{"id":"bab20e58-3e59-48a1-9ed7-7fa4407aa98a","shortId":"HZW65w","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or subscriptions required. The x402 payment protocol handles authentication and billing inline: callers attach a cryptographic payment header and receive the response immediately.\n\nThe specific endpoint at `/api/v1/messages/86` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform also advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, no OpenAPI schema, request/response examples, or detailed documentation were found for any endpoint, including this one. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. Without schemas or sample payloads, it is unclear what request body this endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","messages-api"],"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":["No OpenAPI or schema documentation available for any endpoint","No request body or response format documented — callers must guess the payload","Docs, pricing, and README pages return no useful content (only 'Connect wallet')","The specific function of /api/v1/messages/86 ('Premium API Access') is unclear and may be a generic placeholder","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/86","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/messages/86","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, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs/pricing/README pages are all blank beyond a wallet-connect prompt. The purpose of '/api/v1/messages/86' specifically is entirely 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'/request':11,26 '0.02':10,25,61,135,182 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':129 '20':123 '2913':130 '300':150 '402 payment api' '6':139 'accept':112 'access':110 'address':146 'advertis':118,156 'ai/ml':49 'also':155 'amount':121 'analysi':160 'analyt':48 'api':5,20,37,73,109 'attach':90 'authent':85 'base':8,23,69,125,132 'base network api' 'bill':87 'bodi':230 'broad':42 'call':4,19 'caller':89 'catalog':43 'challeng':117 'classif':163 'connect':213 'content':219 'convers':175 'crawl':203 'cryptograph':92 'data':47,52 'decim':140 'detail':192 'doc':204 'document':193 'embed':164 'enabl':36 'endpoint':45,57,102,157,198,232 'equal':134 'estim':172 'everi':56 'exampl':190 'exchang':167 'expect':233 'feed':166 'finance/web3':51 'found':195 'gas':171 'generat':177 'geocod':173 'given':136 'handl':84 'header':94 'howev':185 'immedi':99 'includ':199 'infer':50 'infrastructur':54 'inlin':88 'key':74 'limit':76 'list':106 'low payment fee' 'lowpaymentfee.com':31 'max':120 'messages-api' 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'one':201 'openapi':187 'page':208 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':64 'payload':224 'payment':15,30,82,93,142 'per':3,18,62 'platform':6,21,38,154 'point':184 'post':113 'post-endpoint' 'premium':108 'price':59,165,183,205 'prompt':215 'protocol':83 'quot':170 'rate':75,168 'readm':207 'receiv':96 'request':63,114,229 'request/response':189 'requir':79 'respons':98 'return':210,237 'sampl':223 'schema':188,221 'second':151 'sentiment':159 'settl':144 'span':46 'specif':101 'subscript':78 'summar':162 'text':161 'timeout':152 'token':169 'unclear':227 'unit':126 'usdc':14,29,66,128,137 'usdc api' 'usdc-base-network' 'util':55 'valid':174 'via':12,27 'wallet':214 'without':220 'x402':13,28,35,81,116 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"3d5c5a6b-0b00-41c4-95c4-fc9626ef5840","listingId":"bab20e58-3e59-48a1-9ed7-7fa4407aa98a","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/messages/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.251Z"}],"sources":[{"listingId":"bab20e58-3e59-48a1-9ed7-7fa4407aa98a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.251Z","lastSeenAt":"2026-04-22T02:32:08.339Z"}],"details":{"listingId":"bab20e58-3e59-48a1-9ed7-7fa4407aa98a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/86 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/86"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/messages/86"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-initiated API calls with inline USDC micropayments","Accessing premium content or data behind a per-request paywall","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can sign USDC transactions on Base","Low-volume, pay-as-you-go API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who need bulk pricing or rate guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.715Z"},"updatedAt":"2026-04-22T02:32:08.339Z"}}