{"id":"8893f65e-e41c-4803-a946-8f8b7dcf8dff","shortId":"DkXKh9","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 endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint being listed here (`/api/v1/orders/10`) is described as \"Premium API Access\" and returns `application/json` via POST. Its on-chain challenge advertises a max amount of 20,000 base units of USDC (0x8335…on Base), which equals $0.02 given USDC's 6 decimals. This is consistent with the site-wide $0.02/request pricing.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. Documentation pages exist but appear to be behind a wallet-connect gate, so detailed request/response schemas are not publicly available. The endpoint is live and returning a valid 402 challenge.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","data","llm","finance","geo"],"synonyms":["pay per request API","x402 API","micropayment API","USDC API","Base network API","lowpaymentfee","crypto API payments","serverless API"],"warnings":["The specific endpoint /api/v1/orders/10 has no documented request body schema or response format — its exact functionality is unclear.","Documentation, pricing, and README pages all appear gated behind a wallet-connect flow, providing no public content.","The site lists many endpoints but none have publicly visible detailed documentation or examples.","The relationship between /api/v1/orders/10 and the other listed endpoints (analytics, AI, finance, utils) is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/10","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/10","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 402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format, and the docs pages are gated behind wallet-connect. The specific purpose of /api/v1/orders/10 ('Premium API Access') is vague and undocumented. Most details are inferred from the landing page 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'/call':13,28 '/request':146 '0.02':12,27,64,131,145,178 '000':121 '0x8335':126 '20':120 '402':210 '6':135 'Base network API' 'USDC API' 'access':104 'account':76 'advertis':115,151 'ai-inference' 'ai/ml':49 'amount':118 'analysi':155 'analyt':48 'api':5,20,37,74,103 'appear':185 'application/json':107 'attach':84 'avail':201 'base':8,23,71,122,128 'behind':188 'broad':42 'broader':149 'caller':82 'catalog':43 'chain':113 'challeng':114,211 'classif':158 'connect':192 'consist':139 'convers':170 'crypto API payments' 'data':47,52,172 'data-analytics' 'decim':136 'describ':100 'detail':195 'document':181 'embed':159 'enabl':36 'endpoint':45,57,94,152,203 'equal':130 'estim':167 'exchang':162 'exist':183 'feed':161 'finance-data' 'finance/web3':51 'gas':166 'gate':193 'generat':173 'geocod':168 'given':132 'header':88 'infer':50 'json-api' 'key':75 'limit':79 'list':96 'live':205 'lowpaymentfee' 'lowpaymentfee.com':31 'max':117 'micropayment API' 'network':9,24,72 'no-api-key' 'no-rate-limit' 'offer':40 'on-chain':111 'page':182 'pay':2,17,60 'pay per request API' 'pay-per-request':1,16,59 'payment':87 'per':3,18,61 'platform':6,21,38,150 'point':180 'post':109 'premium':102 'price':147,160,179 'public':200 'quot':165 'rate':78,163 'request':4,19,62,91 'request/response':196 'requir':81 'return':106,207 'schema':197 'sentiment':154 'serverless API' 'servic':55 'settl':66 'simpli':83 'site':143 'site-wid':142 'span':46 'specif':93 'summar':157 'text':156 'token':164 'unit':123 'usdc':15,30,68,125,133 'usdc-base' 'util':54 'utility-services' 'valid':169,209 'via':10,25,108 'wallet':191 'wallet-connect':190 'web3-data' 'wide':144 'x402':11,26,35,86 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"cfabfe7b-ccb6-4830-a6c6-313c05959d05","listingId":"8893f65e-e41c-4803-a946-8f8b7dcf8dff","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:08.457Z"}],"sources":[{"listingId":"8893f65e-e41c-4803-a946-8f8b7dcf8dff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:08.457Z","lastSeenAt":"2026-04-23T20:31:57.330Z"}],"details":{"listingId":"8893f65e-e41c-4803-a946-8f8b7dcf8dff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/10 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/10"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing analytics metrics and reports without signing up for an account","Running AI inference (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto token quotes and gas estimates","Geocoding addresses or validating data with zero setup"],"bestFor":["Developers who want instant API access without API key management","Agents that can settle payments in USDC on Base via x402","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where bulk/subscription pricing would be cheaper","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.672Z"},"updatedAt":"2026-04-23T20:31:57.330Z"}}