x402 resource directory

Find paid HTTP operations and MCP tools by URL, host, method or tool name. Compare payment terms across networks and catalogs.

Distinct HTTP URLs
164,839
Distinct MCP URLs
43
Catalog observations
263,972
URLs with a 402 in 7 days
2,279
Network identifiers
183

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POST https://bild.halowerk.com/v1/blur-detect · 2 observations
Converts the image to BT.601 luma at a fixed analysis size (long side analysis_max_side, default 1024; smaller images are not upscaled) and computes the variance of the 4-neighbour Laplacian (Pech-Pacheco et al. 2000) and the Tenengrad energy (mean squared Sobel magnitude). Because noise also raises the Laplacian variance, the Immerkær (1996) noise sigma is estimated and 20·sigma² (the Laplacian response to white noise) is subtracted.

bild.halowerk.com profile

  • Base · exact
    $0.0040 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0040 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/burst-best-pick · 2 observations
All frames are scaled to the same long side (the smallest long side, at most 768 px) so that measures are comparable. Sharpness is the mean noise-corrected Laplacian variance (variance − 20·σ², σ by Immerkær 1996) of the 4 sharpest of 4×4 tiles, so the subject counts more than a blurred background; it is scored relative to the sharpest frame.

bild.halowerk.com profile

  • Base · exact
    $0.0080 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0080 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/camera-fingerprint · 2 observations
Photo-response non-uniformity camera identification (Lukáš, Fridrich and Goljan 2006; maximum-likelihood fingerprint and peak-to-correlation energy after Goljan, Fridrich and Filler 2009). No datab...

bild.halowerk.com profile

  • Base · exact
    $0.0150 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0150 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/clone-detect · 2 observations
Copy-move detection by shift search and block verification (exact-shift idea after Fridrich, Soukal and Lukáš 2003): the image is converted to grey and scaled to at most max_side. The autocorrelation of the fine residual (image minus 3×3 mean, strong edges removed) is computed by FFT; sharp peaks at shifts of at least 0.75 × min_region_px are candidate copy vectors (ridges from straight edges are suppressed).

bild.halowerk.com profile

  • Base · exact
    $0.0100 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0100 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/color-cast · 2 observations
Converts opaque pixels of a copy with at most 512 px on the long side to CIELAB (D65, IEC 61966-2-1). Near-neutral reference: mean shift in the a*b* plane starting at (0, 0) with neutral_radius (default 12; the first step uses radius 25 only when fewer than 1 % of the pixels lie within it), centre kept within C* 25, over pixels with L* 20–95; at least 1 % of the pixels must belong to it.

bild.halowerk.com profile

  • Base · exact
    $0.0040 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0040 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/document-tamper-hints · 2 observations
Tesseract 5.3.4 (eng+deu, automatic page segmentation) finds words and text lines. Per line a robust baseline (Theil–Sen over words without descenders) is fitted; words more than 15 % of the median word height (at least 1.5 px) off the line are reported. Heights of words with ascenders/capitals and of x-height-only words are compared within the line (outside 0.87–1.15 × the line median).

bild.halowerk.com profile

  • Base · exact
    $0.0120 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0120 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/edit-trace · 2 observations
Reads the file structure without trusting any single field: EXIF (IFD0, Exif IFD, IFD1 thumbnail), XMP (CreatorTool, xmpMM history and document IDs, Camera Raw settings, IPTC digital source type), IPTC IIM and Photoshop image resources, PNG text and time chunks, WebP chunks, JPEG markers (APP12 "Ducky" of Save for Web, comments, data after EOI) and C2PA/JUMBF manifests (presence and readable labels only, signatures are NOT verified).

bild.halowerk.com profile

  • Base · exact
    $0.0060 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0060 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/ela-analysis · 2 observations
Error level analysis (Krawetz 2007): the image is re-encoded once as JPEG at the chosen quality (libvips/libjpeg, Annex K tables) and the per-pixel error level is the largest absolute channel difference to the input. Error levels are averaged per grid cell.

bild.halowerk.com profile

  • Base · exact
    $0.0060 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0060 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/email-html-compat · 2 observations
Parses the HTML (htmlparser2) and its CSS (postcss for <style> blocks, own parser for style attributes, css-what for selectors) and maps what it finds to 304 of the 306 detectable caniemail features: elements and attributes, input and button types, mailto and anchor links, comments and doctype, CSS properties and selected values (display:flex/grid/none, flex-direction:column, system-ui fonts), at-rules and media features (prefers-color-scheme and others), selector types and combinators…

bild.halowerk.com profile

  • Base · exact
    $0.0040 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0040 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/exposure-check · 2 observations
Analyses all opaque pixels (alpha ≥ 128) of a copy with at most 1024 px on the long side. The histogram uses 8-bit BT.709 luma of the encoded values. A pixel counts as clipped in the highlights when a channel reaches highlight_level (default 250; all channels = blown to white) and as crushed when every channel is at or below shadow_level (default 5).

bild.halowerk.com profile

  • Base · exact
    $0.0030 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0030 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/horizon-level · 2 observations
Finds strong edges (Sobel magnitude above the 90th percentile and at least 16) whose orientation lies within max_angle of horizontal on a copy with at most 800 px on the long side, votes them into an orientation-constrained Hough accumulator (0.1° steps), takes the strongest line and refines it with a weighted total-least-squares fit of the supporting edge pixels. A horizon is accepted when the supporting pixels span at least a quarter of the width.

bild.halowerk.com profile

  • Base · exact
    $0.0040 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0040 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/i18n-overflow · 2 observations
Lays out every string with fontkit (advance widths and GPOS/kern kerning) in Liberation Sans Regular or Bold (OFL, metric-compatible with Arial) or your own font, adds letter spacing per character, wraps at spaces like CSS white-space: normal with overflow-wrap: normal (a word wider than the container overflows) and compares with max_width and max_lines.

bild.halowerk.com profile

  • Base · exact
    $0.0030 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0030 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/jpeg-artifacts · 2 observations
Blockiness: mean absolute luma difference across columns/rows at each of the 8 grid offsets divided by the mean elsewhere (1.0 = no blocking); analysed at native resolution on a central crop of at most 2048×2048 aligned to the 8-pixel grid, in stored orientation. A maximum at an offset other than (0,0) points to an earlier compression before a crop or shift (blocking-artifact grid, Li/Yuan/Yu 2009).

bild.halowerk.com profile

  • Base · exact
    $0.0050 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0050 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/jpeg-ghost · 2 observations
JPEG ghosts (Farid 2009): the image is recompressed at each quality of a sweep, the squared luminance difference is averaged per block, and each block curve is normalised to 0–1 across qualities. A region that was compressed earlier at a lower quality q0 than the rest shows a dip ("ghost") at q0; regions whose normalised difference at some quality below the last save quality lies at least 0.3 under the image median are grouped into connected regions (reported with at least 6 blocks and a mean…

bild.halowerk.com profile

  • Base · exact
    $0.0100 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0100 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/license-notice-find · 2 observations
Reads EXIF 2.32 (Copyright with photographer/editor parts, Artist, XPAuthor), IPTC IIM 4.2 (CopyrightNotice, By-line, Credit, Source, SpecialInstructions), XMP (dc:rights, dc:creator, xmpRights:Marked/WebStatement/UsageTerms/Owner, photoshop:Credit/Source, cc:license, cc:attributionName/URL, PLUS licensor, copyright owner and status) and PNG text keys (Copyright, Author, Source, Disclaimer).

bild.halowerk.com profile

  • Base · exact
    $0.0060 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0060 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/noise-estimate · 2 observations
Uses the fast noise variance estimator of Immerkær (1996): the image is convolved with the 3×3 mask [1 −2 1; −2 4 −2; 1 −2 1], which cancels linear structure, and sigma = sqrt(π/2) · Σ|response| / (6·(W−2)(H−2)). Computed for BT.601 luma, the R, G and B channels and the JPEG Cb/Cr chroma planes. Because edges inflate the estimate, a second luma value excludes the 10 % of pixels with the strongest Sobel gradient (Tai & Yang 2008), and a tile median over up to 8×8 tiles is given.

bild.halowerk.com profile

  • Base · exact
    $0.0040 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0040 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/nr-quality-score · 2 observations
Implements NIQE (Mittal, Soundararajan, Bovik, IEEE Signal Processing Letters 2013) following the LIVE reference code: grey image (rgb2gray weights, 8-bit), MSCN coefficients with a 7×7 Gaussian window (σ = 7/6), 96×96 patches at two scales (second scale by bicubic anti-aliased halving), 18 asymmetric generalised Gaussian features per patch and scale, a multivariate Gaussian fit and the Mahalanobis-type distance to the pristine model of the LIVE NIQE Software Release (© 2011 The University of…

bild.halowerk.com profile

  • Base · exact
    $0.0060 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0060 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/print-readiness · 2 observations
Reads the image header (dimensions after EXIF orientation, colour space, ICC profile description, bit depth, stored density, alpha and actual transparency) and relates it to the print size plus bleed on each side. Paper sizes: ISO 216 A0–A7, B4, B5; ANSI letter, legal, tabloid; ISO/IEC 7810 ID-1 card; photo 4×6, 5×7, 8×10, 11×14 inch; or width_mm/height_mm. The paper is turned to match the image orientation.

bild.halowerk.com profile

  • Base · exact
    $0.0030 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 6 calls and 5 unique payers in 30 days. Last call .
  • Base · exact
    $0.0030 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/screenshot-authenticity · 2 observations
Screen captures are rendered pixels: large exactly flat areas, almost no sensor noise (noise level from the Immerkær 1996 mask, estimated robustly via the median absolute response, below 0.6; camera photos show at least 1 and under 5 % flat pixels) and lossless storage (PNG by default on iOS, Android, macOS and Windows).

bild.halowerk.com profile

  • Base · exact
    $0.0080 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0080 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/smart-crop · 2 observations
Computes frequency-tuned saliency (Achanta et al., CVPR 2009): distance in CIELAB (D65) between each pixel of a 5×5 binomially smoothed copy and the image mean colour, on a copy with at most 400 px on the long side. For each ratio the largest crop of that ratio (full height or full width) is slid along the free axis; the position keeping the most saliency wins, ties go to the position nearest the saliency centroid. Protected regions (subject boxes you know, e.g.

bild.halowerk.com profile

  • Base · exact
    $0.0060 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0060 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/stock-photo-signals · 2 observations
Combines four independent sources. (1) The optional file name is matched against download names of 11 agencies (Shutterstock "shutterstock_<id>", iStock "iStock-<id>"/"istockphoto-<id>-", Getty "GettyImages-<id>", Adobe Stock "AdobeStock_<id>", Depositphotos, Dreamstime, Bigstock, Pexels, Unsplash, Pixabay "<words>-<id>_1920"; patterns as observed 2026-11).

bild.halowerk.com profile

  • Base · exact
    $0.0080 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0080 (USDC)
    agentic.market · seen
POST https://bild.halowerk.com/v1/visible-watermark-find · 2 observations
Two OCR passes with Tesseract 5.3.4 (eng+deu, sparse text) run on a background-flattened greyscale copy (grey minus a 15-px Gaussian blur, gain 2) and on its inverse, so faint dark and light semi-transparent text over changing image content becomes readable. Words are classified as copyright sign, copyright word, stock agency name (fixed list of 27 agencies, 2026-11), watermark word (sample, preview, proof, Muster, Vorschau …), URL/domain or social handle.

bild.halowerk.com profile

  • Base · exact
    $0.0080 (USDC)
    Recipient 0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
    Coinbase CDP · seen
    Coinbase CDP reports 1 calls and 1 unique payers in 30 days. Last call .
  • Base · exact
    $0.0080 (USDC)
    agentic.market · seen

Counts describe directory coverage, including testnets. Each resource groups the same URL, HTTP method or MCP tool across sources. A catalog sighting records published terms. A live 402 records the endpoint’s reply to an unpaid request.