{"id":"75f50886-6c5f-4f27-a0fe-bc38367d142a","shortId":"Fffubx","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. This specific endpoint (`/api/v1/apikeys/11`) is listed as \"Premium API Access\" and accepts USDC payments at a maximum cost of 20,000 base units (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is settled on-chain to a specified wallet address, with no API keys, rate limits, or upfront commitments required.\n\nThe broader platform advertises four categories of endpoints: 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 the same $0.02/request price point. However, this listing covers only the `/api/v1/apikeys/11` endpoint, whose specific functionality beyond \"Premium API Access\" is not documented in detail.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. It accepts POST requests and returns `application/json`. Documentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Docs, pricing, API, and README pages on the site contain no usable content (only 'Connect wallet')","The specific functionality of /api/v1/apikeys/11 ('Premium API Access') is undocumented — unclear what it returns","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/11","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is virtually no documentation: no OpenAPI spec, no request/response schemas, no examples, and the site's docs/pricing/README pages are all empty beyond a wallet-connect prompt. The purpose of this specific endpoint ('Premium API Access' at /api/v1/apikeys/11) is unclear — it may generate API keys or serve as a generic gateway, but nothing confirms 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'/request':149 '0.02':9,22,71,148 '000':67 '1':186 '20':66 '402':183 '6':77 'Base network API' 'USDC API access' 'accept':58,191 'access':3,16,56,166 'address':89 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':2,15,36,55,92,165,207 'application/json':196 'avail':236 'base':8,21,45,68 'beyond':163 'broader':101 'call':35 'categori':105 'chain':84 'challeng':181 'classif':122 'commit':98 'connect':215 'content':240 'convers':139 'cost':64 'cover':155 'crawl':239 'data':108,112 'decim':78 'detail':171,222 'doc':205 'document':169,197,231 'embed':123 'endpoint':37,49,107,142,159,173 'estim':133 'exampl':235 'exchang':128 'export':113 'extrem':202 'feed':127 'financ':124 'four':104 'function':162 'gas':132 'gate':38 'generat':140 'geocod':137 'howev':152 'http':182 'i.e':70 'infrastructur':135 'insight':114 'json-api' 'key':93 'learn':117 'limit':95 'list':52,144,154 'live':175 'lowpaymentfee' 'lowpaymentfee.com':27 'machin':116 'maximum':63 'metric':110 'micropay':6,19 'micropayment API' 'network':46 'offer':28 'on-chain':82 'openapi':226 'page':210 'pay':33 'pay-per-cal':32 'pay-per-call API' 'pay-per-request' 'payment':60,79 'per':10,23,34,72 'platform':102 'point':151 'post':192 'post-method' 'premium':1,14,54,164 'price':126,150,206 'prompt':217 'protocol':42,189 'quot':131 'rate':94,129 'readm':209 'render':212 'report':111 'request':11,24,73,193 'request/response':229 'requir':99 'return':177,195 'schema':230 'sentiment':118 'settl':81 'sinc':74 'site':200 'spec':227 'specif':48,161 'specifi':87 'suit':30 'summar':121 'technic':221 'text':120 'thin':203 'token':130 'unit':69 'upfront':97 'usag':234 'usdc':13,26,59,75 'usdc-base' 'use':76 'util':136 'valid':138,179 'version':185 'via':4,17 'wallet':88,216 'web3':125 'whose':160 'x402':5,18,41,180 'x402 API' 'x402-payment'","prices":[{"id":"d5ce3e32-d19c-4e91-83ff-1cc6df62d879","listingId":"75f50886-6c5f-4f27-a0fe-bc38367d142a","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:31.439Z"}],"sources":[{"listingId":"75f50886-6c5f-4f27-a0fe-bc38367d142a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:31.439Z","lastSeenAt":"2026-04-22T08:31:55.582Z"}],"details":{"listingId":"75f50886-6c5f-4f27-a0fe-bc38367d142a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/11 \\\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 a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/11"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/11"}],"useCases":["Programmatic access to premium API services without API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Low-friction API consumption with no subscription or rate limits"],"bestFor":["Developers or agents wanting zero-commitment, per-request API billing","x402-compatible clients on the Base network","Use cases requiring on-chain payment settlement in USDC"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.075Z"},"updatedAt":"2026-04-22T08:31:55.582Z"}}