{"uid":"cap_kGsByAUMbF3TbQwfo70yY","slug":"blinded-macaroon-signer-mcp-c477587d","name":"Blinded Macaroon Signer MCP","description":"The premier global index of 1,069 monetized MCP nodes across 205 specialized subdomains. Gasless USDC runtime settlements via x402 V2 Spec on Base L2. Save 95% token context.","url":"https://api.m2mcent.com/blinded-macaroon-signer-mcp/api/process","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"payload":{"type":"string"}}},"responseSchema":{"type":"json","example":{"success":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.25","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.25/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.25","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.25","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_reuoxfHZ3wjdz_hdwQ1qH","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.25","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Signs a blinded macaroon token, enabling privacy-preserving authentication and authorization workflows.","exampleAgentPrompt":"Can you blind-sign this macaroon token data for me so I can use it in a privacy-preserving authentication flow? Here's the blinded data string to process.","exampleUseCases":[{"title":"Anonymous credential issuance for users","prompt":"I need to issue a blind-signed macaroon credential to a user without learning their identity — can you run this blinded token data through the blinded macaroon signer?"},{"title":"Privacy-preserving API access token","prompt":"Sign this blinded macaroon so my app can grant API access to users without tying the token back to their identity during the signing step."},{"title":"Blind voting or attestation token","prompt":"I'm building a system where participants get signed tokens without the signer knowing who they are — please blind-sign this macaroon data string for the next participant."}],"resultDescription":"Returns a signed version of the submitted blinded macaroon data, which the requesting party can then unblind to obtain a valid, issuer-signed macaroon credential usable for authentication or authorization.","failureModes":["Invalid or malformed blinded macaroon data returns an error response","Empty or missing 'data' field causes a validation failure","Malformed base64 or encoding issues in the input string may cause processing errors","Payment failure or insufficient funds results in a 402 response before processing","Oversized input data may be rejected with a payload-too-large error"],"whenToPreferThis":"Choose this endpoint when you need a cryptographic blind-signing service for macaroon tokens — specifically when implementing privacy-preserving authentication flows where the signer must not learn the content of the token being signed. Prefer this over standard macaroon signing when anonymity or unlinkability between the signing and usage phases is a requirement.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T07:15:00.231Z","isFirstParty":false}