{"id":"aa7646a0-d753-4bf1-8d18-e08c770c08de","shortId":"GLXpj4","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/267` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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. Payments settle to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind this specific `/api/v1/payments/267` endpoint is unclear beyond its title \"Premium API Access.\" Callers should be aware that without documented input/output schemas, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — input/output formats are undocumented","Docs, pricing, API, and README pages all render only 'Connect wallet' with no useful content","The specific functionality of /api/v1/payments/267 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint","No response examples or error documentation available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/267","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/267","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 documented input/output schema, no usage examples, and the docs pages are empty. The purpose of this specific endpoint (/api/v1/payments/267) beyond 'Premium API Access' is 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'/request':13,28,158 '0.02':12,27,79,157 '000':73 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':165 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':168 '20':72 '402':67 '402 payment api' '6':83 'accept':46 'access':63,224 'actual':210 'address':164 'advertis':112 'ai':124 'analysi':128 'analyt':118 'api':5,20,38,62,88,114,179,223 'attach':97 'avail':205 'awar':228 'base':8,23,51,74,170 'base network api' 'behind':212 'beyond':219 'broader':110 'call':4,19,86 'caller':95,225 'categori':115 'challeng':68 'classif':131 'connect':185 'contact':238 'content':191 'convers':148 'crawl':208 'data':117,121 'decim':84 'doc':176 'document':171,200,231 'embed':132 'endpoint':55,151,216 'estim':142 'exampl':204 'exchang':137 'experiment':236 'export':122 'extrem':173 'feed':136 'financ':133 'function':211 'gas':141 'generat':149 'geocod':146 'given':80 'header':102 'i.e':78 'includ':116 'infrastructur':144 'input/output':232 'insight':123 'integr':234 'json-response' 'key':89 'learn':126 'limit':92 'list':59,153 'low payment fee' 'lowpaymentfee.com':31 'machin':125 'metric':119 'micropayment api' 'multipl':113 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':195 'page':180 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,101,107,161 'per':3,18,36,85 'platform':6,21,39,111 'point':160 'premium':61,222 'price':135,159,177 'prompt':187 'proof':108 'protocol':44 'provid':240 'quot':140 'rate':91,138 'render':182 'report':120 'request':37,69 'request/response':198 'requir':94,235 'return':65 'schema':199,233 'sentiment':127 'settl':162 'simpli':96 'spars':174 'spec':196 'specif':54,214 'summar':130 'text':129 'titl':221 'token':139 'unclear':218 'unit':75 'usag':203 'usdc':15,30,47,77,81,167 'usdc api' 'usdc-base-network' 'use':41,166 'util':145 'valid':105,147 'via':10,25 'wallet':186 'web3':134 'without':230 'x':100 'x-payment':99 'x402':11,26,43,106 'x402 api' 'x402-payment'","prices":[{"id":"c8de87dd-7dd5-441d-85db-d2842e07d48a","listingId":"aa7646a0-d753-4bf1-8d18-e08c770c08de","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/267","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:05.102Z"}],"sources":[{"listingId":"aa7646a0-d753-4bf1-8d18-e08c770c08de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/267","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:05.102Z","lastSeenAt":"2026-04-24T02:32:26.859Z"}],"details":{"listingId":"aa7646a0-d753-4bf1-8d18-e08c770c08de","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl (you need an x402-compatible client to generate the header):\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/267 \\\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":"Endpoint returns 402 with x402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/267"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/267"}],"useCases":["Programmatic access to a pay-per-call API without needing API key registration","Agent-driven API consumption where payment is handled inline via x402 protocol","Exploring x402-based micropayment patterns for API monetization"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can attach x402 payment headers automatically","Low-friction API access without signup or subscription"],"notFor":["Production workloads requiring documented and stable API contracts","Users who need detailed request/response schemas before integration","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.114Z"},"updatedAt":"2026-04-24T02:32:26.859Z"}}