{"id":"941b98ee-b34b-4b23-9f11-de9d4caed6bb","shortId":"QGz5U6","kind":"x402","title":"Pay-per-call premium API access via x402 on Base, $0.02/request in USDC.","tagline":"Pay-per-call premium API access via x402 on Base, $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/secrets` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (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 lowpaymentfee.com platform advertises additional 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 are listed at the same $0.02/request price point.\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 exact nature of what `/api/v1/secrets` returns is not documented anywhere in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The exact purpose and response format of /api/v1/secrets is unknown","No request body schema documented; callers must guess at input format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/secrets","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/secrets","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 zero documentation on request/response schemas, no OpenAPI spec, and the /docs pages are empty. The purpose of /api/v1/secrets is undocumented, making this effectively a stub 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'/api/v1/secrets':56,217 '/docs':177 '/pricing':179 '/readme':181 '/request':13,28,165 '0.02':12,27,81,164 '000':85 '0x8335':72 '20':84 '2913':73 '6':89 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,61 'across':122 'addit':120 'advertis':119 'ai':132 'analysi':136 'analyt':126 'anywher':222 'api':6,21,40,60,92 'attach':103 'avail':208 'base':11,26,50,75,86 'base-network' 'beyond':169 'broader':116 'call':4,19 'caller':101 'categori':124 'classif':139 'collect':34 'commit':98 'connect':187 'contract':71 'convers':156 'cost':79 'crawl':211,225 'crypto-paid endpoint' 'data':125,129 'decim':90 'detail':194 'document':168,203,221 'embed':140 'endpoint':41,54,121 'estim':150 'exact':213 'exampl':207 'exchang':145 'export':130 'extrem':174 'feed':144 'financ':141 'four':123 'gas':149 'gate':42 'generat':157 'geocod':154 'header':108 'host':32 'infrastructur':152 'insight':131 'key':93 'label':58 'land':171 'learn':134 'limit':95 'list':160 'lowpaymentfee' 'lowpaymentfee.com':31,117 'machin':133 'materi':226 'maximum':78 'metric':127 'natur':214 'network':51 'no-api-key' 'openapi':198 'page':172,182 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,107,113 'per':3,18,38,82 'platform':118 'point':167 'post':64 'post-endpoint' 'premium':5,20,59 'premium API access' 'price':143,166 'prompt':189 'proof':114 'protocol':47 'quot':148 'rate':94,146 'render':184 'report':128 'request':39,65,83 'request/response':201 'requir':100 'return':218 'schema':202 'sentiment':135 'settl':68 'simpli':102 'spars':175 'spec':199 'specif':53 'summar':138 'technic':193 'text':137 'token':147 'unit':87 'upfront':97 'usag':206 'usdc':15,30,70 'usdc-settlement' 'util':153 'valid':111,155 'via':8,23 'wallet':188 'web3':142 'x':106 'x-payment':105 'x402':9,24,45,112 'x402 API' 'x402-payment'","prices":[{"id":"2d6ce8a8-40c7-454b-b506-6e03e759b696","listingId":"941b98ee-b34b-4b23-9f11-de9d4caed6bb","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/secrets","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:10.852Z"}],"sources":[{"listingId":"941b98ee-b34b-4b23-9f11-de9d4caed6bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/secrets","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:10.852Z","lastSeenAt":"2026-04-24T11:31:38.521Z"}],"details":{"listingId":"941b98ee-b34b-4b23-9f11-de9d4caed6bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/secrets \\\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 accepting USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/secrets"},{"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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/secrets"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium data endpoint without creating an account or obtaining API keys","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents with Base USDC wallets needing frictionless API access","Low-volume, pay-as-you-go API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","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":"2026-02-17T23:14:51.486Z"},"updatedAt":"2026-04-24T11:31:38.521Z"}}