{"id":"e5edfce3-9226-4557-9865-de4fd1ee2d72","shortId":"FZBy5U","kind":"x402","title":"Premium API access key via x402 micropayment on Base network, paid in USDC.","tagline":"Premium API access key via x402 micropayment on Base network, paid in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/apikeys/39` appears to be an API key provisioning or access endpoint, part of a broader platform that offers a variety of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation).\n\nThe endpoint is live and returns a valid x402 challenge. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with an exact-scheme payment of up to 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's advertised flat pricing of $0.02/request across all endpoints. The platform advertises no API keys required, no rate limits, and instant access.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this particular endpoint returns. The endpoint's description is simply \"Premium API Access\" and the output schema only indicates it accepts HTTP POST and returns application/json. Without further documentation it is unclear exactly what payload to send or what response to expect from this specific API key endpoint versus the other listed endpoints on the platform.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","api-key-provisioning","json-response","http-post"],"categories":["infrastructure","api-access"],"synonyms":["premium API key","x402 API access","micropayment API","USDC API payment","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — all doc pages render only 'Connect wallet'","The exact request body format and response structure are unknown","Purpose of /api/v1/apikeys/39 specifically (vs other endpoints) is not documented","No rate limit or SLA information provided despite claiming 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/39","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of this specific endpoint (apikeys/39) versus the platform's other endpoints is 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'/request':152 '0.02':139,151 '000':128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':127 '6':134 'Base network API' 'USDC API payment' 'accept':225 'access':3,16,34,52,168,217 'across':153 'advertis':147,158 'ai/ml':72 'analysi':75 'analyt':71 'api':2,15,33,48,68,160,175,216,250 'api-key-provisioning' 'appear':44 'application/json':230 'base':9,22,112,129 'broader':57 'challeng':106 'classif':77 'connect':184 'consist':142 'content':190 'contract':116 'convers':95 'data':70,81 'decim':135 'descript':202,212 'detail':201 'doc':174 'document':169,233 'embed':78 'endpoint':28,53,98,155,207,210,252,257 'estim':89 'exact':121,237 'exact-schem':120 'exampl':198 'exchang':84 'expect':246 'extrem':171 'feed':83 'financ':79 'flat':148 'gas':88 'generat':96 'geocod':93 'http':226 'http-post' 'indic':223 'infer':73 'infrastructur':91 'instant':167 'json-response' 'key':4,17,49,161,251 'limit':165 'list':256 'live':100 'lowpaymentfee' 'lowpaymentfee.com':30 'micropay':7,20 'micropayment API' 'network':10,23,113 'offer':60 'openapi':194 'output':220 'page':179 'paid':11,24 'part':54 'particular':206 'pay':65 'pay-per-call API' 'pay-per-request':64 'payload':239 'payment':38,107,123 'per':66,140 'platform':58,145,157,260 'post':227 'premium':1,14,32,215 'premium API key' 'price':82,149,176 'prompt':186 'protocol':39 'provid':31 'provis':50 'quot':87 'rate':85,164 'readm':178 'render':181 'request':67,141 'request/response':197 'requir':162 'resourc':42 'respons':244 'return':102,208,229 'schema':195,221 'scheme':122 'send':241 'sentiment':74 'settl':109 'simpli':214 'sinc':131 'span':69 'spars':172 'specif':41,249 'substant':189 'summar':76 'token':86 'translat':137 'unclear':236 'unit':130 'usdc':13,26,115,132 'usdc-base-network' 'use':114,133 'util':92 'valid':94,104 'varieti':62 'versus':253 'via':5,18,35 'wallet':185 'web3':80 'without':231 'x402':6,19,37,105 'x402 API access' 'x402-payment'","prices":[{"id":"19451150-b1e8-43a1-a5ef-463a525a3879","listingId":"e5edfce3-9226-4557-9865-de4fd1ee2d72","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:28.367Z"}],"sources":[{"listingId":"e5edfce3-9226-4557-9865-de4fd1ee2d72","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:28.367Z","lastSeenAt":"2026-04-23T08:02:07.656Z"}],"details":{"listingId":"e5edfce3-9226-4557-9865-de4fd1ee2d72","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/39 \\\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":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/39"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/39"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Acquiring premium API access credentials via a single micropayment","Programmatic pay-per-use access to a multi-category API platform","Agent-driven API key procurement without traditional signup"],"bestFor":["Agents needing instant, no-signup API access via crypto micropayment","Developers who want pay-per-request pricing without subscriptions","Automated workflows requiring on-demand API key provisioning on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.226Z"},"updatedAt":"2026-04-23T08:02:07.656Z"}}