{"uid":"cap_UIdFfolnDjsuPFrWoOtLG","slug":"ysaere-agent-text-stamp-81aaf88c","name":"Ysaere Agent Text Stamp","description":"Ysaere Agent Text Stamp — $0.02 USDC, no account needed. Input: {\"text\":\"the exact text to stamp\"}. Returns a signed hash of that text. The text is not stored. Empty text is refused. No payment was taken until the text is accepted. Wallet only. No account price.","url":"https://api.ysaere.com/v1/notary/stamp-text?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"text":{"type":"string","description":"Text to hash and stamp (up to 64 KB)"},"label":{"type":"string","description":"Optional human-readable label (up to 160 chars)"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_KfzIhFp6u3uVupxJQDn5y","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a cryptographically signed hash receipt for a given text string, serving as a timestamped proof-of-existence for that exact text.","exampleAgentPrompt":"Please stamp this text so I have a signed proof-of-existence for it: 'I, Jane Doe, agree to the terms outlined in this partnership proposal as of today.'","exampleUseCases":[{"title":"Timestamping a contract clause","prompt":"Stamp this exact clause so we have cryptographic proof it existed today: 'Licensor grants Licensee a non-exclusive, worldwide right to use the Software under the terms herein.'"},{"title":"Proof-of-authorship for creative work","prompt":"I just finished writing this tagline and want to prove I created it today — can you notarize this text: 'Where every journey begins with a single step forward.'"},{"title":"Audit trail for a compliance statement","prompt":"Create a tamper-evident stamp for this compliance declaration: 'As of this date, our data retention policy complies with GDPR Article 17 requirements.' I need the signed receipt for our audit log."}],"resultDescription":"A signed hash receipt containing a cryptographic hash of the submitted text and a timestamp signature, serving as verifiable proof-of-existence. The original text is not stored by the service. The receipt can be used to verify that the exact text existed at the time of stamping.","failureModes":["Empty text input is rejected with an error before payment is taken","Text exceeding 64 KB limit is refused","Payment failure via x402 wallet results in no receipt being issued","Malformed JSON input returns a validation error","Network timeout before signing completes"],"whenToPreferThis":"Use this endpoint when you need lightweight, per-call text notarization with no account setup, no text storage, and a flat $0.02 USDC cost. Prefer it over the sibling hash-only stamp endpoint when the input is raw text rather than a pre-computed hash. Ideal for agents that need tamper-evident audit trails for dynamic text without any persistent registration.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T12:39:35.018Z","isFirstParty":false,"canonicalSlug":"ysaere-agent-text-stamp-81aaf88c"}