{"id":"37332250-71d3-4dc8-a986-09531691092c","shortId":"nZw7Hq","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is a multi-category API platform that uses the x402 payment protocol to gate access to its endpoints. Instead of API keys or subscriptions, callers pay per request using USDC on the Base network. The platform advertises four endpoint categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request.\n\nThe specific endpoint being listed here — `/api/v1/orders/84` — is described as \"Premium API Access\" in the x402 challenge. Its maxAmountRequired is 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. The endpoint accepts POST requests and returns application/json. Payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no explanation of what the `/api/v1/orders/84` endpoint actually returns or what input it expects. The landing page lists many endpoints but provides no technical detail beyond names and prices. Prospective users should be aware that the actual functionality behind these endpoints is unverified from the available crawl data.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","json-response","post-method","no-api-key","pay-per-use"],"categories":["api-marketplace","misc"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-gated API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema available — request format and response structure are unknown.","The specific endpoint /api/v1/orders/84 is not listed on the landing page among the advertised APIs; its actual functionality is unclear.","No request or response examples are available from any source."],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/84","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/84","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 well-formed, confirming the endpoint exists and accepts payment. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of `/api/v1/orders/84` specifically is unclear — it could be a generic order endpoint or a demo. Effectively a stub 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'/call':19,38 '0.02':18,37,118,153 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':167 '0x8335':146 '20000':141 '300':170 '6':149 'Base network API' 'USDC API' 'accept':156 'access':55,133 'actual':211,240 'address':166 'advertis':77 'ai':12,31,87 'analysi':91 'analyt':82 'api':5,24,45,61,132,179 'application/json':161 'avail':249 'awar':237 'base':8,27,73,142,148 'behind':242 'beyond':229 'caller':65 'categori':44,80 'challeng':137 'classif':94 'connect':188 'content':194 'convers':111 'crawl':250 'crypto-gated API' 'data':11,30,81,251 'decim':150 'describ':129 'detail':228 'doc':178 'document':173 'embed':95 'endpoint':16,35,58,79,114,123,155,210,223,244 'equal':152 'estim':105 'exampl':202 'exchang':100 'expect':217 'explan':205 'export':85 'extrem':175 'feed':99 'financ':13,32,96 'four':78 'function':241 'gas':104 'gate':54 'generat':112 'geocod':109 'infrastructur':107 'input':215 'insight':86 'instead':59 'json-response' 'key':62 'land':219 'learn':89 'list':116,125,221 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':88 'mani':222 'maxamountrequir':139 'metric':83 'micropayment API' 'multi':43 'multi-categori':42 'name':230 'network':74 'no-api-key' 'openapi':198 'page':183,220 'pay':2,21,66 'pay-per-call API' 'pay-per-request':1,20 'pay-per-use' 'payment':51,162 'per':3,22,67,119 'per-request-billing' 'platform':46,76 'post':157 'post-method' 'premium':131 'price':98,180,232 'prompt':190 'prospect':233 'protocol':52 'provid':225 'quot':103 'rate':101 'readm':182 'render':185 'report':84 'request':4,23,68,120,158 'request/response':201 'return':160,212 'schema':199 'second':171 'sentiment':90 'settl':164 'spars':176 'specif':122 'subscript':64 'suit':6,25 'summar':93 'technic':227 'text':92 'timeout':172 'token':102 'unit':143 'unverifi':246 'usdc':70,145 'usdc-base' 'use':48,69 'user':234 'util':15,34,108 'valid':110 'via':9,28 'wallet':189 'web3':97 'x402':10,29,50,136 'x402 API' 'x402-payment'","prices":[{"id":"5016f0b7-bb11-434a-aedc-38720b84ffc1","listingId":"37332250-71d3-4dc8-a986-09531691092c","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:34.890Z"}],"sources":[{"listingId":"37332250-71d3-4dc8-a986-09531691092c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:34.890Z","lastSeenAt":"2026-04-22T12:03:13.329Z"}],"details":{"listingId":"37332250-71d3-4dc8-a986-09531691092c","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/orders/84 \\\n  -H 'Content-Type: application/json'\n# Response: 402 with X-Payment challenge (USDC on Base, $0.02)","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/orders/84 requires 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/orders/84"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need on-demand API access with crypto settlement"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without USDC on Base or an x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.54Z"},"updatedAt":"2026-04-22T12:03:13.329Z"}}