{"uid":"cap__8mlPWuTy5qsGt9o_FDbt","slug":"d21-signal-delta-7425103b","name":"d21 signal_delta","description":"GO-TO PRODUCT: what changed in the Daily Agent Signal since a date you read: complete added, changed (fields plus before/after) and removed records, diffed against our stored archive. Body { since_date }. Free first: /v1/signal_delta/availability?since_date= (absent baseline is 422, no charge) and /v1/signal_delta/example.","url":"https://draconic21-x402-api.onrender.com/v1/signal_delta?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"since_date":{"type":"string","format":"date","description":"Stored baseline date in YYYY-MM-DD format; check free availability first."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_AxovcNOsJyo6O3l1bjxJ_","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a complete diff of the Daily Agent Signal since a specified date — all added, changed (with before/after field values), and removed records — against a stored archive baseline.","exampleAgentPrompt":"Pull me the full signal delta from the Daily Agent Signal since 2025-06-10 — I need to see everything that was added, removed, or changed with before-and-after values.","exampleUseCases":[{"title":"Weekly signal change review","prompt":"What changed in the Daily Agent Signal since 2025-06-09? Show me all new entries, dropped records, and any fields that were updated with the before and after values."},{"title":"Monitoring agent market shifts","prompt":"I last read the Daily Agent Signal on 2025-05-20 — pull me everything that's been added, removed, or modified since then so I can see how the market has shifted."},{"title":"Automated delta ingestion pipeline","prompt":"Give me the complete diff of the Daily Agent Signal since 2025-06-01 — I need the full set of added, changed, and removed records to sync my database."}],"resultDescription":"A structured diff object containing three categories: added records (new entries since the baseline date), changed records (modified entries with per-field before/after values), and removed records (entries no longer present) — all compared against the stored archive for the given since_date.","failureModes":["422 Unprocessable Entity if no stored baseline exists for the provided since_date (check /v1/signal_delta/availability?since_date= first, free of charge)","Invalid date format (must be YYYY-MM-DD) returns a validation error","Date too recent or too old may yield empty or unavailable baseline","Payment failure (x402) blocks access to the paid endpoint"],"whenToPreferThis":"Use this endpoint when you need a precise, field-level diff of the Daily Agent Signal since a known date — especially for incremental sync, change monitoring, or audit use cases. Prefer this over re-fetching the full signal snapshot when you already have a stored baseline date and want only what changed. Use /v1/signal_delta/availability first to confirm a baseline exists before paying.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-27T13:03:53.102Z","isFirstParty":false,"canonicalSlug":"d21-signal-delta-7425103b"}