{"id":"adec4e6b-cdf9-4d9a-8274-c3771cfc86bd","shortId":"5KSEtQ","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/289` is listed as \"Premium API Access\" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. No API keys or accounts are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 uniformly priced at $0.02 per request. The platform claims no rate limits, no minimums, and instant access.\n\nHowever, documentation 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 schema, no request/response examples, and no description of what the `/api/v1/payments/289` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the actual functionality behind this specific path is unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access","402 payment protocol"],"warnings":["No OpenAPI schema or endpoint documentation available","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no usable content","The specific functionality of /api/v1/payments/289 ('Premium API Access') is not described anywhere","No request body schema or response schema is documented","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/289","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/payments/289","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint path (/api/v1/payments/289) is entirely undocumented. The docs and related pages are empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,80,152 '000':75 '20':74 '402':69,213 '402 payment protocol' 'Base network API' 'USDC pay-per-call' 'accept':46 'access':63,165 'account':88 'actual':206,218 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,62,85,110,173 'attach':93 'base':8,23,51,76 'behind':220 'broader':106 'call':4,19,83 'caller':91 'captur':215 'categori':111 'challeng':70,214 'claim':157 'classif':127 'confirm':211 'connect':182 'convers':144 'crypto API access' 'data':113,117 'descript':200 'detail':189 'doc':172 'document':167 'embed':128 'endpoint':55,147,205,209 'estim':138 'exampl':197 'exchang':133 'export':118 'extrem':169 'feed':132 'financ':129 'function':219 'gas':137 'generat':145 'geocod':142 'header':98 'howev':166 'includ':112 'infrastructur':140 'insight':119 'instant':164 'json-response' 'key':86 'learn':122 'limit':160 'list':59 'live':212 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'micropayment API' 'minimum':162 'multipl':109 'network':9,24,52 'no-api-key' 'openapi':193 'page':177 'path':223 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,97,103 'per':3,18,36,82,153 'platform':6,21,39,107,156 'premium':61 'price':131,150,174 'prompt':184 'proof':104 'protocol':44 'quot':136 'rate':134,159 'readm':176 'render':179 'report':116 'request':37,71,154 'request/response':196 'requir':90 'return':65,207 'schema':194 'sentiment':123 'simpli':92 'spars':170 'specif':54,222 'standard':67 'summar':126 'technic':188 'text':125 'token':135 'unclear':225 'uniform':149 'unit':77 'usd':81 'usdc':15,30,47,79 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':183 'web3':130 'x':96 'x-payment':95 'x402':11,26,43,68,102 'x402 API' 'x402-payment'","prices":[{"id":"caa2c34a-c73a-425a-a908-ec4cf4a33b88","listingId":"adec4e6b-cdf9-4d9a-8274-c3771cfc86bd","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/payments/289","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:20.476Z"}],"sources":[{"listingId":"adec4e6b-cdf9-4d9a-8274-c3771cfc86bd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/289","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:20.476Z","lastSeenAt":"2026-04-24T00:32:11.636Z"}],"details":{"listingId":"adec4e6b-cdf9-4d9a-8274-c3771cfc86bd","quickStartSnippet":"# The endpoint returns HTTP 402 with an x402 challenge.\n# Attach a valid X-PAYMENT header (x402 protocol) to complete the call.\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/289 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/289"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API endpoints without creating an account or managing API keys","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need frictionless, wallet-based API access"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with Base network USDC wallets needing on-demand API calls","Prototyping and low-volume usage where subscription plans are overkill"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users without a Base network wallet or USDC holdings","Anyone needing detailed API documentation or schema guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.393Z"},"updatedAt":"2026-04-24T00:32:11.636Z"}}