{"id":"18aab0f1-00d8-40e3-916e-d27c6f816e7f","shortId":"NVtBTp","kind":"x402","title":"Pay-per-request API suite on Base (USDC) via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API suite on Base (USDC) via x402 — $0.02/call, no API keys required.","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. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/orders/52` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform also hosts endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation 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 `/api/v1/orders/52` (and most other endpoints) is unclear beyond the generic label \"Premium API Access.\"","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","crypto"],"synonyms":["low payment fee","x402 API","USDC API","pay-per-call API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content","The actual functionality of /api/v1/orders/52 ('Premium API Access') is unclear — no input/output schema documented","The broader platform lists many endpoints but none have documented request/response formats"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/52","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/orders/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The actual functionality behind this specific endpoint is unknown beyond the generic 'Premium API Access' 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'/api/v1/orders/52':99,214 '/call':13,30 '/docs':176 '/pricing':177 '/readme':180 '0.02':12,29,63,130,164 '000':119 '0x8335':124 '20':118 '2913':125 '6':134 'Base network API' 'USDC API' 'accept':107 'access':105,227 'actual':211 'advertis':113 'ai-inference' 'ai/ml':53 'also':138 'amount':116 'analysi':143 'analyt':52 'api':5,15,22,32,41,76,104,226 'attach':87 'avail':206 'base':8,25,71,120,127 'behind':213 'beyond':168,221 'broad':46 'caller':85 'challeng':112 'classif':146 'collect':47 'commit':84 'connect':186 'content':192 'convers':156 'cost':62 'crawl':209 'data':51,56,158 'data-analytics' 'decim':135 'document':167,201 'embed':147 'enabl':40 'endpoint':49,61,97,140,218 'equal':129 'estim':153 'everi':60 'exampl':205 'exchang':150 'export':159 'extrem':173 'feed':149 'finance-data' 'finance/web3':55 'function':212 'gas':152 'generic':223 'geocod':154 'given':131 'header':91 'host':139 'infer':54 'key':16,33,77 'label':224 'land':170 'limit':80 'list':101 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'max':115 'micropayment API' 'network':72 'no-api-key' 'offer':44 'openapi':196 'page':171,181 'paid':66 'pay':2,19 'pay-per-call API' 'pay-per-request':1,18 'payment':90 'per':3,20,64 'platform':42,137 'point':166 'post':108 'post-endpoint' 'premium':103,225 'price':148,165 'prompt':188 'rate':79,151 'request':4,21,65,94,109 'request/response':199 'requir':17,34 'return':183 'schema':200 'sentiment':142 'servic':59 'simpli':86 'span':50 'spec':197 'specif':96 'subscript':83 'substant':191 'suit':6,23 'summar':145 'text':144 'thin':174 'unclear':220 'unit':121 'usag':204 'usdc':9,26,68,123,132 'usdc-base-network' 'util':58 'utility-services' 'valid':155 'via':10,27 'wallet':187 'x402':11,28,39,89,111 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"b39e488c-31b2-4dc6-b1a1-28e030fc3e24","listingId":"18aab0f1-00d8-40e3-916e-d27c6f816e7f","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/orders/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:12.802Z"}],"sources":[{"listingId":"18aab0f1-00d8-40e3-916e-d27c6f816e7f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:12.802Z","lastSeenAt":"2026-04-23T10:30:29.616Z"}],"details":{"listingId":"18aab0f1-00d8-40e3-916e-d27c6f816e7f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/52 \\\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/orders/52"},{"claim":"All endpoints are 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":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/52"}],"useCases":["Accessing various data, AI, finance, and utility APIs without needing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base via x402","Integrating pay-per-request endpoints into agent workflows without upfront commitments"],"bestFor":["Developers wanting zero-friction API access without registration","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost, on-demand API calls across multiple domains"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.682Z"},"updatedAt":"2026-04-23T10:30:29.616Z"}}