{"id":"c3a45f35-986c-4a80-ba5e-785cc1e13fd3","shortId":"daB3MK","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 & 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 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/369` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment to the payTo address. The response MIME type is application/json and the endpoint accepts HTTP POST.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. It is unclear what specific data or functionality the `/api/v1/charges/369` endpoint returns, as the site's landing page lists many different API categories but does not map charge IDs to specific services.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages return only 'Connect wallet' with no technical content","The specific functionality behind /api/v1/charges/369 is not documented — it is unclear what data or service it provides","No usage examples or error handling documentation found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/369","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/369","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific function of /api/v1/charges/369 is unknown. Effectively a stub 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'0.02':10,24,91,143 '000':130 '0x8335':135 '20':129 '2913':136 '6':139 'Base network API' 'USDC micropayment API' 'accept':175 'access':6,20,36,118 'addit':198 'address':165 'advertis':125 'ai':60 'analysi':64 'analyt':59 'api':5,19,35,56,101,117,184,239 'application/json':171 'attach':152 'avail':213 'base':8,22,43,98,131,138 'base-network' 'behind':37 'broad':49 'call':55 'caller':151 'catalog':50 'categori':240 'challeng':122,124 'charg':245 'classif':67 'commit':108 'connect':193 'convers':84 'crawl':216 'crypto-paid API' 'data':58,223 'decim':140 'detail':200 'differ':238 'doc':183 'document':178 'embed':68 'endpoint':30,87,112,174,228 'equal':142 'estim':78 'exact':149 'exampl':212 'exchang':73 'extrem':180 'feed':72 'financ':69 'function':225 'gas':77 'gate':3,17 'generat':85 'geocod':82 'header':157 'host':47 'http':176 'http-post' 'id':246 'infrastructur':80 'json-response' 'key':102 'label':115 'land':234 'learn':62 'limit':105 'list':236 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'mani':237 'map':244 'materi':217 'maxamountrequir':127 'mime':168 'network':44 'no-api-key' 'openapi':204 'page':188,235 'pay':9,23,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'payment':144,156,161 'payto':164 'paywal':40 'per':11,25,54,92 'post':177 'premium':4,18,34,116 'premium API access' 'price':71,89,185 'prompt':195 'provid':33 'quot':76 'rate':74,104 'readm':187 'render':190 'request':12,26,93 'request/response':207 'requir':109 'respons':167 'return':229 'schema':208 'scheme':150 'sentiment':63 'servic':249 'settl':94 'sign':160 'site':46,232 'span':57 'spars':181 'spec':205 'specif':111,222,248 'summar':66 'technic':199 'text':65 'token':75 'type':169 'unclear':220 'unit':132 'usag':211 'usdc':14,28,96,134 'usdc-settlement' 'util':81 'valid':83 'via':146 'wallet':194 'web3':70 'x':155 'x-payment':154 'x402':2,16,39,121,148 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b328c824-6eae-436f-9373-6c88a5969626","listingId":"c3a45f35-986c-4a80-ba5e-785cc1e13fd3","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/369","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:10.889Z"}],"sources":[{"listingId":"c3a45f35-986c-4a80-ba5e-785cc1e13fd3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/369","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:10.889Z","lastSeenAt":"2026-04-24T00:03:23.242Z"}],"details":{"listingId":"c3a45f35-986c-4a80-ba5e-785cc1e13fd3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/369 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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, payTo 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/charges/369"}],"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","Integrating pay-per-use data, AI, or finance endpoints into decentralized applications"],"bestFor":["Developers or agents who want zero-signup, pay-as-you-go API access","Users already holding USDC on Base who want frictionless micropayments","Prototyping or low-volume usage where per-call pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where subscription pricing would be cheaper","Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.358Z"},"updatedAt":"2026-04-24T00:03:23.242Z"}}