{"id":"1c7d9959-ae78-4980-ba23-03e01e37e99f","shortId":"wn2t3D","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 endpoint at `/api/v1/collections/24` is labeled \"Premium API Access\" and accepts POST requests with payment 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 $0.02 per request. The platform advertises no API keys, no rate limits, no minimums, and instant access.\n\nThis specific endpoint (`/collections/24`) does not have detailed documentation beyond the \"Premium API Access\" label. The docs, pricing, and API pages on the site returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no example request/response documentation, and no description of what data or functionality this particular collection endpoint returns. The endpoint is live (returns a valid 402 challenge), but the lack of documentation makes it difficult to know exactly what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-marketplace","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Docs, pricing, and API pages return only 'Connect wallet' with no substantive content","The exact functionality and expected request/response format of /api/v1/collections/24 is undocumented","Cannot verify what 'Premium API Access' actually provides beyond the label"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/24","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/24","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 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a label, and the docs/pricing/API pages are empty (wallet-connect only). The specific functionality of /collections/24 is 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'/call':12,30 '/collections/24':167 '0.02':11,29,98,147 '000':88 '0x8335':76 '20':87 '2913':77 '402':227 '6':93 'Base network API' 'USDC micropayment API' 'accept':68 'access':48,66,163,177 'across':106 'addit':196 'advertis':83,152 'ai':116 'analysi':120 'analyt':110 'api':5,16,23,34,46,65,154,176,183 'base':8,26,56,79,89 'base-network' 'beyond':173 'broader':102 'categori':108 'challeng':82,228 'classif':123 'collect':6,24,40,217 'connect':191 'content':197 'contract':75 'convers':140 'crypto-paid API' 'data':109,113,212 'decim':94 'descript':209 'detail':171 'difficult':236 'doc':180 'document':172,206,233 'embed':124 'endpoint':47,59,105,143,166,218,221 'equal':97 'estim':134 'exact':239 'exampl':204 'exchang':129 'expect':248 'export':114 'feed':128 'financ':125 'four':107 'function':214 'gas':133 'generat':141 'geocod':138 'host':38 'infrastructur':136 'insight':115 'instant':162 'key':17,35,155 'know':238 'label':63,178 'lack':231 'learn':118 'limit':158 'list':145 'live':223 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':117 'make':234 'maxamountrequir':85 'metric':111 'minimum':160 'network':57 'no-api-key' 'offer':104 'openapi':201 'page':184 'particular':216 'pay':2,20,43 'pay-per-call API' 'pay-per-request':1,19,42 'payload':241 'payment':52,72 'per':3,21,44,99,148 'platform':103,151 'post':69 'post-endpoint' 'premium':64,175 'premium API access' 'price':127,181 'prompt':193 'protocol':53 'quot':132 'rate':130,157 'report':112 'request':4,22,45,70,100,149 'request/response':205 'requir':18,36 'respons':246 'return':188,219,224 'schema':202 'send':243 'sentiment':119 'site':187 'specif':165 'summar':122 'text':121 'token':131 'unit':90 'usdc':14,32,74,96 'usdc-settlement' 'util':137 'valid':139,226 'via':9,27,49 'wallet':192 'web3':126 'x402':10,28,51,81 'x402 API' 'x402-payment'","prices":[{"id":"d861f6b8-1379-44df-85f6-78e410c1bebc","listingId":"1c7d9959-ae78-4980-ba23-03e01e37e99f","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T22:29:47.120Z"}],"sources":[{"listingId":"1c7d9959-ae78-4980-ba23-03e01e37e99f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T22:29:47.120Z","lastSeenAt":"2026-04-22T09:01:57.407Z"}],"details":{"listingId":"1c7d9959-ae78-4980-ba23-03e01e37e99f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/24 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/24"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/24"},{"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"},{"claim":"Docs, pricing, and API pages returned only 'Connect wallet' content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to a curated API collection"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.278Z"},"updatedAt":"2026-04-22T09:01:57.407Z"}}