':242 'gas':85 'generat':93 'geocod':90 'geocoding' 'given':143 'handl':164 'header':170 'indic':238 'infrastructur':88 'insight':67 'instant':160 'key':153 'learn':70 'limit':156 'list':119 'live':177 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'max':127 'metric':63 'micropayment api' 'minimum':158 'name':227 'network':108 'offer':48 'openapi':211 'page':196 'paid':102 'path':233 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':256 'payment':162,169 'per':3,22,55,100 'platform':6,25,46,149 'premium':121,228 'price':79,97 'probe':172 'prompt':203 'proper':180 'protocol':112 'provid':246 'quot':84 'rate':82,155 'render':198 'report':64 'request':56,101 'request/response':214 'respons':251 'return':178,225 'schema':215 'send':258 'sentiment':71 'sentiment-analysis' 'spars':189 'spec':212 'specif':114,244 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':254 'unit':133 'usdc':104,135,144 'usdc-base' 'util':15,34,89 'utility-apis' 'valid':91 'via':9,28,109 'wallet':202 'web3':78 'without':247 'x402':10,29,43,111,168 'x402 api' 'x402-enabled':42 'x402-payment' 'x402version':184","prices":[{"id":"72df3a1b-488e-4b84-aea7-a7f7039f09a1","listingId":"37a003ba-7e0d-453a-b2d7-7a43dbab647e","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/charges/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:06.719Z"}],"sources":[{"listingId":"37a003ba-7e0d-453a-b2d7-7a43dbab647e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/120","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:06.719Z","lastSeenAt":"2026-04-23T11:03:19.357Z"}],"details":{"listingId":"37a003ba-7e0d-453a-b2d7-7a43dbab647e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/120 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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":"Endpoint returns 402 with maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/120"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding or data validation with crypto micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access via crypto","Agents or bots that need programmatic API access without signup or API keys","Projects already on the Base network looking for cheap per-call services"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.319Z"},"updatedAt":"2026-04-23T11:03:19.357Z"}}