{"id":"147aefde-c2d1-497d-9629-3b3d549a3e91","shortId":"C2DKkX","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 path `/api/v1/accounts/69` appears to be one of many endpoints offered by the platform, which advertises a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nThe endpoint is live and returns a valid x402 challenge on POST. Payment is settled in USDC (contract 0x8335…2913) on the Base network using the \"exact\" scheme. The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. There are no API keys, no rate limits, and no sign-up required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. The specific functionality of the `/api/v1/accounts/69` endpoint is not documented beyond the label \"Premium API Access,\" so the exact data returned is unknown. The broader platform lists sibling endpoints for metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more, but none have detailed schema documentation available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The specific functionality and response schema of /api/v1/accounts/69 is undocumented; 'Premium API Access' is the only description.","No OpenAPI spec or output schema beyond basic HTTP method info.","The broader platform lists many endpoints but none have detailed documentation in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/69","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/accounts/69","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation for what the endpoint actually returns, no OpenAPI schema, no example requests or responses, and the docs/pricing/README pages are all empty beyond a wallet connect prompt. The specific purpose of /api/v1/accounts/69 is entirely 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'/request':13,28 '0.02':12,27,78,125 '000':115 '0x8335':99 '20':114 '2913':100 '6':120 'Base network API' 'USDC micropayment API' 'access':7,22,38,191 'advertis':60 'ai':67 'amount':111 'analysi':209 'analyt':66 'api':6,21,37,129,161,190 'appear':48 'attach':142 'avail':227 'base':9,24,103,116 'base-network' 'beyond':186 'broad':62 'broader':200 'call':4,19 'caller':140 'catalog':63 'challeng':90 'classif':212 'connect':169 'content':175 'contract':98 'crawl':230 'crypto-paid API' 'data':65,195 'decim':121 'detail':224 'doc':159 'document':154,185,226 'embed':213 'endpoint':32,54,82,182,204 'equal':124 'exact':107,194 'exchang':216 'extrem':156 'feed':215 'financ':70 'function':178 'geocod':218 'header':147 'infrastructur':73 'json-response' 'key':130 'label':188 'learn':69 'limit':133 'list':202 'live':84 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'mani':53 'max':110 'metric':206 'network':104 'no-api-key' 'no-rate-limit' 'none':222 'offer':55 'one':51 'page':164 'path':46 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,93,146,152 'per':3,18,79 'platform':58,201 'post':92 'premium':5,20,36,189 'premium API access' 'price':76,160,214 'prompt':171 'proof':153 'protocol':43 'provid':35 'rate':132,217 'readm':163 'render':166 'report':207 'request':80 'requir':112,139 'return':86,196 'schema':225 'scheme':108 'sentiment':208 'settl':95 'sibl':203 'sign':137 'sign-up':136 'simpli':141 'span':64 'spars':157 'specif':45,177 'summar':211 'text':210 'unit':117 'unknown':198 'usdc':15,30,97,123 'usdc-settlement' 'use':105 'util':74 'valid':88,150 'via':10,25,39 'wallet':170 'web3':71 'x':145 'x-payment':144 'x402':11,26,41,89,151 'x402 API' 'x402-payment'","prices":[{"id":"6413e3ab-ca45-483d-a2a6-9ac64bfeddf1","listingId":"147aefde-c2d1-497d-9629-3b3d549a3e91","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/accounts/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:01.311Z"}],"sources":[{"listingId":"147aefde-c2d1-497d-9629-3b3d549a3e91","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:01.311Z","lastSeenAt":"2026-04-22T18:31:07.791Z"}],"details":{"listingId":"147aefde-c2d1-497d-9629-3b3d549a3e91","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header.\n# First, obtain the payment challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/69\n# Returns 402 with x402 challenge. Build payment proof for\n# 20000 base units USDC on Base, then:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/69 \\\n  -H \"X-PAYMENT: <your-x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/69"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/69"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to paid endpoints without subscriptions"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users needing detailed API documentation or OpenAPI schemas before integrating","Anyone without USDC on Base or an x402-compatible payment client","High-volume consumers who need bulk pricing or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.336Z"},"updatedAt":"2026-04-22T18:31:07.791Z"}}