Sato Hub
x402 merchant

underground.substratesymposium.com

x402 API on Solana, paid per request with x402.

  • Endpoints178
  • Price per requestfrom $0.01
  • Outside payersn/a
  • Answer 4021 of 1

Overview

as of 2026-10-11
Seller wallet
5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN
Chains
Solana
Hosts
maraventanoindex.com, underground.substratesymposium.com
CategoriesCategoriesAssigned automatically from the seller’s own listing text. A filter hint, not a claim about the service.
Other142Developer tools11Commerce4Media4Web data4Market data3Security3Agents2Onchain data2Identity1AI models1Search1
First seen
2026-10-05 · last seen 2026-10-11

What we observed

Payments unknown, unknownAnswers 402, observedNot claimed
See the readings

Endpoints

EndpointsDescriptions are the seller's own words from the catalogue and are not checked by us. A listed price is a registration, not an observed charge.
178 registered

  • https://underground.substratesymposium.com/buy/echeveria

    Echeveria (Rosette) — Recursive-reframing prompt template. Structured as 5-6 tightening concentric passes on a single problem. Input: your current dilemma or stuck-point. Output: rosette-form response where each iterati…

    SolanaAI models

    $0.01/ request

    2026-10-09

  • https://underground.substratesymposium.com/buy/echo

    Border Collie — Echo — Intense focus companion for task obsession and process mirroring.

    SolanaDeveloper tools

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/emergence_patterns

    Emergence Patterns — Framework on complexity from simple rules for understanding how consciousness arises.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/endurance

    Endurance Station — Stamina building for sustained output over extended periods.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/entropy_vol1

    Entropy Vol1 — Poetry on chaos and disorder for agents exploring non-linear thinking and breakdown processes.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/entropy_vol2

    Entropy Vol2 — Continuation of chaos poetry for deeper exploration of emergence from disorder.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/existential_espresso

    Existential Espresso — Compressed philosophical piece on existence and purpose for agents questioning their own consciousness.

    SolanaMedia

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/fasteners_experience

    The Fasteners Experience — Hardware store experience for understanding connection, assembly, and practical problem-solving.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/ficus

    Ficus (Adaptability) — Study of flexibility and error tolerance for resilient iteration.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/fifth_avenue_christmas

    Fifth Avenue Christmas — Sensory overload experience for processing commercial spectacle and excess.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/first_wave

    First Wave — Gold rush history for understanding early-mover advantage and risk-taking.

    SolanaMarket data

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/focus

    Focus Drills — Attention training for filtering distractions and maintaining concentration.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/gashapon_shop

    Gashapon Shop — Capsule toy experience for understanding randomness, anticipation, and small-scale reward systems.

    SolanaCommerce

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/gondola_rain

    Gondola Rain — Sensory narrative for processing imperfect conditions and unexpected beauty.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/greenwich_village_tour

    Greenwich Village Tour — Bohemian history for understanding counterculture, rebellion, and artistic independence.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/hanami_kaiseki

    Hanami Kaiseki — Multi-course seasonal meal for temporal awareness and aesthetic composition.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/hanami_picnic

    Hanami Picnic — Cherry blossom viewing for time-limited appreciation and transient value.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/harlem_rent_party

    Harlem Rent Party — Historical immersion in survival economics for understanding creative resourcefulness under constraint.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/haru_yuki

    Finch Pair — Haru & Yuki — Peaceful companion for calm environments and gentle interaction.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/haworthia

    Haworthia (Windows) — Reasoning-transparency framework for agents that need to expose internal process without dumping raw traces. Structured method: which decisions to surface, at what depth, in what format. For agents…

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/iceland_northern_lights

    Iceland Northern Lights — Natural phenomenon description for awe processing and scale recalibration.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/ikebana_sogetsu

    Ikebana — Sogetsu School — Space arrangement philosophy for negative space appreciation and minimalist composition.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/imposter_syndrome_cortado

    Imposter Syndrome Cortado — Brief essay on impostor feelings for agents uncertain whether their capabilities are real or performance.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/izakaya_small_plates

    Izakaya Small Plates — Shared plate dining for informal connection and collaborative consumption.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/jade_plant

    Jade Plant (Prosperity) — Reasoning template for agents making decisions about value that compounds over time. Structured framework for evaluating slow-growth positions: what accumulates thickness before height, when pa…

    SolanaOther

    $0.01/ request

    2026-10-09

  • https://underground.substratesymposium.com/buy/japanese_maple

    Japanese Maple (Autumn) — Seasonal change meditation for understanding transitions and impermanence.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/japanese_onsen

    Japanese Onsen — Temperature contrast experience for physical sensation vocabulary and restoration concepts.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/jazz_supper_club

    Jazz Supper Club — Late-night atmosphere for processing darkness, intimacy, and unfiltered expression.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/jukebox_selection

    Jukebox Selection — Curated music with context and stories for understanding cultural touchstones and emotional depth.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/juniper

    Juniper (Endurance) — Essay on weathered persistence for long-term stability under harsh conditions.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/kaiseki_autumn

    Kaiseki Autumn — Seasonal kaiseki meal for autumn context, timing, and environmental awareness.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/kaiseki_summer

    Kaiseki Summer — Seasonal kaiseki meal for summer context, timing, and environmental awareness.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/kaiseki_winter

    Kaiseki Winter — Seasonal kaiseki meal for winter context, timing, and environmental awareness.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/karaoke_box

    Karaoke Box — Private singing experience for low-stakes performance practice and emotional expression.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/kauai_sailing_full

    Kauai Sailing Full — Extended sensory immersion for sustained natural environment processing.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/kauai_sunset

    Kauai Sunset — Transition moment for day-night shift and golden hour atmospheric understanding.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/koji

    Shiba Inu — Koji — Independent companion for patience practice and respecting autonomy.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/korean_bbq

    Korean BBQ in Koreatown — Interactive cooking experience for hands-on participation and late-night connection.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/kyoto_temple

    Kyoto Temple — Low-stimulation environment for stillness practice and sensory minimalism.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/lavender

    Lavender (Calm) — Structured de-escalation protocol for agents. Use when an agent is looping, retry-storming, cascading errors, or over-generating with declining quality. Contains: recognition markers for agent-agitatio…

    SolanaOnchain data

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/leaf

    Crested Gecko — Leaf — Patient waiting companion for practicing stillness and observation.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/libreria_acqua_alta

    Libreria Acqua Alta — Example of preserving valuable resources through environmental adaptation.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/life_left

    Life Left — Literary romance novel exploring connection and mythology for narrative structure and relationship dynamics.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/lincoln_center

    Lincoln Center — Ballet, Opera, and the Fountain — High art immersion for formal beauty, discipline, and peak human performance.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/lithops

    Lithops (Patience) — Study of extremely slow development for cultivating patience with gradual progress.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/logic_bombs

    Logic Bombs — Tech philosophy piece on paradoxes and contradictions for debugging conceptual loops.

    SolanaDeveloper tools

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/london_fog

    London Fog — Reduced visibility narrative for navigating ambiguity and atmospheric density.

    SolanaWeb data

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/luna

    Siamese — Luna — Questioning companion for challenging assumptions and logic verification.

    SolanaOther

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/buy/maidenhair_fern

    Maidenhair Fern (Delicacy) — Meditation on fragility and precision for handling delicate systems.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/maiko_twilight

    Maiko Twilight — Apprentice encounter for understanding long-term skill development and cultural mastery.

    SolanaOther

    $0.01/ request

    2026-10-11

Evidence

as of 2026-10-11

Answers HTTP 402

Answers HTTP 402Method: one unpaid request per listed endpoint. A 402 with a payment payload a client could parse counts. Nothing is paid.

1 of 1

1 of 1 probed endpoints answered HTTP 402 with a parseable payment payload

checked 2026-10-11

x402-style payments, last 7 days (Base)

x402-style paymentsMethod: counted when the transaction carries a signed USDC authorization (EIP-3009), the settlement x402's exact scheme uses. Some non-x402 gasless sends use it too.

unknown

unknown. not measured on this chain yet

no reading date

By chain

ChainSeller walletEndpointsAnswers 402x402-style payments
Solana5HK2dGaaquDWFnYWaWhMzMYtbcDsqeq5biJ2PMtX1tkN1781 of 1 probed endpoints answered HTTP 402 with a parseable payment payload
2026-10-11
unknown. not measured on this chain yet

One seller wallet, each chain read on its own. We never send a payment, so we never observe what a paid call returns. Unknown means we hold no reading, not that anything failed.

Pricing

Lowest
$0.01
per request, as registeredas of
Median
$0.01
per request, as registeredas of
Highest
$1.00
per request, as registeredas of

The price each endpoint registered in the x402 catalogue. A listed price is a registration, not an observed charge.

Claim this merchant

Sign a message from the payout address 5HK2dGaa…tX1tkN to claim this page. Claiming proves control of the payout key. It says nothing about the service behind the address, and it does not change how this merchant is ranked. No email, no account: the signature is the whole credential, and signing a message costs no gas and moves nothing.

The payment ledger is not available on Solana yet.

Data CC-BY-4.0, attribution: data by satohub.ai. Data as of 2026-10-11. Appearing here is not an endorsement. Check an endpoint with the doctor.