{"id":"8d1f8c4c-a35a-43fe-8bb4-f2a2f11ba579","shortId":"GWjvy6","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/58` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) 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 offers 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point and settle in USDC on Base.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The specific functionality behind the `/api/v1/payments/58` endpoint is unclear beyond its title \"Premium API Access.\"","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["infrastructure","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No OpenAPI specification or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content","The specific functionality of /api/v1/payments/58 ('Premium API Access') is not described anywhere","No request body schema or response schema documented — callers cannot know what to send or expect back","The platform lists many endpoint categories (AI, finance, data, utils) but provides no evidence of actual implementation behind them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/58","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/58","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 spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of the /api/v1/payments/58 endpoint is undefined beyond its generic title. This is effectively a stub 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'/api/v1/payments/58':57,212 '/docs':171 '/pricing':173 '/readme':175 '/request':13,28,157 '0.02':12,27,79,156 '000':73 '20':72 '402':67 'Base network API' 'USDC API' 'accept':46 'access':63,93,221 'across':113 'advertis':84 'ai':123 'analysi':127 'analyt':117 'api':5,20,38,62,86,220 'attach':96 'avail':202 'base':8,23,51,74,165 'base-network' 'behind':210 'beyond':216 'broader':109 'call':4,19,81 'caller':94 'categori':115 'challeng':68 'classif':130 'connect':181 'convers':147 'crawl':205 'data':116,120 'detail':188 'document':166,197 'embed':131 'endpoint':55,112,150,213 'estim':141 'exampl':201 'exchang':136 'export':121 'extrem':168 'feed':135 'financ':132 'four':114 'function':209 'gas':140 'generat':148 'geocod':145 'header':101 'i.e':78 'infrastructur':143 'insight':122 'instant':92 'json-response' 'key':87 'learn':125 'limit':90 'list':59,152 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':124 'materi':206 'metric':118 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':111 'openapi':192 'page':176 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,100,106 'per':3,18,36,80 'platform':6,21,39,83,110 'point':159 'premium':61,219 'price':134,158 'prompt':183 'proof':107 'protocol':44 'quot':139 'rate':89,137 'render':178 'report':119 'request':37,69 'request/response':195 'return':65 'schema':196 'sentiment':126 'settl':161 'simpli':95 'spars':169 'spec':193 'specif':54,208 'summar':129 'technic':187 'text':128 'titl':218 'token':138 'unclear':215 'unit':75 'usag':200 'usdc':15,30,47,77,163 'usdc-settlement' 'use':41 'util':144 'valid':104,146 'via':10,25 'wallet':182 'web3':133 'x':99 'x-payment':98 'x402':11,26,43,105 'x402 API' 'x402-payment'","prices":[{"id":"0f02b0cc-f57b-4eb1-aca7-e3d75cbfd191","listingId":"8d1f8c4c-a35a-43fe-8bb4-f2a2f11ba579","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:59.329Z"}],"sources":[{"listingId":"8d1f8c4c-a35a-43fe-8bb4-f2a2f11ba579","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:59.329Z","lastSeenAt":"2026-04-22T21:31:10.914Z"}],"details":{"listingId":"8d1f8c4c-a35a-43fe-8bb4-f2a2f11ba579","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/58 \\\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 ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/58"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/58"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Paying per-call for miscellaneous utility endpoints (geocoding, validation, conversion)","Accessing AI inference endpoints (sentiment, summarization, classification) with crypto micropayments"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents settling in USDC on Base","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.529Z"},"updatedAt":"2026-04-22T21:31:10.914Z"}}