{"id":"0c3e5623-7770-4cb8-8828-91fe38a3c6c7","shortId":"vB4pLV","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 site hosts a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/90` appears to be part of the platform's API key management or access provisioning system. The x402 challenge confirms it accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call, and settles payments to a specified wallet on Base. No API keys or rate limits are advertised — access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content visible to crawlers. There is no OpenAPI schema, no request/response examples, and no detailed description of what this particular endpoint returns. The platform's landing page lists many endpoints but provides no technical documentation beyond names and prices.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","api-key-provisioning"],"categories":["infrastructure","api-access"],"synonyms":["premium API access","x402 API","micropayment API","pay-per-call","USDC API access","Base network API","lowpaymentfee"],"warnings":["No OpenAPI schema or technical documentation available","Docs/pricing/README pages render only 'Connect wallet' with no content for crawlers","The exact functionality of /api/v1/apikeys/90 is unclear — it may provision API keys or grant access but this is inferred from the URL path alone","No request body schema or response format documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/90","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/apikeys/90","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no schema, no request/response examples, and the specific purpose of this endpoint is unclear beyond its title 'Premium API 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'/request':13,28 '0.02':12,27,69,117 '000':111 '20':110 '6':121 'Base network API' 'USDC API access' 'accept':103 'access':7,22,38,95,142 'advertis':141 'ai/ml':58 'analyt':57 'api':6,21,37,54,91,135,154 'api-key-provisioning' 'appear':83 'base':9,24,77,112,133 'base-network' 'beyond':204 'call':4,19,124 'challeng':100 'charg':106 'collect':48 'confirm':101 'connect':163 'content':169 'crawler':172 'data':56,62 'decim':122 'descript':184 'detail':183 'doc':153 'document':148,203 'endpoint':32,81,189,198 'exampl':180 'extrem':150 'financ':60 'gate':144 'given':118 'host':46 'i.e':116 'infer':59 'infrastructur':64 'key':92,136 'land':194 'limit':139 'list':196 'lowpaymentfee' 'lowpaymentfee.com':34 'manag':93 'mani':197 'maximum':108 'micropay':147 'micropayment API' 'name':205 'network':78 'openapi':176 'page':158,195 'part':86 'particular':188 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':50 'payment':42,127 'per':3,18,52,70,123 'platform':89,192 'post':104 'premium':5,20,36 'premium API access' 'price':67,155,207 'prompt':165 'protocol':43 'provid':35,200 'provis':96 'pure':145 'rate':138 'readm':157 'render':160 'request':53,71,105 'request/response':179 'return':190 'schema':177 'settl':72,126 'site':45 'span':55 'spars':151 'specif':80 'specifi':130 'substant':168 'system':97 'technic':202 'unit':113 'usdc':15,30,74,115,119 'usdc-micropayment' 'util':65 'via':10,25,39 'visibl':170 'wallet':131,164 'web3':61 'x402':11,26,41,99 'x402 API' 'x402-payment'","prices":[{"id":"0c3a40d9-9b87-441e-bbbf-fb0e42f4d95a","listingId":"0c3e5623-7770-4cb8-8828-91fe38a3c6c7","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/apikeys/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:39.771Z"}],"sources":[{"listingId":"0c3e5623-7770-4cb8-8828-91fe38a3c6c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:39.771Z","lastSeenAt":"2026-04-23T05:01:54.910Z"}],"details":{"listingId":"0c3e5623-7770-4cb8-8828-91fe38a3c6c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/90 \\\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 x402 challenge accepting USDC on Base network at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/apikeys/90"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/90"}],"useCases":["Provisioning or managing API keys via micropayment without traditional signup","Agent-driven access to premium endpoints using x402 payment protocol","Programmatic pay-as-you-go API consumption without subscriptions"],"bestFor":["Developers wanting no-signup, pay-per-use API access","AI agents that can settle x402 micropayments autonomously","Users who prefer crypto-native payment rails over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.698Z"},"updatedAt":"2026-04-23T05:01:54.910Z"}}