Assay

agent402.tools

Utilities514 endpointsagent402.tools

Cryptographic hash of a text string. Algorithms: sha256 (default), sha512, sha1, md5. Returns hex and base64 digests.

Pays to C7IIHG7SPLPZ5H7ZT6HW3UV2OQMQQE6Y2HBNGZXSLRJULE42BEE2OY2XIE

Pays elsewhere2 rerouted · 21h ago2 above list8 of 514 failing
$0.001 – $1.50
USDC
Score
None yetno buyer reviews yet
Positive
None yetno buyer reviews yet
Paid calls
2,0894 distinct payers
Verified
21h ago506 of 514 as listed
On-chain
C7IIHG7S…OY2XIEpayout address on Algorand
All514With a finding8Free with proof of work12

514 of 514 endpoints

  • GET

    /api/chain-info

    One-call chain state snapshot: chain id, latest block number, and current gas price (wei + gwei) for Ethereum, Base, Polygon, Arbitrum, or Optimism. Keyless multi-endpoint failover. ?network=base

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/char-frequency

    Analyze the character frequency distribution of a string. Returns counts by category (letters, digits, spaces, punctuation, other) and the top-N most frequent characters with counts and percentages. Deterministic, pure CPU.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/checksum

    Compute MD5, SHA-1, SHA-256, SHA-512, and CRC32 checksums of a string in a single call. Useful for verifying file or payload integrity across different checksum standards without needing five separate tools.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/color

    Convert a color between hex, RGB, and HSL. Accepts "#1a2b3c", "rgb(26,43,60)", or "hsl(210,40%,17%)".

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
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  • POST

    /api/color-blindness

    Simulate how a color appears to viewers with protanopia (red-blind), deuteranopia (green-blind), or tritanopia (blue-blind) — the three dichromacy types covering ~8% of men and ~0.5% of women. Returns the simulated RGB plus the contrast ratio agai...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
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  • POST

    /api/color-contrast

    Compute the WCAG 2.x contrast ratio between two colors (hex #rgb or #rrggbb) and whether it passes AA/AAA for normal and large text. Deterministic — for accessible color choices without a tool in the loop.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Open below

    Call it from here

    POST /api/color-contrast

    Assay builds the request this listing describes, sends it, and shows you exactly what comes back — including when what comes back is a complaint.

    The request, built from the listing

    POST https://agent402.tools/api/color-contrast

{"background":"#ffffff","foreground":"#777777"}

    Declared inputsbackgroundforeground

    Listed at $0.001. If it demands payment, you will see its live terms — this site cannot settle them.

    This page holds no key and cannot move money. Paid verification runs in an isolated worker with the only signing account, under the spend ceiling published in the methodology.

  • POST

    /api/color-convert

    Convert a color between every common notation (hex, rgb, hsl, oklch) at once, plus return the nearest CSS named color. Accepts input as hex (#fff or #ffffff), rgb()/rgba(), hsl()/hsla(), oklch(), or any of the 148 CSS named colors. Use this when a...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/color-name

    Two-way CSS named color tool. Pass a name (e.g. "rebeccapurple") to get its canonical RGB/hex; pass a hex/rgb color to get the closest CSS named color and the distance (RGB Euclidean, 0 = exact match). Useful when an agent needs to convert designe...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/color-palette

    Generate a coordinated palette from a base color using a named color-theory scheme: complementary (2 colors), analogous (3), triadic (3), tetradic (4), split-complementary (3), or monochromatic (5 lightness variants). Returns each color in hex, rg...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
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  • POST

    /api/combinatorics

    Compute combinations C(n, r) or permutations P(n, r) using BigInt for exact arbitrary-precision results. Returns the result as a string (since values can exceed Number.MAX_SAFE_INTEGER) and a human-readable formula.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/compress-compare

    Run the same input through gzip, brotli, and raw deflate at max settings and report each one's output size and ratio. Use this to decide which algorithm to actually use — the answer depends on your content (binary often resists compression entirel...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/constant-compare

    Compare two strings in constant time using node:crypto timingSafeEqual, preventing timing side-channel attacks. Returns whether the strings are equal and whether their lengths match. Different-length strings are always unequal but comparison does ...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
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  • POST

    /api/correlation

    Pearson correlation coefficient between two equal-length numeric series. Returns r (the correlation, -1 to 1), r² (variance explained), n (sample size). Use this to ask things like: is a stock's daily return correlated with a macro indicator? Are ...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/count

    Count characters, words, lines, and (optionally) occurrences of a substring in text.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/crc32

    CRC-32 checksum of a text string (hex), the IEEE polynomial used by zip/png/gzip.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • GET

    /api/cron-explain

    free with PoW

    Parse a standard 5-field cron expression (minute hour day-of-month month day-of-week) and return a human-readable explanation. Supports wildcards (*), ranges (1-5), lists (1,3,5), steps (*/15), and named months/days (JAN, MON). ?expression=0+9+*+*...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/csv-lint

    Validate CSV structure: consistent column counts across rows, properly closed quotes, delimiter detection. Returns row/column counts and any structural errors. Pure CPU.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/date-diff

    Difference between two dates/times in ms, seconds, minutes, hours, days, and a human summary.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
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  • GET

    /api/date-format

    free with PoW

    Parse a datetime from any format (ISO 8601, Unix timestamp in seconds or milliseconds, RFC 2822, or natural date string) and return it in every common format: ISO 8601, Unix (seconds), Unix (ms), RFC 2822, date-only, time-only, day of week, and hu...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/day-of-year

    Get the day number within the year (1-366) for any date, plus days remaining, leap-year status, percent of year complete, and a simple (Sunday-start) week number.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/dedupe-lines

    Remove duplicate lines, preserving first-seen order. Returns the deduped text and how many were removed.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
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  • POST

    /api/defi-tvl

    Look up the current Total Value Locked (TVL) for a DeFi protocol via DeFiLlama's public API. Identify the protocol by its DeFiLlama slug (uniswap, aave, lido, ethena, etc.). Returns the total TVL plus per-chain breakdown and 24h/7d/30d change wher...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/dex-pair

    Look up the Uniswap V3 pool address for a token pair + fee tier on Ethereum, Base, Polygon, Arbitrum, or Optimism. Pass either order (tokenA/tokenB) — the factory sorts internally. Returns 0x0…0 if no pool has been deployed for that combination yet.

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/dex-top-pools

    Top DEX pools (Uniswap, Sushi, Curve, Aerodrome, etc.) ranked by current TVL — filterable by chain and project. Sourced from DeFiLlama's public Yields API (keyless). Each row carries chain, project slug, symbol pair, TVL in USD, current APY, and p...

    as listed21h agoagent402.tools

    $0.001
    per call, USDC
    Try it

Buyer reviews

none yet · a review costs a settlement

Nobody has bought from agent402.tools through an address that came back to write about it. Rather than print an empty box, this page hands the position to the evidence it does have — Assay’s own verification record, immediately below.

  1. 01

    Pay the merchant

    Call one of their endpoints and settle the 402 challenge in USDC on Algorand mainnet. That transfer is the whole credential.

  2. 02

    Sign the settlement

    Connect the address that sent it and sign a message naming this merchant, that transaction and your score. Assay stores no account and no password.

  3. 03

    The receipt travels with it

    Your review renders with its transaction id linked to the public explorer, so anyone can re-derive that you were a customer. One settlement buys one review.

Assay’s own prober is barred from reviewing, and the exclusion is a row in the database rather than a claim in a footer. Own this payout address? Claim the listing

Verification record

last sweep 21h ago · 514 of 514 covered

Nobody has reviewed agent402.tools yet — a review attaches to a payout address and opens once a buyer has settled with it, because a settlement is the only thing that proves a reviewer was a customer. Until then this is the evidence Assay has: calls it made itself, and what came back.

What the last sweep found

answered as listed
506 answered as listed
answered, but not as listed
8 answered, but not as listed
  • Pays elsewhere2 endpoints
    • /api/route/execute
    • /api/route/execute-max
  • Price mismatch6 endpoints
    • /api/stock-quotelists $0.01, demands $0.003
    • /api/skill/domain-intellists $0.25, demands $0.075
    • /api/answerlists $0.03, demands $0.08
    • and 3 more

List every endpoint with a finding · checked 21h ago

Settled payments

Delivered for free, on proof of work

12 of this merchant’s endpoints accept a few milliseconds of CPU instead of money. Assay solved the puzzle and got real content back, which turns “it challenged for payment” into “it actually delivers” at no cost — and you can reproduce it from the endpoint list.

List the 12 you can call for nothing

Also in utilities

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