{"id":"950b0393-b6be-4e0d-959d-9d75b10bae89","shortId":"VGPpWF","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource at `/api/v1/charges/204` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled entirely through the x402 `X-PAYMENT` header — no API keys, accounts, or rate limits are required.\n\nThe broader lowpaymentfee.com platform advertises a suite of 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. However, the specific endpoint being listed here (`/api/v1/charges/204`) is labeled generically as \"Premium API Access\" and its exact functionality is not documented beyond that label.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. The payment timeout is 300 seconds. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The exact functionality of /api/v1/charges/204 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no substantive content.","No OpenAPI spec or request/response schema is available — callers cannot know what to send or what to expect back.","The broader site lists many endpoints but none have documented input/output contracts."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/204","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/charges/204","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 challenge, but the actual functionality behind 'Premium API Access' is completely undocumented. No OpenAPI spec, no request/response schemas, no examples, and all doc pages are empty ('Connect wallet' only). The listing is effectively a stub with confirmed liveness and 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'/request':13,28 '0.02':12,27,70,147 '000':57 '0x8335':62 '1':189 '20':56 '2913':63 '300':197 '402':186 '6':75 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,164 'account':91 'across':106 'advertis':101 'ai':116 'analysi':120 'analyt':110 'api':6,21,37,89,163,208 'avail':236 'base':9,24,58,66 'beyond':172 'broader':98 'call':4,19 'categori':108 'challeng':184 'charg':53 'classif':123 'connect':217 'content':223 'convers':140 'crawl':239 'crypto-paid endpoint' 'data':109,113 'decim':76 'doc':207 'document':171,199 'embed':124 'endpoint':32,105,143,153,176 'entir':80 'equal':69 'estim':134 'exact':167 'exampl':235 'exchang':129 'export':114 'extrem':204 'feed':128 'financ':125 'four':107 'function':168 'gas':133 'generat':141 'generic':160 'geocod':138 'handl':79 'header':87 'howev':150 'http':185 'infrastructur':136 'insight':115 'key':90 'label':159,174 'learn':118 'limit':94 'list':145,155 'live':178 'lowpaymentfee' 'lowpaymentfee.com':34,99 'machin':117 'materi':240 'metric':111 'network':67 'no-api-key' 'openapi':227 'page':212 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,77,86,194 'per':3,18,71,148 'platform':100 'post':50 'post-endpoint' 'premium':5,20,36,162 'premium API access' 'price':127,209 'prompt':219 'protocol':43,192 'provid':35 'quot':132 'rate':93,130 'readm':211 'render':214 'report':112 'request':51,72,149 'request/response':230 'requir':96 'resourc':46 'return':180 'schema':231 'second':198 'sentiment':119 'site':202 'spec':228 'specif':45,152 'substant':222 'suit':103 'summar':122 'text':121 'thin':205 'timeout':195 'token':131 'unit':59 'usag':234 'usdc':15,30,61,73 'usdc-base' 'use':74 'util':137 'valid':139,182 'version':188 'via':10,25,39 'wallet':218 'web3':126 'x':85 'x-payment':84 'x402':11,26,41,83,183 'x402 API' 'x402-payment'","prices":[{"id":"546a3aab-13b9-4cec-b7e0-83fc0fe1bbf2","listingId":"950b0393-b6be-4e0d-959d-9d75b10bae89","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/charges/204","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:35.716Z"}],"sources":[{"listingId":"950b0393-b6be-4e0d-959d-9d75b10bae89","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/204","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:35.716Z","lastSeenAt":"2026-04-24T03:32:08.000Z"}],"details":{"listingId":"950b0393-b6be-4e0d-959d-9d75b10bae89","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/204 \\\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":"Endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/204"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/204"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API services without creating an account or managing API keys","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto payment"],"bestFor":["Developers who want zero-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 purchasing","Anyone without a Base-compatible wallet or USDC holdings","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.922Z"},"updatedAt":"2026-04-24T03:32:08.000Z"}}