{"id":"4d317961-71bc-4cb1-adeb-03cfe6a2f80a","shortId":"PQqkD9","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/messages/36` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6-decimal precision. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including 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 during the crawl; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without schemas or sample payloads, it is unclear what request body this particular endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-settlement","base-network","post-endpoint","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages returned no useful content beyond 'Connect wallet'","The specific function of /api/v1/messages/36 ('Premium API Access') is undocumented — it is unclear what request body it expects or what it returns","The platform lists many endpoint categories but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/36","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, and the landing page confirms the pricing model. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the /api, /pricing, and /README pages are all blank beyond a wallet-connect prompt. The purpose of this specific endpoint (/api/v1/messages/36) is entirely 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'/api/v1/messages/36':103 '/pricing':202 '/readme':204 '/request':18,36 '0.02':17,35,68,134,183 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':128 '20':122 '2913':129 '300':150 '6':138 'accept':111 'access':109 'addit':157 'address':146 'advertis':117,156 'ai':12,30,55 'analysi':161 'analyt':54 'api':5,23,43,81,108 'attach':92 'base':8,26,76,124,131 'base network api' 'base-network' 'bodi':227 'broad':48 'broader':154 'call':4,22 'caller':90 'catalog':49 'challeng':116 'classif':164 'commit':89 'connect':210 'content':216 'convers':176 'cost':120 'cover':10,28 'crawl':199 'data':11,29,53 'decim':139 'detail':193 'document':194 'embed':165 'enabl':42 'endpoint':51,64,102,158,230 'equal':133 'estim':173 'everi':63 'exampl':191 'exchang':168 'expect':231 'feed':167 'financ':13,31,58 'found':196 'gas':172 'generat':178 'geocod':174 'given':135 'header':96 'howev':186 'includ':159 'infrastructur':61 'key':82 'learn':57 'limit':85 'list':105 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'maximum':119 'micropayment api' 'minimum':88 'network':77 'no-api-key' 'no-rate-limit' 'offer':46 'openapi':188 'page':205 'particular':229 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'payload':221 'payment':95,142 'per':3,21,69 'per-call-pricing' 'platform':44,155 'point':185 'post':112 'post-endpoint' 'precis':140 'premium':107 'price':66,166,184 'prompt':212 'quot':171 'rate':84,169 'request':70,99,113,226 'request/response':190 'return':207,235 'sampl':220 'schema':189,218 'second':151 'sent':144 'sentiment':160 'settl':71 'simpli':91 'span':52 'specif':101 'substant':215 'suit':6,24 'summar':163 'text':162 'timeout':152 'token':170 'unclear':224 'unit':125 'usdc':9,27,73,127,136 'usdc api' 'usdc-settlement' 'util':15,33,62 'valid':175 'wallet':211 'web3':59 'without':217 'x402':41,94,115 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"7a360da3-f08f-4018-8f8d-66bc2e471480","listingId":"4d317961-71bc-4cb1-adeb-03cfe6a2f80a","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.583Z"}],"sources":[{"listingId":"4d317961-71bc-4cb1-adeb-03cfe6a2f80a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.583Z","lastSeenAt":"2026-04-22T02:32:07.309Z"}],"details":{"listingId":"4d317961-71bc-4cb1-adeb-03cfe6a2f80a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/36 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $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 returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/messages/36"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/36"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to data, AI inference, finance, or utility endpoints with crypto micropayments","Testing x402 payment flows on Base with low-cost endpoints"],"bestFor":["Developers exploring x402 protocol integrations","AI agents that settle per-call payments in USDC on Base","Projects needing keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.767Z"},"updatedAt":"2026-04-22T02:32:07.309Z"}}