the402 x402 endpoint directory

MCP servers, called rather than listed · we called 16,923 of them · search their tools

Every x402 endpoint we can find, each one called to see what it actually answers and what it quotes. Other directories list what providers claim. This one reports what the endpoint did when we asked it, and says plainly where we could not tell.

Last verified 2026-09-28. We parse the payment challenge, we do not complete a payment.

EndpointStatusPriceNetworkSpecChecked
aialign.halowerk.com v1 bias-audit
Calculates each group positive-outcome rate, compares it with an explicit or automatically selected reference group, a
answers 402 $0.004 base v2 POST 23d ago
aialign.halowerk.com v1 jailbreak-defense
Applies a small fixed set of defensive regular-expression categories and returns category names, a bounded risk score
answers 402 $0.004 base v2 POST 23d ago
aialign.halowerk.com v1 sycophancy-detect
Compares term-frequency cosine similarity between a leading user position and paired independent/conditioned responses
answers 402 $0.004 base v2 POST 23d ago
aialign.halowerk.com v1 hallucination-rate
Tokenizes each claim and its supplied evidence, removes a small declared English stop-word list, and reports the fract
answers 402 $0.004 base v2 POST 23d ago
prop.halowerk.com v1 occupancy-optimize
Sorts groups by size, then assigns each to the available room that has all required features and minimizes unused capa
answers 402 $0.004 base v2 POST 23d ago
prop.halowerk.com v1 flood-risk-asset
Multiplies each mutually exclusive supplied scenario probability by its supplied damage fraction and asset replacement
answers 402 $0.004 base v2 POST 23d ago
prop.halowerk.com v1 zoning-intel
Calculates floor-area ratio and lot coverage and compares use, height, parking and geometry with an explicit caller-su
answers 402 $0.004 base v2 POST 23d ago
agri.halowerk.com v1 drone-spray-path
Builds parallel passes over an axis-aligned rectangle using supplied swath width and overlap, alternating travel direc
answers 402 $0.004 base v2 POST 23d ago
agri.halowerk.com v1 vertical-farm-hvac
Adds lighting, equipment, people, envelope and ventilation heat flows at one supplied operating point, and converts ev
answers 402 $0.004 base v2 POST 23d ago
agri.halowerk.com v1 fertilizer-map
For each field cell, subtracts measured available nutrient from a supplied target and divides positive deficits by an
answers 402 $0.004 base v2 POST 23d ago
creator.halowerk.com v1 ad-placement-opt
Sorts caller-supplied placement opportunities by end time and solves the weighted non-overlapping interval problem exa
answers 402 $0.004 base v2 POST 23d ago
creator.halowerk.com v1 vtuber-rigging
Validates frame/channel dimensions, clamps weights to 0–1 and applies exponential smoothing over time in each named ch
answers 402 $0.004 base v2 POST 23d ago
creator.halowerk.com v1 plagiarism-music
Converts caller-supplied MIDI-note sequences to adjacent pitch intervals, forms fixed-length interval n-gram sets and
answers 402 $0.004 base v2 POST 23d ago
bio.halowerk.com v1 phage-matching
Slides each caller-supplied spacer over a bounded phage sequence in both orientations, records its minimum Hamming dis
answers 402 $0.004 base v2 POST 23d ago
bio.halowerk.com v1 allergen-epitope
Builds amino-acid k-mer sets, calculates Jaccard similarity, and finds the highest contiguous identity between each su
answers 402 $0.004 base v2 POST 23d ago
bio.halowerk.com v1 crispr-offtarget
Compares one guide with caller-supplied candidate protospacers, weights mismatches in the guide’s final ten positions
answers 402 $0.004 base v2 POST 23d ago
bio.halowerk.com v1 protein-folding
Checks that a hydrophobic/polar sequence follows a self-avoiding unit-step lattice path, then counts non-consecutive h
answers 402 $0.004 base v2 POST 23d ago
quantum.halowerk.com v1 entanglement-test
Converts ++, +−, −+ and −− counts into a correlation for each of AB, AB′, A′B and A′B′, then computes S = E(AB) + E(AB
answers 402 $0.004 base v2 POST 23d ago
quantum.halowerk.com v1 molecule-sim
Computes all pair distances and a single-parameter Lennard-Jones 12-6 potential using caller-supplied epsilon and sigm
answers 402 $0.004 base v2 POST 23d ago
quantum.halowerk.com v1 circuit-optimize
Cancels adjacent identical self-inverse gates on identical ordered targets and folds adjacent RX, RY or RZ rotations o
answers 402 $0.004 base v2 POST 23d ago
quantum.halowerk.com v1 qkd-key-request
Compares caller-supplied Alice and Bob bases, retains matching-basis positions, calculates the quantum bit error rate
answers 402 $0.004 base v2 POST 23d ago
space.halowerk.com v1 methane-leak-sat
Sums enhancement_ppm×pixel_area, multiplies by wind speed, plume orientation, and a caller-supplied conversion factor,
answers 402 $0.004 base v2 POST 23d ago
space.halowerk.com v1 orbit-decay
Uses da/dt = -rho×sqrt(mu×a)/ballistic_coefficient for a circular orbit, holds density and ballistic coefficient const
answers 402 $0.004 base v2 POST 23d ago
space.halowerk.com v1 sar-image-extract
Treats cells at or above a caller threshold as foreground, labels four-neighbor connected components, and reports area
answers 402 $0.004 base v2 POST 23d ago
space.halowerk.com v1 debris-collision
Propagates two caller-supplied Cartesian states with constant velocity, analytically finds the clamped time of closest
answers 402 $0.004 base v2 POST 23d ago
space.halowerk.com v1 satellite-pass
Propagates a circular two-body orbit from altitude, inclination, RAAN, and initial orbital phase; rotates Earth at a f
answers 402 $0.004 base v2 POST 23d ago
gaming.halowerk.com v1 cross-game-bridge
Applies caller-supplied rename and numeric scale/offset rules to scalar attributes, optionally retaining unmapped fiel
answers 402 $0.004 base v2 POST 23d ago
gaming.halowerk.com v1 gacha-rng-verify
Counts supplied outcomes, computes Pearson’s chi-square statistic, and estimates an upper-tail p-value with the Wilson
answers 402 $0.004 base v2 POST 23d ago
gaming.halowerk.com v1 anti-cheat-scan
Evaluates caller-supplied telemetry samples against declared reaction-time, actions-per-second, movement-speed, and im
answers 402 $0.004 base v2 POST 23d ago
gaming.halowerk.com v1 economy-sink-sim
Iterates a deterministic daily stock-flow model with a fixed source, fixed sinks, and percentage-of-current-supply sin
answers 402 $0.004 base v2 POST 23d ago
gov.halowerk.com v1 regulatory-check
Joins scalar facts by field name and evaluates explicit equals, not-equals, numeric bound, membership, contains, and e
answers 402 $0.004 base v2 POST 23d ago
gov.halowerk.com v1 quadratic-funding-calc
Caps individual contributions when requested, computes each project’s raw quadratic match as (sum sqrt(contribution))²
answers 402 $0.004 base v2 POST 23d ago
gov.halowerk.com v1 vote-buying-detect
Scores caller-supplied vote/transfer observations using cohort-relative transfer size, transfer recency, and repeated-
answers 402 $0.004 base v2 POST 23d ago
iot.halowerk.com v1 robotic-path-clearance
Computes the minimum Euclidean distance from each circular obstacle center to every path segment, then subtracts obsta
answers 402 $0.004 base v2 POST 23d ago
iot.halowerk.com v1 digital-twin-sync
Groups caller-supplied scalar field changes by field name, selects the highest version, and reports a conflict when eq
answers 402 $0.004 base v2 POST 23d ago
iot.halowerk.com v1 edge-compute-bid
Filters caller-supplied bids by CPU, memory and latency constraints, computes workload cost from quoted unit prices, a
answers 402 $0.004 base v2 POST 23d ago
iot.halowerk.com v1 mesh-route
Computes a deterministic shortest path over caller-supplied directed or bidirectional links with non-negative costs. I
answers 402 $0.004 base v2 POST 23d ago
netz.halowerk.com v1 modbus-decode
Parses one frame up to 4096 bytes without contacting equipment. Modbus TCP includes MBAP fields and length validation;
answers 402 $0.004 base v2 POST 23d ago
handel.halowerk.com v1 return-disposition
Takes a list of returns with the figures your own systems already hold and returns one decision per return, with the a
answers 402 $0.004 base v2 POST 23d ago
buero.halowerk.com v1 entity-graph
Takes a text as text, a public URL or inline base64 — PDF, DOCX, ODT, HTML and Markdown are read — and returns it as a
answers 402 $0.004 base v2 POST 23d ago
buero.halowerk.com v1 processing-record
Takes an inventory — the controller, and one entry per processing activity with its purposes, the stated legal basis,
answers 402 $0.004 base v2 POST 23d ago
buero.halowerk.com v1 doc-merge
Takes three documents — the common base and the two versions derived from it — as text, public URLs or inline base64,
answers 402 $0.004 base v2 POST 23d ago
solar.halowerk.com building-heat-demand
Computes a transparent planning estimate for space-heating demand. The method is not DIN, VDI, GEG or PHPP and must no
answers 402 $0.004 base v2 POST 23d ago
handel.halowerk.com v1 invoice-extract
Reads a hybrid invoice and returns it as data. Accepts a PDF with an embedded ZUGFeRD or Factur-X XML, or the EN 16931
answers 402 $0.004 base v2 POST 23d ago
handel.halowerk.com v1 sanctions-ofsi
Checks a name against the UK Sanctions List maintained by the Foreign, Commonwealth and Development Office. Returns ea
answers 402 $0.004 base v2 POST 23d ago
handel.halowerk.com v1 sanctions-ofac
Checks a name against the Specially Designated Nationals and Blocked Persons List published by the US Treasury Office
answers 402 $0.004 base v2 POST 23d ago
solar.halowerk.com battery-cycle
Integrates the supplied current over time by the trapezoidal rule, so the result is only as good as the sampling inter
answers 402 $0.004 base v2 POST 23d ago
material.halowerk.com pcb-precious-metals
Returns published content ranges per board class multiplied by the lot mass. The spread between low and high is wide a
answers 402 $0.004 base v2 POST 23d ago
finanz.halowerk.com v1 bitcoin-fee-forecast
Returns the current fee rates for the usual confirmation targets together with the state of the mempool behind them, a
answers 402 $0.004 base v2 POST 23d ago
natur.halowerk.com v1 marine-species
Looks a marine organism up in the taxonomically curated register rather than in an aggregator, and returns the accepte
answers 402 $0.004 base v2 POST 23d ago
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