{"id":"e120f791-241e-470f-96e5-54dc9db5bbdf","shortId":"VLjh9c","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/64` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises 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 listed endpoints share the same $0.02/request pricing.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/charges/64` endpoint specifically returns. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to know what data or functionality this particular route provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","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 API"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/charges/64 ('Premium API Access') is undefined — it is unclear what data or service it provides","No examples of request bodies or response payloads available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/64","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — /docs, /pricing, /api, and /README all render only a wallet-connect prompt. The specific purpose of /api/v1/charges/64 is unknown beyond its 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'/api/v1/charges/64':56,210 '/docs':178 '/pricing':180 '/readme':182 '/request':13,28,167 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '402':222 '6':92 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,42,61 'across':124 'advertis':122 'ai':134 'amount':79 'analysi':138 'analyt':128 'api':6,21,40,60,95 'attach':106 'base':9,24,50,75,83 'base-network' 'beyond':170 'broader':119 'call':4,19,89 'caller':104 'categori':126 'challeng':224 'classif':141 'collect':34 'commit':101 'confirm':217 'connect':188 'content':194 'contract':71 'convers':158 'crypto-paid API' 'data':127,131,236 'decim':93 'descript':206 'detail':205 'difficult':232 'document':169,229 'embed':142 'endpoint':41,54,123,162,211,215 'equal':86 'estim':152 'exampl':202 'exchang':147 'export':132 'extrem':175 'feed':146 'financ':143 'four':125 'function':238 'gas':151 'generat':159 'geocod':156 'header':111 'host':32 'infrastructur':154 'insight':133 'key':96 'know':234 'label':58 'lack':227 'land':172 'learn':136 'limit':98 'list':161 'live':218 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'make':230 'maximum':78 'metric':129 'network':51 'no-api-key' 'openapi':198 'page':173,183 'particular':240 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,110,116 'per':3,18,38,88 'platform':121 'post':64 'post-endpoint' 'premium':5,20,59 'premium API access' 'price':145,168 'prompt':190 'proof':117 'proper':221 'protocol':47 'provid':242 'quot':150 'rate':97,148 'report':130 'request':39,65 'request/response':201 'requir':103 'return':185,213,219 'rout':241 'schema':199 'sentiment':137 'settl':68 'share':163 'simpli':105 'spars':176 'specif':53,212 'substant':193 'summar':140 'text':139 'token':149 'unit':84 'upfront':100 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25,43 'wallet':189 'web3':144 'x':109 'x-payment':108 'x402':11,26,45,115,223 'x402 API' 'x402-payment'","prices":[{"id":"0f04b3d2-3aeb-4664-b5f1-b04f1db8fbf1","listingId":"e120f791-241e-470f-96e5-54dc9db5bbdf","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:37.430Z"}],"sources":[{"listingId":"e120f791-241e-470f-96e5-54dc9db5bbdf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:37.430Z","lastSeenAt":"2026-04-23T21:32:04.386Z"}],"details":{"listingId":"e120f791-241e-470f-96e5-54dc9db5bbdf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/64 \\\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":"Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/64"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/64"},{"claim":"All listed endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API data without subscription or API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integration","AI agents that need keyless, pay-per-use API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.988Z"},"updatedAt":"2026-04-23T21:32:04.386Z"}}