{"id":"f95086e6-9550-41c6-9aaa-d61d607a0f26","shortId":"XBSjbQ","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/item/1` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform also advertises 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, documentation beyond the landing page is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI spec, request/response schemas, or usage examples are available from the crawl.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint"],"warnings":["No OpenAPI or schema documentation available; all doc pages render only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/item/1 is undocumented","No request or response examples could be obtained","The breadth of advertised endpoints (AI, finance, geo, etc.) cannot be verified from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/1","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/item/1","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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation, and no examples — the docs pages all show only 'Connect wallet'. The purpose of /api/v1/item/1 specifically is unclear beyond the generic 'Premium API Access' 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'/api/v1/item/1':104 '/docs':197 '/pricing':199 '/readme':201 '/request':18,36 '0.02':17,35,68,136,184 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':130 '20':123 '2913':131 '300':151 '6':140 'access':110 'address':147 'advertis':119,158 'ai':12,30,55 'ai-inference' 'also':157 'analysi':162 'analyt':54 'api':5,23,43,81,109 'application/json':113 'asset':129 'attach':92 'avail':224 'base':8,26,76,125,133 'base network api' 'beyond':189 'broad':48 'broader':155 'call':4,22 'caller':90 'challeng':118 'classif':165 'classification' 'collect':49 'commit':89 'connect':207 'convers':177 'cover':10,28 'crawl':227 'crypto-quotes' 'data':11,29,53 'data-analytics' 'decim':141 'detail':214 'document':188 'embed':166 'embeddings' 'enabl':42 'endpoint':51,64,102,159 'equal':135 'estim':174 'everi':63 'exampl':222 'exchang':169 'extrem':194 'feed':168 'financ':13,31,58 'finance-data' 'gas':173 'generat':179 'geocod':175 'geocoding' 'given':137 'header':96 'howev':187 'infrastructur':61 'key':82 'land':191 'learn':57 'limit':85 'list':106 'low payment fee' 'lowpaymentfee.com':37 'machin':56 'maxamountrequir':121 'micropayment api' 'minimum':88 'network':77 'no-api-key endpoint' 'offer':46 'openapi':216 'page':192,202 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'payment':95,143 'per':3,21,69 'per-call-pricing' 'platform':44,156 'point':186 'post':115 'premium':108 'price':66,167,185 'prompt':209 'quot':172 'rate':84,170 'render':204 'request':70,99 'request/response':218 'return':112 'schema':219 'second':152 'sent':145 'sentiment':161 'sentiment-analysis' 'settl':71 'simpli':91 'span':52 'spars':195 'spec':217 'specif':101 'suit':6,24 'summar':164 'technic':213 'text':163 'text-summarization' 'timeout':153 'token':171 'unit':126 'usag':221 'usdc':9,27,73,128,138 'usdc api' 'usdc-base' 'util':15,33,62 'utility-apis' 'valid':176 'via':114 'wallet':208 'web3':59 'x402':41,94,117 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"d74cca9e-6fcc-44e0-b1be-6a657aa2f2c7","listingId":"f95086e6-9550-41c6-9aaa-d61d607a0f26","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/item/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:26.503Z"}],"sources":[{"listingId":"f95086e6-9550-41c6-9aaa-d61d607a0f26","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:26.503Z","lastSeenAt":"2026-04-23T18:03:20.311Z"}],"details":{"listingId":"f95086e6-9550-41c6-9aaa-d61d607a0f26","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/1 \\\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 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/item/1"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/item/1"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto quotes or gas estimates with per-call USDC micropayments","Geocoding or data validation as a utility service inside automated workflows","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, keyless API access","Micropayment-friendly workloads where $0.02/call is cost-effective"],"notFor":["High-volume batch processing where per-call pricing adds up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Callers who cannot settle payments on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.703Z"},"updatedAt":"2026-04-23T18:03:20.311Z"}}