{"id":"cc9dbef4-3b7b-4272-9846-4f05c9b86f63","shortId":"bhx4RF","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. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers receive a 402 challenge with payment details, settle in USDC, and get their response.\n\nThe specific endpoint at `/api/v1/transactions/153` 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. The endpoint accepts POST requests and returns application/json. However, the exact functionality of this particular transactions endpoint is not documented — the site's landing page lists categories like analytics, AI, finance, and utilities, but does not describe a `/transactions/153` route specifically.\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 generation — all at the same $0.02 price point. Documentation pages beyond the landing page were effectively empty (showing only \"Connect wallet\"), so detailed request/response schemas for any endpoint are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance","ai"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access","402 payment protocol"],"warnings":["The exact purpose and response format of /api/v1/transactions/153 is not documented anywhere in the crawled material.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no actual content.","No OpenAPI spec, request schema, or response schema is available for any endpoint on this platform.","The broad catalog of endpoints (AI, analytics, finance, utilities) is advertised but none have verifiable documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/153","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/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, the specific functionality of /api/v1/transactions/153 is undocumented, no request/response schemas are available, and all documentation pages beyond the landing page are empty. The listing is largely inferred from the landing page and the 402 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'/request':13,28 '/transactions/153':176 '0.02':12,27,59,132,208 '000':121 '0x8335':126 '20':120 '2913':127 '402':89 '402 payment protocol' '6':136 'Base network API' 'USDC pay-per-call' 'accept':140 'access':111 'advertis':182 'ai':167 'ai/ml':49 'analysi':186 'analyt':48,166 'api':5,20,37,71,110 'application/json':145 'base':8,23,67,122,129 'beyond':213 'broad':42 'broader':180 'call':4,19 'caller':86 'catalog':43 'categori':164 'challeng':90,116 'classif':189 'commit':78 'connect':222 'convers':201 'cost':58 'crypto API access' 'data':47,52 'decim':137 'describ':174 'detail':93,225 'document':157,211 'effect':218 'embed':190 'empti':219 'enabl':36 'endpoint':45,57,103,139,154,183,230 'equal':131 'estim':198 'everi':56 'exact':148 'exchang':193 'feed':192 'financ':168 'finance/web3':51 'function':149 'gas':197 'generat':203 'geocod':199 'get':98 'given':133 'handl':83 'howev':146 'infer':50 'inlin':85 'json-response' 'key':72 'land':161,215 'like':165 'limit':75 'list':107,163 'lowpaymentfee' 'lowpaymentfee.com':31 'micropayment API' 'network':9,24,68 'no-api-key' 'offer':40 'page':162,212,216 'paid':62 'particular':152 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payment':84,92 'per':3,18,60 'platform':6,21,38,181 'point':210 'post':141 'post-method' 'premium':109 'price':191,209 'protocol':82 'quot':196 'rate':74,194 'receiv':87 'request':61,117,142 'request/response':226 'requir':79 'respons':100 'return':113,144 'rout':177 'schema':227 'sentiment':185 'servic':55 'settl':94 'show':220 'site':159 'span':46 'specif':102,178 'summar':188 'text':187 'token':195 'transact':153 'unavail':232 'unit':123 'usdc':15,30,64,96,125,134 'usdc-base-network' 'util':54,170 'valid':200 'via':10,25 'wallet':223 'x402':11,26,35,81,115 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"dea6ddfd-3bee-4e84-873c-421482ebd217","listingId":"cc9dbef4-3b7b-4272-9846-4f05c9b86f63","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/153","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:36.372Z"}],"sources":[{"listingId":"cc9dbef4-3b7b-4272-9846-4f05c9b86f63","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/153","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:36.372Z","lastSeenAt":"2026-04-22T13:31:45.346Z"}],"details":{"listingId":"cc9dbef4-3b7b-4272-9846-4f05c9b86f63","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/153 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header after settling USDC on Base.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/153","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/153"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/153"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need inline crypto-settled API access"],"bestFor":["Developers who want keyless, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation and schemas before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.6Z"},"updatedAt":"2026-04-22T13:31:45.346Z"}}