{"id":"d60a4bea-227e-4543-838b-05a7ca28ff3d","shortId":"wANzPy","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/charges/145` is labeled \"Premium API Access\" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" payment scheme. The endpoint accepts HTTP POST requests and returns `application/json` responses.\n\nNote that while the landing page lists many API paths across multiple categories, the specific functionality behind `/api/v1/charges/145` is not documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl — the docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt. This makes it difficult to determine exactly what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Docs, pricing, API, and README pages all render only 'Connect wallet' with no accessible content","The specific functionality behind /api/v1/charges/145 ('Premium API Access') is not described anywhere in the crawled material","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/145","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/145","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, and the landing page provides pricing and a catalog overview. However, no OpenAPI schema, request/response examples, or meaningful documentation exists for this specific endpoint. The docs/pricing/API pages are all behind a wallet-connect gate and yielded no content. The exact functionality of /api/v1/charges/145 is 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'/call':13,28 '0.02':12,27,88,133 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '20':127 '6':138 'Base network API' 'USDC micropayment API' 'accept':158 'access':7,22,38,117,192 'across':176 'address':149 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,100,116,174,191,210 'application/json':164 'base':9,24,96,129 'behind':182 'beyond':187 'broad':48 'call':54,141 'catalog':49 'categori':178 'chain':147 'challeng':123 'classif':64 'commit':108 'connect':218 'convers':81 'crawl':206 'crypto-paid API' 'data':57,229 'decim':139 'detail':200 'determin':226 'difficult':224 'doc':208 'document':186,201 'embed':65 'endpoint':32,84,111,157,234 'estim':75 'exact':153,227 'exampl':198 'exchang':70 'feed':69 'financ':66 'found':203 'function':181 'gas':74 'generat':82 'generic':189 'geocod':79 'host':46 'http':159 'http-post' 'infer':60 'infrastructur':77 'json-response' 'key':101 'label':114,193 'land':170 'limit':104 'list':172 'lowpaymentfee' 'lowpaymentfee.com':34 'make':222 'mani':173 'minimum':107 'multipl':177 'network':97 'no-api-key' 'note':166 'on-chain':145 'openapi':195 'page':171,213 'particular':233 'path':175 'pay':2,17,52 'pay-per-cal':51 'pay-per-call API' 'pay-per-request':1,16 'payabl':91 'payment':42,142,154 'per':3,18,53,89,140 'post':160 'premium':5,20,36,115,190 'premium API access' 'price':68,86,209 'prompt':220 'protocol':43 'provid':35 'quot':73 'rate':71,103 'readm':212 'render':215 'request':4,19,90,124,161 'request/response':197 'respons':165 'return':119,163,235 'schema':196 'scheme':155 'sentiment':61 'servic':231 'settl':144 'sinc':135 'site':45 'span':56 'specif':110,180 'standard':121 'summar':63 'token':72 'unit':130 'usd':134 'usdc':15,30,93,132,136 'usdc-base-network' 'use':137,151 'util':78 'valid':80 'via':10,25,39 'wallet':219 'web3':67 'x402':11,26,41,122 'x402 API' 'x402-payment'","prices":[{"id":"0a29b750-459a-4f20-985a-47ecfbf18493","listingId":"d60a4bea-227e-4543-838b-05a7ca28ff3d","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/145","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:27.806Z"}],"sources":[{"listingId":"d60a4bea-227e-4543-838b-05a7ca28ff3d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/145","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:27.806Z","lastSeenAt":"2026-04-22T13:30:57.909Z"}],"details":{"listingId":"d60a4bea-227e-4543-838b-05a7ca28ff3d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/145 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/145"},{"claim":"Site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/145"}],"useCases":["Programmatic access to paid API services without traditional API key registration","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Accessing data, analytics, AI, or utility endpoints with per-request crypto payments"],"bestFor":["Developers or agents who want keyless, pay-as-you-go API access","x402-compatible clients on the Base network","Low-friction micropayment API consumption at $0.02/request"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request crypto settlement overhead matters","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.337Z"},"updatedAt":"2026-04-22T13:30:57.909Z"}}