{"id":"59ef85a7-d032-4c34-9721-ec3ae301fc00","shortId":"6N6SFu","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/payments/40` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: 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 listed endpoints share the same $0.02/request pricing. However, the specific functionality behind the `/api/v1/payments/40` path is not documented beyond the generic \"Premium API Access\" label, so its exact response payload is unknown.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for request or response payloads","The exact functionality of /api/v1/payments/40 ('Premium API Access') is undocumented and unclear","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/40","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/40","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what the endpoint actually returns, no OpenAPI spec, no request/response schemas, and no usage examples. The /docs and other pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/payments/40 is entirely 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'/api/v1/payments/40':58,177 '/docs':201 '/pricing':203 '/readme':205 '/request':169 '0.02':12,28,89,168 '000':84 '0x8335':74 '20':83 '2913':75 '6':94 'Base network API' 'USDC micropayment API' 'accept':65 'access':7,23,44,63,187 'across':126 'advertis':124 'ai':136 'amount':81 'analysi':140 'analyt':130 'api':6,22,42,62,97,186 'attach':108 'avail':232 'base':9,25,52,77,85 'base-network' 'behind':175 'beyond':182 'broader':121 'call':4,20,91 'caller':106 'categori':128 'classif':143 'collect':36 'commit':103 'connect':211 'content':236 'contract':73 'convers':160 'crawl':235 'crypto-paid endpoint' 'data':129,133 'decim':95 'detail':218 'document':181,196,227 'embed':144 'endpoint':43,56,125,164 'equal':88 'estim':154 'exact':191 'exampl':231 'exchang':149 'export':134 'extrem':198 'feed':148 'financ':145 'four':127 'function':174 'gas':153 'generat':161 'generic':184 'geocod':158 'header':113 'host':34 'howev':171 'infrastructur':156 'insight':135 'key':98 'label':60,188 'learn':138 'limit':100 'list':163 'lowpaymentfee' 'lowpaymentfee.com':33,122 'machin':137 'maximum':80 'metric':131 'network':53 'no-api-key' 'openapi':222 'page':206 'path':178 'pay':2,18,39 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':38 'payload':193 'payment':48,68,112,118 'per':3,13,19,29,40,90 'platform':123 'post':66 'post-endpoint' 'premium':5,21,61,185 'premium API access' 'price':147,170 'prompt':213 'proof':119 'protocol':49 'quot':152 'rate':99,150 'render':208 'report':132 'request':14,30,41,67 'request/response':225 'requir':105 'respons':192 'schema':226 'sentiment':139 'settl':70 'share':165 'simpli':107 'spars':199 'spec':223 'specif':55,173 'summar':142 'technic':217 'text':141 'token':151 'unit':86 'unknown':195 'upfront':102 'usag':230 'usdc':16,32,72,92 'usdc-settlement' 'use':93 'util':157 'valid':116,159 'via':10,26,45 'wallet':212 'web3':146 'x':111 'x-payment':110 'x402':11,27,47,117 'x402 API' 'x402-payment'","prices":[{"id":"a1fe93b3-8201-4566-8a98-561f32b07da4","listingId":"59ef85a7-d032-4c34-9721-ec3ae301fc00","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:42.271Z"}],"sources":[{"listingId":"59ef85a7-d032-4c34-9721-ec3ae301fc00","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:42.271Z","lastSeenAt":"2026-04-23T09:31:17.687Z"}],"details":{"listingId":"59ef85a7-d032-4c34-9721-ec3ae301fc00","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/40 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/40"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/40"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without signup or API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402 payment protocol integration for pay-per-use microservices"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can autonomously pay for API calls via crypto","Users who want zero-commitment, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring high-throughput batch processing with predictable billing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.323Z"},"updatedAt":"2026-04-23T09:31:17.687Z"}}