{"id":"73da3127-a318-493c-bcf1-c737b17ce0e7","shortId":"Lhkg8k","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/wire/151` is listed as \"Premium API Access\" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimal places. Payment is made via the x402 exact scheme, with a 300-second timeout. The endpoint accepts HTTP POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 usage examples available. The purpose of the `/api/v1/wire/151` endpoint specifically is unclear; it may be a generic wire transfer or proxy endpoint, but this cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API","serverless API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/wire/151 ('Premium API Access') is undocumented","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/151","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/wire/151","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 lists available APIs with pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page, and the specific purpose of /api/v1/wire/151 is unclear. Nearly all detail pages return only 'Connect wallet' with no 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'/api/v1/wire/151':123,220 '/docs':185 '/pricing':186 '/readme':189 '/request':12,31 '0.02':11,30,98,151 '000':140 '0x8335':145 '20':139 '2913':146 '300':168 '6':155 'Base network API' 'USDC API' 'accept':173 'access':129 'across':58 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,110,128 'application/json':179 'avail':215,241 'base':8,27,106,141,148 'broad':50 'call':4,23 'cannot':237 'catalog':51 'categori':60 'challeng':135 'classif':75 'classification' 'commit':117 'confirm':239 'connect':195 'content':201 'convers':91 'crypto-paid API' 'data':14,33,61,65 'data-analytics' 'decim':156 'document':180,210 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,94,121,172,221,234 'equal':150 'estim':86 'exact':164 'exampl':214 'exchang':81 'export':66 'extrem':182 'feed':80 'financ':16,35,77 'finance-data' 'four':59 'gas':85 'generat':92 'generic':229 'geocod':89 'geocoding' 'given':152 'http':174 'infrastructure/utilities':88 'insight':67 'key':111 'learn':70 'limit':114 'list':125 'low fee API' 'lowpaymentfee.com':39 'machin':69 'made':160 'materi':242 'may':226 'metric':63 'micropayment API' 'network':107 'no-api-key' 'offer':48 'openapi':205 'page':190 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payabl':101 'payment':158 'per':3,22,55,99 'per-request-billing' 'place':157 'platform':6,25,46 'post':175 'premium':127 'price':79,96 'prompt':197 'proxi':233 'purpos':217 'quot':84 'rate':82,113 'render':192 'report':64 'request':56,100,136,176 'request/response':208 'requir':118 'return':131,178 'schema':209 'scheme':165 'second':169 'sentiment':71 'sentiment-analysis' 'serverless API' 'spars':183 'spec':206 'specif':120,222 'standard':133 'summar':74 'text':73 'text-summarization' 'timeout':170 'token':83 'transfer':231 'unclear':224 'unit':142 'usag':213 'usdc':103,144,153 'usdc-base' 'util':18,37 'utility-apis' 'valid':90 'via':9,28,161 'wallet':196 'web3':78 'wire':230 'x402':10,29,43,134,163 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7f13ca8f-b86c-4878-bc28-bafafeef7f66","listingId":"73da3127-a318-493c-bcf1-c737b17ce0e7","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/wire/151","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:52.509Z"}],"sources":[{"listingId":"73da3127-a318-493c-bcf1-c737b17ce0e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/151","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:52.509Z","lastSeenAt":"2026-04-22T07:32:00.417Z"}],"details":{"listingId":"73da3127-a318-493c-bcf1-c737b17ce0e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/151 \\\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":"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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/wire/151"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data like token quotes, gas estimates, and exchange rates via micropayments","Running data analytics queries (metrics, reports, insights) with per-call billing","Utility operations like geocoding, validation, and data conversion paid per request"],"bestFor":["AI agents and bots that need keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for occasional API calls","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.882Z"},"updatedAt":"2026-04-22T07:32:00.417Z"}}