{"id":"fbecf17c-f68a-474a-96c1-2ce9b4075751","shortId":"5cYPm2","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 platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no subscription 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/wire/121` is listed as \"Premium API Access\" with a max amount of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. 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 thin: 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 content. The actual functionality behind `/api/v1/wire/121` specifically is unclear — it may be a generic wire/transfer endpoint or a catch-all premium access route.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API","serverless API access"],"warnings":["No OpenAPI spec or schema documentation available","Docs, API, pricing, and README pages all render only 'Connect wallet' with no usable content","The specific functionality of /api/v1/wire/121 ('Premium API Access') is not documented — unclear what it actually returns","No request body schema or response schema is provided anywhere","Cannot verify that the advertised AI, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/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/wire/121","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/wire/121 is undocumented. The platform lists many endpoint categories but provides no technical details for any of 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'/request':12,28 '0.02':11,27,64,131,134,188 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':149 '20':125 'Base network API' 'USDC API' 'accept':152 'access':106,119,254 'actual':234 'address':142 'advertis':161 'ai':51 'ai-inference' 'amount':123 'analysi':165 'analyt':50 'api':5,14,21,30,39,82,118,198 'application/json':157 'attach':93 'avail':228 'base':8,24,72,127,136 'behind':236 'broad':44 'broader':159 'call':4,20 'caller':91 'catalog':45 'catch':251 'catch-al':250 'classif':168 'classification' 'commit':90 'connect':207 'content':232 'contract':147 'convers':180 'crawl':231 'crypto-paid API' 'crypto-quotes' 'data':49,182 'data-analytics' 'detail':214 'doc':197 'document':192,223 'embed':169 'embeddings' 'enabl':38 'endpoint':47,60,108,111,151,162,247 'estim':177 'everi':59 'exampl':227 'exchang':172 'extrem':194 'feed':171 'financ':54 'finance-data' 'function':235 'gas':176 'generat':183 'generic':245 'geocod':178 'geocoding' 'header':98 'howev':191 'i.e':133 'infrastructur':57 'key':15,31,83 'learn':53 'limit':86 'list':115 'low fee API' 'lowpaymentfee.com':33 'machin':52 'max':122 'may':242 'micropayment API' 'network':73 'no-api-key' 'offer':42 'openapi':218 'page':202 'paid':67 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'payment':77,97,103,138 'per':3,19,65 'per-request-billing' 'platform':6,22,40,160 'point':190 'post':153 'premium':117,253 'price':62,170,189,199 'prompt':209 'proof':104 'protocol':78 'quot':175 'rate':85,173 'readm':201 'render':204 'request':66,154 'request/response':221 'requir':16,32 'return':156 'rout':255 'schema':222 'sentiment':164 'sentiment-analysis' 'serverless API access' 'settl':140 'simpli':92 'span':48 'spec':219 'specif':110,238 'subscript':89 'summar':167 'technic':213 'text':166 'text-summarization' 'thin':195 'token':174 'unclear':240 'unit':128 'usag':226 'usdc':69,130,132,146 'usdc-base' 'use':144 'util':58 'utility-services' 'valid':101,179 'via':9,25,74 'wallet':208 'web3':55 'wire/transfer':246 'x':96 'x-payment':95 'x402':10,26,37,76,102 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"f24f05b5-0b04-45c2-b794-edce39be3b34","listingId":"fbecf17c-f68a-474a-96c1-2ce9b4075751","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/wire/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":"2026-04-18T19:28:34.971Z"}],"sources":[{"listingId":"fbecf17c-f68a-474a-96c1-2ce9b4075751","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/121","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:34.971Z","lastSeenAt":"2026-04-22T15:02:28.584Z"}],"details":{"listingId":"fbecf17c-f68a-474a-96c1-2ce9b4075751","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/121 \\\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 priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints for analytics, AI (sentiment, summarization, classification, embeddings), finance (prices, rates, quotes, gas), and utilities (geocode, validate, convert, generate)","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC ($0.02) on Base, paid to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/wire/121"}],"useCases":["Agents that need on-demand access to AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation utilities paid per request via USDC on Base","Building autonomous agent workflows that pay for each API call programmatically"],"bestFor":["AI agents and bots that need keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for low-volume usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing may add up compared to bulk plans","Users without USDC on Base or unfamiliar with x402 payment flows","Anyone needing detailed API documentation or SLAs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.834Z"},"updatedAt":"2026-04-22T15:02:28.584Z"}}