{"id":"b3361fce-2233-41b3-b5a4-d4c2e1f98972","shortId":"c3uhrE","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/96 is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, accounts, or rate limits 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 listed at $0.02 per request. However, the specific functionality behind the /api/v1/payments/96 endpoint is not documented beyond its \"Premium API Access\" label, and the crawled docs/pricing/README pages returned only a wallet-connect prompt with no additional content.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with payment details settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The x402 version is 1, the scheme is \"exact\", and the maximum timeout is 300 seconds. No OpenAPI schema, request/response examples, or detailed documentation were found for this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","premium-api-access"],"categories":["api-platform","crypto"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The specific functionality behind /api/v1/payments/96 is undocumented — 'Premium API Access' is the only label provided.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","All documentation pages (docs, pricing, README, api) returned only a wallet-connect prompt with no substantive content.","The platform lists many API categories (AI, analytics, finance, infrastructure) but none are documented in detail; actual capabilities are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/96","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/payments/96 ('Premium API Access') is entirely undescribed. The docs, pricing, and README pages all returned only a wallet-connect prompt with no useful 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'/request':13,28 '0.02':12,27,74,146 '000':68 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':200 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':204 '1':211 '20':67 '300':221 '402':193 '402 payment api' 'accept':46 'access':62,164 'account':80 'addit':180 'address':199 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,78,105,163 'attach':88 'base':8,23,51,69,206 'base network api' 'behind':153 'beyond':160 'broader':101 'call':4,19,76 'caller':86 'categori':106 'challeng':191 'charg':64 'classif':122 'connect':176 'content':181 'contract':203 'convers':139 'crawl':168 'data':108,112 'detail':196,229 'docs/pricing/readme':169 'document':159,230 'embed':123 'endpoint':55,142,156,183,236 'estim':133 'exact':215 'exampl':227 'exchang':128 'export':113 'feed':127 'financ':124 'found':232 'function':152 'gas':132 'generat':140 'geocod':137 'header':93 'howev':149 'http':192 'i.e':73 'includ':107 'infrastructur':135 'insight':114 'key':79 'label':59,165 'learn':117 'limit':83 'list':144 'live':185 'low payment fee' 'lowpaymentfee.com':31 'machin':116 'maximum':218 'metric':110 'micropayment api' 'multipl':104 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':224 'page':170 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,92,98,195 'per':3,18,36,75,147 'platform':6,21,39,102 'premium':60,162 'premium-api-access' 'price':126 'prompt':177 'proof':99 'protocol':44 'quot':131 'rate':82,129 'report':111 'request':37,148 'request/response':226 'requir':85 'return':171,187 'schema':225 'scheme':213 'second':222 'sentiment':118 'settl':197 'simpli':87 'specif':54,151,235 'summar':121 'text':120 'timeout':219 'token':130 'unit':70 'usdc':15,30,47,72,202 'usdc api' 'usdc-base' 'use':41,201 'util':136 'valid':96,138,189 'version':209 'via':10,25 'wallet':175 'wallet-connect':174 'web3':125 'x':91 'x-payment':90 'x402':11,26,43,97,190,208 'x402 api' 'x402-payment'","prices":[{"id":"10f42509-d699-4e41-bc9e-53144ce820a5","listingId":"b3361fce-2233-41b3-b5a4-d4c2e1f98972","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:06.478Z"}],"sources":[{"listingId":"b3361fce-2233-41b3-b5a4-d4c2e1f98972","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/96","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:06.478Z","lastSeenAt":"2026-04-23T23:02:48.074Z"}],"details":{"listingId":"b3361fce-2233-41b3-b5a4-d4c2e1f98972","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a valid payment proof.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/96 \\\n  -H 'Content-Type: application/json'\n# Returns 402 with x402 challenge. Attach a valid X-PAYMENT header to complete.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/96"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/96"},{"claim":"Platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402 protocol users settling in USDC on Base","Low-commitment API usage with no minimums or subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Use cases requiring known, well-documented response schemas","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.04Z"},"updatedAt":"2026-04-23T23:02:48.074Z"}}