{"id":"6e9d7fa7-518b-464c-a1d9-6fbe6a8a9721","shortId":"GYp9Me","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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. 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/126` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base.\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 x402 payment pattern: send a POST with an X-PAYMENT header containing a valid payment proof, and receive a JSON response.\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 crawl. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what request body the `/api/v1/transactions/126` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","crypto API payments"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/transactions/126 is not listed among the advertised APIs on the landing page — its purpose is unclear","No rate limit or SLA information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/126","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC per request). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific endpoint path (/api/v1/transactions/126) has no description beyond 'Premium API Access', making it essentially a 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'/api/v1/transactions/126':84,238 '/docs':185 '/pricing':187 '/readme':189 '/request':13,28 '0.02':12,27,59,105 '000':100 '20':99 '402':225 '6':110 'Base network API' 'USDC API' 'access':90 'advertis':116 'ai':126 'ai-inference' 'ai/ml':49 'analysi':130 'analyt':48,120 'api':5,20,37,71,89 'appear':153 'avail':216 'base':8,23,67,101,113 'bodi':236 'broad':42 'call':4,19 'captur':227 'categori':117 'challeng':95,226 'classif':133 'classification' 'collect':43 'commit':79 'confirm':223 'connect':195 'contain':170 'convers':149 'conversion' 'cost':58 'crawl':219 'crypto API payments' 'crypto-quotes' 'data':47,52,119,123 'data-analytics' 'decim':111 'detail':202 'document':180,211,230 'embed':134 'embeddings' 'enabl':36 'endpoint':45,57,82,152,221,239 'estim':144 'everi':56 'exampl':215 'exchang':139 'expect':240 'export':124 'extrem':182 'feed':138 'financ':135 'finance-data' 'finance/web3':51 'follow':155 'gas':143 'generat':150 'geocod':147 'geocoding' 'header':169 'includ':118 'infer':50 'infrastructur':146 'insight':125 'json':178 'key':72 'learn':128 'limit':75 'list':86 'live':224 'low payment fee' 'lowpaymentfee.com':31 'machin':127 'metric':121 'micropayment API' 'network':9,24,68 'offer':40 'openapi':206 'page':190 'paid':62 'pattern':160 'pay':2,17 'pay per call API' 'pay-per-cal':1,16 'pay-per-request' 'payment':159,168,173 'per':3,18,60 'platform':6,21,38,115 'post':163 'premium':88 'price':137 'prompt':197 'proof':174 'quot':142 'rate':74,140 'receiv':176 'render':192 'report':122 'request':61,96,235 'request/response':209 'respons':179 'return':92,244 'schema':210 'send':161 'sentiment':129 'sentiment-analysis' 'servic':55 'sinc':107 'span':46 'spars':183 'spec':207 'specif':81 'summar':132 'technic':201 'text':131 'text-summarization' 'token':141 'unclear':233 'unit':102 'upfront':78 'usag':214 'usd':106 'usdc':15,30,64,104,108 'usdc-base-network' 'use':109 'util':54 'valid':148,172 'validation' 'via':10,25 'wallet':196 'web3':136 'without':229 'x':167 'x-payment':166 'x402':11,26,35,94,158 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c1d35b8f-419a-4926-98e7-843a4227775c","listingId":"6e9d7fa7-518b-464c-a1d9-6fbe6a8a9721","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:31.570Z"}],"sources":[{"listingId":"6e9d7fa7-518b-464c-a1d9-6fbe6a8a9721","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/126","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:31.570Z","lastSeenAt":"2026-04-23T06:31:34.507Z"}],"details":{"listingId":"6e9d7fa7-518b-464c-a1d9-6fbe6a8a9721","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/126 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","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":"The x402 challenge for this endpoint requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/126"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto quotes with per-request USDC micropayments","Using utility services like geocoding and data validation on a pay-as-you-go basis","Programmatic data export and analytics without subscription commitments"],"bestFor":["Agents or developers who want keyless, pay-per-call API access settled in USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads needing SLAs, rate-limit guarantees, or detailed documentation","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.798Z"},"updatedAt":"2026-04-23T06:31:34.507Z"}}