{"id":"71f0fa5d-7631-40b4-b1eb-98ed02fbc33a","shortId":"hCk8ge","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","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/169` 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 endpoint returns application/json.\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 examples available. It is unclear what specific functionality the `/api/v1/charges/169` path provides beyond the generic \"Premium API Access\" label, as the site's catalog lists many different endpoints but this particular path does not appear among them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["premium API","paid API access","x402 API","USDC API","Base network API","micropayment API","pay-per-call API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found","The specific endpoint /api/v1/charges/169 does not appear in the site's listed API catalog, making its purpose unclear","No request or response examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/169","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/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","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, no examples, and the specific purpose of /api/v1/charges/169 is unclear. This is effectively a stub 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'/api/v1/charges/169':111,209 '/docs':172 '/pricing':173 '/readme':176 '0.02':10,24,89,144 '000':133 '0x8335':138 '20':132 '2913':139 '300':160 '6':148 'Base network API' 'USDC API' 'accept':122 'access':6,20,36,116,217 'advertis':128 'ai/ml':60 'among':235 'analysi':63 'analyt':59 'api':5,19,35,56,99,115,216 'appear':234 'application/json':166 'avail':201 'base':8,22,43,96,134,141 'base-network' 'behind':37 'beyond':212 'broad':49 'call':55 'catalog':50,223 'challeng':120,127 'classif':65 'commit':106 'connect':182 'content':188 'convers':82 'data':58 'decim':149 'differ':226 'document':167,197 'embed':66 'endpoint':30,85,110,164,227 'equal':143 'estim':76 'exact':156 'exampl':200 'exchang':71 'extrem':169 'feed':70 'financ':67 'function':207 'gas':75 'gate':3,17 'generat':83 'generic':214 'geocod':80 'given':145 'host':47 'http':123 'http-post' 'infer':61 'infrastructur':78 'json-response' 'key':100 'label':113,218 'limit':103 'list':224 'lowpaymentfee.com':32 'made':152 'mani':225 'maxamountrequir':130 'micropayment API' 'network':44 'openapi':192 'page':177 'paid API access' 'particular':230 'path':210,231 'pay':9,23,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'payment':150 'paywal':40 'per':11,25,54,90 'post':124 'premium':4,18,34,114,215 'premium API' 'price':69,87 'prompt':184 'provid':33,211 'quot':74 'rate':72,102 'render':179 'request':12,26,91,125 'request/response':195 'requir':107 'return':165 'schema':196 'scheme':157 'second':161 'sentiment':62 'settl':92 'site':46,221 'span':57 'spars':170 'spec':193 'specif':109,206 'summar':64 'timeout':162 'token':73 'unclear':204 'unit':135 'usdc':14,28,94,137,146 'usdc-settlement' 'util':79 'valid':81 'via':153 'wallet':183 'web3':68 'x402':2,16,39,119,155 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"619fe80b-69dc-4285-887a-a496a5fd92e9","listingId":"71f0fa5d-7631-40b4-b1eb-98ed02fbc33a","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/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:22.469Z"}],"sources":[{"listingId":"71f0fa5d-7631-40b4-b1eb-98ed02fbc33a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/169","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:22.469Z","lastSeenAt":"2026-04-22T13:30:57.671Z"}],"details":{"listingId":"71f0fa5d-7631-40b4-b1eb-98ed02fbc33a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/169 \\\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":"The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/169"}],"useCases":["Accessing pay-per-call API services without API key registration","Making micropayment-gated API requests settled in USDC on Base","Agent-driven programmatic access to premium endpoints via x402 protocol"],"bestFor":["Developers wanting keyless, 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 needing detailed API documentation or schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.617Z"},"updatedAt":"2026-04-22T13:30:57.671Z"}}