{"id":"61abf294-b220-456f-a5e6-3a437aefe723","shortId":"NVCEXE","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 an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no subscriptions required. The x402 protocol handles payment inline: callers attach a cryptographic payment header and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transactions/348` is listed as \"Premium API Access\" and returns `application/json`. Based on the x402 challenge, it accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality behind the `/api/v1/transactions/348` path is unclear — the name \"Premium API Access\" is generic and does not describe what data or service is returned.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payment","402 payment required"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content.","No OpenAPI or schema definition found for any endpoint.","The purpose of /api/v1/transactions/348 ('Premium API Access') is vague and undocumented — it is unclear what data or service this endpoint provides.","The broader platform lists many endpoints (AI, analytics, finance, utils) but none have documented request/response formats."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/348","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/348","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/transactions/348 is entirely unclear. The docs pages are empty beyond a wallet-connect 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'/api/v1/transactions/348':101,218 '/docs':179 '/pricing':180 '/readme':183 '/request':13,28 '0.02':12,27,59,131,171 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '20':125 '402 payment required' '6':136 'Base network API' 'USDC micropayment API' 'accept':117 'access':107,226 'addit':150 'address':142 'advertis':149 'ai/ml':49 'analysi':154 'analyt':48 'api':5,20,37,71,106,225 'application/json':110 'attach':87 'avail':209 'base':8,23,67,111,127,145 'behind':216 'broad':42 'broader':147 'call':4,19,139 'caller':86 'catalog':43 'challeng':115 'charg':121 'classif':157 'connect':189 'content':195 'cost':58 'crawl':212 'crypto API payment' 'cryptograph':89 'data':47,52,234 'decim':137 'describ':232 'document':174,204 'embed':158 'enabl':36 'endpoint':45,57,99,151 'everi':56 'exact':214 'exampl':208 'exchang':161 'extrem':176 'feed':160 'finance/web3':51 'function':215 'generic':228 'geocod':163 'handl':83 'header':91 'immedi':96 'infer':50 'inlin':85 'json-response' 'key':72 'limit':75 'list':103 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':123 'name':223 'network':9,24,68 'no-api-key' 'offer':40 'openapi':199 'page':184 'paid':62 'path':219 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':84,90 'per':3,18,60,138 'platform':6,21,38,148 'point':173 'post':118 'post-method' 'premium':105,224 'price':159,172 'prompt':191 'protocol':82 'rate':74,162 'receiv':93 'render':186 'request':61,119 'request/response':202 'requir':79 'respons':95 'return':109,238 'schema':203 'sentiment':153 'servic':55,236 'settl':140 'sinc':133 'span':46 'spars':177 'spec':200 'specif':98 'subscript':78 'summar':156 'text':155 'unclear':221 'unit':128 'usag':207 'usd':132 'usdc':15,30,64,130,134 'usdc-base-network' 'use':135 'util':54 'valid':164 'via':10,25 'wallet':190 'x402':11,26,35,81,114 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a553099b-6c77-49bf-aae9-d5477f4ac57d","listingId":"61abf294-b220-456f-a5e6-3a437aefe723","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/348","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:18.630Z"}],"sources":[{"listingId":"61abf294-b220-456f-a5e6-3a437aefe723","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/348","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:18.630Z","lastSeenAt":"2026-04-23T11:31:27.664Z"}],"details":{"listingId":"61abf294-b220-456f-a5e6-3a437aefe723","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/348 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/348"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/348"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing on-demand API services without subscription or API key management","Making micropayment-gated API calls settled in USDC on Base","Integrating pay-per-use endpoints into agent workflows via x402 protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring non-crypto payment methods","High-volume use cases where a flat subscription would be cheaper"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.262Z"},"updatedAt":"2026-04-23T11:31:27.664Z"}}