{"id":"fb7eb174-b349-412b-a1c3-03db5223f64f","shortId":"ppErGv","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/59` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform lists endpoints across four categories: 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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request. However, the specific endpoint probed (`/api/v1/payments/59`) does not clearly map to any of these named services; its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/59` endpoint actually does beyond its title. Callers should be aware that the actual behavior of this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment protocol"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The endpoint '/api/v1/payments/59' has no description beyond 'Premium API Access'; its actual functionality is unknown.","No OpenAPI schema or request/response examples are provided anywhere on the site.","This endpoint does not clearly correspond to any of the named services listed on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/59","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/59","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, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and no documentation explaining what this specific endpoint actually does. The docs pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/api/v1/payments/59':57,160,225 '/docs':194 '/pricing':196 '/readme':198 '/request':13,28 '0.02':12,27,77,152 '000':72 '20':71 '402':66 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,177 'across':112 'actual':227,238 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,176 'attach':95 'awar':235 'base':8,23,51,73 'behavior':239 'beyond':229 'broader':108 'call':4,19,80 'caller':93,232 'categori':114 'challeng':67 'classif':129 'clear':163 'connect':204 'content':210 'convers':145 'data':115,119,184 'descript':172,221 'document':181,189 'embed':130 'endpoint':55,111,148,158,226,242 'estim':140 'exampl':218 'exchang':135 'export':120 'extrem':191 'feed':134 'financ':131 'four':113 'function':186 'gas':139 'generat':146 'geocod':143 'header':100 'howev':155 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':59 'learn':124 'limit':89 'list':110 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'map':164 'metric':117 'name':169 'network':9,24,52 'no-api-key' 'openapi':214 'page':199 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,153 'platform':6,21,39,82,109 'premium':60,175 'price':133,150 'probe':159 'prompt':206 'proof':106 'protocol':44 'quot':138 'rate':88,136 'render':201 'report':118 'request':37,68,154 'request/response':217 'return':64,188 'schema':215 'sentiment':125 'servic':170 'simpli':94,174 'spars':192 'specif':54,157 'substant':209 'summar':128 'text':127 'titl':231 'token':137 'undocu':244 'unit':74 'usd':78 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'valid':103,144 'via':10,25 'wallet':205 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"45570c79-d8c6-4340-95ce-8699f079c7dd","listingId":"fb7eb174-b349-412b-a1c3-03db5223f64f","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:49.540Z"}],"sources":[{"listingId":"fb7eb174-b349-412b-a1c3-03db5223f64f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:49.540Z","lastSeenAt":"2026-04-23T20:02:39.083Z"}],"details":{"listingId":"fb7eb174-b349-412b-a1c3-03db5223f64f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/59 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/payments/59"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /api, /pricing, and /README pages render only a 'Connect wallet' prompt with no substantive documentation.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access","Low-cost per-request API consumption settled on-chain"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring well-documented request/response schemas before integrating","High-throughput use cases where on-chain settlement per request adds unacceptable latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.034Z"},"updatedAt":"2026-04-23T20:02:39.083Z"}}