{"id":"9408a01c-d8d6-425c-8f22-d03fcd2e7986","shortId":"qgjZV2","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, 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/ML inference, finance/Web3 data, and general utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe probed endpoint (`/api/v1/invoices/1`) is listed as \"Premium API Access\" and returned a valid 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The platform advertises additional endpoint families including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation is extremely thin: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual behavior and response formats of the various endpoints are unknown beyond what the landing page lists.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","analytics-api","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas-estimates","geocoding","data-export","validation","conversion"],"categories":["ai","finance","geo","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","sentiment analysis api","text summarization api","embeddings api","crypto price feed"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definitions found; request and response formats are unknown","The probed endpoint is /api/v1/invoices/1 which may be a demo/placeholder rather than a primary API endpoint","Actual functionality of listed endpoints (AI, analytics, finance, etc.) is unverifiable from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/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/invoices/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 and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, and no examples. The landing page lists many endpoints but provides no detail on inputs or outputs. This is effectively a stub 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'/api/v1/invoices/1':106 '/docs':174 '/pricing':175 '/readme':178 '/request':18,36 '0.02':17,35,67,128,166 '000':123 '20':122 '402':117 '6':133 'access':112 'actual':210 'addit':140 'advertis':139 'ai':12,30 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':145 'analyt':11,29,54 'analytics-api' 'api':5,23,43,84,111 'attach':95 'avail':205 'base':8,26,75,124,136 'base network api' 'behavior':211 'beyond':221 'broad':48 'call':4,22 'caller':93 'challeng':118 'classif':148 'collect':49 'commit':92 'connect':184 'convers':158 'conversion' 'cover':10,28 'crawl':208 'crypto price feed' 'crypto-gas-estimates' 'data':53,58,160 'data-export' 'decim':134 'detail':191 'document':169,200 'embed':149 'embeddings api' 'enabl':42 'endpoint':51,63,105,141,218 'estim':155 'everi':62 'exampl':204 'exchang':152 'exchange-rates' 'export':161 'extrem':171 'famili':142 'feed':151 'financ':13,31 'finance-prices' 'finance/web3':57 'format':214 'gas':154 'general':60 'geocod':156 'geocoding' 'header':99 'includ':143 'infer':56 'key':85 'land':224 'limit':88 'list':108,226 'low payment fee' 'lowpaymentfee.com':37 'micropayment api' 'network':76 'offer':46 'openapi':195 'page':179,225 'paid':70 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':98 'per':3,21,68 'platform':44,138 'point':168 'premium':110 'price':65,150,167 'probe':104 'prompt':186 'protocol':80 'rate':87,153 'render':181 'request':69,102,119 'request/response':198 'respons':213 'return':114 'schema':199 'sentiment':144 'sentiment analysis api' 'simpli':94 'sinc':130 'span':52 'spec':196 'suit':6,24 'summar':147 'technic':190 'text':146 'text summarization api' 'thin':172 'unit':125 'unknown':220 'upfront':91 'usag':203 'usd':129 'usdc':9,27,72,127,131 'usdc api' 'usdc-base' 'use':132 'util':15,33,61 'valid':116,157 'validation' 'various':217 'via':77 'wallet':185 'x402':41,79,97 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"b21e319d-3ed5-411e-a6d2-ba19bd9caf65","listingId":"9408a01c-d8d6-425c-8f22-d03fcd2e7986","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/invoices/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":"2026-04-18T18:35:14.451Z"}],"sources":[{"listingId":"9408a01c-d8d6-425c-8f22-d03fcd2e7986","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:14.451Z","lastSeenAt":"2026-04-23T00:31:09.134Z"}],"details":{"listingId":"9408a01c-d8d6-425c-8f22-d03fcd2e7986","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/1 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returned 402 with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/invoices/1"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding addresses or validating data on a per-request payment basis","Exporting analytics data or generating reports with no rate limits","Generating text embeddings for search or classification tasks"],"bestFor":["Developers who want instant, keyless API access paid per call in USDC","AI agents that can autonomously pay for API calls via x402 on Base","Projects needing low-cost, commitment-free access to diverse utility endpoints"],"notFor":["Teams requiring detailed API documentation, SLAs, or guaranteed uptime","High-volume production workloads where $0.02/request adds up significantly","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.302Z"},"updatedAt":"2026-04-23T00:31:09.134Z"}}