{"id":"ee138d35-27f8-41c1-97b3-f0f3c77233e8","shortId":"LwnFmV","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 on the Base network. It accepts POST requests and charges 0.02 USDC per call (maxAmountRequired of 20000 base units with 6 decimals = $0.02). Payment is settled in USDC (contract 0x8335…2913) on Base L2, with no API keys, no rate limits, and instant access.\n\nThe provider hosts a broader suite of endpoints 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 endpoints are listed at $0.02/request with the same x402 payment model.\n\nThis specific endpoint (/api/v1/transactions/286) is labeled \"Premium API Access\" but lacks detailed documentation on what data or functionality it returns. The docs, pricing, and API pages on the site require a wallet connection and provide no further schema or example responses. The endpoint is confirmed live (402 challenge captured), but the actual response payload after payment is undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","no-rate-limit","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available for what this endpoint returns after payment","The resource path /api/v1/transactions/286 is not listed among the site's advertised APIs","All doc/pricing/API pages require wallet connection and show no useful content","No OpenAPI spec, no response schema, no example responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/286","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/transactions/286","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no documentation on what the endpoint actually returns, no request/response schema, and the specific resource path (/api/v1/transactions/286) is not explained anywhere on the site. Docs pages only show 'Connect wallet' with no 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'/request':13,28,136 '0.02':12,27,54,66,135 '0x8335':73 '20000':60 '2913':74 '402':189 '402 payment API' '6':64 'Base network API' 'USDC micropayment endpoint' 'accept':49 'access':7,22,38,87,151 'actual':194 'ai':104 'analysi':108 'analyt':98 'api':6,21,37,80,150,167 'base':9,24,46,61,76 'base-network' 'broader':92 'call':4,19,57 'captur':191 'challeng':190 'charg':53 'classif':111 'confirm':187 'connect':175 'contract':72 'convers':128 'crypto-paid API' 'data':97,101,158 'decim':65 'detail':154 'doc':164 'document':155 'embed':112 'endpoint':32,95,131,145,185 'estim':122 'exampl':182 'exchang':117 'export':102 'feed':116 'financ':113 'function':160 'gas':121 'generat':129 'geocod':126 'host':90 'infrastructur':124 'insight':103 'instant':86 'key':81 'l2':77 'label':148 'lack':153 'learn':106 'limit':84 'list':133 'live':188 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':105 'maxamountrequir':58 'metric':99 'model':142 'network':47 'no-api-key' 'no-rate-limit' 'page':168 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':196 'payment':42,67,141,198 'per':3,18,56 'post':50 'post-method' 'premium':5,20,36,149 'price':115,165 'protocol':43 'provid':35,89,177 'quot':120 'rate':83,118 'report':100 'request':51 'requir':172 'respons':183,195 'return':162 'schema':180 'sentiment':107 'settl':69 'site':171 'span':96 'specif':144 'suit':93 'summar':110 'text':109 'token':119 'undocu':200 'unit':62 'usdc':15,30,55,71 'usdc-settlement' 'util':125 'valid':127 'via':10,25,39 'wallet':174 'web3':114 'x402':11,26,41,140 'x402 API' 'x402-payment'","prices":[{"id":"25ddd52e-3f8a-4d73-8c1f-bb6dfafe0b05","listingId":"ee138d35-27f8-41c1-97b3-f0f3c77233e8","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/transactions/286","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:50.159Z"}],"sources":[{"listingId":"ee138d35-27f8-41c1-97b3-f0f3c77233e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/286","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:50.159Z","lastSeenAt":"2026-04-22T17:02:15.916Z"}],"details":{"listingId":"ee138d35-27f8-41c1-97b3-f0f3c77233e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/286 \\\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 402 with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/286"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/286"}],"useCases":["Programmatic access to premium data or services without subscription commitments","Agent-driven API consumption with per-call USDC micropayments","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with crypto wallets that can settle x402 challenges","Users who prefer no rate limits and no API key management"],"notFor":["Users needing detailed API documentation or response schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.662Z"},"updatedAt":"2026-04-22T17:02:15.916Z"}}