{"id":"03bf3d27-16ed-4925-a445-82bd61a15da0","shortId":"hQ48gp","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/orders/62` 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 lists 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. The platform advertises no API keys, no rate limits, and instant access.\n\nHowever, the specific `/api/v1/orders/62` endpoint's purpose is unclear — it does not map to any of the documented API categories on the landing page. There is no OpenAPI schema, no detailed documentation (the /docs, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content), and no request/response examples are available. The endpoint is live and returns a valid x402 402 challenge, but the actual functionality behind this particular order endpoint remains unspecified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key"],"categories":["api-gateway","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["The specific endpoint /api/v1/orders/62 does not correspond to any documented API on the landing page — its actual functionality is unknown.","No OpenAPI schema or detailed documentation is available; /docs, /pricing, and /README pages return only 'Connect wallet' with no content.","No request body schema or response examples are documented anywhere.","The platform's advertised endpoints (AI, analytics, finance, utils) are at different paths and may behave differently from this orders endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/62","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/orders/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and the specific /api/v1/orders/62 endpoint's functionality is undocumented. The docs, pricing, and README pages are all empty 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'/call':13,28 '/docs':190 '/pricing':191 '/readme':193 '0.02':12,27,92,142 '000':82 '0x8335':70 '20':81 '2913':71 '402':221 '402 payment endpoint' '6':87 'Base network API' 'USDC micropayment API' 'accept':62 'access':7,22,60,156 'across':100 'actual':225 'advertis':77,147 'ai':110 'analysi':114 'analyt':104 'api':6,21,40,59,149,175 'avail':211 'base':9,24,49,73,83 'behind':227 'broader':96 'categori':102,176 'challeng':76,222 'classif':117 'connect':199 'content':205 'contract':69 'convers':134 'crypto-paid API' 'data':103,107 'decim':88 'detail':187 'document':174,188 'embed':118 'endpoint':41,53,99,137,161,213,231 'equal':91 'estim':128 'exampl':209 'exchang':123 'export':108 'feed':122 'financ':119 'four':101 'function':226 'gas':127 'gate':42 'generat':135 'geocod':132 'howev':157 'infrastructur':130 'insight':109 'instant':155 'key':150 'label':57 'land':179 'learn':112 'limit':153 'list':98 'live':215 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':111 'map':169 'maxamountrequir':79 'metric':105 'network':50 'no-api-key' 'offer':32 'openapi':184 'order':230 'page':180,194 'particular':229 'pay':2,17,37 'pay-per-call API' 'pay-per-request':1,16,36 'payment':66 'per':3,18,38,93,143 'platform':97,146 'post':63 'post-endpoint' 'premium':5,20,58 'price':121,139 'prompt':201 'protocol':46 'purpos':163 'quot':126 'rate':124,152 'remain':232 'report':106 'request':4,19,39,64,94,144 'request/response':208 'return':196,217 'schema':185 'sentiment':113 'specif':52,159 'substant':204 'suit':34 'summar':116 'text':115 'token':125 'unclear':165 'uniform':140 'unit':84 'unspecifi':233 'usdc':15,30,68,90 'usdc-base' 'util':131 'valid':133,219 'via':10,25 'wallet':200 'web3':120 'x402':11,26,45,75,220 'x402 API' 'x402-payment'","prices":[{"id":"1e3c18b0-6212-4ad8-8144-5747500f289a","listingId":"03bf3d27-16ed-4925-a445-82bd61a15da0","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/orders/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:43.976Z"}],"sources":[{"listingId":"03bf3d27-16ed-4925-a445-82bd61a15da0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:43.976Z","lastSeenAt":"2026-04-22T13:30:28.263Z"}],"details":{"listingId":"03bf3d27-16ed-4925-a445-82bd61a15da0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/62 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/62"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/62"},{"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 lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /pricing, and /README pages contain only a 'Connect wallet' prompt with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API resources with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"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","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.862Z"},"updatedAt":"2026-04-22T13:30:28.263Z"}}