{"id":"279810b6-4c39-4a10-8d61-8ac6f0eb2baa","shortId":"2vzbnB","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. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. The specific endpoint `/api/v1/accounts/198` is listed under the platform's premium access tier, accepting POST requests and settling payments in USDC on the Base network.\n\nPricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20000 base units of USDC, which has 6 decimals, equaling $0.02). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header with each request. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. The exact functionality of the `/api/v1/accounts/198` endpoint is unclear — the description simply says \"Premium API Access\" with no schema for request body or response. The platform hosts many other endpoints (analytics, AI, finance, utilities) all at the same $0.02 price point, but details on what this specific accounts endpoint returns are not documented in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","json-response"],"categories":["api-access","infrastructure"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API","Base network API","lowpaymentfee","accounts API"],"warnings":["No documentation available — all doc pages show only 'Connect wallet'","No request or response schema provided for this endpoint","The exact functionality of /api/v1/accounts/198 is undocumented","Platform lists many endpoints but none have detailed specs in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/198","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what the endpoint actually does, no request/response schema, and all doc pages render only 'Connect wallet'. The specific purpose of /api/v1/accounts/198 is 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'/request':13,28 '0.02':12,27,94,114,211 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':148 '20000':104 '6':111 'Base network API' 'USDC API' 'accept':80 'access':7,22,38,78,126,188 'account':220 'accounts API' 'address':142 'advertis':100,117 'ai':58,204 'analyt':57,203 'api':6,21,37,119,158,187 'attach':129 'base':9,24,90,105,150 'bodi':194 'call':4,19 'caller':127 'categori':66 'challeng':99 'connect':166 'content':172 'contract':147 'crawl':228 'data':56 'decim':112 'descript':183 'detail':215 'doc':156 'document':151,225 'endpoint':32,49,69,179,202,221 'equal':113 'exact':174 'extrem':153 'financ':61,205 'function':175 'header':133 'host':199 'infrastructur':64 'instant':125 'json-response' 'key':120 'learn':60 'limit':123 'list':72 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':48,200 'materi':229 'maxamountrequir':102 'network':91 'offer':50 'one':46 'page':161 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,85,132,138 'per':3,18,95 'platform':53,75,116,198 'point':213 'post':81 'post-method' 'premium':5,20,36,77,186 'premium API' 'price':92,157,212 'prompt':168 'protocol':43 'provid':35 'rate':122 'readm':160 'render':163 'request':82,96,136,193 'respons':196 'return':222 'say':185 'schema':191 'sent':140 'settl':84 'simpli':128,184 'span':55 'spars':154 'specif':68,219 'tier':79 'unclear':181 'unit':106 'usdc':15,30,87,108,146 'usdc-base' 'use':144 'util':65,206 'via':10,25,39 'wallet':167 'web3':62 'x402':11,26,41,98,131 'x402 endpoint' 'x402-payment'","prices":[{"id":"4cb7be24-33ac-4465-97e9-db5ccff7ac87","listingId":"279810b6-4c39-4a10-8d61-8ac6f0eb2baa","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:43.381Z"}],"sources":[{"listingId":"279810b6-4c39-4a10-8d61-8ac6f0eb2baa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/198","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:43.381Z","lastSeenAt":"2026-04-27T16:34:08.917Z"}],"details":{"listingId":"279810b6-4c39-4a10-8d61-8ac6f0eb2baa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/198 \\\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":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/198"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/198"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium account data via a single paid API call","Integrating pay-per-use API access into agent workflows without API keys","Demonstrating x402 payment protocol usage on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users needing detailed API documentation before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.322Z"},"updatedAt":"2026-04-27T16:34:08.917Z"}}