{"id":"4f3b4e35-32fd-4bb4-bc95-48ba4ca6769d","shortId":"zpnZBF","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC at $0.02/request.","tagline":"x402-gated premium API access on Base, paid per-call in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. 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, settled in USDC on Base with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/97` is labeled \"Premium API Access\" in the x402 challenge and accepts HTTP POST requests. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The response MIME type is application/json.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 examples available. It is unclear what specific data or functionality the `/api/v1/charges/97` endpoint returns, as the site's landing page only describes the broader catalog without mapping charge IDs to specific services.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","json-response","http-post"],"categories":["api-gateway","pay-per-call"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for this endpoint","The specific functionality of /api/v1/charges/97 ('Premium API Access') is undefined — it does not map to any named service in the site catalog","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/97","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/97","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 documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no clarity on what '/api/v1/charges/97' specifically returns. The listing is effectively a stub with confirmed liveness and 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'/api/v1/charges/97':117,219 '/docs':180 '/pricing':182 '/readme':184 '/request':17,34 '0.02':16,33,95,150 '000':139 '0x8335':144 '20':138 '2913':145 '300':166 '6':154 'Base network API' 'USDC pay-per-call' 'accept':128 'access':6,23,42,122 'advertis':134 'ai/ml':66 'analysi':69 'analyt':65 'api':5,22,41,62,105,121 'application/json':174 'avail':209 'base':8,25,49,102,140,147 'base-network' 'behind':43 'broad':55 'broader':231 'call':12,29,61 'catalog':56,232 'challeng':126,133 'charg':235 'classif':71 'commit':112 'connect':190 'content':196 'convers':88 'crypto-paid API' 'data':64,215 'decim':155 'describ':229 'document':175,205 'embed':72 'endpoint':36,91,116,220 'equal':149 'estim':82 'exact':162 'exampl':208 'exchang':77 'extrem':177 'feed':76 'financ':73 'function':217 'gas':81 'gate':3,20 'generat':89 'geocod':86 'given':151 'host':53 'http':129 'http-post' 'id':236 'infer':67 'infrastructur':84 'json-response' 'key':106 'label':119 'land':226 'limit':109 'lowpaymentfee' 'lowpaymentfee.com':38 'made':158 'map':234 'maxamountrequir':136 'micropayment API' 'mime':171 'network':50 'openapi':200 'page':185,227 'paid':9,26 'pay':59 'pay-per-cal':58 'payment':156 'paywal':46 'per':11,28,60,96 'per-cal':10,27 'per-call-pricing' 'post':130 'premium':4,21,40,120 'premium API access' 'price':75,93 'prompt':192 'provid':39 'quot':80 'rate':78,108 'render':187 'request':97,131 'request/response':203 'requir':113 'respons':170 'return':221 'schema':204 'scheme':163 'second':167 'sentiment':68 'servic':239 'settl':98 'site':52,224 'span':63 'spars':178 'spec':201 'specif':115,214,238 'summar':70 'timeout':168 'token':79 'type':172 'unclear':212 'unit':141 'usdc':14,31,100,143,152 'usdc-settlement' 'util':85 'valid':87 'via':159 'wallet':191 'web3':74 'without':233 'x402':2,19,45,125,161 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"ac523289-4b4f-4535-8393-1d0f7dca0270","listingId":"4f3b4e35-32fd-4bb4-bc95-48ba4ca6769d","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:36.830Z"}],"sources":[{"listingId":"4f3b4e35-32fd-4bb4-bc95-48ba4ca6769d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:36.830Z","lastSeenAt":"2026-04-23T21:32:04.388Z"}],"details":{"listingId":"4f3b4e35-32fd-4bb4-bc95-48ba4ca6769d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/97 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/97"},{"claim":"All endpoints are 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":"The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/97"}],"useCases":["Accessing pay-per-call API services without API key registration","Making micropayments in USDC on Base for on-demand data or utility endpoints","Integrating x402-compatible agents with low-cost API services"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402 payment capability on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integration","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.988Z"},"updatedAt":"2026-04-23T21:32:04.388Z"}}