{"id":"f834d753-a74a-445e-a86f-827bf5588131","shortId":"ujTtXY","kind":"x402","title":"Pay-per-request API suite on Base via x402 — analytics, AI, finance, and utilities at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — analytics, AI, finance, and utilities at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network. There are no API keys, no rate limits, and no sign-up — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/orders/38` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform also exposes 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.\n\nDocumentation is extremely thin: 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 from the crawl. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is difficult to know what request body to send or what response to expect from this particular order endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","402 payment API"],"warnings":["No OpenAPI spec or machine-readable schema available","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no content","The purpose and expected request/response format of /api/v1/orders/38 is undocumented","No examples of successful responses are available from any source","The broad range of advertised endpoints (AI, finance, analytics, utilities) cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/38","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific purpose of /api/v1/orders/38 ('Premium API Access') is vague and 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'/api/v1/orders/38':106 '/call':18,36 '/docs':180 '/pricing':181 '/readme':184 '0.02':17,35,69,137,172 '000':126 '0x8335':131 '20':125 '2913':132 '402':220 '402 payment API' '6':141 'Base network API' 'USDC API' 'accept':114 'access':112 'advertis':120 'ai':12,30 'ai-inference' 'ai/ml':55 'also':145 'amount':123 'analysi':150 'analyt':11,29,54 'api':5,23,43,82,111 'attach':94 'avail':210 'base':8,26,77,127,134 'bodi':236 'broad':48 'caller':92 'challeng':119,225 'classif':153 'classification' 'collect':49 'confirm':217 'connect':190 'content':196 'convers':165 'crawl':213 'data':53,58 'data-analytics' 'decim':142 'difficult':231 'document':175,205,228 'embed':154 'embeddings' 'enabl':42 'endpoint':51,65,104,147,215,248 'equal':136 'estim':162 'everi':64 'exampl':209 'exchang':157 'expect':243 'expos':146 'extrem':177 'feed':156 'financ':13,31 'finance-data' 'finance/web3':57 'gas':161 'general':61 'general-purpos':60 'generat':167 'geocod':163 'geocoding' 'given':138 'header':98 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'x402-payment'","prices":[{"id":"abb0a188-3b09-48e0-879f-c727b29bc850","listingId":"f834d753-a74a-445e-a86f-827bf5588131","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:14.934Z"}],"sources":[{"listingId":"f834d753-a74a-445e-a86f-827bf5588131","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:14.934Z","lastSeenAt":"2026-04-22T23:00:57.539Z"}],"details":{"listingId":"f834d753-a74a-445e-a86f-827bf5588131","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/38 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/38"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/38"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use billing","Exporting analytics data or generating insights reports via micropayment-gated endpoints"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated utility and data endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.407Z"},"updatedAt":"2026-04-22T23:00:57.539Z"}}