{"id":"210ffc51-c324-4b5b-be3d-1eaf294714bb","shortId":"U66DKU","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 marketplace that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/183` is listed as \"Premium API Access\" and accepts POST requests settled via the x402 exact-payment scheme.\n\nThe platform advertises categories including 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 (geocoding, validation, conversion, generation). All endpoints appear to follow the same $0.02 USDC pricing model.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 crawled material. The x402 challenge confirms the endpoint is live and accepts POST with a maxAmountRequired of 20000 base units (USDC with 6 decimals = $0.02), paying to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api marketplace","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","No request or response examples are documented — input/output formats are unknown","The specific endpoint /api/v1/transactions/183 ('Premium API Access') is not listed among the advertised API categories on the homepage, making its purpose unclear","Cannot verify what data or functionality this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/183","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/183","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 confirms pricing and payment details, but documentation is essentially nonexistent — every doc page just shows 'Connect wallet'. No OpenAPI spec, no request/response schemas, no examples. The specific endpoint '/api/v1/transactions/183' has no description beyond its title. This is effectively a stub 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'/api/v1/transactions/183':84 '/docs':156 '/pricing':158 '/readme':160 '/request':13,28 '0.02':12,27,59,147,214 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':218 '20000':207 '6':212 'accept':92,201 'access':90 'address':217 'advertis':105 'ai':115 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':119 'analyt':48,109 'api':5,20,37,71,89 'appear':142 'avail':187 'base':8,23,67,208,220 'base network api' 'broad':42 'call':4,19 'categori':106 'challeng':194 'classif':122 'commit':79 'confirm':195 'connect':166 'convers':138 'conversion' 'cost':58 'crawl':190 'crypto-gas-estimates' 'data':47,52,108,112 'data-analytics' 'decim':213 'detail':173 'document':151,182 'embed':123 'enabl':36 'endpoint':45,57,82,141,197 'estim':133 'everi':56 'exact':100 'exact-pay':99 'exampl':186 'exchang':128 'exchange-rates' 'export':113 'extrem':153 'feed':127 'financ':124 'finance-prices' 'finance/web3':51 'follow':144 'gas':132 'generat':139 'geocod':136 'geocoding' 'includ':107 'infer':50 'infrastructur':54,135 'insight':114 'key':72 'learn':117 'limit':75 'list':86 'live':199 'low payment fee' 'lowpaymentfee.com':31 'machin':116 'marketplac':38 'materi':191 'maxamountrequir':205 'metric':110 'micropayment api' 'model':150 'network':9,24,68 'no-api-key endpoint' 'offer':40 'openapi':177 'page':161 'paid':62 'pay':2,17,215 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':101 'per':3,18,60 'platform':6,21,104 'post':93,202 'premium':88 'price':126,149 'prompt':168 'quot':131 'rate':74,129 'render':163 'report':111 'request':61,94 'request/response':180 'schema':181 'scheme':102 'sentiment':118 'set':43 'settl':95 'span':46 'spars':154 'spec':178 'specif':81 'summar':121 'technic':172 'text':120 'token':130 'unit':209 'upfront':78 'usag':185 'usdc':15,30,64,148,210 'usdc api' 'usdc-base' 'util':55 'valid':137 'validation' 'via':10,25,96 'wallet':167 'web3':125 'x402':11,26,35,98,193 'x402 api marketplace' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1b10eb33-76fb-42f4-b9e3-cb428258acbb","listingId":"210ffc51-c324-4b5b-be3d-1eaf294714bb","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/183","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":"210ffc51-c324-4b5b-be3d-1eaf294714bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/183","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:47.926Z","lastSeenAt":"2026-04-22T13:31:45.866Z"}],"details":{"listingId":"210ffc51-c324-4b5b-be3d-1eaf294714bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/183 \\\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 cost $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 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/183"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/transactions/183"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance and crypto market data on a per-request payment basis","Running data analytics queries and exporting reports via pay-as-you-go USDC micropayments","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle x402 payments in USDC on Base","Low-volume or sporadic usage where per-call pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Developers not set up for crypto payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.083Z"},"updatedAt":"2026-04-22T13:31:45.866Z"}}