{"id":"3ba1af23-6451-46dc-b722-6056b97c904c","shortId":"whBdf3","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/charges/67` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The endpoint accepts HTTP POST requests and returns application/json responses. No API keys are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The maximum timeout for payment settlement is 300 seconds.\n\nThe provider's landing page lists sibling 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 specific functionality behind `/api/v1/charges/67` (labeled only \"Premium API Access\") is not documented in detail. No OpenAPI spec, request/response schemas, or usage examples were found in the crawl. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","http-post"],"categories":["api","infrastructure"],"synonyms":["premium API","low fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["The specific functionality of /api/v1/charges/67 ('Premium API Access') is not documented — it is unclear what data or service it returns.","No OpenAPI specification or request/response schema is available.","All documentation pages (docs, pricing, API, README) rendered only a 'Connect wallet' prompt with no substantive content.","The provider hosts many endpoints but none have detailed documentation visible in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/67","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but the actual functionality behind '/api/v1/charges/67' is undocumented. No OpenAPI spec, no request/response schemas, and no examples exist. Docs pages render only a wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,76,164 '0x8335':89 '2913':90 '300':134 'Base network API' 'USDC API access' 'accept':100 'access':7,22,38,177 'addit':211 'ai':65 'analysi':146 'analyt':64 'api':6,21,37,109,176,200 'application/json':106 'attach':115 'base':9,24,84 'behind':171 'broad':60 'call':4,19 'caller':113 'catalog':61 'classif':149 'connect':206 'content':212 'contract':88 'convers':157 'crawl':195 'data':63 'detail':182 'doc':197 'document':180 'embed':150 'endpoint':32,52,99,143 'exact':95 'exact-pay':94 'exampl':190 'exchang':153 'feed':152 'financ':68 'found':192 'function':170 'geocod':155 'header':120 'host':58 'howev':167 'http':101 'http-post' 'infrastructur':71 'json-response' 'key':110 'label':173 'land':139 'learn':67 'list':141 'low fee API' 'lowpaymentfee.com':34 'machin':66 'mani':51 'maximum':128 'micropayment API' 'network':85 'no-api-key' 'offer':53 'one':49 'openapi':184 'page':140,201 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,79,96,119,125,131 'per':3,18,77 'point':166 'post':102 'premium':5,20,36,175 'premium API' 'price':74,151,165,198 'prompt':208 'proof':126 'protocol':43 'provid':35,56,137 'rate':154 'render':203 'request':78,103 'request/response':186 'requir':112 'resourc':46 'respons':107 'return':105 'schema':187 'scheme':97 'second':135 'sentiment':145 'settl':81 'settlement':132 'sibl':142 'simpli':114 'span':62 'spec':185 'specif':45,169 'summar':148 'text':147 'timeout':129 'usag':189 'usdc':15,30,87 'usdc-base' 'use':86 'util':72 'valid':123,156 'via':10,25,39 'wallet':207 'web3':69 'x':118 'x-payment':117 'x402':11,26,41,93,124 'x402 API' 'x402-payment'","prices":[{"id":"dfde0891-be09-4b59-ac95-88e3f7fe60fc","listingId":"3ba1af23-6451-46dc-b722-6056b97c904c","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:29.593Z"}],"sources":[{"listingId":"3ba1af23-6451-46dc-b722-6056b97c904c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:29.593Z","lastSeenAt":"2026-04-22T11:31:35.469Z"}],"details":{"listingId":"3ba1af23-6451-46dc-b722-6056b97c904c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/67 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge on Base network using USDC at maxAmountRequired 20000 (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/charges/67"},{"claim":"Provider lists multiple API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure) all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/67"}],"useCases":["Programmatic access to premium API functionality with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents that need frictionless, keyless API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet","High-volume use cases where $0.02/request adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.428Z"},"updatedAt":"2026-04-22T11:31:35.469Z"}}