{"id":"880a8914-11f2-4c14-81f0-68f9d482b1bf","shortId":"Ugt4fG","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 an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/payments/97` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The broader platform advertises the same $0.02 flat rate across all its endpoints, covering categories like sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README 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 crawled material. The endpoint is confirmed live (returning a proper 402 challenge), but without documentation it is unclear what request body this specific endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto API marketplace"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose and expected request body for /api/v1/payments/97 is undocumented","No response schema or example responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/97","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page provides a clear pricing model. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific '/payments/97' endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/payments/97':108 '/docs':181 '/pricing':182 '/readme':185 '/request':12,28 '0.02':11,27,139,152 '000':128 '0x8335':133 '20':127 '2913':134 '402':224 '6':144 'Base network API' 'USDC micropayment API' 'accept':116 'access':101,114 'across':47,155 'advertis':149 'ai/ml':50 'analysi':163 'analyt':49 'api':5,14,21,30,39,77,113 'attach':88 'avail':211 'base':8,24,67,129,136 'bodi':234 'broader':147 'call':4,20 'caller':86 'categori':160 'challeng':121,225 'classif':166 'commit':85 'confirm':219 'connect':191 'content':197 'cost':125 'cover':159 'crawl':214 'crypto API marketplace' 'data':48 'decim':145 'document':176,206,228 'embed':167 'enabl':38 'endpoint':46,57,103,106,158,217,237 'equal':138 'exampl':210 'exchang':170 'expect':238 'extrem':178 'feed':169 'finance/web3':52 'flat':153 'geocod':172 'header':93 'indic':122 'infer':51 'infrastructur':54 'json-response' 'key':15,31,78 'like':161 'limit':81 'list':110 'live':220 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'marketplac':40 'materi':215 'maximum':124 'minimum':84 'network':68 'no-api-key' 'offer':42 'openapi':201 'page':186 'pay':2,18,60 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':59 'payment':92,98 'per':3,19,61,140 'platform':6,22,148 'post':117 'post-endpoint' 'premium':112 'price':168 'prompt':193 'proof':99 'proper':223 'protocol':73 'rate':80,154,171 'render':188 'request':62,118,141,233 'request/response':204 'requir':16,32 'respons':241 'return':221,243 'schema':205 'sentiment':162 'settl':69 'simpli':87 'spars':179 'spec':202 'specif':105,236 'summar':165 'text':164 'unclear':231 'unit':130 'usag':209 'usdc':64,132,142 'usdc-base' 'use':63,143 'util':55 'valid':96,173 'varieti':44 'via':9,25,70 'wallet':192 'without':227 'x':91 'x-payment':90 'x402':10,26,37,72,97,120 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"69c35bdb-7162-42c8-9d2a-b90185e84e9e","listingId":"880a8914-11f2-4c14-81f0-68f9d482b1bf","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:07.044Z"}],"sources":[{"listingId":"880a8914-11f2-4c14-81f0-68f9d482b1bf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:07.044Z","lastSeenAt":"2026-04-22T21:31:11.240Z"}],"details":{"listingId":"880a8914-11f2-4c14-81f0-68f9d482b1bf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/97 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/payments/97 specifies maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/97"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services without managing API keys or subscriptions","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-use endpoints"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Developers without access to USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.032Z"},"updatedAt":"2026-04-22T21:31:11.240Z"}}