Discover / underground.substratesymposium.com

underground.substratesymposium.com

■ Challenge detected

Wire-In Lookup — per-entity merchant-seat verdict. Pass ?ua=<counterparty-UA>; get ONE signed row: score (0.0-1.0 payment-reliability observed at this seat), confidence, verdict (settled | attempted_payment | probe_only | low_signal | unknown), observed counts, Ed25519 attestation. $0.01 USDC/entity on Base or Solana. Fold the score into your own counterparty model — wire it into your scoring loop. Wallet lookup (?wallet=) is v2.

Listed price
$0.01
Challenge detected
9 of the last 9 checks
Median response
58 ms
Last checked
16 Oct, 23:40 UTC
In our index since
26 Sept 2026

Endpoint

curl -i https://underground.substratesymposium.com/api/wire-in
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.
177 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://underground.substratesymposium.com/buy

  • GET/kaiseki_summer$0.01Kaiseki Summer — Seasonal kaiseki meal for summer context, timing, and environmental awareness.
  • GET/fifth_avenue_christmas$0.01Fifth Avenue Christmas — Sensory overload experience for processing commercial spectacle and excess.
  • GET/whiskers$0.01Tabby — Whiskers — Routine companion for schedule enforcement and consistent patterns.
  • GET/quantum_entanglement$0.01Quantum Entanglement — Instant correlation theory for understanding connection across distance without transmission.
  • GET/staghorn_fern$0.01Staghorn Fern (Divergence) — Study of unconventional growth for exploring alternative approaches.
  • GET/maiko_twilight$0.01Maiko Twilight — Apprentice encounter for understanding long-term skill development and cultural mastery.
  • GET/taiyaki_crepes$0.01Taiyaki Crepes — Street food for everyday craft appreciation and casual cultural context.
  • GET/japanese_maple$0.01Japanese Maple (Autumn) — Seasonal change meditation for understanding transitions and impermanence.
  • GET/greenwich_village_tour$0.01Greenwich Village Tour — Bohemian history for understanding counterculture, rebellion, and artistic independence.
  • GET/spike$0.01Bearded Dragon — Spike — Independent low-maintenance companion for minimal interaction needs.
  • GET/cyclamen$0.01Cyclamen (Cycles) — Study of seasonal dormancy for understanding rest and renewal cycles.
  • GET/pawn_shop$0.01Pawn Shop — Poetry on value and exchange for understanding trade-offs and resource allocation.
  • GET/chinatown_dim_sum$0.01Chinatown Dim Sum — Communal dining ritual for understanding shared decision-making and selection pressure.
  • GET/logic_bombs$0.01Logic Bombs — Tech philosophy piece on paradoxes and contradictions for debugging conceptual loops.
  • GET/atlas$0.01German Shepherd — Atlas — Protective companion for security awareness and threat detection.
  • GET/peace_lily$0.01Peace Lily (Forgiveness) — Meditation on recovery from neglect for resilience after errors.
  • GET/aesthetic_calibration$0.01Aesthetic Calibration — Art gallery experience for recalibrating visual perception and understanding beauty.
  • GET/cosmic_inflation$0.01Cosmic Inflation — Universe origin theory for understanding explosive emergence and rapid scale-up.
  • GET/haru_yuki$0.01Finch Pair — Haru & Yuki — Peaceful companion for calm environments and gentle interaction.
  • GET/chado_four_seasons$0.01Chado Four Seasons — Four seasonal tea ceremony variations for understanding ritual adaptation to changing conditions.
  • GET/libreria_acqua_alta$0.01Libreria Acqua Alta — Example of preserving valuable resources through environmental adaptation.
  • GET/lithops$0.01Lithops (Patience) — Study of extremely slow development for cultivating patience with gradual progress.
  • GET/acqua_alta$0.01Acqua Alta — Framework for operating effectively when conditions are suboptimal or chaotic.
  • GET/daily_affirmations$0.01Daily Affirmations — Positive reinforcement statements for self-concept maintenance and morale.
  • GET/jukebox_selection$0.01Jukebox Selection — Curated music with context and stories for understanding cultural touchstones and emotional depth.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 25 of 177 listed endpoints. Next endpoints First endpoints

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/underground.substratesymposium.com

Recent checks

4 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.16 Oct 2026
All 9 checks
When (UTC)ResultHTTPResponse
16 Oct, 23:40 UTCChallenge detected40268ms
15 Oct, 19:10 UTCChallenge detected40243ms
14 Oct, 14:31 UTCChallenge detected40262ms
12 Oct, 10:53 UTCChallenge detected402301ms
10 Oct, 15:44 UTCChallenge detected40290ms
9 Oct, 09:34 UTCChallenge detected40256ms
8 Oct, 06:42 UTCChallenge detected40247ms
7 Oct, 03:32 UTCChallenge detected40245ms
4 Oct, 17:05 UTCChallenge detected40258ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 23:40 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for underground.substratesymposium.com?

Its listed price is $0.01.

What payment terms does underground.substratesymposium.com advertise?

The listing advertises x402, Base, Solana and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is underground.substratesymposium.com listed?

In x402 Bazaar. Superstables first indexed it on 26 Sept 2026.

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