{"id":"c111d2aa-0650-4062-9d9c-b7a3a240fede","shortId":"kH7QJv","kind":"x402","title":"x402-gated \"Premium API Access\" endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated \"Premium API Access\" endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across several categories: data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific resource at `/api/v1/charges/257` is labeled \"Premium API Access\" and is gated via the x402 protocol on the Base network. Payment is made in USDC (contract 0x8335…2913) at a cost of $0.02 per call (20,000 base units with 6 decimals). The endpoint accepts POST requests and returns application/json.\n\nThe platform advertises a simple pricing model: $0.02 per request with no API keys, no rate limits, no minimums, and instant access. However, the specific functionality behind the `/api/v1/charges/257` path is not documented — the name \"Premium API Access\" is generic and no input/output schema beyond the x402 challenge envelope is provided. The broader site lists endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Without documentation or example responses for this particular endpoint, it is unclear what data or service it returns.\n\nThe x402 challenge was successfully captured (HTTP 402 with valid accepts array), confirming the endpoint is live. The root landing page also returns HTTP 200. However, the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive documentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method"],"categories":["api-gateway","misc"],"synonyms":["premium api","lowpaymentfee","x402 api","pay-per-call api","base network api","usdc micropayment api","low fee api"],"warnings":["No documentation available — docs, pricing, and README pages all render only 'Connect wallet'","The specific functionality of /api/v1/charges/257 ('Premium API Access') is undocumented and unclear","No input or output schema provided beyond the x402 challenge envelope","The broader site lists many endpoint categories but none map to this specific path"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/257","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/257","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does. No input schema, no output schema, no example responses, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The label 'Premium API Access' is entirely 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'0.02':11,26,93,118,196 '000':97 '0x8335':87 '20':96 '200':241 '2913':88 '402':224 '6':101 'accept':105,227 'access':6,21,69,132,148 'across':47 'advertis':113 'ai':52 'also':238 'analysi':174 'analyt':51 'api':5,20,46,68,123,147,245 'application/json':110 'array':228 'base':9,24,79,98 'base network api' 'behind':137 'beyond':155 'broader':39,163 'call':95 'captur':222 'categori':49 'challeng':158,219 'classif':177 'confirm':229 'connect':254 'contract':86 'convers':189 'cost':91 'data':50,170,212 'decim':102 'doc':244 'document':143,200,260 'embed':178 'endpoint':7,22,32,104,166,207,231 'envelop':159 'estim':186 'exampl':202 'exchang':181 'export':171 'feed':180 'financ':55 'function':136 'gas':185 'gate':3,18,72 'generat':191 'generic':150 'geocod':187 'howev':133,242 'http':223,240 'infrastructur':58 'input/output':153 'insight':172 'instant':131 'json-response' 'key':124 'label':66 'land':236 'learn':54 'limit':127 'list':165 'live':233 'low fee api' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':53 'made':83 'metric':168 'minimum':129 'model':117 'name':145 'network':80 'offer':41 'page':237,249 'part':36 'particular':206 'path':140 'pay':10,25,43 'pay-per-call api' 'pay-per-request':42 'payment':81 'per':12,27,44,94,119 'platform':40,112 'point':198 'post':106 'post-method' 'premium':4,19,67,146 'premium api' 'price':116,179,197,246 'prompt':256 'protocol':76 'provid':161 'quot':184 'rate':126,182 'readm':248 'render':251 'report':169 'request':13,28,45,107,120 'resourc':62 'respons':203 'return':109,216,239 'root':235 'schema':154 'sentiment':173 'servic':214 'sever':48 'simpl':115 'site':164 'specif':61,135 'substant':259 'success':221 'summar':176 'text':175 'token':183 'unclear':210 'unit':99 'usdc':15,30,85 'usdc micropayment api' 'usdc-base' 'util':59 'valid':188,226 'via':73 'wallet':255 'web3':56 'without':199 'x402':2,17,75,157,218 'x402 api' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"2dcd48cc-3c70-47ca-883b-b2cb217aa1ba","listingId":"c111d2aa-0650-4062-9d9c-b7a3a240fede","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/257","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:50.214Z"}],"sources":[{"listingId":"c111d2aa-0650-4062-9d9c-b7a3a240fede","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/257","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:50.214Z","lastSeenAt":"2026-04-22T09:01:01.017Z"}],"details":{"listingId":"c111d2aa-0650-4062-9d9c-b7a3a240fede","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/257 \\\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":"Endpoint returns HTTP 402 with x402 challenge on POST, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/charges/257"},{"claim":"Price is $0.02 per request, no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/charges/257"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Programmatic agent-driven API consumption settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 pay-per-request patterns","Agents that need keyless, on-demand API access on Base","Low-cost experimentation with crypto-settled API calls"],"notFor":["Users who need documented input/output schemas before integrating","High-throughput production workloads requiring SLA guarantees","Anyone needing non-crypto payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.309Z"},"updatedAt":"2026-04-22T09:01:01.017Z"}}