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For freshness always use provenance.age_hours_now (computed at request time) and provenance.freshness; the threshold basis is in provenance.freshness_basis"},"standard_ruler":{"type":["object","null"],"description":"Official standard ruler (band / thresholds / normalized_index / pct_to_action, with unit and provenance); null when the line has no official ruler. Inner structure varies by signal"},"hash_core_version":{"type":["integer","null"],"description":"Core-contract version of record_hash (currently 3); use it to pick the right core composition when recomputing offline"},"source_agreement_cv":{"type":["number","null"],"description":"Multi-source agreement, coefficient of variation (smaller = closer agreement). Present ONLY when two or more CONFIRMED-INDEPENDENT sources measure the same fact at the same time - see sources[].independent. 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Per-row shape is in items - the fields live INSIDE items, not at the top level"},"count":{"type":"integer","description":"Number of rows (all objects for this signal)"},"grade":{"type":["string","null"],"description":"Honest data-grade disclosure (e.g. \"screening-level, not decision-grade\")"},"scope":{"type":["string","null"],"description":"Honest statement of scope and limits: monitoring is not forecasting, intelligence is not instruction, and the boundary of what is verifiable"},"nature":{"type":"string","description":"Neutrality statement: GAUGE supplies observations and trend description only - no judgement, no prediction, no recommendation"},"_citation":{"type":["object","null"],"description":"Offline-verifiable citation: {statement_type, not_advice:bool, claim, fact, source, record_hash, signature(Ed25519), key_id, issuer_DID(did:key), verify_url} - the trust root for zero-trust self-verification"}},"additionalProperties":true,"conditionalProperties":{"last_fact":{"type":["object","null"],"description":"Most recent qualifying fact for this line and entity, attached centrally (may be absent when the line has no qualifying fact yet)"},"decision_points":{"type":["object","null"],"description":"Swappable decision points for this entity, attached centrally: {count, points:[{tag,current,swappable,how}], note}. Present only when the entity has at least one swappable tag in the index, so bundles for entities without one omit it"},"leg_availability":{"type":["object","null"],"description":"Per-leg degradation disclosure: which legs are present, which are degraded and why. Present only when at least one leg is degraded"},"record_hash_verifiable":{"type":["object","null"],"description":"Whether this response can recompute its own record_hash offline. Present only when the payload carries a top-level record_hash; may be absent on list-shaped deliveries where verifiability is stated per row instead"}}},"routeTemplate":"/gauge/census","priceUsdNumber":0.09}},"description":"[BATCH+PROOF] All entities for one signal at their latest reading, with band, frequency_label and percentile columns so you can rank across stations and screen for the unusual in one call. Cross-station comparison is the point: one river gauge alone tells you little, 200 of them ranked by distance-to-action tells you a lot. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. $0.09 per call.","outputSchema":{"input":{"type":"http","method":"GET","example":{"signal_id":"hydrology.river-level"},"required":["signal_id"],"properties":{"signal_id":{"type":"string","examples":["hydrology.river-level"],"description":"required - signal id (genus.species); free list at GET /gauge/catalog (paged; ?all=1 for every line)"}},"queryParams":{"signal_id":"required - signal id (genus.species); free list at GET /gauge/catalog (paged; ?all=1 for every line)"},"discoverable":true,"exampleRequest":"/gauge/census?signal_id=hydrology.river-level"},"output":{"type":"object","required":["count","rows"],"properties":{"rows":{"type":"array","items":{"type":"object","properties":{"change":{"type":["object","null"],"description":"Change, nested per metric: change.<metric> = {delta, direction, direction_reason?}, plus the scalar change.period (e.g. \"vs_previous\"). direction is one of rising/falling/stable/unknown - unknown means the direction CANNOT BE DETERMINED, it does not mean stable; in that case direction_reason carries a machine-readable cause: no-previous-record / metric-absent-in-previous / metric-absent-in-current / non-numeric-value"},"entity":{"type":"string","description":"Monitored object id (e.g. btc / us / hormuz); full list at free /gauge/catalog or /gauge/preview"},"strata":{"type":["object","null"],"description":"Statistical strata: share of each official band over the last 5 same-season years plus the band the current value falls in; null when there are no statistics"},"current":{"type":["object","null"],"description":"Current reading. The inner metric structure varies by signal (crypto -> {price_usd, volume_24h, ...}; shipping -> {wind_kmh, wave_height_m, ...}). Units are carried in the field-name suffix; see also standard_ruler.unit"},"sources":{"type":["array","null"],"items":{"type":"object"},"description":"Source list [{name, value, weight, as_of, role, independent, relay_of?}]. independent:true = confirmed independent source; false = confirmed relay channel of another source (relay_of names the origin); null = independence unconfirmed (neither denied nor claimed). name/weight/independent/relay_of are record_hash core fields, so tampering with an independence claim breaks self-verification; as_of/value/role drift easily and are not hashed"},"previous":{"type":["object","null"],"description":"Previous-period reading (a subset of the metrics in current; or {note} explaining that there is no previous value)"},"trend_7d":{"type":["array","null"],"items":{"type":"object"},"description":"Array of the last 7 trend points; [] means this signal has no series yet or the series does not apply - it is not an error"},"lifecycle":{"type":["object","null"],"description":"Lifecycle block (state / birth_at / end_at / death_type / context). Part of the record_hash v3 core, so offline recomputation must include it; null for non-lifecycle lines"},"signal_id":{"type":"string","description":"Signal id in genus.species ASCII binomial form (e.g. crypto.spot / macro.unemployment / shipping.route-disruption); full list at free /gauge/catalog"},"ots_status":{"type":["string","null"],"description":"RETIRED FIELD - always \"pending\" or null; this field is no longer updated and is kept only for older parsers. Anchoring is done per write-batch (previously one root per day): each batch of writes gets a Merkle root stamped via OpenTimestamps, typically confirmed into a Bitcoin block within hours. 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Per-row shape is in items - the fields live INSIDE items, not at the top level"},"count":{"type":"integer","description":"Number of rows (all objects for this signal)"},"grade":{"type":["string","null"],"description":"Honest data-grade disclosure (e.g. \"screening-level, not decision-grade\")"},"scope":{"type":["string","null"],"description":"Honest statement of scope and limits: monitoring is not forecasting, intelligence is not instruction, and the boundary of what is verifiable"},"nature":{"type":"string","description":"Neutrality statement: GAUGE supplies observations and trend description only - no judgement, no prediction, no recommendation"},"_citation":{"type":["object","null"],"description":"Offline-verifiable citation: {statement_type, not_advice:bool, claim, fact, source, record_hash, signature(Ed25519), key_id, issuer_DID(did:key), verify_url} - the trust root for zero-trust self-verification"}},"additionalProperties":true,"conditionalProperties":{"last_fact":{"type":["object","null"],"description":"Most recent qualifying fact for this line and entity, attached centrally (may be absent when the line has no qualifying fact yet)"},"decision_points":{"type":["object","null"],"description":"Swappable decision points for this entity, attached centrally: {count, points:[{tag,current,swappable,how}], note}. Present only when the entity has at least one swappable tag in the index, so bundles for entities without one omit it"},"leg_availability":{"type":["object","null"],"description":"Per-leg degradation disclosure: which legs are present, which are degraded and why. Present only when at least one leg is degraded"},"record_hash_verifiable":{"type":["object","null"],"description":"Whether this response can recompute its own record_hash offline. Present only when the payload carries a top-level record_hash; may be absent on list-shaped deliveries where verifiability is stated per row instead"}}}},"maxAmountRequired":"90000","maxTimeoutSeconds":300},"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x2d16a243ba9fAcC6AC85519d5efad2149DC4C6c3","scheme":"exact","network":"base","amountAtomic":"90000"}],"bazaar_compatible":false,"bazaar_validated_at":"2026-10-15 11:56:58.498+00","bazaar_validation_error":"missing Bazaar extension"},"sonar_metrics":{"score":0.8172,"uptime":1,"paid_success_rate":0,"valid_result_rate":null,"latency_p50":300,"latency_p90":1002,"price_drift_pct":0},"cdp_indexed":false,"confidence":"high"}