{"id":"e6d82e43-1679-451c-aaa1-e3cf4eeac4b3","shortId":"Fgp2pA","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 an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/43` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation 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 example payloads available. The actual functionality behind this specific `/payments/43` endpoint and the other listed endpoints cannot be verified from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI spec or schema documentation available","Docs, pricing, API, and README pages all render only 'Connect wallet' with no content","The actual functionality behind /api/v1/payments/43 ('Premium API Access') is undocumented and unverifiable","No request body schema or response schema is documented anywhere","The broad claims about AI, analytics, finance endpoints cannot be verified from crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/43","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/43","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 payments. However, there is no documentation, no OpenAPI spec, no request/response examples, and the docs/pricing/README pages are all blank beyond a wallet connect prompt. The actual functionality of this specific endpoint is unknown — 'Premium API Access' is not descriptive. This is effectively a stub 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'/payments/43':223 '/request':13,28 '0.02':12,27,63,122,176 '000':111 '0x8335':116 '20':110 '2913':117 '300':135 '402':105 '402 payment api' '6':126 'accept':140 'access':101 'account':75 'across':45 'actual':218 'advertis':149 'ai/ml':48 'analysi':153 'analyt':47 'api':5,20,37,73,100,186 'application/json':145 'attach':83 'avail':216 'base':8,23,70,112,119 'base network api' 'base-network' 'behind':220 'broader':147 'call':4,19 'caller':81 'cannot':230 'challeng':106 'classif':156 'connect':195 'convers':168 'crawl':235 'data':46,51,170 'decim':127 'detail':202 'doc':185 'document':180,211 'embed':157 'enabl':36 'endpoint':44,56,93,139,150,224,229 'equal':121 'estim':165 'exact':132 'exampl':214 'exchang':160 'extrem':182 'feed':159 'finance/web3':50 'function':219 'gas':164 'generat':171 'geocod':166 'given':123 'header':87 'howev':179 'infer':49 'json-response' 'key':74 'limit':78 'list':97,228 'low payment fee' 'lowpaymentfee.com':31 'materi':236 'micropayment api' 'network':9,24,71 'no-api-key' 'offer':40 'openapi':206 'page':190 'pay':2,17,59 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':58 'payload':215 'payment':86,129 'per':3,18,60 'platform':6,21,38,148 'point':178 'post':141 'post-method' 'premium':99 'price':158,177,187 'prompt':197 'quot':163 'rate':77,161 'readm':189 'render':192 'request':61,90,107,142 'request/response':209 'requir':80 'return':103,144 'schema':210 'scheme':130 'second':136 'sentiment':152 'servic':54 'settl':65 'simpli':82 'spars':183 'spec':207 'specif':92,222 'summar':155 'technic':201 'text':154 'timeout':137 'token':162 'unit':113 'usdc':15,30,67,115,124 'usdc api' 'usdc-settlement' 'util':53 'valid':167 'varieti':42 'verifi':232 'via':10,25 'wallet':196 'x402':11,26,35,85 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a6b2d5f2-4599-4693-9f59-06170b943060","listingId":"e6d82e43-1679-451c-aaa1-e3cf4eeac4b3","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:43.476Z"}],"sources":[{"listingId":"e6d82e43-1679-451c-aaa1-e3cf4eeac4b3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:43.476Z","lastSeenAt":"2026-04-24T03:32:24.284Z"}],"details":{"listingId":"e6d82e43-1679-451c-aaa1-e3cf4eeac4b3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/43 \\\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":"Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/43"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/43"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to utility or data endpoints with per-call USDC micropayments","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers exploring x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Low-volume callers who want no commitments or subscriptions"],"notFor":["Users needing well-documented APIs with clear request/response schemas","High-volume production workloads where per-call pricing adds up","Anyone requiring verified, auditable data sources"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.261Z"},"updatedAt":"2026-04-24T03:32:24.284Z"}}