{"id":"e5033513-6df1-411c-a6d3-caa1080aec2e","shortId":"zkhCUs","kind":"x402","title":"Stablecoin spread data via x402 micropayment on Base (USDC) or Tron (USDT).","tagline":"Stablecoin spread data via x402 micropayment on Base (USDC) or Tron (USDT).","description":"The `/api/stablecoin-spread` endpoint on EruditePay's x402 Bridge returns crypto data intelligence — specifically stablecoin spread information — for a given token. It accepts a POST request with a JSON body containing a `token` field (a token address or symbol) and returns structured JSON with spread data.\n\nPayment is handled via the x402 protocol (HTTP 402 challenge). The endpoint accepts two payment methods: USDC on Base (eip155:8453) at 0.01 USDC per call, or USDT on Tron at 0.01 USDT per call. The provider is Erudite Intelligence LLC, a FinCEN-registered MSB. The x402 facilitator for Base payments is Coinbase CDP.\n\nDocumentation is sparse — the endpoint description in the 402 challenge simply says \"Crypto data intelligence\" and the output example is a generic `{\"success\": true, \"data\": {}}` stub. There is no OpenAPI spec, and the dedicated docs site (`docs.eruditepay.com`) was not reachable during crawl. The exact fields returned in the `data` object are unknown, so callers should expect to discover the response shape experimentally.","tags":[],"capabilities":["stablecoin-spread","crypto-data","x402-payment","base-usdc","tron-usdt","token-lookup","json-api"],"categories":["crypto","data"],"synonyms":["stablecoin spread","crypto spread data","stablecoin price difference","USDC USDT spread","token spread API","crypto arbitrage data","stablecoin peg deviation"],"warnings":["Output schema is a generic stub — actual response fields are undocumented","docs.eruditepay.com was not reachable; /docs path returns endpoint_not_found","Endpoint description is vague: 'Crypto data intelligence' — exact data returned is unclear","No OpenAPI specification available"],"endpointUrl":"https://bridge.eruditepay.com/api/stablecoin-spread","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6961b88476a9b89C4ed97A4aF4D190754d5e70A1","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live (402 challenge captured) with a valid schema for input, but the output is a generic stub with no documented fields. No OpenAPI spec exists, docs site returns errors, and the description is vague ('Crypto data intelligence'). Pricing is clear at $0.01/call but actual response content is 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'0.01':92,101 '402':78,133 '8453':90 'USDC USDT spread' 'accept':46,82 'address':60 'base':8,20,88,120 'base-usdc' 'bodi':53 'bridg':32 'call':95,104 'caller':178 'cdp':124 'challeng':79,134 'coinbas':123 'contain':54 'crawl':166 'crypto':34,137 'crypto arbitrage data' 'crypto spread data' 'crypto-data' 'data':3,15,35,69,138,149,173 'dedic':158 'descript':130 'discov':182 'doc':159 'docs.eruditepay.com':161 'document':125 'eip155':89 'endpoint':27,81,129 'erudit':108 'eruditepay':29 'exact':168 'exampl':143 'expect':180 'experiment':186 'facilit':118 'field':57,169 'fincen':113 'fincen-regist':112 'generic':146 'given':43 'handl':72 'http':77 'inform':40 'intellig':36,109,139 'json':52,66 'json-api' 'llc':110 'method':85 'micropay':6,18 'msb':115 'object':174 'openapi':154 'output':142 'payment':70,84,121 'per':94,103 'post':48 'protocol':76 'provid':106 'reachabl':164 'regist':114 'request':49 'respons':184 'return':33,64,170 'say':136 'shape':185 'simpli':135 'site':160 'spars':127 'spec':155 'specif':37 'spread':2,14,39,68 'stablecoin':1,13,38 'stablecoin peg deviation' 'stablecoin price difference' 'stablecoin spread' 'stablecoin-spread' 'structur':65 'stub':150 'success':147 'symbol':62 'token':44,56,59 'token spread API' 'token-lookup' 'tron':11,23,99 'tron-usdt' 'true':148 'two':83 'unknown':176 'usdc':9,21,86,93 'usdt':12,24,97,102 'via':4,16,73 'x402':5,17,31,75,117 'x402-payment'","prices":[{"id":"240d6fdb-9a23-45e1-a456-f0095768d31e","listingId":"e5033513-6df1-411c-a6d3-caa1080aec2e","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x6961b88476a9b89C4ed97A4aF4D190754d5e70A1","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x6961b88476a9b89C4ed97A4aF4D190754d5e70A1","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:35.573Z"}],"sources":[{"listingId":"e5033513-6df1-411c-a6d3-caa1080aec2e","source":"x402_bazaar","sourceId":"https://bridge.eruditepay.com/api/stablecoin-spread","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:35.573Z","lastSeenAt":"2026-04-22T05:32:27.536Z"}],"details":{"listingId":"e5033513-6df1-411c-a6d3-caa1080aec2e","quickStartSnippet":"curl -X POST https://bridge.eruditepay.com/api/stablecoin-spread \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\n  -d '{\"token\": \"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913\"}'","exampleRequest":{"token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"},"exampleResponse":{"data":{},"success":true},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 v2 challenge accepting USDC on Base and USDT on Tron at 10000 base units each (0.01 USD)","source_url":"https://bridge.eruditepay.com/api/stablecoin-spread"},{"claim":"Provider is Erudite Intelligence LLC, FinCEN MSB registered with BSA ID 31000324258137","source_url":"https://bridge.eruditepay.com"},{"claim":"Base USDC facilitator is Coinbase CDP (https://api.cdp.coinbase.com/platform/v2/x402)","source_url":"https://bridge.eruditepay.com/api/stablecoin-spread"},{"claim":"Input schema requires a 'token' field described as 'Token address or symbol'","source_url":"https://bridge.eruditepay.com/api/stablecoin-spread"}],"useCases":["Querying real-time stablecoin spread data for arbitrage or monitoring","Integrating stablecoin health metrics into trading bots or dashboards","Automated agents paying per-call for on-demand crypto market intelligence"],"bestFor":["Crypto trading bots that need stablecoin spread signals","DeFi dashboards monitoring stablecoin peg stability","AI agents with x402-compatible wallets needing on-demand crypto data"],"notFor":["Users who need free or bulk historical spread data","Non-crypto financial data queries","Applications that cannot settle payments in USDC on Base or USDT on Tron"],"kindDetails":{},"updatedAt":"2026-04-22T01:36:45.005Z"}}