{"id":"162c0d32-bea7-4e85-86c1-c27101301061","shortId":"LDndbj","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. This specific endpoint (`/api/v1/generate/resource/4`) is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a cost of $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises 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 priced uniformly at $0.02 per request.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, 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 example payloads available. The specific functionality behind `/api/v1/generate/resource/4` (labeled \"Premium API Access\") is unclear — it does not map obviously to any of the named endpoints on the landing page. Callers should expect to experiment or contact the provider for details on what this endpoint actually returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI spec or schema documentation available","The /docs, /pricing, /api, and /README pages all return only a 'Connect wallet' prompt with no technical content","The specific functionality of /api/v1/generate/resource/4 ('Premium API Access') is not described anywhere — it does not correspond to any named endpoint on the landing page","No request body schema or response schema is documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific resource path is ambiguous. Effectively a stub 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'/api/v1/generate/resource/4':55,205 '/docs':169 '/pricing':170 '/readme':173 '/request':13,28 '0.02':12,27,80,161 '000':84 '0x8335':72 '20':83 '2913':73 '6':88 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,61,209 'across':119 'actual':242 'advertis':117 'ai':129 'analysi':133 'analyt':123 'api':6,21,40,60,91,208 'attach':102 'avail':200 'base':9,24,50,75,85 'base-network' 'behind':204 'broader':115 'call':4,19,82 'caller':100,227 'categori':121 'classif':136 'commit':97 'connect':179 'contact':233 'contract':71 'convers':153 'cost':78 'crypto-paid API' 'data':122,126 'decim':89 'detail':186,237 'document':164,195 'embed':137 'endpoint':41,54,118,156,222,241 'estim':147 'exampl':198 'exchang':142 'expect':229 'experi':231 'export':127 'extrem':166 'feed':141 'financ':138 'four':120 'function':203 'gas':146 'gate':42 'generat':154 'geocod':151 'header':107 'infrastructur':149 'insight':128 'key':92 'label':206 'land':225 'learn':131 'limit':94 'list':57 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':130 'map':215 'metric':124 'name':221 'network':51 'no-api-key' 'obvious':216 'offer':32 'openapi':190 'page':174,226 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payload':199 'payment':46,66,106,112 'per':3,18,38,81,162 'platform':116 'post':64 'post-endpoint' 'premium':5,20,59,207 'premium API access' 'price':140,158 'prompt':181 'proof':113 'protocol':47 'provid':235 'quot':145 'rate':93,143 'render':176 'report':125 'request':39,65,163 'request/response':193 'requir':99 'return':243 'schema':194 'sentiment':132 'settl':68 'simpli':101 'spars':167 'spec':191 'specif':53,202 'suit':34 'summar':135 'technic':185 'text':134 'token':144 'unclear':211 'uniform':159 'unit':86 'upfront':96 'usdc':15,30,70 'usdc-settlement' 'util':150 'valid':110,152 'via':10,25 'wallet':180 'web3':139 'x':105 'x-payment':104 'x402':11,26,45,111 'x402 API' 'x402-payment'","prices":[{"id":"6dcf7cd7-1897-4ed0-9d88-4051858e9d0f","listingId":"162c0d32-bea7-4e85-86c1-c27101301061","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:22.154Z"}],"sources":[{"listingId":"162c0d32-bea7-4e85-86c1-c27101301061","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:22.154Z","lastSeenAt":"2026-04-24T11:31:44.654Z"}],"details":{"listingId":"162c0d32-bea7-4e85-86c1-c27101301061","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/4 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/4"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across 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/generate/resource/4"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to utility/generation endpoints paid per call in USDC","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.181Z"},"updatedAt":"2026-04-24T11:31:44.654Z"}}