{"id":"d5948cf0-7416-44c8-9482-919c98f506f0","shortId":"7tmJ4T","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 — all priced at $0.02 per request paid in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/61` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises a no-API-key, no-rate-limit, instant-access model where each call is paid individually via the x402 protocol. The x402 challenge confirms the endpoint is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (0.02 USD given 6 decimals), and settles to a wallet on the Base network.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The platform lists sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more, but the specific purpose of `/api/v1/payments/61` remains unclear from available sources.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method"],"categories":["general","infrastructure"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC API access","pay-per-call API","Base network API","micropayment API"],"warnings":["The specific functionality of /api/v1/payments/61 ('Premium API Access') is undocumented — it is unclear what data or service it returns.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available.","No examples of successful responses exist in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/61","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/payments/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no request/response schema, no examples, and the specific functionality of this endpoint is unknown. The docs pages are empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,70,150 '000':145 '20':144 '6':153 'Base network API' 'USDC API access' 'accept':137 'access':7,22,38,88,117 'advertis':105 'ai':58 'analysi':210 'analyt':57 'api':6,21,37,87,109,170 'avail':198,231 'base':9,24,78,146,162 'beyond':100 'call':4,19,121 'categori':66 'challeng':92,131 'charg':140 'classif':213 'confirm':132 'connect':179 'content':185 'crawl':201 'data':56 'decim':154 'doc':169 'document':99,164 'embed':214 'endpoint':32,49,82,134,207 'exact':95 'exampl':197 'exchang':217 'extrem':166 'feed':216 'financ':61 'function':96 'geocod':219 'given':152 'individu':124 'infrastructur':64 'instant':116 'instant-access':115 'key':110 'label':85,102 'learn':60 'limit':114 'list':205 'live':136 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':48 'materi':202 'maximum':142 'micropayment API' 'model':118 'network':79,163 'no-api-key':107 'no-rate-limit':111 'offer':50 'one':46 'openapi':189 'page':174 'paid':73,123 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42 'per':3,18,71 'platform':53,104,204 'post':138 'post-method' 'premium':5,20,36,86 'premium API' 'price':68,171,215 'prompt':181 'protocol':43,128 'provid':35 'purpos':225 'rate':113,218 'readm':173 'remain':228 'render':176 'request':72,139 'request/response':192 'schema':193 'sentiment':209 'settl':156 'sibl':206 'sourc':232 'span':55 'spars':167 'spec':190 'specif':81,224 'summar':212 'text':211 'unclear':229 'unit':147 'usag':196 'usd':151 'usdc':15,30,75,149 'usdc-base-network' 'util':65 'via':10,25,39,125 'wallet':159,180 'web3':62 'x402':11,26,41,91,127,130 'x402 API' 'x402-payment'","prices":[{"id":"45a6bec1-882e-4928-afe9-ebb8fdcc2298","listingId":"d5948cf0-7416-44c8-9482-919c98f506f0","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/payments/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:51.975Z"}],"sources":[{"listingId":"d5948cf0-7416-44c8-9482-919c98f506f0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:51.975Z","lastSeenAt":"2026-04-22T07:01:11.863Z"}],"details":{"listingId":"d5948cf0-7416-44c8-9482-919c98f506f0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/61 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/61"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/61"},{"claim":"The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API endpoint with per-call USDC micropayments on Base","Testing x402 payment protocol integrations against a live endpoint","Paying for API access without creating accounts or managing API keys"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base for per-call access","Low-volume or sporadic API usage where subscription pricing is wasteful"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.871Z"},"updatedAt":"2026-04-22T07:01:11.863Z"}}