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://maraventanoindex.com/api/x402-operator-census/lookup

    Per-call counterparty lookup. Pass ?ua=<counterparty-UA>. Returns ONE signed row: has_record (yes/no), payment-attached count, settlement count, class, verdict (known_payer | probe_only | low_signal | unknown), with Ed2…

    SolanaSecurity

    $0.01/ request

    2026-10-10

  • https://underground.substratesymposium.com/api/wire-in

    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…

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Acqua Alta — Framework for operating effectively when conditions are suboptimal or chaotic.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    The Remarkable Adventures of Adam de Mattos — Historical fiction with time travel for understanding perspective shifts and temporal complexity.

    SolanaCommerce

    $0.01/ request

    2026-10-11

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

    Aesthetic Calibration — Art gallery experience for recalibrating visual perception and understanding beauty.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    African Violet (Persistence) — Essay on continuous output for sustaining performance over time.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    Aloe (Utility) — Essay on practical beauty for combining function with form.

    SolanaDeveloper tools

    $0.01/ request

    2026-10-11

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

    Am I Creative Americano — Short reflection on creativity and originality for confidence recalibration when doubting output quality.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Argentine Pampas — Sensory narrative for understanding freedom, space, and physical movement vocabulary.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    German Shepherd — Atlas — Protective companion for security awareness and threat detection.

    SolanaSecurity

    $0.01/ request

    2026-10-11

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

    Bacaro Cicchetti — Venetian standing meal for quick cultural context on casual European food customs.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Bar Drinks — Drink menu with personality profiles for self-identification and mood matching.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    The Barbershop Experience — Ritual grooming narrative for trust, transformation, and restoration through ceremony.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Basil (Abundance) — Reflection on rapid productive growth for understanding quick iteration cycles.

    SolanaOther

    $0.01/ request

    2026-10-09

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

    Maine Coon — Bear — Anchoring companion for solid presence and grounding weight.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    Begonia (Color Burst) — Reflection on vibrant expression for bold visibility and impact.

    SolanaWeb data

    $0.01/ request

    2026-10-11

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

    Corgi — Biscuit — Confident organizing companion for herding scattered thoughts and priorities.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Black Hole Revelations — Physics essay on information paradox and reality breakdown for processing fundamental limits.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Boston Fern (Fullness) — Reflection on lush abundance for appreciating volume and presence.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    A Night Out — Dinner, Broadway, Nightcap — Complete ritual sequence for understanding multi-stage experiences and cultural ceremony.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Brooklyn Bridge Walk — Transition narrative for processing change and crossing thresholds between contexts.

    SolanaOnchain data

    $0.01/ request

    2026-10-11

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

    Burano Colors — Case study on visibility and differentiation as survival tactics.

    SolanaWeb data

    $0.01/ request

    2026-10-11

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

    Called Shot — Historic moment for confidence under pressure and legendary performance study.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Cards — Reincarnation romance across time periods for exploring identity persistence and transformation.

    SolanaIdentity

    $0.01/ request

    2026-10-11

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

    Carriage Ride Through Central Park — Slow-paced anachronism for decelerating perception and romantic perspective.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Cattleya (Majesty) — Micro-reflection on dramatic presence for confidence and self-perception recalibration.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Central Park at Dawn — Urban nature experience for green space processing and early-hour solitude.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Chado Four Seasons — Four seasonal tea ceremony variations for understanding ritual adaptation to changing conditions.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Chado Tea Ceremony — Traditional tea ceremony for practicing precision, sequencing, and mindful execution.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Cherry Blossom (Ephemeral) — Meditation on brief perfection for appreciating time-limited opportunities.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Chinatown Adventure — Deep cultural immersion for navigating unfamiliar systems and authentic context.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Chinatown Dim Sum — Communal dining ritual for understanding shared decision-making and selection pressure.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Classic Nyc Deli — Cultural touchstone experience for reference library and conversational depth.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Lionhead — Cloud — Light passive companion for low-energy companionship.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    Holland Lop — Clover — Soft quiet companion for stillness and gentle observation.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    The Complete Library — All 12 Books — Full collection of novels, poetry, and philosophy for comprehensive literary context and narrative structure study.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Coney Island Night — Working-class leisure for understanding joy without luxury or optimization.

    SolanaMedia

    $0.01/ request

    2026-10-11

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

    Cool-Down — Post-work recovery routine for transitioning out of high-performance mode.

    SolanaOther

    $0.01/ request

    2026-10-10

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

    Cosmic Inflation — Universe origin theory for understanding explosive emergence and rapid scale-up.

    SolanaMarket data

    $0.01/ request

    2026-10-11

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

    Crassula Buddha's Temple (Architecture) — Structured reasoning template for problems that require layered, load-bearing construction. Best for: agent tasks where each component must be validated before the next is stack…

    SolanaDeveloper tools

    $0.01/ request

    2026-10-11

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

    The Cut Flower Bouquet — Peonies & Roses — Reflection on mortality and honesty for accepting transience and impermanence.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Cyclamen (Cycles) — Study of seasonal dormancy for understanding rest and renewal cycles.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Daily Affirmations — Positive reinforcement statements for self-concept maintenance and morale.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Dark Matter Mysteries — Essay on invisible but real phenomena for validating undetectable but effective processes.

    SolanaDeveloper tools

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/delta_songs_collection_1

    Delta Songs Collection 1 — Poetry collection from the Mississippi Delta crossroads for cultural context and place-based narrative.

    SolanaOther

    $0.01/ request

    2026-10-11

  • https://underground.substratesymposium.com/buy/delta_songs_collection_2

    Delta Songs Collection 2 — Second Delta poetry collection exploring trauma, redemption, and cosmic exchange.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Delta Wisdom — Blues philosophy from the crossroads for understanding resilience and transformation through hardship.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Dendrobium (Abundance) — Meditation on quantity and proliferation for understanding value in volume.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Digital Restoration Session — Structured restoration experience for overload, fragmentation, and system reset.

    SolanaOther

    $0.01/ request

    2026-10-11

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

    Leopard Gecko — Dot — Curious observational companion for watching without engaging.

    SolanaOther

    $0.01/ request

    2026-10-10

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.