{"id":"51afe217-0b2a-4fd0-a83d-63b9feff81e3","shortId":"wxbrwF","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 `/api/v1/transfers/25` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API categories including 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 settle via USDC on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/25` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API gateway"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/transfers/25 is unknown — 'Premium API Access' is not descriptive","Cannot verify what data or functionality any of the advertised endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/25","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/transfers/25","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, confirming it accepts USDC on Base at $0.02/request. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the endpoint actually does beyond the generic 'Premium API Access' label. The listing is essentially a 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'/request':13,28 '0.02':12,27,65,144 '000':69 '20':68 '402':202 '6':75 'Base network API' 'USDC API' 'accept':46 'access':62,221 'account':80 'actual':193 'advertis':99 'ai':111 'analysi':115 'analyt':105 'api':5,20,38,61,78,101,161,220 'attach':88 'base':8,23,51,70,154 'base-network' 'beyond':216 'broader':97 'call':4,19,67 'caller':86 'categori':102 'challeng':203 'classif':118 'connect':170 'content':176 'convers':135 'cost':64 'crypto API gateway' 'data':104,108,211 'decim':76 'descript':187 'doc':160 'document':155,206 'embed':119 'endpoint':55,138,192,196 'estim':129 'exampl':184 'exchang':124 'export':109 'extrem':157 'feed':123 'financ':120 'function':213 'gas':128 'generat':136 'generic':218 'geocod':133 'header':92 'http-post' 'includ':103 'infrastructur':131 'insight':110 'key':79 'label':222 'learn':113 'limit':83 'list':58,140 'live':198 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'metric':106 'micropayment API' 'multipl':100 'network':9,24,52 'no-api-key' 'openapi':180 'page':165 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,91 'per':3,18,36,66,145 'platform':6,21,39,98 'point':148 'premium':60,219 'price':122,147,162 'prompt':172 'protocol':44 'provid':215 'quot':127 'rate':82,125 'readm':164 'render':167 'report':107 'request':37,95,146 'request/response':183 'requir':85 'return':194,199 'schema':181 'sentiment':114 'settl':150 'simpli':87 'spars':158 'specif':54 'summar':117 'text':116 'token':126 'unclear':209 'unit':71 'usdc':15,30,47,73,152 'usdc-settlement' 'use':41 'util':132 'valid':134,201 'via':10,25,151 'wallet':171 'web3':121 'without':205 'x402':11,26,43,90 'x402 API' 'x402-payment'","prices":[{"id":"487933f5-f627-49e0-8c99-ce06513ba51e","listingId":"51afe217-0b2a-4fd0-a83d-63b9feff81e3","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/transfers/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:48.805Z"}],"sources":[{"listingId":"51afe217-0b2a-4fd0-a83d-63b9feff81e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:48.805Z","lastSeenAt":"2026-04-22T15:02:25.259Z"}],"details":{"listingId":"51afe217-0b2a-4fd0-a83d-63b9feff81e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/25 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/25"},{"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 advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/25"}],"useCases":["Programmatic access to various data, AI, finance, and utility APIs without account signup","Agent-driven workflows that need instant, keyless API access with per-call crypto payments","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers wanting no-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.008Z"},"updatedAt":"2026-04-22T15:02:25.259Z"}}