{"id":"f981234e-cef1-4164-8f24-33e616ed605e","shortId":"AvaHnF","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The endpoint is live and returns a standard x402 challenge requiring payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.\n\nThe provider's landing page advertises a broad suite of APIs spanning data & analytics (metrics, reports, data export, insights), 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 priced at $0.02 per request with no API keys, no rate limits, and instant access via x402 on Base.\n\nHowever, this specific endpoint (/api/v1/charges/95) is labeled only as \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages all render as wallet-connect stubs with no meaningful content. There is no OpenAPI schema, no example request/response, and no description of the input or output format beyond the x402 challenge's mimeType of application/json. The endpoint accepts POST requests. Without additional documentation it is unclear what this particular charge endpoint does or how it differs from the other listed APIs.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","json-response","post-method"],"categories":["api","payments"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API"],"warnings":["No documentation available for this specific endpoint — functionality is unknown","No OpenAPI or output schema provided beyond mimeType: application/json","Docs, pricing, and API pages render only as wallet-connect stubs with no content","The endpoint path '/api/v1/charges/95' does not match any of the advertised API routes on the landing page"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/95","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/95","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 there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific functionality of /api/v1/charges/95 is undocumented. The docs/pricing/API pages are empty wallet-connect 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'0.02':82,133 '000':72 '0x8335':60 '20':71 '2913':61 '6':79 'Base network API' 'USDC API access' 'accept':217 'access':6,20,36,145,161 'addit':221 'advertis':90 'ai':104 'amount':66 'analysi':108 'analyt':98 'api':5,19,35,95,138,160,177,240 'application/json':214 'base':8,22,43,63,73,149 'behind':37 'beyond':207 'broad':92 'call':12,26,69 'challeng':54,210 'charg':229 'classif':111 'connect':184 'content':189 'contract':59 'convers':128 'data':97,101,168 'decim':80 'descript':200 'differ':235 'doc':174 'document':165,222 'embed':112 'endpoint':30,46,153,216,230 'equal':81 'estim':122 'exampl':196 'exchang':117 'export':102 'feed':116 'financ':113 'format':206 'function':170 'gas':121 'gate':3,17 'generat':129 'geocod':126 'howev':150 'infrastructur':124 'input':203 'insight':103 'instant':144 'json-response' 'key':139 'label':156 'land':88 'learn':106 'limit':142 'list':239 'live':48 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':105 'maximum':65 'meaning':188 'metric':99 'micropayment API' 'mimetyp':212 'network':44 'openapi':193 'output':205 'page':89,178 'paid':9,23 'particular':228 'pay-per-call API' 'payment':56 'paywal':40 'per':11,25,68,83,134 'per-cal':10,24 'per-call-pricing' 'post':218 'post-method' 'premium':4,18,34,159 'premium API' 'price':115,131,175 'provid':33,86 'quot':120 'rate':118,141 'render':180 'report':100 'request':84,135,219 'request/response':197 'requir':55,67 'return':50,172 'schema':194 'sentiment':107 'span':96 'specif':152 'standard':52 'stub':185 'suit':93 'summar':110 'text':109 'token':119 'unclear':225 'unit':74 'usdc':14,28,58,76 'usdc-base' 'util':125 'valid':127 'via':146 'wallet':183 'wallet-connect':182 'web3':114 'without':220 'x402':2,16,39,53,147,209 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"fd6c0e9d-4bbc-45ee-a38f-9e2acfc2da74","listingId":"f981234e-cef1-4164-8f24-33e616ed605e","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/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:32.624Z"}],"sources":[{"listingId":"f981234e-cef1-4164-8f24-33e616ed605e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/95","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:32.624Z","lastSeenAt":"2026-04-22T12:01:06.868Z"}],"details":{"listingId":"f981234e-cef1-4164-8f24-33e616ed605e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/95 \\\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 endpoint returns a 402 x402 challenge requiring USDC payment on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/charges/95"},{"claim":"The provider advertises APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API endpoint without API keys or subscriptions","Agent-driven pay-per-call workflows settled in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-use API access on Base","Low-cost per-request API consumption without commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Use cases requiring known, well-documented response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.303Z"},"updatedAt":"2026-04-22T12:01:06.868Z"}}