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 2026-10-11. We parse the payment challenge, we do not complete a payment.

EndpointStatusPriceNetworkSpecChecked
zoll.halowerk.com v1 origin-rules
Checks supplied preference-origin criteria and reports the applied threshold. Missing facts are returned as null and n
answers 402 $0.003 base v2 POST 35d ago
geo.halowerk.com v1 crs-transform
Transforms coordinates between EPSG:4326 and EPSG:3857 with declared formulas. Missing facts are returned as null and
answers 402 $0.003 base v2 POST 35d ago
klima.halowerk.com v1 emission-factor
Selects a published emissions factor by activity, region and source edition. Missing facts are returned as null and na
answers 402 $0.003 base v2 POST 35d ago
dep.halowerk.com v1 package-meta
Retrieves current package metadata from npm, PyPI, crates.io or Maven Central. Missing facts are returned as null and
answers 402 $0.003 base v2 POST 35d ago
fracht.halowerk.com v1 locode-resolve
Resolves a UN/LOCODE against a supplied official code-list record. Missing facts are returned as null and named in una
answers 402 $0.003 base v2 POST 35d ago
zoll.halowerk.com v1 duty-rate
Evaluates a published TARIC duty measure for a commodity code and origin. Missing facts are returned as null and named
answers 402 $0.003 base v2 POST 35d ago
password-strength.api.klymax402.com api check
Check password strength with entropy and crack time
answers 402 $0.003 base v2 POST 35d ago
json-validator.api.klymax402.com api validate
Validate JSON and optionally check against a JSON Schema
answers 402 $0.003 base v2 POST 35d ago
aialign.halowerk.com v1 confidence-calib
Compares scalar confidence with binary correctness, calculates mean squared Brier loss, partitions confidence into cal
answers 402 $0.003 base v2 POST 35d ago
aialign.halowerk.com v1 memory-sanitize
Replaces private-key blocks, credential assignments, email addresses, Luhn-valid payment-card candidates, IPv4 address
answers 402 $0.003 base v2 POST 35d ago
aialign.halowerk.com v1 capability-eval
Computes weighted pass rates and weighted scores from caller-labeled test outcomes, with deterministic category summar
answers 402 $0.003 base v2 POST 35d ago
aialign.halowerk.com v1 resource-hog
Divides observed CPU, memory-time, network, tool-call and wall-time usage by caller-supplied budgets, reports exceeded
answers 402 $0.003 base v2 POST 35d ago
aialign.halowerk.com v1 goal-drift
Aligns caller-labeled dimensions, computes cosine similarity and a normalized L1 difference, and flags drift against a
answers 402 $0.003 base v2 POST 35d ago
prop.halowerk.com v1 materials-lca
Multiplies installed quantities by supplied waste-adjusted production factors and adds tonne-kilometre transport facto
answers 402 $0.003 base v2 POST 35d ago
prop.halowerk.com v1 gentrification-index
Standardizes current-minus-baseline change by a supplied scale, applies an explicit direction and weight, clips extrem
answers 402 $0.003 base v2 POST 35d ago
prop.halowerk.com v1 foot-traffic-retail
Compares supplied visits, mean dwell time and conversions with explicit baselines and combines the three ratios using
answers 402 $0.003 base v2 POST 35d ago
prop.halowerk.com v1 hvac-fault-detect
Applies caller-selected thresholds to supply/return temperature differences, commanded operation, fan state and electr
answers 402 $0.003 base v2 POST 35d ago
prop.halowerk.com v1 yield-forecast
Compounds supplied rent and expense growth assumptions, applies vacancy and collection loss, subtracts operating expen
answers 402 $0.003 base v2 POST 35d ago
agri.halowerk.com v1 supply-spoilage
Converts each supplied storage segment into equivalent ageing at a reference temperature using a caller-supplied Q10 f
answers 402 $0.003 base v2 POST 35d ago
agri.halowerk.com v1 carbon-capture
Converts area, sampling depth, bulk density and initial/final organic-carbon mass fractions into stock estimates and a
answers 402 $0.003 base v2 POST 35d ago
agri.halowerk.com v1 harvest-window
Adds simple degree-days from caller-supplied daily temperatures to an existing accumulation, then marks days that meet
answers 402 $0.003 base v2 POST 35d ago
agri.halowerk.com v1 livestock-health
Compares temperature, heart rate and an activity ratio with ranges supplied by the caller, then reports normalized dev
answers 402 $0.003 base v2 POST 35d ago
agri.halowerk.com v1 pest-outbreak
Accumulates simple daily degree-days above a supplied base temperature and combines threshold progress with mean humid
answers 402 $0.003 base v2 POST 35d ago
agri.halowerk.com v1 soil-moisture
Runs a deterministic bucket balance for each supplied day. Rain is reduced by a caller-selected runoff fraction, evapo
answers 402 $0.003 base v2 POST 35d ago
creator.halowerk.com v1 voice-clone-check
Calculates cosine similarity between caller-supplied numeric embeddings and combines it with supplied spectral distanc
answers 402 $0.003 base v2 POST 35d ago
creator.halowerk.com v1 thumbnail-ctr
Updates one shared beta prior with each variant’s supplied clicks and non-clicks, reports posterior means and bounded
answers 402 $0.003 base v2 POST 35d ago
creator.halowerk.com v1 fan-engagement
Weights likes, comments, shares, saves and clicks, divides by supplied reach, and reports cohort and aggregate points
answers 402 $0.003 base v2 POST 35d ago
creator.halowerk.com v1 trend-hijack
Tokenizes caller-supplied campaign and trend keywords, calculates overlap relative to the trend vocabulary, and flags
answers 402 $0.003 base v2 POST 35d ago
creator.halowerk.com v1 watermark-embed
Normalizes whitespace, inserts a caller-supplied visible marker after every selected number of words and at the end of
answers 402 $0.003 base v2 POST 35d ago
creator.halowerk.com v1 deepfake-score
Normalizes caller-supplied blink deviation, lip-sync error, spectral discontinuity, compression inconsistency and meta
answers 402 $0.003 base v2 POST 35d ago
bio.halowerk.com v1 tissue-scaffold
Uses the Kozeny-Carman relation with supplied porosity and pore diameter, then applies Darcy’s law with supplied thick
answers 402 $0.003 base v2 POST 35d ago
bio.halowerk.com v1 syn-yeast-yield
Divides each available substrate mass by its required mass per product mass, selects the limiting substrate, and appli
answers 402 $0.003 base v2 POST 35d ago
bio.halowerk.com v1 biomarker-longevity
Standardizes each supplied value against its supplied mean and standard deviation, flips markers whose favorable direc
answers 402 $0.003 base v2 POST 35d ago
bio.halowerk.com v1 pathogen-r0
Multiplies per-contact transmission probability, effective contacts per day and infectious duration to obtain a simple
answers 402 $0.003 base v2 POST 35d ago
bio.halowerk.com v1 microbiome-diversity
Normalizes non-negative caller-supplied taxon counts and computes observed richness, natural-log Shannon entropy, Simp
answers 402 $0.003 base v2 POST 35d ago
bio.halowerk.com v1 dna-storage-encode
Maps each two-bit group of caller-supplied UTF-8 bytes to A, C, G or T and reports a SHA-256 checksum of the original
answers 402 $0.003 base v2 POST 35d ago
quantum.halowerk.com v1 lattice-check
Uses lattice dimension, log2 determinant and an assumed root-Hermite factor to estimate Gaussian-heuristic and reduced
answers 402 $0.003 base v2 POST 35d ago
quantum.halowerk.com v1 error-correction
Treats a caller-supplied odd-length bit word as a classical repetition code, majority-decodes one logical bit, and rep
answers 402 $0.003 base v2 POST 35d ago
quantum.halowerk.com v1 shors-threat-index
Estimates logical qubits and logical gates from algorithm family and key size, applies a caller-supplied error-correct
answers 402 $0.003 base v2 POST 35d ago
space.halowerk.com v1 night-lights-econ
Fits ordinary least squares to log radiance by year, converts the slope to annual radiance change, and applies a calle
answers 402 $0.003 base v2 POST 35d ago
space.halowerk.com v1 crop-yield-ndvi
Computes mean NDVI and an ordinary least-squares daily NDVI trend, then applies yield = intercept + mean_coefficient×m
answers 402 $0.003 base v2 POST 35d ago
space.halowerk.com v1 dark-fleet-detect
Combines caller-supplied AIS gap duration, unmatched satellite detections, night-observation fraction, and position di
answers 402 $0.003 base v2 POST 35d ago
space.halowerk.com v1 launch-weather
Checks wind, gust, lightning distance, precipitation, cloud fraction, and temperature against caller-supplied limits a
answers 402 $0.003 base v2 POST 35d ago
gaming.halowerk.com v1 player-churn-risk
Applies fixed coefficients to recency, session trend, playtime, support tickets, and recent purchases. It is an untrai
answers 402 $0.003 base v2 POST 35d ago
gaming.halowerk.com v1 quest-generation
Selects objective framing, complication, and reward language from declared templates using a caller seed. It returns a
answers 402 $0.003 base v2 POST 35d ago
gaming.halowerk.com v1 nft-metadata-mutate
Applies ordered set/remove attribute and set name/description operations to caller-supplied metadata, then hashes cano
answers 402 $0.003 base v2 POST 35d ago
gaming.halowerk.com v1 matchmaking-mmr
Enumerates feasible player pairs, ranks them by rating gap then worst latency, and greedily selects disjoint pairs. Th
answers 402 $0.003 base v2 POST 35d ago
gaming.halowerk.com v1 asset-procedural
Maps a seed and asset category to declared silhouette, material, palette, symmetry, and detail parameters. The result
answers 402 $0.003 base v2 POST 35d ago
gaming.halowerk.com v1 npc-dialogue-gen
Selects and fills a small declared dialogue template using a caller-supplied seed, NPC name, intent, tone, and facts.
answers 402 $0.003 base v2 POST 35d ago
gov.halowerk.com v1 voter-turnout-predict
Applies a fixed, published logistic equation to aggregate caller-supplied features and reports an estimated turnout ra
answers 402 $0.003 base v2 POST 35d ago
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