{"id":"e49d3a1d-64ff-46bb-937c-ced8cf4bb905","shortId":"WJe8wR","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 offers a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/orders/54` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC (contract 0x8335…2913 on Base). The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader platform advertises four categories of APIs: 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 detailed documentation available from the crawl. The exact functionality behind the `/api/v1/orders/54` endpoint is unclear beyond its \"Premium API Access\" label. The x402 challenge is live and well-formed, confirming the endpoint is operational.","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-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","crypto api access","402 payment api"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific functionality of /api/v1/orders/54 ('Premium API Access') is not documented — unclear what it returns","No request or response examples available anywhere in the crawl","Platform appears to be a generic API marketplace; actual backend service quality and reliability are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/54","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/54","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 works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only 'Connect wallet' with no content. The specific purpose of /api/v1/orders/54 is undocumented beyond its generic 'Premium API Access' 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'/call':19,38 '0.02':18,37,98,147 '000':89 '0x8335':79 '20':88 '2913':80 '402 payment api' '6':94 'accept':71 'access':50,69,213 'advertis':104 'ai':12,31,116 'ai-inference' 'amount':85 'analysi':120 'analyt':110 'api':5,24,48,68,108,152,168,212 'avail':196 'base':8,27,58,82,90 'base usdc api' 'base-network' 'behind':203 'beyond':209 'broader':102 'categori':106 'challeng':217 'classif':123 'classification' 'collect':42 'commit':160 'confirm':224 'connect':177 'content':183 'contract':78 'convers':140 'crawl':199 'crypto api access' 'data':11,30,109,113 'data-analytics' 'decim':95 'detail':194 'doc':167 'document':162,195 'embed':124 'embeddings' 'endpoint':16,35,49,62,143,206,226 'equal':97 'estim':134 'exact':201 'exampl':191 'exchang':129 'export':114 'extrem':164 'feed':128 'financ':13,32,125 'finance-data' 'form':223 'four':105 'function':202 'gas':133 'generat':141 'geocod':138 'geocoding' 'infrastructur':136 'insight':115 'key':153 'label':66,214 'learn':118 'limit':156 'list':145 'live':219 'low payment fee' 'lowpaymentfee.com':39 'machin':117 'maximum':84 'metric':111 'micropayment api' 'minimum':159 'network':59 'no-api-key' 'offer':40 'openapi':187 'oper':228 'page':172 'pay':2,21,45 'pay per call api' 'pay-per-request':1,20,44 'payment':54,75 'per':3,22,46,99,148 'platform':103 'post':72 'premium':67,211 'price':127,169 'prompt':179 'protocol':55 'quot':132 'rate':130,155 'readm':171 'render':174 'report':112 'request':4,23,47,73,100,149 'request/response':190 'requir':86,161 'schema':188 'sentiment':119 'sentiment-analysis' 'settl':74 'spars':165 'specif':61 'suit':6,25 'summar':122 'text':121 'text-summarization' 'token':131 'unclear':208 'unit':91 'usdc':77,93 'usdc-settlement' 'util':15,34,137 'valid':139 'via':9,28,51 'wallet':178 'web3':126 'well':222 'well-form':221 'x402':10,29,53,216 'x402 api' 'x402-payment'","prices":[{"id":"dc00c5f2-4ad8-4766-b48e-179c8038a960","listingId":"e49d3a1d-64ff-46bb-937c-ced8cf4bb905","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:17.281Z"}],"sources":[{"listingId":"e49d3a1d-64ff-46bb-937c-ced8cf4bb905","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:17.281Z","lastSeenAt":"2026-04-23T13:30:32.311Z"}],"details":{"listingId":"e49d3a1d-64ff-46bb-937c-ced8cf4bb905","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/54 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/54"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/54"}],"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-request basis","Running data analytics queries and exporting data with micropayments","Using utility services like geocoding, validation, and conversion via crypto-native pay-per-use"],"bestFor":["Agents or developers who want API access without signup or API key provisioning","Crypto-native applications that can settle USDC on Base","Low-volume or sporadic API usage where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where per-request costs add up (no bulk discount documented)","Users who need detailed API documentation, request/response schemas, or SLA guarantees","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.356Z"},"updatedAt":"2026-04-23T13:30:32.311Z"}}