{"id":"10423a4c-7dcd-412a-9473-994e91a56684","shortId":"eLZhCE","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/12` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is settled on-chain with no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of endpoints: 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 the same $0.02 per request price point and use the x402 exact-payment scheme on Base.\n\nDocumentation 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 content. The specific behavior and response format of `/api/v1/orders/12` (\"Premium API Access\") is unclear from the available material; the name suggests order retrieval but no schema or sample output is provided.","tags":[],"capabilities":["x402-payment","pay-per-request","base-network","usdc-settlement","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["x402 API","pay per call API","micropayment API","Base USDC API","lowpaymentfee","crypto API access","on-chain payment API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content","The specific endpoint /api/v1/orders/12 ('Premium API Access') has an unclear purpose — 'orders/12' suggests a hardcoded resource ID rather than a general-purpose API","No information on uptime, SLAs, or rate limits beyond the marketing claim of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/12","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response documentation, no usage examples, and the docs pages are empty beyond a wallet-connect prompt. The purpose of this specific endpoint ('orders/12') is 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'/call':19,38 '0.02':18,37,89,157 '000':78 '0x8335':83 '20':77 '2913':84 '6':87 'Base USDC API' 'access':50,69,223 'advertis':112 'ai':12,31,124 'ai-inference' 'analysi':128 'analyt':118 'api':5,24,48,68,100,178,222 'avail':208,228 'base':8,27,58,79,86,171 'base-network' 'behavior':215 'broader':110 'call':91 'categori':114 'chain':97 'classif':131 'classification' 'collect':42 'connect':187 'content':212 'convers':148 'crawl':211 'crypto API access' 'data':11,30,117,121 'data-analytics' 'decim':88 'detail':194 'doc':177 'document':172,203 'embed':132 'embeddings' 'endpoint':16,35,49,62,116,151 'estim':142 'exact':167 'exact-pay':166 'exampl':207 'exchang':137 'export':122 'extrem':174 'feed':136 'financ':13,32,133 'finance-data' 'format':218 'four':113 'gas':141 'generat':149 'geocod':146 'geocoding' 'infrastructur':144 'insight':123 'key':101 'label':66 'learn':126 'limit':104 'list':153 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':125 'materi':229 'metric':119 'micropayment API' 'name':231 'network':59 'no-api-key' 'offer':40 'on-chain':95 'on-chain payment API' 'openapi':198 'order':233 'output':240 'page':182 'pay':2,21,45 'pay per call API' 'pay-per-request':1,20,44 'payment':54,73,92,168 'per':3,22,46,90,158 'platform':111 'point':161 'premium':67,221 'price':135,160,179 'prompt':189 'protocol':55 'provid':242 'quot':140 'rate':103,138 'readm':181 'render':184 'report':120 'request':4,23,47,159 'request/response':201 'requir':71,108 'respons':217 'retriev':234 'sampl':239 'schema':202,237 'scheme':169 'sentiment':127 'sentiment-analysis' 'settl':94 'spars':175 'spec':199 'specif':61,214 'subscript':107 'suggest':232 'suit':6,25 'summar':130 'technic':193 'text':129 'text-summarization' 'token':139 'unclear':225 'unit':80 'usag':206 'usdc':82 'usdc-settlement' 'use':163 'util':15,34,145 'valid':147 'via':9,28,51 'wallet':188 'web3':134 'x402':10,29,53,165 'x402 API' 'x402-payment'","prices":[{"id":"7fcb7706-94cb-4a4f-b222-42aad4635c2d","listingId":"10423a4c-7dcd-412a-9473-994e91a56684","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:28.907Z"}],"sources":[{"listingId":"10423a4c-7dcd-412a-9473-994e91a56684","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:28.907Z","lastSeenAt":"2026-04-23T18:01:26.064Z"}],"details":{"listingId":"10423a4c-7dcd-412a-9473-994e91a56684","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/orders/12 \\\n  -H 'Content-Type: application/json'\n# Response: 402 with accepts[] containing USDC payment details on Base.\n# After attaching X-PAYMENT header with signed payment, you receive the resource.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/orders/12","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/12"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-request basis","Running data analytics queries and exporting data with pay-as-you-go pricing","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents and developers who want zero-signup, pay-per-call API access","Crypto-native applications that can settle payments in USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible wallet or USDC holdings","Applications requiring well-documented, schema-validated API contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.61Z"},"updatedAt":"2026-04-23T18:01:26.064Z"}}