{"id":"7bea40fa-71c7-4a14-8b5d-6c904f764e9c","shortId":"WeMgK3","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 infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/302` is listed as \"Premium API Access\" and its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises additional endpoints including 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 extremely thin: the /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind this specific `/api/v1/transactions/302` endpoint and what data it returns is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content","The purpose and functionality of /api/v1/transactions/302 ('Premium API Access') is not described anywhere","The broad catalog of endpoints listed on the homepage cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/302","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/302","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming it accepts payments. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs/pricing/README pages are all empty stubs. The actual functionality of this specific endpoint (/api/v1/transactions/302) is entirely unclear — 'Premium API Access' is a generic label with no description of what data or service it 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'/api/v1/transactions/302':96,232 '/docs':192 '/pricing':193 '/readme':196 '/request':13,28 '0.02':12,27,64,124,179 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x8335':118 '20':112 '2913':119 '300':138 '6':128 'Base network API' 'USDC API' 'accept':143 'access':102 'actual':227 'addit':153 'address':134 'advertis':107,152 'ai/ml':49 'analysi':157 'analyt':48 'api':5,20,37,74,101 'application/json':148 'attach':84 'avail':222,243 'base':8,23,71,114,121 'base-network' 'behind':229 'beyond':184 'broad':42 'broader':150 'call':4,19 'caller':82 'catalog':43 'challeng':106 'classif':160 'connect':202 'content':208 'convers':172 'cost':110 'crawl':225 'crypto-paid API' 'data':47,52,236 'decim':129 'document':183,217 'embed':161 'enabl':36 'endpoint':45,57,94,142,154,233 'equal':123 'estim':169 'exampl':221 'exchang':164 'extrem':189 'feed':163 'finance/web3':51 'function':228 'gas':168 'generat':174 'geocod':170 'given':125 'header':88 'howev':182 'includ':155 'infer':50 'infrastructur':54 'json-response' 'key':75 'land':186 'limit':77 'list':98 'lowpaymentfee' 'lowpaymentfee.com':31 'made':132 'materi':244 'maximum':109 'micropayment API' 'network':9,24,72 'no-api-key' 'offer':40 'openapi':212 'page':187,197 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87,130 'per':3,18,61 'platform':6,21,38,151 'point':181 'post':144 'post-method' 'premium':100 'premium API access' 'price':162,180 'prompt':204 'quot':167 'rate':76,165 'request':62,91,145 'request/response':215 'requir':81 'return':147,199,238 'schema':216 'second':139 'sentiment':156 'settl':66 'simpli':83 'span':46 'spec':213 'specif':93,231 'subscript':79 'substant':207 'summar':159 'text':158 'thin':190 'timeout':140 'token':166 'unclear':240 'unit':115 'usag':220 'usdc':15,30,68,117,126 'usdc-settlement' 'util':55 'valid':171 'via':10,25 'wallet':203 'x402':11,26,35,86,105 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"9c6f2836-daa9-48a2-8b30-c9c046b5c1fc","listingId":"7bea40fa-71c7-4a14-8b5d-6c904f764e9c","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/302","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:53.175Z"}],"sources":[{"listingId":"7bea40fa-71c7-4a14-8b5d-6c904f764e9c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/302","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:53.175Z","lastSeenAt":"2026-04-23T14:31:35.306Z"}],"details":{"listingId":"7bea40fa-71c7-4a14-8b5d-6c904f764e9c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/302 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/302"},{"claim":"All endpoints are priced at $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 asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/302"}],"useCases":["Accessing premium API data without needing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need frictionless pay-per-use endpoints"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base network"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.496Z"},"updatedAt":"2026-04-23T14:31:35.306Z"}}