{"id":"91181887-b7a2-4e83-84d1-09ad5728cc0f","shortId":"RNMTvG","kind":"x402","title":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys needed.","tagline":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys needed.","description":"lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/collections/14` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nDocumentation is extremely thin — the docs, pricing, API, 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. It is unclear what data or functionality the `/collections/14` endpoint specifically returns. The broader site advertises categories like metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation, but none of these map directly to the `/collections/14` path.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","json-response","post-method"],"categories":["api-gateway","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /collections/14","It is unclear what data or functionality the /collections/14 endpoint provides","The broader site lists many endpoint categories but /collections/14 does not map to any named endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/14","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/14","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 works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no clarity on what /collections/14 actually returns. The listing is effectively a 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'/collections/14':192,231 '0.02':9,25,59,121 '000':110 '0x8335':115 '20':109 '2913':116 '300':134 '402':104 '6':125 'Base network API' 'USDC micropayment API' 'accept':139 'access':100 'advertis':199 'ai/ml':49 'analysi':205 'analyt':48 'api':4,20,45,72,99,152 'application/json':144 'attach':83 'avail':179 'base':7,23,67,111,118 'base-network' 'broader':197 'call':44 'caller':81 'categori':200 'challeng':105 'classif':208 'collect':5,21 'commit':80 'connect':160 'content':166 'convers':220 'cost':58 'crawl':182 'crypto-paid API' 'data':47,52,188 'decim':126 'direct':228 'doc':150 'document':145 'embed':209 'endpoint':57,93,138,193 'equal':120 'estim':217 'everi':56 'exact':131 'exampl':178 'exchang':212 'extrem':147 'feed':211 'finance/web3':51 'function':190 'gas':216 'gate':3,19 'generat':222 'geocod':218 'given':122 'header':87 'host':34 'infer':50 'json-response' 'key':15,31,73 'like':201 'limit':76 'list':96 'lowpaymentfee' 'lowpaymentfee.com':33 'map':227 'materi':183 'metric':202 'need':16,32 'network':68 'no-api-key' 'none':224 'openapi':170 'page':155 'path':232 'pay':8,24,42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payment':86,128 'per':10,26,43,60 'post':140 'post-method' 'premium':98 'premium API access' 'price':151,210 'prompt':162 'protocol':40 'quot':215 'rate':75,213 'readm':154 'render':157 'report':203 'request':11,27,61,90,106,141 'request/response':173 'return':102,143,195 'schema':174 'scheme':129 'second':135 'sentiment':204 'servic':55 'settl':62 'simpli':82 'site':198 'span':46 'spec':171 'specif':92,194 'suit':36 'summar':207 'text':206 'thin':148 'timeout':136 'token':214 'unclear':186 'unit':112 'upfront':79 'usag':177 'usdc':13,29,64,114,123 'usdc-settlement' 'util':54 'valid':219 'wallet':161 'x402':2,18,39,85 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"51437d9c-28c4-4eae-8ebb-1348d53b3d5c","listingId":"91181887-b7a2-4e83-84d1-09ad5728cc0f","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T00:29:50.276Z"}],"sources":[{"listingId":"91181887-b7a2-4e83-84d1-09ad5728cc0f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:29:50.276Z","lastSeenAt":"2026-04-22T05:31:55.121Z"}],"details":{"listingId":"91181887-b7a2-4e83-84d1-09ad5728cc0f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/14 \\\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/collections/14"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without creating accounts or managing API keys","Making one-off data or utility requests with per-call USDC micropayments","Integrating x402-compatible agents with low-friction paid endpoints"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents using x402 protocol for autonomous API consumption","Users who prefer pay-as-you-go with no rate limits or commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.043Z"},"updatedAt":"2026-04-22T05:31:55.121Z"}}