{"id":"a793b0cd-4598-4493-9e44-c4d7c0c79262","shortId":"g4r2wJ","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call 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 utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/orders/31` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equates to $0.02 per call, consistent with the site's advertised flat pricing. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for 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 is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind this particular `/api/v1/orders/31` endpoint is unclear beyond its \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no technical content","The exact functionality of /api/v1/orders/31 ('Premium API Access') is undocumented — it is unclear what data or service it provides","The broad catalog of endpoints listed on the homepage cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/31","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/31","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 with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of this specific endpoint (/api/v1/orders/31) is unclear. The listing is essentially a stub with confirmed liveness and 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'/call':13,28 '0.02':12,27,64,129,181 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':117 '20':111 '2913':118 '300':149 '402':106 '6':124 'Base network API' 'USDC API' 'access':102,240 'account':76 'address':145 'advertis':137,155 'ai-inference' 'ai/ml':49 'analysi':159 'analyt':48 'api':5,20,37,74,101,191,239 'attach':84 'avail':221 'base':8,23,71,113,120 'base-network' 'behind':229 'beyond':236 'broad':42 'broader':153 'call':131 'caller':82 'catalog':43 'challeng':107 'classif':162 'connect':200 'consist':132 'convers':174 'crawl':224 'crypto-data' 'data':47,52 'data-analytics' 'decim':125 'detail':207 'doc':190 'document':185,216 'embed':163 'enabl':36 'endpoint':45,57,94,156,233 'equat':127 'estim':171 'exact':227 'exampl':220 'exchang':166 'extrem':187 'feed':165 'finance-data' 'finance/web3':51 'flat':138 'function':228 'gas':170 'generat':176 'geocod':172 'header':88 'howev':184 'infer':50 'key':75 'label':241 'limit':79 'list':98 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':225 'micropayment API' 'network':9,24,72 'no-api-key' 'offer':40 'openapi':211 'page':195 'particular':231 'pay':2,17,60 'pay per call API' 'pay-per-request':1,16,59 'payment':87,141 'per':3,18,61,130 'platform':6,21,38,154 'point':183 'premium':100,238 'price':139,164,182,192 'prompt':202 'quot':169 'rate':78,167 'readm':194 'render':197 'request':4,19,62,91,108 'request/response':214 'requir':81 'return':104 'schema':215 'second':150 'sent':143 'sentiment':158 'servic':55 'settl':66 'simpli':83 'sinc':121 'site':135 'span':46 'spars':188 'spec':212 'specif':93 'summar':161 'technic':206 'text':160 'timeout':151 'token':168 'unclear':235 'unit':114 'usag':219 'usdc':15,30,68,116,122 'usdc-settlement' 'use':123 'util':54 'utility-services' 'valid':173 'via':10,25 'wallet':201 'x402':11,26,35,86 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2b91f40e-89f0-4fbc-b4bd-8822b1ee3b94","listingId":"a793b0cd-4598-4493-9e44-c4d7c0c79262","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:20.704Z"}],"sources":[{"listingId":"a793b0cd-4598-4493-9e44-c4d7c0c79262","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:20.704Z","lastSeenAt":"2026-04-23T10:30:29.953Z"}],"details":{"listingId":"a793b0cd-4598-4493-9e44-c4d7c0c79262","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/31 \\\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, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equating to $0.02","source_url":"https://lowpaymentfee.com/api/v1/orders/31"},{"claim":"Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/orders/31"},{"claim":"The platform advertises endpoints for analytics, AI/ML, finance, and utility services","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","Integrating pay-as-you-go analytics, AI, or finance endpoints into agent workflows"],"bestFor":["Developers wanting zero-friction, keyless API access","AI agents that can settle x402 payments autonomously on Base","Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.196Z"},"updatedAt":"2026-04-23T10:30:29.953Z"}}