{"id":"e12604c0-d8b4-4acc-97b7-4be9af9a5abf","shortId":"NSfu8Q","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/310` is listed as \"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 uniformly priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/transactions/310`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that label. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional documentation or schema details. Without further documentation, the exact input/output behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The exact functionality of /api/v1/transactions/310 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec, request schema, or response schema is available.","The platform lists many endpoints on its landing page but none have documented input/output contracts."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/310","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/310","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 request/response examples, and the actual functionality behind \"Premium API Access\" is entirely opaque. The docs, pricing, API, and README pages all render only a wallet-connect prompt with no useful 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'/request':13,28 '0.02':12,27,79,151 '000':73 '20':72 '402':67 'Base network API' 'USDC micropayment API' 'accept':46 'access':63,93,162 'across':109 'actual':165 'addit':190 'advertis':84 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,62,86,161,177 'attach':96 'base':8,23,51,74 'behavior':201 'beyond':170 'broader':105 'call':4,19,81 'categori':111 'challeng':68 'classif':126 'connect':185 'convers':143 'crawl':174 'crypto-paid API' 'data':112,116 'detail':194 'doc':175 'document':169,191,197 'embed':127 'endpoint':55,108,146,156,204 'estim':137 'exact':199 'exchang':132 'export':117 'feed':131 'financ':128 'four':110 'function':166 'gas':136 'generat':144 'geocod':141 'header':100 'http-post' 'i.e':78 'infrastructur':139 'input/output':200 'insight':118 'instant':92 'json-response' 'key':87 'label':159,172 'learn':121 'limit':90 'list':59 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'metric':114 'network':9,24,52 'no-api-key' 'offer':107 'page':180 'particular':155 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99 'per':3,18,36,80,152 'platform':6,21,39,83,106 'premium':61,160 'price':130,149,176 'prompt':187 'protocol':44 'quot':135 'rate':89,133 'readm':179 'remain':205 'report':115 'request':37,69,103,153 'return':65,182 'schema':193 'sentiment':122 'simpli':95 'specif':54 'summar':125 'text':124 'token':134 'unclear':206 'uniform':148 'unit':75 'usdc':15,30,47,77 'usdc-base-network' 'use':41 'util':140 'valid':142 'via':10,25 'wallet':186 'web3':129 'without':195 'x402':11,26,43,98 'x402 API' 'x402-payment'","prices":[{"id":"d3247f66-d779-410c-94e5-82d54819bac9","listingId":"e12604c0-d8b4-4acc-97b7-4be9af9a5abf","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/310","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:56.182Z"}],"sources":[{"listingId":"e12604c0-d8b4-4acc-97b7-4be9af9a5abf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/310","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:56.182Z","lastSeenAt":"2026-04-23T13:01:59.091Z"}],"details":{"listingId":"e12604c0-d8b4-4acc-97b7-4be9af9a5abf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/310 \\\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/310"},{"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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.","source_url":"https://lowpaymentfee.com/api/v1/transactions/310"}],"useCases":["Accessing premium data or transaction information via a single USDC micropayment","Integrating pay-per-use API calls into agent workflows without managing API keys","Programmatic access to platform services settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.378Z"},"updatedAt":"2026-04-23T13:01:59.091Z"}}