{"id":"8d640aa4-59a7-4812-934e-d11b51ae894b","shortId":"HTLqdF","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol. The specific endpoint at `/api/v1/charges/299` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network in USDC (contract 0x8335…2913) with a maximum charge of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises 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 listed endpoints share the same $0.02/request pricing.\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 usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body this specific `/charges/299` endpoint expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay per call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no technical content.","No OpenAPI or schema definition found; request body and response format for /api/v1/charges/299 are unknown.","The specific functionality behind 'Premium API Access' at /charges/299 is not described anywhere in the crawled material.","The broader platform lists many endpoint categories (AI, finance, data, etc.) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/299","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/299","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages are empty stubs. The purpose and behavior of this specific /charges/299 endpoint are undocumented, making this effectively a stub 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'/api/v1/charges/299':52 '/charges/299':229 '/docs':172 '/pricing':174 '/readme':176 '/request':13,28,165 '0.02':12,27,85,164 '000':80 '0x8335':72 '20':79 '2913':73 '402':216 '6':90 'Base network API' 'USDC micropayment API' 'accept':59 'access':7,22,57 'across':122 'advertis':120 'ai':132 'analysi':136 'analyt':126 'api':6,21,40,56,93 'attach':104 'avail':203 'base':9,24,67,81 'base-network' 'bodi':226 'broader':117 'call':4,19 'caller':102 'categori':124 'challeng':217 'charg':77 'classif':139 'collect':34 'commit':99 'confirm':211 'connect':182 'contract':71 'convers':156 'crawl':206 'crypto-paid API' 'data':125,129 'decim':91 'detail':189 'document':167,198,220 'embed':140 'endpoint':41,50,121,160,209,230 'equal':84 'estim':150 'exampl':202 'exchang':145 'expect':231 'export':130 'extrem':169 'feed':144 'financ':141 'four':123 'gas':149 'gate':42 'generat':157 'geocod':154 'header':109 'host':32 'infrastructur':152 'insight':131 'key':94 'label':54 'learn':134 'limit':96 'list':159 'live':212 'lowpaymentfee' 'lowpaymentfee.com':31,118 'machin':133 'materi':207 'maximum':76 'metric':127 'network':68 'no-api-key' 'openapi':193 'page':177 'pay':2,17,37 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':36 'payload':235 'payment':46,62,108,114 'per':3,18,38,86 'platform':119 'post':60 'post-endpoint' 'premium':5,20,55 'premium API access' 'price':143,166 'prompt':184 'proof':115 'proper':215 'protocol':47 'quot':148 'rate':95,146 'render':179 'report':128 'request':39,61,87,225 'request/response':196 'requir':101 'respons':234 'return':213,237 'schema':197 'sentiment':135 'settl':64 'share':161 'simpli':103 'spars':170 'spec':194 'specif':49,228 'summar':138 'technic':188 'text':137 'token':147 'unclear':223 'unit':82 'upfront':98 'usag':201 'usdc':15,30,70,88 'usdc-settlement' 'use':89 'util':153 'valid':112,155 'via':10,25 'wallet':183 'web3':142 'without':219 'x':107 'x-payment':106 'x402':11,26,45,113 'x402 API' 'x402-payment'","prices":[{"id":"8c244f99-4af1-4369-a1a6-8235e605ee5f","listingId":"8d640aa4-59a7-4812-934e-d11b51ae894b","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/299","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:56.242Z"}],"sources":[{"listingId":"8d640aa4-59a7-4812-934e-d11b51ae894b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/299","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:56.242Z","lastSeenAt":"2026-04-24T01:02:15.208Z"}],"details":{"listingId":"8d640aa4-59a7-4812-934e-d11b51ae894b","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Attach a valid X-PAYMENT header (x402 proof) to pay $0.02 in USDC on Base.\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/299 \\\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, maxAmountRequired 20000 USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/299"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/299"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access without subscription commitments or rate limits"],"bestFor":["Developers who want zero-commitment, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume consumers who prefer subscription-based pricing for cost predictability"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.007Z"},"updatedAt":"2026-04-24T01:02:15.208Z"}}