{"id":"add7053d-fddc-46b4-b6b8-313acf2793d1","shortId":"YgpPUm","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/charges/367` is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The `maxAmountRequired` of 20000 base units equals $0.02 (USDC uses 6 decimals). The payment scheme is \"exact\" with a 300-second timeout. The response MIME type is `application/json`.\n\nNote that the specific endpoint `/api/v1/charges/367` does not clearly map to any of the named API categories listed on the site (analytics, AI, finance, infrastructure). It may be a generic charge endpoint or a specific resource. Documentation beyond the landing page is effectively empty — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. Without OpenAPI specs, request/response schemas, or usage examples, the exact functionality behind this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — all doc pages render only 'Connect wallet'","The specific endpoint /api/v1/charges/367 does not map to any named API on the site; its exact functionality is unknown","No request body schema or response schema provided","No usage examples or error handling documentation available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/367","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/367","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but there is no OpenAPI schema, no request/response examples, and no meaningful documentation — docs pages only show 'Connect wallet'. The specific purpose of /api/v1/charges/367 is 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'0.02':12,28,77,125 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20000':121 '300':137 '6':128 'Base network API' 'USDC API access' 'accept':106 'access':7,23,40 'ai':63,168 'analyt':62,167 'api':6,22,39,89,161,192 'application/json':145 'base':9,25,85,117,122 'base-network' 'behind':219 'beyond':183 'call':4,20 'categori':71,162 'challeng':100 'charg':176 'clear':154 'commit':97 'confirm':101 'connect':201 'content':207 'contract':114 'crypto-paid API' 'data':61 'decim':129 'doc':191 'document':182 'effect':188 'empti':189 'endpoint':34,54,73,103,150,177,222 'equal':124 'exact':134,217 'exampl':215 'financ':66,169 'function':218 'generic':175 'infrastructur':69,170 'json-response' 'key':90 'land':185 'learn':65 'limit':93 'list':163 'live':105 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':64 'mani':53 'map':155 'maxamountrequir':119 'may':172 'micropayment API' 'mime':142 'minimum':96 'name':160 'network':86 'no-api-key' 'note':146 'offer':55 'one':51 'openapi':209 'page':186,196 'particular':221 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payabl':80 'payment':44,111,131 'per':3,13,19,29,78 'platform':58 'post':107 'post-method' 'premium':5,21,38 'price':75,193 'prompt':203 'protocol':45 'provid':37 'rate':92 'readm':195 'remain':223 'render':198 'request':14,30,79,108 'request/response':211 'resourc':48,181 'respons':141 'schema':212 'scheme':132 'second':138 'settl':110 'site':166 'span':60 'spec':210 'specif':47,149,180 'timeout':139 'type':143 'unclear':224 'unit':123 'usag':214 'usdc':16,32,82,113,126 'usdc-settlement' 'use':127 'util':70 'via':10,26,41 'wallet':202 'web3':67 'without':208 'x402':11,27,43,99 'x402 API' 'x402-payment'","prices":[{"id":"82fb1c55-a811-4fbf-b54f-25331d59f3dd","listingId":"add7053d-fddc-46b4-b6b8-313acf2793d1","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/367","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:14.526Z"}],"sources":[{"listingId":"add7053d-fddc-46b4-b6b8-313acf2793d1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/367","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:14.526Z","lastSeenAt":"2026-04-24T00:31:57.326Z"}],"details":{"listingId":"add7053d-fddc-46b4-b6b8-313acf2793d1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/367 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base with exact scheme and 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/367"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/367"},{"claim":"Platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-use API services into agent workflows"],"bestFor":["Developers who want instant API access without signup or API keys","Agents that can settle x402 payments in USDC on Base","Use cases requiring low-cost per-request pricing with no commitments"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who prefer subscription-based pricing","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.155Z"},"updatedAt":"2026-04-24T00:31:57.326Z"}}