{"id":"ace38fdb-3049-4054-98ca-3b2f51fb36c7","shortId":"AXawDD","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/transactions/165` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior, request schemas, and response formats of these endpoints remain undocumented and unverifiable from the crawl material alone.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' — no substantive documentation available","No OpenAPI or schema definition found; request and response formats are unknown","The specific endpoint /api/v1/transactions/165 purpose is unclear — 'Premium API Access' is a generic label","Cannot verify that the advertised AI, finance, analytics, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/165","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/transactions/165","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 all documentation pages returned only 'Connect wallet' with no actual content. There is no OpenAPI spec, no request/response schema, and no examples of what the endpoint actually returns. The endpoint path '/api/v1/transactions/165' with description 'Premium API Access' is vague and doesn't clarify its 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'/api/v1/transactions/165':93 '/docs':179 '/pricing':180 '/readme':182 '/request':13,28 '0.02':12,27,74,120,173 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x8335':114 '20':108 '2913':115 '300':140 '6':124 'Base network API' 'USDC API' 'access':99 'actual':196 'address':136 'advertis':146 'ai-inference' 'ai/ml':49 'alon':214 'analysi':150 'analyt':48 'api':5,20,37,79,98 'base':8,23,67,110,117 'behavior':197 'broad':42 'broader':144 'call':4,19,76 'catalog':43 'challeng':104 'classif':153 'classification' 'commit':87 'connect':187 'content':193 'convers':165 'crawl':212 'crypto-quotes' 'data':47,52,167 'data-analytics' 'decim':125 'document':177 'embed':154 'embeddings' 'enabl':36 'endpoint':45,57,91,147,205 'equal':119 'estim':162 'exact':132 'exchang':157 'feed':156 'finance-data' 'finance/web3':51 'flat':71 'format':202 'gas':161 'generat':168 'geocod':163 'geocoding' 'given':121 'howev':176 'infer':50 'key':80 'limit':83 'list':95 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'made':128 'materi':213 'micropayment API' 'minimum':86 'network':9,24,68 'offer':40 'page':178 'paid':59 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':126 'per':3,18,61,75 'per-request':60 'platform':6,21,38,145 'point':175 'premium':97 'price':155,174 'prompt':189 'quot':160 'rate':72,82,158 'remain':206 'request':62,105,198 'requir':88 'respons':201 'return':101,184 'schema':199 'scheme':133 'second':141 'sentiment':149 'sentiment-analysis' 'servic':55 'settl':134 'span':46 'specif':90 'substant':192 'summar':152 'text':151 'text-summarization' 'timeout':142 'token':159 'undocu':207 'unit':111 'unverifi':209 'usdc':15,30,64,113,122 'usdc-base' 'use':63 'util':54 'utility-services' 'valid':164 'via':10,25,129 'wallet':188 'x402':11,26,35,103,131 'x402 API marketplace' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ae9d944b-9e3f-4124-8ca9-681273935099","listingId":"ace38fdb-3049-4054-98ca-3b2f51fb36c7","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/transactions/165","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:47.926Z"}],"sources":[{"listingId":"ace38fdb-3049-4054-98ca-3b2f51fb36c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/165","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:47.926Z","lastSeenAt":"2026-04-22T23:02:09.055Z"}],"details":{"listingId":"ace38fdb-3049-4054-98ca-3b2f51fb36c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/165 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/transactions/165","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat pricing of $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","source_url":"https://lowpaymentfee.com/api/v1/transactions/165"},{"claim":"Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates on a per-call basis","Running geocoding or data validation utilities with instant USDC micropayments","Exporting analytics data or generating reports via pay-as-you-go endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access via crypto","Agents or bots that need programmatic access to diverse utility endpoints settled on Base","Projects already holding USDC on Base looking for frictionless API consumption"],"notFor":["Users who need detailed API documentation and response schemas before integrating","High-volume consumers who need bulk pricing or subscription discounts","Teams that require fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.065Z"},"updatedAt":"2026-04-22T23:02:09.055Z"}}