{"id":"4033478a-2158-4de6-9437-f3d308fa7e14","shortId":"bjD5rK","kind":"x402","title":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","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/11` 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 listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 schema, no request/response examples, and no description of what the `/collections/11` endpoint specifically returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality this particular collection endpoint provides.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-method","no-api-key","pay-per-use"],"categories":["api-marketplace","data"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","crypto-paid API","serverless API billing"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /collections/11","Unknown what data or functionality the /collections/11 endpoint actually provides","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/11","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/11","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 with clear pricing. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what /collections/11 actually returns. The listing is essentially a stub with confirmed 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'/call':19,38 '/collections/11':202 '0.02':18,37,101,150 '000':91 '0x8335':79 '20':90 '2913':80 '402':213 '6':96 'Base network API' 'USDC API' 'accept':71 'access':50,69 'across':109 'advertis':86 'ai':12,31,119 'analysi':123 'analyt':113 'api':5,24,48,68,155,171 'base':8,27,58,82,92 'base-network' 'broader':105 'categori':111 'challeng':85,214 'classif':126 'collect':6,25,42,227 'commit':163 'connect':180 'contract':78 'convers':142 'crypto-paid API' 'data':11,30,112,116,222 'decim':97 'descript':198 'detail':187 'doc':170 'document':165,217 'embed':127 'endpoint':16,35,49,62,108,146,203,207,228 'equal':100 'estim':137 'exampl':195 'exchang':132 'export':117 'extrem':167 'feed':131 'financ':13,32,128 'four':110 'function':224 'gas':136 'generat':143 'geocod':140 'host':40 'infrastructure/utilities':139 'insight':118 'key':156 'label':66 'learn':121 'limit':159 'list':145 'live':209 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':120 'maxamountrequir':88 'metric':114 'micropayment API' 'minimum':162 'network':59 'no-api-key' 'offer':107 'openapi':191 'page':175 'particular':226 'pay':2,21,45 'pay-per-call API' 'pay-per-request':1,20,44 'pay-per-use' 'payment':54,75 'per':3,22,46,102,151 'per-request-billing' 'platform':106 'post':72 'post-method' 'premium':67 'price':130,148,172 'prompt':182 'protocol':55 'provid':229 'quot':135 'rate':133,158 'readm':174 'render':177 'report':115 'request':4,23,47,73,103,152 'request/response':194 'requir':164 'return':205,210 'schema':192 'sentiment':122 'serverless API billing' 'settl':74 'spars':168 'specif':61,204 'summar':125 'technic':186 'text':124 'token':134 'unclear':220 'unit':93 'usdc':77,99 'usdc-settlement' 'util':15,34 'valid':141,212 'via':9,28,51 'wallet':181 'web3':129 'without':216 'x402':10,29,53,84 'x402 API' 'x402-payment'","prices":[{"id":"f82e2800-1e72-43c8-b7b7-b84fa9d98340","listingId":"4033478a-2158-4de6-9437-f3d308fa7e14","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T00:29:51.489Z"}],"sources":[{"listingId":"4033478a-2158-4de6-9437-f3d308fa7e14","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:29:51.489Z","lastSeenAt":"2026-04-22T09:01:57.726Z"}],"details":{"listingId":"4033478a-2158-4de6-9437-f3d308fa7e14","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/11 \\\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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/11"},{"claim":"All 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 in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/11"}],"useCases":["Accessing premium data or analytics without subscription commitments","Making one-off API calls settled instantly in USDC on Base","Agent-driven workflows that need keyless, pay-per-request API access"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native billing without API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.915Z"},"updatedAt":"2026-04-22T09:01:57.726Z"}}