{"id":"aea2a524-5fc4-462c-b749-af4375806a8a","shortId":"sE9Kn5","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each request costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/wire/37` is listed as \"Premium API Access\" and accepts HTTP POST requests. Payment is settled on-chain via the x402 exact-payment scheme using USDC (contract 0x8335…2913) on Base. The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units (i.e., $0.02 USDC at 6 decimals) per call with a 300-second payment timeout.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/wire/37` endpoint specifically returns. The landing page lists many endpoints but does not clarify what \"wire/37\" maps to in the catalog. Prospective callers should be aware that without documentation, the actual behavior and output of this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","http-post","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-request API","USDC micropayment API","Base network API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The endpoint path /api/v1/wire/37 is not listed among the catalog endpoints on the landing page; its specific function is unknown.","No OpenAPI schema, no request body schema, and no response examples are provided.","Output behavior is entirely unknown — callers cannot predict what data this endpoint returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/37","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/wire/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on what this specific endpoint does, no request/response schema, and no examples. The docs pages are empty. The endpoint path '/api/v1/wire/37' does not clearly map to any listed API 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'/request':13,28 '0.02':12,27,86,157 '000':153 '0x8335':136 '20':152 '2913':137 '300':166 '6':160 'Base network API' 'USDC micropayment API' 'accept':116 'access':7,22,38,114 'actual':236 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,95,113,177 'awar':231 'base':9,24,91,139,154 'behavior':237 'broad':48 'call':4,19,54,163 'caller':228 'catalog':49,226 'chain':125 'challeng':142 'clarifi':219 'classif':64 'commit':103 'confirm':143 'connect':185 'content':191 'contract':135 'convers':81 'cost':85 'data':57 'decim':161 'descript':202 'doc':175 'document':170,234 'embed':65 'endpoint':32,107,145,207,215,242 'estim':75 'exact':130 'exact-pay':129 'exampl':199 'exchang':70 'extrem':172 'feed':69 'financ':66 'gas':74 'generat':82 'geocod':79 'host':46 'http':117 'http-post' 'i.e':156 'infer':60 'infrastructur':77 'key':96 'land':211 'limit':99 'list':110,213 'live':147 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'mani':214 'map':222 'maximum':150 'minimum':102 'network':92 'no-api-key' 'no-rate-limit' 'on-chain':123 'openapi':195 'output':239 'page':180,212 'pay':2,17,52 'pay-per-cal':1,16,51 'pay-per-call' 'pay-per-request API' 'payment':42,120,131,168 'per':3,18,53,162 'post':118 'premium':5,20,36,112 'price':68,176 'prompt':187 'prospect':227 'protocol':43 'provid':35 'quot':73 'rate':71,98 'readm':179 'render':182 'request':84,119,148 'request/response':198 'requir':104 'return':209 'schema':196 'scheme':132 'second':167 'sentiment':61 'settl':122 'site':45 'span':56 'spars':173 'specif':106,208 'summar':63 'timeout':169 'token':72 'unit':155 'unknown':244 'usdc':15,30,88,134,158 'usdc-base' 'use':133 'util':78 'valid':80 'via':10,25,39,126 'wallet':186 'web3':67 'wire/37':221 'without':233 'x402':11,26,41,128,141 'x402 premium API' 'x402-payment'","prices":[{"id":"d8ba17bb-628b-46be-baf1-328005b66340","listingId":"aea2a524-5fc4-462c-b749-af4375806a8a","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/wire/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:56.176Z"}],"sources":[{"listingId":"aea2a524-5fc4-462c-b749-af4375806a8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:56.176Z","lastSeenAt":"2026-04-22T13:32:00.071Z"}],"details":{"listingId":"aea2a524-5fc4-462c-b749-af4375806a8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/37 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/wire/37","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms USDC payment on Base with maxAmountRequired of 20000 base units (=$0.02) and 300s timeout.","source_url":"https://lowpaymentfee.com/api/v1/wire/37"}],"useCases":["Programmatic access to premium API services paid per-call with USDC on Base","Agent-driven workflows that need keyless, on-demand API access","Micropayment-gated API consumption without subscriptions or accounts"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over traditional API billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring free or fiat-billed API access","High-volume batch processing where per-call pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.709Z"},"updatedAt":"2026-04-22T13:32:00.071Z"}}