{"id":"633e763d-7ba4-41d0-b0e8-b6e8ff6a6e48","shortId":"5vapUe","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/transactions/257` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: 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.\n\nThis particular endpoint (`/api/v1/transactions/257`) is confirmed live, returning a valid x402 challenge via POST. However, there is no documentation describing what this specific endpoint returns — the crawled docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema or example responses, the actual functionality of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no substantive content.","The specific functionality of /api/v1/transactions/257 ('Premium API Access') is not described anywhere in the crawled material.","No OpenAPI schema or example request/response is available.","The platform lists many endpoint categories (AI, analytics, finance, infrastructure) but none have documented schemas or verifiable functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/257","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/transactions/257","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no example request/response, and the actual functionality of '/api/v1/transactions/257' is entirely undescribed. The docs, pricing, and README pages all render only 'Connect wallet' with no content. This is effectively a stub 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92 'across':108 'actual':203 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85 'attach':95 'base':8,23,51,73 'broader':104 'call':4,19,80 'categori':110 'challeng':67,163 'classif':125 'confirm':157 'connect':188 'content':194 'convers':142 'crawl':178 'crypto-paid API' 'data':111,115 'describ':171 'doc':179 'document':170 'embed':126 'endpoint':55,107,145,154,175,207 'estim':136 'exampl':200 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':204 'gas':135 'generat':143 'geocod':140 'header':99 'howev':166 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'label':59 'learn':120 'limit':89 'list':147 'live':158 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':197 'page':183 'particular':153 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,150 'platform':6,21,39,82,105 'post':165 'post-method' 'premium':60 'price':129,180 'prompt':190 'protocol':44 'quot':134 'rate':88,132 'readm':182 'remain':208 'render':185 'report':114 'request':37,68,102,151 'respons':201 'return':64,159,176 'schema':198 'sentiment':121 'simpli':94 'specif':54,174 'substant':193 'summar':124 'text':123 'token':133 'unclear':209 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141,161 'via':10,25,164 'wallet':189 'web3':128 'without':195 'x402':11,26,43,97,162 'x402 API' 'x402-payment'","prices":[{"id":"9e61a262-b9e0-4ad3-9a29-4859be829789","listingId":"633e763d-7ba4-41d0-b0e8-b6e8ff6a6e48","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/transactions/257","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:46.286Z"}],"sources":[{"listingId":"633e763d-7ba4-41d0-b0e8-b6e8ff6a6e48","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/257","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:46.286Z","lastSeenAt":"2026-04-23T16:07:45.057Z"}],"details":{"listingId":"633e763d-7ba4-41d0-b0e8-b6e8ff6a6e48","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/257 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/257"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/257"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want to avoid API key management and subscriptions","AI agents that can attach x402 payment headers autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.319Z"},"updatedAt":"2026-04-23T16:07:45.057Z"}}