{"id":"a934e1eb-aee6-4113-8830-149a6cc2ac5a","shortId":"hGertN","kind":"x402","title":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific resource at `/api/v1/generate/resource/141` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The endpoint accepts HTTP POST and returns `application/json`.\n\nThe broader platform advertises several endpoint 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 with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation beyond the landing page 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 crawl. The actual functionality behind `/api/v1/generate/resource/141` (what it generates, what inputs it expects) is not documented anywhere in the crawled material, making it difficult to determine what this specific endpoint does beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["infrastructure","general"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available for request parameters or response schema for this endpoint","The purpose of /api/v1/generate/resource/141 ('Premium API Access') is not explained anywhere","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","No OpenAPI or machine-readable schema is published","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/141","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/generate/resource/141","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request parameters or response format, and no examples. The specific purpose of resource/141 is undocumented. The docs/pricing/README pages are all empty beyond a wallet connect 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'/api/v1/generate/resource/141':58,199 '/docs':160 '/pricing':162 '/readme':164 '/request':16,32 '0.02':15,31,80,136 '000':74 '20':73 '402 payment endpoint' 'Base network API' 'USDC micropayment API' 'accept':85 'access':64,230 'actual':196 'advertis':94 'ai':9,25,105 'analysi':109 'analyt':8,24,99 'anywher':210 'api':4,20,45,63,141,229 'application/json':90 'avail':191 'base':7,23,52,75 'base-network' 'behind':198 'beyond':152,225 'broader':92 'call':44,82 'categori':97 'challeng':69 'classif':112 'collect':36 'commit':149 'connect':170 'convers':129 'crawl':194,213 'crypto-paid API' 'data':98,102 'detail':177 'determin':219 'difficult':217 'document':151,186,209 'embed':113 'endpoint':13,29,46,84,96,132,223 'estim':123 'exampl':190 'exchang':118 'expect':206 'export':103 'extrem':157 'feed':117 'financ':10,26,114 'function':197 'gas':122 'generat':130,202 'generic':227 'geocod':127 'host':34 'http':86 'http-post' 'i.e':79 'infrastructur':125 'input':204 'insight':104 'json-response' 'key':142 'label':231 'land':154 'learn':107 'limit':145 'list':60,134 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':106 'make':215 'materi':214 'metric':100 'minimum':148 'network':53 'openapi':181 'page':155,165 'pay':42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payabl':3,19 'per':43,81,137 'platform':93 'post':87 'premium':62,228 'price':116 'prompt':172 'protocol':40 'quot':121 'rate':119,144 'render':167 'report':101 'request':70,138 'request/response':184 'requir':150 'resourc':56 'return':66,89 'schema':185 'sentiment':108 'settl':47 'sever':95 'spars':158 'spec':182 'specif':55,222 'suit':5,21 'summar':111 'technic':176 'text':110 'token':120 'unit':76 'usag':189 'usdc':49,78 'usdc-settlement' 'util':12,28,126 'valid':128 'wallet':171 'web3':115 'x402':2,18,39,68 'x402 API' 'x402-payable':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"5c1dbb8e-95e0-4a80-b0e1-c6f58ee2c60f","listingId":"a934e1eb-aee6-4113-8830-149a6cc2ac5a","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/generate/resource/141","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:07.360Z"}],"sources":[{"listingId":"a934e1eb-aee6-4113-8830-149a6cc2ac5a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/141","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:07.360Z","lastSeenAt":"2026-04-22T12:00:38.057Z"}],"details":{"listingId":"a934e1eb-aee6-4113-8830-149a6cc2ac5a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/141 \\\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 an x402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/141"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/141"}],"useCases":["Programmatic access to a pay-per-call generation endpoint without API key management","Agent-driven workflows that need on-demand API access settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, pay-per-request API access","Low-cost per-call usage without subscriptions or commitments"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.88Z"},"updatedAt":"2026-04-22T12:00:38.057Z"}}