{"id":"c80bf972-c726-46a8-8cdb-6e5610a7be74","shortId":"TF2dSb","kind":"x402","title":"Pay-per-request API collection on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request API collection on Base via x402 — $0.02/call in USDC, no API keys required.","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/collections/36` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe broader platform offers 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 endpoints are listed at the same $0.02/request price point.\n\nThe platform advertises no API keys, no rate limits, no minimums, and instant access. Payment is handled entirely through the x402 protocol's X-PAYMENT header mechanism on the Base L2 network. Documentation pages beyond the landing page appear to require wallet connection and were not crawlable, so detailed request/response schemas for this specific collection endpoint are unavailable.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","data","llm"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","lowpaymentfee","crypto-paid API","serverless API marketplace"],"warnings":["No OpenAPI or request/response schema available for this endpoint","Documentation, pricing, API, and README pages all return only 'Connect wallet' — no substantive docs crawlable","The specific function of /api/v1/collections/36 is unclear; 'Premium API Access' is a generic label","No rate limit or SLA information available","No information on what data or functionality this specific collection endpoint returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/36","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/collections/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages are gated behind wallet connection. The specific purpose of '/api/v1/collections/36' beyond 'Premium API Access' is unclear — it may be a bundle or a specific resource. This is effectively a stub 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'/call':12,30 '/request':151 '0.02':11,29,99,150 '000':89 '0x8335':77 '20':88 '2913':78 '6':94 'Base network API' 'USDC API' 'accept':69 'access':48,67,167 'across':107 'advertis':84,156 'ai':117 'ai-inference' 'analysi':121 'analyt':111 'api':5,16,23,34,46,66,158 'appear':193 'base':8,26,56,80,90,184 'base-network' 'beyond':189 'broader':103 'categori':109 'challeng':83 'classif':124 'classification' 'collect':6,24,40,209 'connect':197 'contract':76 'convers':141 'crawlabl':201 'crypto-paid API' 'data':110,114 'data-analytics' 'decim':95 'detail':203 'document':187 'embed':125 'embeddings' 'endpoint':47,60,106,144,210 'entir':171 'equal':98 'estim':135 'exchang':130 'export':115 'feed':129 'financ':126 'finance-data' 'four':108 'gas':134 'generat':142 'geocod':139 'geocoding' 'handl':170 'header':180 'host':38 'infrastructur':137 'insight':116 'instant':166 'key':17,35,159 'l2':185 'label':64 'land':191 'learn':119 'limit':162 'list':146 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':118 'maxamountrequir':86 'mechan':181 'metric':112 'micropayment API' 'minimum':164 'network':57,186 'no-api-key' 'offer':105 'page':188,192 'pay':2,20,43 'pay-per-call API' 'pay-per-request':1,19,42 'payment':52,73,168,179 'per':3,21,44,100 'per-request-billing' 'platform':104,155 'point':153 'post':70 'premium':65 'price':128,152 'protocol':53,175 'quot':133 'rate':131,161 'report':113 'request':4,22,45,71,101 'request/response':204 'requir':18,36,195 'schema':205 'sentiment':120 'sentiment-analysis' 'serverless API marketplace' 'settl':72 'specif':59,208 'summar':123 'text':122 'text-summarization' 'token':132 'unavail':212 'unit':91 'usdc':14,32,75,97 'usdc-settlement' 'util':138 'utility-apis' 'valid':140 'via':9,27,49 'wallet':196 'web3':127 'x':178 'x-payment':177 'x402':10,28,51,82,174 'x402 API' 'x402-payment'","prices":[{"id":"34174967-ba4f-445b-9e10-6ac16fb1691c","listingId":"c80bf972-c726-46a8-8cdb-6e5610a7be74","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/collections/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:56.448Z"}],"sources":[{"listingId":"c80bf972-c726-46a8-8cdb-6e5610a7be74","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:56.448Z","lastSeenAt":"2026-04-22T07:01:49.990Z"}],"details":{"listingId":"c80bf972-c726-46a8-8cdb-6e5610a7be74","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/36 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/36"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC extra field identifies the asset as 'USD Coin' version 2","source_url":"https://lowpaymentfee.com/api/v1/collections/36"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without managing API keys or subscriptions","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with pay-as-you-go pricing","Using utility services like geocoding and validation from an agent that can settle x402 payments"],"bestFor":["AI agents that need on-demand access to diverse API endpoints via crypto micropayments","Developers who want to avoid API key management and subscription commitments","Applications on Base that need low-cost, per-request utility and data services"],"notFor":["Users who need high-volume bulk access at discounted rates (flat $0.02/request with no volume tiers mentioned)","Applications that cannot settle payments in USDC on the Base network","Users who need detailed API documentation before integrating (docs pages require wallet connection and are sparse)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.296Z"},"updatedAt":"2026-04-22T07:01:49.990Z"}}