{"id":"8af39de6-97cd-4317-a484-ae34af4ec86c","shortId":"vHAXKW","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","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 `/api/v1/charges/121` 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 — you simply attach an x402 payment header to each request.\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 priced at $0.02 per request.\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 description of what the `/api/v1/charges/121` endpoint specifically returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality this particular route provides versus the other listed endpoints.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-platform","finance","ai"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto API access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/charges/121 ('Premium API Access') is unclear and undocumented","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/121","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/charges/121","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 pricing and network. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what this specific endpoint returns. The listing is effectively a 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'/api/v1/charges/121':58,190 '/docs':159 '/pricing':161 '/readme':163 '/request':12,28 '0.02':11,27,80,151 '000':74 '20':73 '402':68,198 'Base network API' 'USDC pay-per-call' 'accept':48 'access':64,94 'across':110 'advertis':85 'ai':120 'analysi':124 'analyt':114 'api':5,14,21,30,40,63,87 'attach':97 'base':8,24,53,75 'broader':106 'call':4,20,82 'categori':112 'challeng':69,199 'classif':127 'confirm':200 'connect':169 'content':175 'convers':144 'crypto API access' 'data':113,117,208 'descript':186 'document':154,203 'embed':128 'endpoint':57,109,147,191,195,219 'estim':138 'exampl':183 'exchang':133 'export':118 'extrem':156 'feed':132 'financ':129 'four':111 'function':210 'gas':137 'generat':145 'geocod':142 'header':101 'http-post' 'i.e':79 'infrastructur':140 'insight':119 'instant':93 'json-response' 'key':15,31,88 'learn':122 'limit':91 'list':60,218 'live':197 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':121 'metric':115 'micropayment API' 'network':54 'no-api-key' 'offer':108 'openapi':179 'page':164 'particular':212 'pay':2,18,37 'pay-per-cal':1,17 'pay-per-request':36 'payment':50,100 'per':3,19,38,81,152 'platform':6,22,41,84,107 'premium':62 'price':131,149 'prompt':171 'protocol':46 'provid':214 'quot':136 'rate':90,134 'render':166 'report':116 'request':39,70,104,153 'request/response':182 'requir':16,32 'return':66,193 'rout':213 'schema':180 'sentiment':123 'simpli':96 'spars':157 'specif':56,192 'summar':126 'text':125 'token':135 'unclear':206 'unit':76 'usdc':49,78 'usdc-base-network' 'use':43 'util':141 'valid':143 'versus':215 'via':9,25 'wallet':170 'web3':130 'without':202 'x402':10,26,45,99 'x402 API' 'x402-payment'","prices":[{"id":"408ccb0d-4374-4d9c-b562-8f9883bc14c0","listingId":"8af39de6-97cd-4317-a484-ae34af4ec86c","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/charges/121","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:07.926Z"}],"sources":[{"listingId":"8af39de6-97cd-4317-a484-ae34af4ec86c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/121","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:07.926Z","lastSeenAt":"2026-04-22T18:31:25.711Z"}],"details":{"listingId":"8af39de6-97cd-4317-a484-ae34af4ec86c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/121 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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","source_url":"https://lowpaymentfee.com/api/v1/charges/121"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/121"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls from autonomous agents using x402 on Base","Integrating pay-per-use endpoints into workflows that settle in USDC"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle payments via x402 on Base","Projects needing low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk/subscription pricing","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.285Z"},"updatedAt":"2026-04-22T18:31:25.711Z"}}