{"id":"02a896e3-36eb-4f7c-b544-82f3c976bdd9","shortId":"gF8LKK","kind":"x402","title":"Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/wire/200` is labeled \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's advertised flat pricing.\n\nThe broader platform advertises four categories of APIs: 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 with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/wire/200` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","finance-data","utility-services","sentiment-analysis","text-summarization","embeddings","geocoding"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","crypto pay api"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema describing request format or response structure for /api/v1/wire/200","The purpose of the specific /api/v1/wire/200 endpoint is unclear — 'Premium API Access' is not descriptive","Cannot verify that any of the advertised API categories (AI, finance, data, utils) are actually functional"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/200","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/wire/200","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 402 challenge with clear pricing. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the wire/200 endpoint actually does beyond 'Premium API Access'. The broader site lists many endpoints but provides no detail on any of 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'/request':19,38 '0.02':18,37,93,150 '000':84 '20':83 '402':213 '6':89 'accept':71 'access':50,69 'actual':204 'advertis':101,107 'ai':12,31,119 'ai-inference' 'analysi':123 'analyt':113 'api':5,24,48,68,111,155,171 'base':8,27,58,75,85 'base network api' 'broader':105 'call':4,23 'categori':109 'challeng':78,214 'classif':126 'collect':42 'commit':163 'connect':180 'consist':96 'content':186 'convers':143 'crypto pay api' 'data':11,30,112,116 'data-analytics' 'decim':90 'descript':198 'detail':197 'doc':170 'document':165,217 'embed':127 'embeddings' 'endpoint':16,35,49,62,146,203,207 'equal':92 'estim':137 'exampl':194 'exchang':132 'expect':229 'export':117 'extrem':167 'feed':131 'financ':13,32,128 'finance-data' 'flat':102 'four':108 'gas':136 'generat':144 'geocod':141 'geocoding' 'indic':79 'infrastructur':139 'insight':118 'key':156 'label':66 'learn':121 'limit':159 'list':148 'live':209 'low payment fee' 'lowpaymentfee.com':39 'machin':120 'maxamountrequir':81 'metric':114 'micropayment api' 'minimum':162 'network':59 'no-api-key' 'offer':40 'openapi':190 'page':175 'pay':2,21,45 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':44 'payload':222 'payment':54,73 'per':3,22,46,94,151 'platform':106 'premium':67 'price':103,130,172 'prompt':182 'protocol':55 'quot':135 'rate':133,158 'readm':174 'render':177 'report':115 'request':47,95,152 'request/response':193 'requir':164 'respons':227 'return':205,210 'schema':191 'send':224 'sentiment':122 'sentiment-analysis' 'site':99 'spars':168 'specif':61 'suit':6,25 'summar':125 'text':124 'text-summarization' 'token':134 'unclear':220 'unit':86 'usdc':72,88 'usdc api access' 'usdc-base' 'util':15,34,140 'utility-services' 'valid':142,212 'via':9,28,51 'wallet':181 'web3':129 'without':216 'x402':10,29,53,77 'x402 api' 'x402-payment'","prices":[{"id":"fc002e0e-6146-415d-892b-bfb0675ba277","listingId":"02a896e3-36eb-4f7c-b544-82f3c976bdd9","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/wire/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:01.659Z"}],"sources":[{"listingId":"02a896e3-36eb-4f7c-b544-82f3c976bdd9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/200","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:01.659Z","lastSeenAt":"2026-04-22T07:01:44.570Z"}],"details":{"listingId":"02a896e3-36eb-4f7c-b544-82f3c976bdd9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/200 \\\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":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/200"},{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four categories of APIs are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding, validation, and conversion without subscription commitments"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Micropayment-based workflows where per-request billing is preferred over subscriptions","Base/USDC-native applications that can settle payments on-chain"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where subscription pricing would be more cost-effective","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.518Z"},"updatedAt":"2026-04-22T07:01:44.570Z"}}