{"id":"09bb24f2-dcd1-4ec0-af0a-bdceceace01c","shortId":"xd7f3N","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 settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/orders/15` is labeled \"Premium API Access\" and requires a POST request with payment of up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call.\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 beyond the landing page 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 x402 challenge on the probed endpoint is live and well-formed, confirming the payment mechanism works, but the actual functionality behind this specific `/orders/15` endpoint is unclear beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","crypto API access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","Docs, pricing, API, and README pages all render only 'Connect wallet' with no content","The specific functionality of /api/v1/orders/15 ('Premium API Access') is not documented — unclear what it returns","No request body schema or response examples are available anywhere in the crawled material","Cannot verify that the advertised AI, finance, and data endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/15","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/15","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 accepts payment on Base with USDC at $0.02. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/orders/15 is unclear. The docs/pricing/API pages are all blank beyond a wallet connect 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'/call':19,38 '/orders/15':227 '0.02':18,37,88,142 '000':82 '20':81 '6':92 'Base network API' 'USDC API' 'access':70,236 'actual':222 'advertis':99 'ai':12,31,111 'ai-inference' 'analysi':115 'analyt':105 'api':5,24,48,69,103,147,167,235 'avail':197 'base':8,27,57,83 'base-network' 'behind':224 'beyond':158,231 'broader':97 'call':95 'categori':101 'challeng':204 'classif':118 'classification' 'collect':42 'commit':155 'confirm':215 'connect':176 'convers':135 'crawl':200 'crypto API access' 'data':11,30,104,108 'data-analytics' 'decim':93 'detail':183 'doc':166 'document':157,192 'embed':119 'embeddings' 'endpoint':16,35,49,63,138,208,228 'estim':129 'exampl':196 'exchang':124 'export':109 'extrem':163 'feed':123 'financ':13,32,120 'finance-data' 'form':214 'four':100 'function':223 'gas':128 'generat':136 'generic':233 'geocod':133 'geocoding' 'given':89 'i.e':87 'infrastructur':131 'insight':110 'key':148 'label':67,237 'land':160 'learn':113 'limit':151 'list':140 'live':210 'low payment fee' 'lowpaymentfee.com':39 'machin':112 'materi':201 'mechan':218 'metric':106 'micropayment API' 'minimum':154 'network':58 'no-api-key' 'offer':40 'openapi':187 'page':161,171 'pay':2,21,45 'pay per call API' 'pay-per-request':1,20,44 'payment':77,217 'per':3,22,46,94,143 'platform':98 'post':74 'premium':68,234 'price':122,168 'probe':207 'prompt':178 'protocol':54 'quot':127 'rate':125,150 'readm':170 'render':173 'report':107 'request':4,23,47,75,144 'request/response':190 'requir':72,156 'schema':191 'sentiment':114 'sentiment-analysis' 'settl':50 'spars':164 'spec':188 'specif':62,226 'suit':6,25 'summar':117 'technic':182 'text':116 'text-summarization' 'token':126 'unclear':230 'unit':84 'usag':195 'usdc':60,86,90 'usdc-settlement' 'use':59 'util':15,34,132 'valid':134 'via':9,28,51 'wallet':177 'web3':121 'well':213 'well-form':212 'work':219 'x402':10,29,53,203 'x402 API' 'x402-payment'","prices":[{"id":"20f6351a-5a63-459f-b342-a4136697e010","listingId":"09bb24f2-dcd1-4ec0-af0a-bdceceace01c","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:28.289Z"}],"sources":[{"listingId":"09bb24f2-dcd1-4ec0-af0a-bdceceace01c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:28.289Z","lastSeenAt":"2026-04-23T00:31:09.948Z"}],"details":{"listingId":"09bb24f2-dcd1-4ec0-af0a-bdceceace01c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/15 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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/15"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/orders/15"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding, validation, and conversion without subscription commitments"],"bestFor":["Agents or developers wanting zero-signup, pay-as-you-go API access","x402-compatible clients on the Base network looking for low-cost endpoints","Prototyping and low-volume use cases where per-request pricing is preferable to subscriptions"],"notFor":["High-volume production workloads needing SLAs, guaranteed uptime, or detailed documentation","Users without USDC on Base or without x402-compatible payment infrastructure"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.537Z"},"updatedAt":"2026-04-23T00:31:09.948Z"}}