{"id":"d1f346c2-a6aa-4412-9d1d-463f8b232896","shortId":"9DAGCZ","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/187` 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. No API keys or rate limits are advertised; access is granted per-call upon payment. The timeout window is 300 seconds.\n\nDocumentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no description of what the `/api/v1/accounts/187` endpoint actually returns. The landing page lists many sibling endpoints but does not describe their input or output formats. The endpoint's purpose (\"Premium API Access\") is generic and uninformative. Prospective callers should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","No OpenAPI or schema describing request inputs or response outputs","The specific purpose of /api/v1/accounts/187 is unknown; 'Premium API Access' is a generic label","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/187","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/187","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, no OpenAPI spec, no request/response schema, and the endpoint's actual function ('Premium API Access') is entirely opaque. All non-landing crawl pages returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,78,125 '000':115 '0x8335':99 '20':114 '2913':100 '300':146 '6':120 'Base network API' 'USDC API access' 'access':7,22,38,134,210 'actual':186 'advertis':60,133 'ai':67 'amount':111 'analyt':66 'api':6,21,37,127,155,209 'appear':48 'base':9,24,103,116 'base-network' 'broad':62 'call':4,19,139 'caller':216 'catalog':63 'challeng':90 'connect':163 'contact':222 'content':169 'contract':98 'data':65 'decim':121 'describ':198 'descript':180 'detail':226 'doc':153 'document':148 'endpoint':32,54,82,185,194,205 'equal':124 'exact':107 'expect':218 'experi':220 'extrem':150 'financ':70 'format':203 'generic':212 'grant':136 'infrastructur':73 'input':200 'json-response' 'key':128 'land':189 'learn':69 'limit':131 'list':191 'live':84 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'mani':53,192 'max':110 'micropayment API' 'network':104 'no-api-key' 'offer':55 'one':51 'openapi':173 'output':202 'page':158,190 'path':46 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,93,141 'per':3,18,79,138 'per-cal':137 'platform':58 'post':92 'premium':5,20,36,208 'price':76,154 'prompt':165 'prospect':215 'protocol':43 'provid':35,224 'purpos':207 'rate':130 'readm':157 'render':160 'request':80 'request/response':176 'requir':112 'return':86,187 'schema':177 'scheme':108 'second':147 'settl':95 'sibl':193 'span':64 'spec':174 'specif':45 'substant':168 'thin':151 'timeout':143 'uninform':214 'unit':117 'upon':140 'usdc':15,30,97,123 'usdc-settlement' 'use':105 'util':74 'valid':88 'via':10,25,39 'wallet':164 'web3':71 'window':144 'x402':11,26,41,89 'x402 API' 'x402-payment'","prices":[{"id":"a070eb57-a985-496b-8648-739fcba82151","listingId":"d1f346c2-a6aa-4412-9d1d-463f8b232896","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/187","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:36.165Z"}],"sources":[{"listingId":"d1f346c2-a6aa-4412-9d1d-463f8b232896","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/187","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:36.165Z","lastSeenAt":"2026-04-23T06:04:01.693Z"}],"details":{"listingId":"d1f346c2-a6aa-4412-9d1d-463f8b232896","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/187 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/187"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/187"},{"claim":"The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or utility endpoints without API key registration","Agent-driven pay-per-call workflows settled in USDC on Base","Exploring a multi-category API marketplace (analytics, AI, finance, infrastructure)"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.668Z"},"updatedAt":"2026-04-23T06:04:01.693Z"}}