{"id":"c8856318-7923-4948-b24a-a65d44259918","shortId":"sYxYks","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 `/api/v1/charges/69` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) 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 uniformly 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 technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what request body the `/api/v1/charges/69` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payments","402 payment protocol"],"warnings":["No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'","The specific purpose and expected request body for /api/v1/charges/69 are undocumented","No example responses are available to verify what the endpoint actually returns","The platform lists many endpoint categories but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/69","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response documentation, no examples, and the docs pages are empty. The purpose of this specific endpoint (/api/v1/charges/69) is unclear beyond the label 'Premium API Access'. This is effectively a stub 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'/api/v1/charges/69':56,211 '/docs':158 '/pricing':160 '/readme':162 '/request':13,28 '0.02':12,27,77,150 '000':72 '20':71 '402':66 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92 'across':108 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85 'attach':95 'avail':189 'base':8,23,51,73 'bodi':209 'broader':104 'call':4,19,80 'categori':110 'challeng':67,200 'classif':125 'connect':168 'convers':142 'crypto API payments' 'data':111,115 'detail':175 'document':153,184,203 'embed':126 'endpoint':55,107,145,191,212 'estim':136 'exampl':187 'exchang':131 'expect':213 'export':116 'extrem':155 'feed':130 'financ':127 'four':109 'gas':135 'generat':143 'geocod':140 'header':99 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'learn':120 'limit':89 'list':58 'live':193 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':179 'page':163 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':188 'payment':48,98 'per':3,18,36,79,151 'platform':6,21,39,82,105 'premium':60 'price':129,147 'prompt':170 'protocol':44 'quot':134 'rate':88,132 'render':165 'report':114 'request':37,68,102,152,208 'request/response':182 'respond':195 'return':64,217 'schema':183 'sentiment':121 'simpli':94 'spars':156 'spec':180 'specif':54 'summar':124 'technic':174 'text':123 'token':133 'unclear':206 'uniform':148 'unit':74 'usd':78 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141,198 'via':10,25 'wallet':169 'web3':128 'without':202 'x402':11,26,43,97,199 'x402 API' 'x402-payment'","prices":[{"id":"73750cca-44b5-4e3a-8304-8eaee4c5663d","listingId":"c8856318-7923-4948-b24a-a65d44259918","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:40.491Z"}],"sources":[{"listingId":"c8856318-7923-4948-b24a-a65d44259918","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:40.491Z","lastSeenAt":"2026-04-24T10:32:39.504Z"}],"details":{"listingId":"c8856318-7923-4948-b24a-a65d44259918","quickStartSnippet":"# Endpoint requires an x402 payment header with USDC on Base.\n# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/69\n# 2. Attach the X-PAYMENT header (constructed per x402 spec) and resend.","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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/69"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off API calls paid in USDC on Base network","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want zero-signup API access via crypto micropayments","AI agents that can autonomously pay for API calls using x402","Users already holding USDC on Base who want frictionless API consumption"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Teams requiring fiat-only payment methods with no crypto wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.856Z"},"updatedAt":"2026-04-24T10:32:39.504Z"}}