{"id":"6e3102d5-d9e0-4b4d-83ab-aad2411966fd","shortId":"APLkkR","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/151` 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 max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. The payment timeout is 300 seconds. The response MIME type is `application/json`.\n\nNote that the specific functionality behind `/api/v1/charges/151` is not documented beyond the label \"Premium API Access.\" The broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02 price point. However, the crawled documentation pages returned only \"Connect wallet\" with no further technical detail, so the exact input/output schema for this particular endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","low fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["The exact functionality behind /api/v1/charges/151 ('Premium API Access') is not described anywhere in the crawled material.","All documentation, pricing, API, and README pages returned only 'Connect wallet' with no substantive content.","No OpenAPI spec or input/output schema is available — callers cannot know what to send or what to expect back.","The platform lists many endpoints but none have detailed documentation visible in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/151","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/151","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 USDC on Base), but the specific functionality of /api/v1/charges/151 is undocumented. No OpenAPI schema, no input/output examples, and all documentation pages returned only 'Connect wallet' with no content. The endpoint is effectively a stub 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'0.02':12,28,77,134,188 '000':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20':123 '300':139 '6':129 'Base network API' 'USDC API access' 'accept':106 'access':7,23,40,162 'ai':63 'amount':120 'analysi':170 'analyt':62 'api':6,22,39,89,161 'application/json':146 'base':9,25,85,117,125 'behind':152 'beyond':157 'broader':164 'call':4,20 'categori':71 'challeng':100 'classif':173 'commit':97 'confirm':101 'connect':198 'contract':114 'convers':181 'crawl':193 'data':61 'decim':130 'detail':204 'document':156,194 'embed':174 'endpoint':34,54,73,103,167,213 'equal':133 'exact':207 'exchang':177 'feed':176 'financ':66 'function':151 'geocod':179 'howev':191 'infrastructur':69 'input/output':208 'json-response' 'key':90 'label':159 'learn':65 'limit':93 'list':166 'live':105 'low fee API' 'lowpaymentfee.com':36 'machin':64 'mani':53 'max':119 'micropayment API' 'mime':143 'minimum':96 'network':86 'no-api-key' 'no-rate-limit' 'note':147 'offer':55 'one':51 'page':195 'particular':212 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payabl':80 'payment':44,111,136 'per':3,13,19,29,78 'platform':58,165 'point':190 'post':107 'premium':5,21,38,160 'premium API' 'price':75,175,189 'protocol':45 'provid':37 'rate':92,178 'request':14,30,79,108 'requir':121 'resourc':48 'respons':142 'return':196 'schema':209 'second':140 'sentiment':169 'settl':110 'span':60 'specif':47,150 'summar':172 'technic':203 'text':171 'timeout':137 'type':144 'unit':126 'unknown':215 'usdc':16,32,82,113,132 'usdc-base' 'util':70 'valid':180 'via':10,26,41 'wallet':199 'web3':67 'x402':11,27,43,99 'x402 API' 'x402-payment'","prices":[{"id":"50604d89-b01c-4b0b-88b6-e31a27b5e692","listingId":"6e3102d5-d9e0-4b4d-83ab-aad2411966fd","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/151","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:27.225Z"}],"sources":[{"listingId":"6e3102d5-d9e0-4b4d-83ab-aad2411966fd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/151","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:27.225Z","lastSeenAt":"2026-04-24T04:03:33.138Z"}],"details":{"listingId":"6e3102d5-d9e0-4b4d-83ab-aad2411966fd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/151 \\\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 (6 decimals) = $0.02, with 300s timeout on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/151"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/151"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API services without API key registration","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access"],"bestFor":["Developers wanting frictionless pay-per-use API access without subscriptions","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without USDC on Base or unfamiliar with crypto payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.394Z"},"updatedAt":"2026-04-24T04:03:33.138Z"}}