{"id":"f2437b3f-d15a-45b5-8fff-3f259e32b328","shortId":"kJP64Y","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 at `/api/v1/orders/88` is labeled \"Premium API Access\" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render 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 crawled material. The actual functionality behind the `/api/v1/orders/88` path is unclear; it may be a generic order-retrieval endpoint or a demonstration resource. Without further documentation, the precise input parameters and response format cannot be determined.","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","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee"],"warnings":["No OpenAPI specification or request/response schema available","Documentation pages (/docs, /pricing, /README) contain no substantive content","The specific functionality of /api/v1/orders/88 ('Premium API Access') is not documented — unclear what it returns","No examples of request payloads or response formats available from crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/88","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/88","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 challenge, and the landing page lists a broad catalog with clear 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/88 is unclear. The docs, pricing, and README pages are all empty wallet-connect 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'/api/v1/orders/88':113,220 '/call':12,31 '/docs':180 '/pricing':181 '/readme':184 '0.02':11,30,99,134 '000':129 '20':128 '6':139 'accept':165 'access':118 'across':58 'actual':216 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,117,153 'application/json':170 'avail':210 'base':8,27,107,130,142 'base usdc api' 'base-network' 'behind':218 'beyond':172 'broad':50 'cannot':247 'catalog':51 'categori':60 'challeng':124 'classif':75 'classification' 'commit':161 'connect':190 'content':196 'convers':92 'crawl':213 'data':14,33,61,65 'data-analytics' 'decim':140 'demonstr':235 'determin':249 'document':171,205,239 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,95,111,164,232 'estim':86 'exact':149 'exampl':209 'exchang':81 'export':66 'extrem':177 'feed':80 'financ':16,35,77 'finance-data' 'format':246 'four':59 'function':217 'gas':85 'generat':93 'generic':228 'geocod':90 'geocoding' 'infrastructur':88 'input':242 'insight':67 'key':154 'label':115 'land':174 'learn':70 'limit':157 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':145 'materi':214 'may':225 'metric':63 'micropayment api' 'network':108 'no-api-key' 'offer':48 'openapi':200 'order':230 'order-retriev':229 'page':175,185 'paramet':243 'path':221 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':143 'per':3,22,55,100 'platform':6,25,46 'post':166 'precis':241 'premium':116 'price':79,97 'prompt':192 'quot':84 'rate':82,156 'render':187 'report':64 'request':4,23,56,101,125,167 'request/response':203 'requir':162 'resourc':236 'respons':245 'retriev':231 'return':120,169 'schema':204 'scheme':150 'sentiment':71 'sentiment-analysis' 'settl':102 'sinc':136 'spars':178 'spec':201 'specif':110 'standard':122 'substant':195 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':223 'unit':131 'upfront':160 'usag':208 'usd':135 'usdc':104,133,137 'usdc-settlement' 'use':138 'util':18,37,89 'valid':91 'via':9,28,146 'wallet':191 'web3':78 'without':237 'x402':10,29,43,123,148 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"51cc4b2f-2200-41c7-817b-e5e4cbcd6015","listingId":"f2437b3f-d15a-45b5-8fff-3f259e32b328","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:51.917Z"}],"sources":[{"listingId":"f2437b3f-d15a-45b5-8fff-3f259e32b328","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:51.917Z","lastSeenAt":"2026-04-22T23:00:56.208Z"}],"details":{"listingId":"f2437b3f-d15a-45b5-8fff-3f259e32b328","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/88 \\\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 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":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/88"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with instant pay-per-use billing","Using utility services like geocoding, validation, and conversion without subscription commitments"],"bestFor":["Agents or developers who want instant API access without registration or API keys","Low-volume or sporadic usage where per-request pricing is more economical than subscriptions","Crypto-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime commitments","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.486Z"},"updatedAt":"2026-04-22T23:00:56.208Z"}}