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fix: use scrollHeight for PNG export so legend is never cut #1675

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fix: use scrollHeight for PNG export so legend is never cut #1675

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5b91c8f
fix: end-of-line label collision + padR increase for clean PNG export
Flotapponnier Jul 29, 2026
e64a042
fix(pm): 410 pm-data-freshness, drop dead answer page
Flotapponnier Jul 29, 2026
e99e00e
fix: hide UI chrome (tabs, TopN, header) from PNG export
Flotapponnier Jul 29, 2026
15c263f
fix: use scrollHeight for PNG capture so legend never clips
Flotapponnier Jul 29, 2026
0019556
feat(pm): add Polymarket US (QCX) to bench fleet and PM venue meta
Flotapponnier Jul 29, 2026
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43 changes: 0 additions & 43 deletions answers/which-prediction-market-data-api-is-the-freshest.yml
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31 changes: 24 additions & 7 deletions benchmarks/pm-api-latency.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -4,8 +4,8 @@ slug: pm-api-latency
number: "038"
title: Best prediction market API, ranked by live latency and uptime
seo_title: "Best prediction market API 2026"
seo_description: "Is the Polymarket API up? Live uptime and latency for Polymarket, Kalshi, Limitless, Manifold, Myriad, PredictIt and Smarkets price endpoints."
subtitle: Warm price endpoint latency of seven prediction market venue APIs from three regions, plus a live uptime panel that answers whether each API is up right now.
seo_description: "Is the Polymarket API up? Live uptime and latency for Polymarket, Polymarket US, Kalshi, Limitless, Manifold, Myriad, PredictIt and Smarkets price endpoints."
subtitle: Warm price endpoint latency of eight prediction market venue APIs from three regions, plus a live uptime panel that answers whether each API is up right now.

category: Trading
status: live
Expand Down Expand Up @@ -87,6 +87,9 @@ per_chain_explainer:
- slug: polymarket
h2: Polymarket API latency
body: "Polymarket's CLOB answers its midpoint endpoint at {{p50:polymarket}} p50 over warm connections (24h). The API fronts Cloudflare, so brief origin trouble often appears here as a latency spike before it ever becomes an error, which makes the latency series a useful early status signal. The uptime panel above is a live Polymarket API status check, computed from probes fired every 5 seconds from three regions, so it reacts within seconds of a real outage instead of waiting for user reports. For how the CLOB behaves under bursts, see the pm-rate-limits bench."
- slug: polymarket-us
h2: Polymarket US API latency
body: "Polymarket US (QCX LLC) is the CFTC-regulated DCM launched December 2025 for US residents, separate from Polymarket Global. Its read-only market data gateway at gateway.polymarket.us exposes a public BBO endpoint requiring no API key, which is what this bench probes. The BBO response embeds a lastPriceSample timestamp, making Polymarket US one of two venues in the cohort with verifiable data age. KYC is required for trading but not for market data reads. Current BBO p50: {{p50:polymarket-us}}."
- slug: kalshi
h2: Kalshi API latency
body: "Kalshi's public single market endpoint goes to origin on every request and currently answers at {{p50:kalshi}} p50 warm (24h). That makes its uptime figure here a clean origin measurement, unlike its CDN cached market list. Kalshi is the regulated US venue and the only one in the cohort with a documented API contract, so an unexplained dip in its health gauge is more notable than elsewhere. If Kalshi's API seems down for you, compare the per region figures: a single region dip usually means a network issue, not a venue outage."
Expand All @@ -112,12 +115,13 @@ prometheus:
window: 24h
expected_freshness_seconds: 300

rank_matrix_query: 1000 * label_replace(histogram_quantile(0.50, sum by (venue, region, le) (rate(pmapi_request_duration_seconds_bucket{source="direct",venue=~"polymarket|kalshi|limitless|manifold|myriad|predictit|smarkets",conn="warm",class="price",cache!="hit"}[24h]))), "provider", "$1", "venue", "(.+)")
rank_matrix_query: 1000 * label_replace(histogram_quantile(0.50, sum by (venue, region, le) (rate(pmapi_request_duration_seconds_bucket{source="direct",venue=~"polymarket|polymarket-us|kalshi|limitless|manifold|myriad|predictit|smarkets",conn="warm",class="price",cache!="hit"}[24h]))), "provider", "$1", "venue", "(.+)")

dimensions:
venue:
- { value: all, label: All venues }
- { value: polymarket, label: Polymarket }
- { value: polymarket-us, label: Polymarket US }
- { value: kalshi, label: Kalshi }
- { value: limitless, label: Limitless }
- { value: manifold, label: Manifold }
Expand All @@ -134,29 +138,29 @@ metric_panels:
- id: uptime_24h
label: Uptime 24h
description: "Share of probe cycles that succeeded over the last 24 hours, averaged across the three probe regions. 100 percent means every 5 second probe of the venue's API came back healthy."
metric: 100 * avg(avg_over_time(pmapi_health{source="direct",venue=~"polymarket|kalshi|limitless|manifold|myriad|predictit|smarkets"}[24h]))
metric: 100 * avg(avg_over_time(pmapi_health{source="direct",venue=~"polymarket|polymarket-us|kalshi|limitless|manifold|myriad|predictit|smarkets"}[24h]))
label_key: venue
unit: pct
higher_is_better: true
- id: uptime_7d
label: Uptime 7d
description: "Same health gauge averaged over 7 days. Short outages that vanish from the 24h figure stay visible here for a week."
metric: 100 * avg(avg_over_time(pmapi_health{source="direct",venue=~"polymarket|kalshi|limitless|manifold|myriad|predictit|smarkets"}[7d]))
metric: 100 * avg(avg_over_time(pmapi_health{source="direct",venue=~"polymarket|polymarket-us|kalshi|limitless|manifold|myriad|predictit|smarkets"}[7d]))
label_key: venue
unit: pct
higher_is_better: true
- id: uptime_30d
label: Uptime 30d
description: "Same health gauge averaged over 30 days. Feeds the ledger's 30d window toggle so a one-hour outage that's already aged out of the 24h panel still shows up in the table over a month."
metric: 100 * avg(avg_over_time(pmapi_health{source="direct",venue=~"polymarket|kalshi|limitless|manifold|myriad|predictit|smarkets"}[30d]))
metric: 100 * avg(avg_over_time(pmapi_health{source="direct",venue=~"polymarket|polymarket-us|kalshi|limitless|manifold|myriad|predictit|smarkets"}[30d]))
label_key: venue
unit: pct
higher_is_better: true
tab: false
- id: cold_connect_p50
label: Cold connect
description: "TCP plus TLS handshake time on the once a minute cold probe with keep alives disabled. The startup cost a brand new client pays before its first request."
metric: 1000 * histogram_quantile(0.50, sum(rate(pmapi_request_connect_seconds_bucket{source="direct",venue=~"polymarket|kalshi|limitless|manifold|myriad|predictit|smarkets"}[24h])) by (le))
metric: 1000 * histogram_quantile(0.50, sum(rate(pmapi_request_connect_seconds_bucket{source="direct",venue=~"polymarket|polymarket-us|kalshi|limitless|manifold|myriad|predictit|smarkets"}[24h])) by (le))
label_key: venue
unit: ms
higher_is_better: false
Expand All @@ -183,6 +187,19 @@ providers:
sample_size: sum(increase(pmapi_requests_total{venue="polymarket",source="direct",class="price",conn="warm",outcome!="probe_invalid"}[24h]))
series: 1000 * histogram_quantile(0.50, sum(rate(pmapi_request_duration_seconds_bucket{venue="polymarket",source="direct",class="price",conn="warm",cache!="hit"}[1h])) by (le))

- slug: polymarket-us
name: Polymarket US
tag: CFTC DCM (QCX LLC), USD settlement, KYC required for trading; market data public via gateway.polymarket.us
formula: "p50 of warm round trips against the BBO endpoint for the pinned market, no auth required, 24h window. Separate from Polymarket Global: different API, different settlement, different regulatory regime."
queries:
p50: 1000 * histogram_quantile(0.50, sum(rate(pmapi_request_duration_seconds_bucket{venue="polymarket-us",source="direct",class="price",conn="warm",cache!="hit"}[24h])) by (le))
p90: 1000 * histogram_quantile(0.90, sum(rate(pmapi_request_duration_seconds_bucket{venue="polymarket-us",source="direct",class="price",conn="warm",cache!="hit"}[24h])) by (le))
p99: 1000 * histogram_quantile(0.99, sum(rate(pmapi_request_duration_seconds_bucket{venue="polymarket-us",source="direct",class="price",conn="warm",cache!="hit"}[24h])) by (le))
mean: 1000 * sum(rate(pmapi_request_duration_seconds_sum{venue="polymarket-us",source="direct",class="price",conn="warm",cache!="hit"}[24h])) / sum(rate(pmapi_request_duration_seconds_count{venue="polymarket-us",source="direct",class="price",conn="warm",cache!="hit"}[24h]))
success: clamp_max(sum(rate(pmapi_requests_total{venue="polymarket-us",source="direct",class="price",conn="warm",outcome="ok"}[24h])) / sum(rate(pmapi_requests_total{venue="polymarket-us",source="direct",class="price",conn="warm",outcome!="probe_invalid"}[24h])), 1)
sample_size: sum(increase(pmapi_requests_total{venue="polymarket-us",source="direct",class="price",conn="warm",outcome!="probe_invalid"}[24h]))
series: 1000 * histogram_quantile(0.50, sum(rate(pmapi_request_duration_seconds_bucket{venue="polymarket-us",source="direct",class="price",conn="warm",cache!="hit"}[1h])) by (le))

- slug: kalshi
name: Kalshi
tag: Regulated US venue, single market endpoint goes to origin on every request
Expand Down
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