{"id":"14435195-4db9-4277-85fc-100eaaccfe06","shortId":"EmYndv","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 pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are settled on the Base network using USDC, with a uniform price of $0.02 per request. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/orders/7` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, all at the same $0.02 price point.\n\nDocumentation 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 `/api/v1/orders/7` (\"Premium API Access\") is unclear beyond the generic label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment api","crypto api gateway"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of '/api/v1/orders/7' ('Premium API Access') is not explained anywhere in the crawled material","The broader platform advertises many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/7","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/7","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, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what 'Premium API Access' at /api/v1/orders/7 actually returns. The listing is effectively a stub with confirmed 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'/api/v1/orders/7':104,219 '/call':13,28 '/docs':180 '/pricing':181 '/readme':184 '0.02':12,27,74,131,172 '000':120 '0x8335':125 '20':119 '2913':126 '402':114 '402 payment api' '6':135 'accept':139 'access':110,222 'across':50 'actual':216 'addit':149 'advertis':148 'ai/ml':53 'analysi':153 'analyt':52 'api':5,20,37,81,109,221 'application/json':144 'attach':92 'avail':210 'base':8,23,65,121,128 'base usdc api' 'base-network' 'behind':218 'beyond':225 'broad':42 'broader':146 'caller':90 'catalog':43 'challeng':115 'classif':156 'commit':89 'connect':190 'content':196 'convers':164 'crawl':213 'crypto api gateway' 'data':51,166 'decim':136 'document':175,205 'embed':157 'enabl':36 'endpoint':49,60,102,138,150 'equal':130 'exampl':209 'exchang':160 'export':167 'extrem':177 'feed':159 'finance/web3':55 'function':217 'generic':227 'geocod':162 'given':132 'header':96 'infer':54 'json-response' 'key':82 'label':228 'limit':85 'list':106 'low payment fee' 'lowpaymentfee.com':31 'materi':214 'micropayment api' 'network':9,24,66 'no-api-key' 'offer':40 'openapi':200 'page':185 'pay':2,17,46 'pay per call api' 'pay-per-request':1,16,45 'payment':95 'per':3,18,47,75 'platform':6,21,38,78,147 'point':174 'post':140 'post-method' 'premium':108,220 'price':72,158,173 'prompt':192 'rate':84,161 'render':187 'request':4,19,48,76,99,116,141 'request/response':203 'requir':79 'return':112,143 'schema':204 'sentiment':152 'servic':58 'settl':62 'simpli':91 'spars':178 'spec':201 'specif':101 'substant':195 'summar':155 'text':154 'unclear':224 'uniform':71 'unit':122 'upfront':88 'usag':208 'usdc':15,30,68,124,133 'usdc-settlement' 'use':67 'util':57 'valid':163 'via':10,25 'wallet':191 'x402':11,26,35,94 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d56051fc-db8a-4730-8579-24d5c4af40da","listingId":"14435195-4db9-4277-85fc-100eaaccfe06","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:00.172Z"}],"sources":[{"listingId":"14435195-4db9-4277-85fc-100eaaccfe06","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:00.172Z","lastSeenAt":"2026-04-23T13:30:31.579Z"}],"details":{"listingId":"14435195-4db9-4277-85fc-100eaaccfe06","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/7 \\\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":"Uniform pricing of $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/orders/7"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to various API services with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol","Agents needing keyless pay-per-request API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume use cases where per-call pricing may be inefficient compared to subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.17Z"},"updatedAt":"2026-04-23T13:30:31.579Z"}}