{"id":"c80bfa14-be53-4391-9a44-7911b48be256","shortId":"L3b7Kj","kind":"x402","title":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","tagline":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/keys/35` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The broader platform advertises endpoints spanning 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 at the same $0.02/request price point.\n\nPayment is handled entirely through the x402 payment header mechanism: callers send a cryptographic payment proof in the HTTP request header, and the endpoint processes the request without requiring traditional API keys, accounts, or rate limits. Settlement occurs on the Base L2 network to the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The endpoint was confirmed live, returning a proper 402 challenge with x402 version 1.\n\nNote that while the landing page lists many endpoints across multiple categories, the specific endpoint being listed here (`/api/v1/keys/35`) is described only as \"Premium API Access\" with no further documentation on what data or functionality it returns. There is no OpenAPI schema, no example responses, and the crawled docs/pricing/README pages all returned only a \"Connect wallet\" prompt with no additional content. The actual behavior of this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-l2","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API access","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The actual functionality of /api/v1/keys/35 is unknown — 'Premium API Access' is the only description","Docs, pricing, and README pages returned only 'Connect wallet' with no substantive content","No example request or response bodies are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/35","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/keys/35","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 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no example payloads, and the specific functionality of /api/v1/keys/35 is undocumented beyond the label 'Premium API Access'. The docs, pricing, and README pages returned no useful 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'/request':12,29,125 '0.02':11,28,78,124 '000':72 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':176 '1':190 '20':71 '402':185 'Base network API' 'USDC API access' 'access':6,23,66,216 'account':160 'across':200 'actual':253 'addit':250 'advertis':84 'ai':94 'analysi':98 'analyt':88 'api':5,22,44,65,158,215 'base':8,25,53,73,168 'base-l2' 'behavior':254 'broader':82 'call':4,21,80 'caller':138 'categori':202 'challeng':186 'charg':68 'classif':101 'collect':38 'confirm':180 'connect':245 'content':251 'contract':174 'convers':118 'crawl':238 'crypto-paid API' 'cryptograph':141 'data':87,91,223 'describ':211 'docs/pricing/readme':239 'document':220 'embed':102 'endpoint':45,59,85,151,178,199,205,258 'entir':131 'estim':112 'exampl':234 'exchang':107 'export':92 'feed':106 'financ':103 'function':225 'gas':111 'generat':119 'geocod':116 'handl':130 'header':136,148 'http':146 'http-post' 'i.e':77 'infrastructur':114 'insight':93 'key':16,33,159 'l2':169 'label':63 'land':195 'learn':96 'limit':163 'list':197,207 'live':181 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':95 'mani':198 'mechan':137 'metric':89 'micropayment API' 'multipl':201 'network':54,170 'no-api-key' 'note':191 'occur':165 'offer':36 'openapi':231 'page':196,240 'particular':257 'pay':2,19,41 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':40 'payment':128,135,142 'per':3,20,42,79 'platform':83 'point':127 'premium':64,214 'price':105,126 'process':152 'prompt':247 'proof':143 'proper':184 'protocol':50 'quot':110 'rate':108,162 'remain':259 'report':90 'request':43,147,154 'requir':17,34,156 'respons':235 'return':182,227,242 'schema':232 'send':139 'sentiment':97 'settl':46 'settlement':164 'span':86 'specif':58,204 'summar':100 'text':99 'token':109 'tradit':157 'unclear':260 'unit':74 'usdc':14,31,56,76,173 'usdc-settlement' 'use':55 'util':115 'valid':117 'version':189 'via':9,26,47 'wallet':246 'web3':104 'without':155 'x402':10,27,49,134,188 'x402 API' 'x402-payment'","prices":[{"id":"eb111f37-5311-4342-b3df-0c8d97742953","listingId":"c80bfa14-be53-4391-9a44-7911b48be256","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/keys/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.075Z"}],"sources":[{"listingId":"c80bfa14-be53-4391-9a44-7911b48be256","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.075Z","lastSeenAt":"2026-04-22T01:02:18.241Z"}],"details":{"listingId":"c80bfa14-be53-4391-9a44-7911b48be256","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/35 \\\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":"The endpoint returns a 402 challenge with x402 version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/keys/35"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/35"},{"claim":"The platform lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Programmatic access to paid endpoints without subscription or account setup"],"bestFor":["Developers or agents with USDC on Base who want frictionless pay-per-call access","Use cases requiring no sign-up, no API key, and no rate limits","Experimenting with x402 protocol-based API payments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing rather than per-call fees","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.304Z"},"updatedAt":"2026-04-22T01:02:18.241Z"}}