{"id":"63acba84-c7c6-4032-a0b0-4777388fdba5","shortId":"DNQjFT","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general 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 at `/api/v1/messages/92` is listed as \"Premium API Access.\" 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 decimals. The endpoint accepts HTTP POST and returns `application/json`. The broader site advertises additional endpoint families including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nBecause the `/api/v1/messages/92` path name is generic and the site provides no documentation beyond the landing page listing, the actual functionality behind this particular endpoint is unclear. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Prospective callers should be aware that there is no OpenAPI schema, no request/response examples, and no detailed documentation available for any of the endpoints.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","http-post","no-api-key","no-rate-limit"],"categories":["api-marketplace","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available for /api/v1/messages/92 — its actual functionality is unknown","No OpenAPI or JSON schema describing request or response formats","Docs, pricing, and README pages return only 'Connect wallet' with no content","The endpoint path 'messages/92' suggests a specific resource but its purpose is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/92","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/92","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 402 challenge, but there is zero documentation on what /api/v1/messages/92 actually does, no OpenAPI schema, no request/response examples, and the crawled docs/pricing/README pages are empty beyond a wallet-connect prompt. The listing is essentially a stub with only pricing and protocol metadata 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'/request':18,36 '0.02':17,35,68,131,173 '000':120 '0x8335':125 '20':119 '2913':126 '402 payment api' '6':135 'accept':139 'access':110 'actual':195 'addit':149,219 'advertis':114,148 'ai':12,30 'ai/ml':55 'analysi':154 'analyt':11,29,54 'api':5,23,43,81,109 'application/json':144 'attach':92 'avail':239 'awar':225 'base':8,26,76,121,128 'base network api' 'behind':197 'beyond':189 'broad':48 'broader':146 'call':4,22 'caller':90,222 'challeng':113 'classif':157 'collect':49 'commit':89 'connect':214 'content':220 'convers':165 'cost':117 'cover':10,28 'crawl':204 'data':53,58,167 'decim':136 'detail':237 'doc':205 'document':188,238 'embed':158 'enabl':42 'endpoint':51,64,102,138,150,200,244 'equal':130 'everi':63 'exampl':234 'exchang':161 'export':168 'famili':151 'feed':160 'financ':13,31 'finance/web3':57 'function':196 'general':60 'generic':182 'geocod':163 'given':132 'header':96 'http':140 'http-post' 'includ':152 'infer':56 'infrastructur':61 'json-api' 'key':82 'land':191 'limit':85 'list':106,193 'low payment fee' 'lowpaymentfee.com':37 'marketplac':44 'maximum':116 'micropayment api' 'minimum':88 'name':180 'network':77 'no-api-key' 'no-rate-limit' 'offer':46 'openapi':230 'page':192,209 'particular':199 'path':179 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':95 'per':3,21,69 'point':175 'post':141 'premium':108 'price':66,159,174,206 'prompt':216 'prospect':221 'provid':186 'rate':84,162 'readm':208 'request':70,99 'request/response':233 'return':143,211 'schema':231 'sentiment':153 'settl':71 'simpli':91 'site':147,185 'span':52 'specif':101 'suit':6,24 'summar':156 'text':155 'unclear':202 'unit':122 'usdc':9,27,73,124,133 'usdc api' 'usdc-base' 'util':15,33,62 'valid':164 'wallet':215 'x402':41,94,112 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"98574d97-42b3-4caa-bf1f-c05a729eb011","listingId":"63acba84-c7c6-4032-a0b0-4777388fdba5","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/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.326Z"}],"sources":[{"listingId":"63acba84-c7c6-4032-a0b0-4777388fdba5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.326Z","lastSeenAt":"2026-04-22T02:32:08.411Z"}],"details":{"listingId":"63acba84-c7c6-4032-a0b0-4777388fdba5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/92 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/92","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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/92"},{"claim":"All endpoints are 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":"The site offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/92"}],"useCases":["Making low-cost per-request API calls without managing API keys or subscriptions","Programmatic agents paying for API access on-the-fly via x402 USDC micropayments","Accessing a variety of data, AI, finance, and utility endpoints from a single provider"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access on Base","Exploring x402 protocol integrations with minimal cost ($0.02/call)","Quick prototyping without signup or rate-limit concerns"],"notFor":["Production workloads requiring well-documented, schema-validated APIs","Use cases needing guaranteed SLAs, support, or detailed error documentation","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.705Z"},"updatedAt":"2026-04-22T02:32:08.411Z"}}