{"id":"a4fa7b6a-91e0-4986-a066-9dee4ee61b0d","shortId":"Bw36Bw","kind":"x402","title":"x402-gated token data endpoint for LINK on Base, pay $0.02 per request in USDC.","tagline":"x402-gated token data endpoint for LINK on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides premium API access to LINK token data via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and infrastructure utilities — all gated behind x402 micropayments on the Base network.\n\nThe specific endpoint `/api/v1/tokens/LINK` is live and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Payment is made via the x402 \"exact\" scheme, and the endpoint accepts POST requests. The platform advertises no API keys, no rate limits, and instant access — you simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse: the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of what fields the LINK token endpoint actually returns. Based on the platform's categorization under \"Finance & Web3\" and sibling endpoints like `/api/v1/crypto/quotes` and `/api/v1/finance/prices`, it likely returns token price or market data for LINK, but this is inferred rather than documented.","tags":[],"capabilities":["x402-payment","token-data","crypto-price-feed","usdc-base","pay-per-request","no-api-key"],"categories":["finance","crypto"],"synonyms":["LINK price API","Chainlink token data","crypto token quotes","x402 token endpoint","micropayment API","Base USDC API","pay-per-call crypto data"],"warnings":["No API documentation available — docs, pricing, and API pages all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /api/v1/tokens/LINK","Actual response payload is unknown; 'token data' is inferred from sibling endpoint names","Platform appears new or minimally documented; no SLA or uptime guarantees found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/LINK","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/tokens/LINK","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty stubs. The actual data returned by the LINK endpoint is entirely unknown, making this effectively a stub 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'/api/v1/finance/prices':219 '/api/v1/tokens/link':88 '0.02':12,28,116 '000':111 '0x8335':101 '20':110 '2913':102 '402':94 '6':119 'Base USDC API' 'Chainlink token data' 'LINK price API' 'accept':132 'access':40,146 'actual':202 'advertis':137 'ai/ml':68 'amount':108 'analyt':67 'api':39,139,169 'attach':149 'base':10,26,83,104,112,204 'behind':78 'broader':55 'call':63 'categor':209 'challeng':95 'connect':175 'contract':100 'crypto token quotes' 'crypto-price-feed' 'data':5,21,44,66,72,227 'decim':120 'descript':194 'detail':182 'doc':166 'document':161,236 'dozen':58 'endpoint':6,22,34,64,87,131,201,215 'equal':115 'exact':127 'exampl':189 'extrem':163 'field':197 'financ':211 'finance/web3':70 'gate':3,19,77 'header':154 'infer':69,233 'infrastructur':74 'instant':145 'key':140 'like':216,221 'limit':143 'link':8,24,42,199,229 'live':90 'lowpaymentfee.com':36 'made':123 'market':71,226 'maximum':107 'micropay':80 'micropayment API' 'network':84 'no-api-key' 'offer':57 'openapi':186 'page':170 'part':52 'pay':11,27,61 'pay-per-cal':60 'pay-per-call crypto data' 'pay-per-request' 'payload':191 'payment':48,97,121,153,159 'per':13,29,62 'platform':56,136,207 'post':133 'premium':38 'price':167,224 'prompt':177 'proof':160 'protocol':49 'provid':37 'rate':142 'rather':234 'render':172 'request':14,30,96,134 'request/response':190 'return':92,203,222 'scheme':128 'sibl':214 'simpli':148 'span':65 'spars':164 'spec':187 'specif':86 'technic':181 'token':4,20,43,200,223 'token-data' 'unit':113 'usdc':16,32,99,117 'usdc-base' 'use':118 'util':75 'valid':157 'via':45,124 'wallet':176 'web3':212 'x':152 'x-payment':151 'x402':2,18,47,79,126,158 'x402 token endpoint' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"9272c550-b309-4269-b43f-59330e82c39f","listingId":"a4fa7b6a-91e0-4986-a066-9dee4ee61b0d","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/tokens/LINK","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:06.561Z"}],"sources":[{"listingId":"a4fa7b6a-91e0-4986-a066-9dee4ee61b0d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/LINK","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:06.561Z","lastSeenAt":"2026-04-24T03:02:52.364Z"}],"details":{"listingId":"a4fa7b6a-91e0-4986-a066-9dee4ee61b0d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/LINK \\\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 requesting USDC on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/tokens/LINK"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tokens/LINK"}],"useCases":["Fetching real-time LINK token price or market data without API key registration","Integrating pay-per-call crypto data into autonomous agent workflows","Building trading bots that pay per data request on Base"],"bestFor":["Agents or bots needing keyless, on-demand LINK token data","Developers experimenting with x402 micropayment-gated APIs","Low-volume consumers who want no subscription or rate-limit overhead"],"notFor":["High-volume consumers needing bulk historical token data at low marginal cost","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.854Z"},"updatedAt":"2026-04-24T03:02:52.364Z"}}