{"id":"e9f1b048-369a-4709-8213-d83c569c5cec","shortId":"CEXkjj","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","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 is priced at $0.02 per request, payable in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/163` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge confirms it accepts POST requests with an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to `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 generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages only show \"Connect wallet\"), so the actual request/response schemas for this and other endpoints are unknown. Without documentation or OpenAPI specs, callers will need to experiment to discover the expected input format and response structure.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","no-rate-limits","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema documentation available — all doc/pricing/README pages are empty stubs showing only 'Connect wallet'.","The purpose and expected input/output of /api/v1/transactions/163 is unclear; 'Premium API Access' is a generic label with no further detail.","The broader platform lists many endpoints (AI, finance, utils) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/163","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/163","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 there is no OpenAPI spec, no documentation, no request/response schema, and no examples. All doc pages return only 'Connect wallet'. The specific purpose of /api/v1/transactions/163 ('Premium API Access') is vague and 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'/request':12,28 '0.02':11,27,63,142,187 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x8335':136 '20':130 '2913':137 '300':155 '6':146 'Base network API' 'USDC API' 'accept':118 'access':109 'actual':209 'advertis':161 'ai/ml':51 'analysi':165 'analyt':50 'api':5,14,21,30,39,80,108 'application/json':112 'attach':92 'base':8,24,71,132,139 'beyond':192 'broad':44 'broader':159 'call':4,20 'caller':90,224 'catalog':45 'challeng':115 'classif':168 'confirm':116 'connect':205 'convers':180 'data':49,54 'decim':147 'discov':230 'document':191,220 'embed':169 'empti':198 'enabl':38 'endpoint':47,59,101,162,216 'equal':141 'essenti':197 'estim':177 'everi':58 'exact':124 'exact-schem':123 'exchang':172 'expect':232 'experi':228 'feed':171 'finance/web3':53 'format':234 'gas':176 'generat':182 'geocod':178 'given':143 'header':95 'howev':190 'infer':52 'input':233 'json-api' 'key':15,31,81 'land':194 'limit':89 'list':105 'lowpaymentfee' 'lowpaymentfee.com':33 'mean':76 'micropayment API' 'need':226 'network':72 'no-api-key' 'no-rate-limits' 'offer':42 'openapi':222 'page':195,202 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payabl':66 'payment':94,126,148 'per':3,19,64 'platform':6,22,40,160 'point':189 'post':119 'post-method' 'premium':107 'premium API access' 'price':61,170,188 'protocol':75 'quot':175 'rate':88,173 'request':65,98,120 'request/response':210 'requir':16,32 'respons':236 'return':111 'schema':211 'scheme':125 'second':156 'sent':150 'sentiment':164 'servic':57 'show':204 'sign':84 'sign-up':83 'simpli':91 'span':48 'spec':223 'specif':100 'structur':237 'sub':201 'sub-pag':200 'summar':167 'text':166 'timeout':157 'token':174 'unit':133 'unknown':218 'up':85 'usdc':68,135,144 'usdc-base' 'util':56 'valid':179 'via':9,25 'wallet':206 'without':219 'x402':10,26,37,74,114 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"360b479d-2f8a-4d8b-bc40-bcca13a51b8d","listingId":"e9f1b048-369a-4709-8213-d83c569c5cec","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/163","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:55.829Z"}],"sources":[{"listingId":"e9f1b048-369a-4709-8213-d83c569c5cec","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/163","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:55.829Z","lastSeenAt":"2026-04-23T20:03:09.849Z"}],"details":{"listingId":"e9f1b048-369a-4709-8213-d83c569c5cec","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/163 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/163"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without creating accounts or managing API keys","Making one-off paid API calls from autonomous agents using x402 on Base","Integrating pay-as-you-go API access into Web3 workflows"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle payments via x402 on Base","Quick prototyping without API key management overhead"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume use cases where per-request pricing at $0.02 adds up significantly","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.719Z"},"updatedAt":"2026-04-23T20:03:09.849Z"}}