{"id":"45da4050-b002-4835-a56b-980fcbc873f4","shortId":"ajsgKb","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: Data & Analytics (metrics, reports, data 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 priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint being listed here — `/api/v1/orders/23` — is described as \"Premium API Access\" in the x402 challenge. Its 402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no sign-up required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The purpose of the `/api/v1/orders/23` path specifically (as opposed to the other listed endpoints) is unclear from the available material. The platform appears live: the root page returns 200 and the endpoint returns a well-formed 402 challenge.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API payment","402 payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages are effectively empty (only show 'Connect wallet')","The specific purpose and expected input/output of /api/v1/orders/23 ('Premium API Access') is not documented — it is unclear how it differs from other listed endpoints","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/23","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/23","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, and the landing page lists the catalog and pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page, and the specific purpose of /api/v1/orders/23 is unclear. Most pages return only 'Connect wallet' with no 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'/api/v1/orders/23':115,217 '/call':12,31 '/docs':182 '/pricing':183 '/readme':186 '0.02':11,30,99,142 '000':134 '0x8335':139 '20':133 '200':241 '402':127,250 '402 payment API' '6':146 'Base network API' 'USDC API' 'accept':171 'access':121 'across':58 'advertis':129 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,120,158 'appear':235 'application/json':176 'avail':212,231 'base':8,27,107,135 'base-network' 'broad':50 'catalog':51 'categori':60 'challeng':125,128,251 'classif':75 'classification' 'connect':192 'content':198 'convers':92 'crypto API payment' 'data':14,33,61,65 'data-analytics' 'decim':147 'describ':117 'document':177,207 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,95,111,170,226,244 'equal':141 'estim':86 'exact':154 'exampl':211 'exchang':81 'export':66 'extrem':179 'feed':80 'financ':16,35,77 'finance-data' 'form':249 'four':59 'gas':85 'generat':93 'geocod':90 'geocoding' 'given':143 'infrastructur':88 'insight':67 'key':159 'learn':70 'limit':162 'list':113,225 'live':236 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':150 'materi':232 'maxamountrequir':131 'metric':63 'micropayment API' 'network':108 'no-api-key' 'offer':48 'openapi':202 'oppos':221 'page':187,239 'path':218 'pay':2,21,54 'pay per call API' 'pay-per-request':1,20,53 'payment':148 'per':3,22,55,100 'platform':6,25,46,234 'post':172 'premium':119 'price':79,97 'prompt':194 'purpos':214 'quot':84 'rate':82,161 'render':189 'report':64 'request':4,23,56,101,173 'request/response':205 'requir':168 'return':175,240,245 'root':238 'schema':206 'scheme':155 'sentiment':71 'sentiment-analysis' 'settl':102 'sign':166 'sign-up':165 'spars':180 'spec':203 'specif':110,219 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':228 'unit':136 'usag':210 'usdc':104,138,144 'usdc-settlement' 'util':18,37,89 'valid':91 'via':9,28,151 'wallet':193 'web3':78 'well':248 'well-form':247 'x402':10,29,43,124,153 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"5b5bc148-0ee8-41b4-a23c-b9ac9db18198","listingId":"45da4050-b002-4835-a56b-980fcbc873f4","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:28.866Z"}],"sources":[{"listingId":"45da4050-b002-4835-a56b-980fcbc873f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:28.866Z","lastSeenAt":"2026-04-23T17:31:08.902Z"}],"details":{"listingId":"45da4050-b002-4835-a56b-980fcbc873f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/23 \\\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":"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 x402 challenge for /api/v1/orders/23 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/23"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /pricing, /api, and /README pages render only 'Connect wallet' with no further documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Developers who want instant API access without sign-up or API keys","Agents and bots that can settle payments in USDC on Base","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads needing SLAs, rate guarantees, or dedicated support","Users who cannot transact in USDC on the Base network","Anyone needing detailed API documentation or request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.678Z"},"updatedAt":"2026-04-23T17:31:08.902Z"}}