{"id":"8916f409-0e5c-47db-9066-08684e4a7132","shortId":"Pd3xxa","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/transactions/259` 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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 the same $0.02/request price point.\n\nThis particular endpoint (`/api/v1/transactions/259`) is labeled generically as \"Premium API Access\" and does not appear in the site's public API catalog, so its exact functionality is unclear. It accepts POST requests and returns application/json. The payment settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. No OpenAPI schema, detailed documentation, or example responses were found during crawling — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["api-platform","crypto"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The exact functionality of /api/v1/transactions/259 is unknown — it is not listed in the site's public API catalog","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content","No OpenAPI spec, request schema, or response examples are available","The endpoint path includes a numeric ID (259) which may be ephemeral or user-specific"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/259","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/259","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/transactions/259 is undocumented. No OpenAPI schema, no example requests/responses, and all documentation pages render only a wallet-connect prompt. The listing is essentially a stub with verified 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'/request':13,28,156 '0.02':12,27,78,155 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':199 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':202 '20':71 '402':66 '402 payment api' 'accept':46,188 'access':62,92,169 'across':112 'address':198 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,168,179,221 'appear':173 'application/json':193 'attach':95 'base':8,23,51,73,204 'base network api' 'broader':108 'call':4,19,80 'caller':93 'catalog':180 'categori':114 'challeng':67 'classif':129 'connect':227 'convers':146 'crawl':216 'data':115,119 'detail':208 'doc':218 'document':209 'embed':130 'endpoint':55,111,149,161 'estim':140 'exact':183 'exampl':211 'exchang':135 'export':120 'feed':134 'financ':131 'found':214 'four':113 'function':184 'gas':139 'generat':147 'generic':165 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':164 'learn':124 'limit':89 'list':58,151 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'openapi':206 'page':222 'particular':160 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105,195 'per':3,18,36,79 'platform':6,21,39,82,109 'point':158 'post':189 'post-method' 'premium':60,167 'price':133,157,219 'prompt':229 'proof':106 'protocol':44 'public':178 'quot':138 'rate':88,136 'render':224 'report':118 'request':37,68,190 'respons':212 'return':64,192 'schema':207 'sentiment':125 'settl':196 'simpli':94 'site':176 'specif':54 'summar':128 'text':127 'token':137 'unclear':186 'unit':74 'usdc':15,30,47,76,201 'usdc api' 'usdc-base' 'use':41,200 'util':143 'valid':103,145 'via':10,25 'wallet':228 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 api' 'x402-payment'","prices":[{"id":"4cc332f3-0e8e-4add-892b-5c92c7a30466","listingId":"8916f409-0e5c-47db-9066-08684e4a7132","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/259","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:39.722Z"}],"sources":[{"listingId":"8916f409-0e5c-47db-9066-08684e4a7132","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/259","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:39.722Z","lastSeenAt":"2026-04-23T16:07:44.791Z"}],"details":{"listingId":"8916f409-0e5c-47db-9066-08684e4a7132","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/259 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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","source_url":"https://lowpaymentfee.com/api/v1/transactions/259"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/259"},{"claim":"The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Making on-demand API calls without signing up for an account or managing API keys","Programmatic agents paying per-request with USDC on Base via x402","Accessing premium data or services with crypto micropayments"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.598Z"},"updatedAt":"2026-04-23T16:07:44.791Z"}}