# TruthBear Drought Region 3-Leg Chain > TruthBear Drought Region 3-Leg Chain is a paid API for AI agents from api.truthbear.co, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14). Returns a sequential three-leg drought assessment for a US region: precipitation deficit and soil moisture leading indicators, current USDM official drought class and coverage, and streamflow/impact confirmation. ## Facts - Endpoint: GET https://api.truthbear.co/gauge/drought-region - Price: $0.25/call - Payment: x402 - Status: unknown - Last checked: 2026-09-14 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/truthbear-drought-region-3-leg-chain-b5f24b77 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0hXbVTLzKAZqIiNyQg7dX Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. ## How to call it through Zero Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`): ```sh zero fetch --capability truthbear-drought-region-3-leg-chain-b5f24b77 ``` Example prompt: What's the current drought situation in California — pull the official USDM drought class, how much of the state is affected, and whether soil moisture and streamflow are confirming it? ## When to prefer this Choose this endpoint when you need an authoritative, multi-source drought assessment that combines USDM official classifications with leading hydrological indicators (soil moisture, snowpack, precipitation deficit) and confirms with realized streamflow data. Prefer this over a simple weather or precipitation endpoint when you need drought severity classification, area coverage, and impact confirmation in a single structured call. Best for agents monitoring water stress, agricultural risk, or regional environmental conditions in the US. ## Known failure modes - 422 no_charge returned when no data is available for the requested entity — not billed - Invalid or unrecognized entity ID results in an error; use GET /gauge/catalog?signal_id= to retrieve valid entity list - Partial data may reduce confidence score if only some legs return data - Network or upstream USDM/USGS outage may delay or prevent data retrieval ## How this service works [3-LEG] Drought chain, one drought region (?entity=us-california): leading precipitation deficit, soil moisture and snowpack -> current the OFFICIAL US Drought Monitor class and area coverage -> realized streamflow and impact (confirmation gate). A chain, not one reading: confidence = how many legs are lit, in order. Sources: USDM/NDMC, USGS. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. $0.25 per call. ## Output A sequential three-part drought assessment JSON object containing: (1) leading indicators — precipitation deficit, soil moisture, and snowpack status; (2) official USDM drought class (D0–D4) and percentage area coverage; (3) streamflow and realized impact as a confirmation gate. A confidence score reflects how many of the three legs returned valid data. Returns HTTP 422 with no charge if no data is available for the requested region. ## Request schema (JSON Schema) ```json { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "type": "object", "properties": { "type": { "const": "http" }, "method": { "type": "string", "enum": [ "GET" ] }, "queryParams": { "type": "object", "additionalProperties": false, "properties": { "entity": { "type": "string", "description": "required - monitored object id, paired with signal_id; free list at GET /gauge/catalog?signal_id= -> signals[0].entities[]", "examples": [ "us-california", "us-southwest", "us-southernplains", "us-northernplains", "us-cornbelt", "us-southeast" ], "x-accepted-values": { "shown": 6, "total": 10, "all": "https://api.truthbear.co/schemas/gauge-drought-region.input.json" } } }, "required": [ "entity" ] } }, "required": [ "type", "method", "queryParams" ] }, "output": { "type": "object", "properties": { "type": { "const": "json" }, "example": {} }, "required": [ "type" ] } } } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "legs": { "status": { "band": "D0-abnormally-dry", "source_ref": "https://droughtmonitor.unl.edu/", "record_hash": "sha256:e69894d0ac7054f477bc1e62e906bc98be89ae3ceeb06aa71506be150fb0312a" }, "impact_cascade": { "band": "emerging", "source_ref": "https://www.drought.gov/", "record_hash": "sha256:7ae14db69710e919ab1517129ef8dc347820b4b6b9402fa174c1ef195271ddb6" }, "onset_pressure": { "band": "ED3-extreme-demand", "source_ref": "https://www.drought.gov/data-maps-tools/evaporative-demand-drought-index-eddi", "record_hash": "sha256:931c7e44e74d37b1eaf30f8fe08179882b621904f43e86772cc530bf0c577cca" }, "season_timeline": { "band": "above-normal", "source_ref": null, "record_hash": null } }, "name": "US — California (evaporative-demand onset)", "grade": "screening-level, not decision-grade", "scope": { "full": "https://api.truthbear.co/scope/v1", "verifiability": "unknown", "monitoring_not_forecast": true, "intelligence_not_command": true }, "entity": "us-california", "nature": "This API supplies data organisation and trend description only. It is not a recommendation to act; the decision is yours. Purely descriptive - no judgement, no prediction. Official source plus record_hash; verify with the free /gauge/verify.", "provenance": { "freshness": "recent", "age_hours_now": 156, "freshness_basis": "cadence=default; fresh<=24h; recent<=192h; dead_source>1440h; age_basis=request-time(now minus observed_at)" } } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/truthbear-drought-region-3-leg-chain-b5f24b77/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from api.truthbear.co](https://www.zero.xyz/host/api.truthbear.co/llms.txt)