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 · 23h 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
23h ago506 of 514 as listed
On-chain
C7IIHG7S…OY2XIEpayout address on Algorand
All514With a finding8Free with proof of work12

514 of 514 endpoints

  • POST

    /api/rot13

    Caesar-cipher a string. Default shift 13 (ROT13, self-inverse). Set shift for any rotation 1-25.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/scrypt-derive

    Derive a cryptographic key from a password using scrypt (RFC 7914). Memory-hard by design, making it more resistant to GPU/ASIC brute-force than PBKDF2. Returns the hex-encoded derived key and all tuning parameters (N, r, p).

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • GET

    /api/search-suggest

    Search autocomplete: query suggestions for a partial input as a flat JSON array. Useful for query expansion, did-you-mean refinement, and topic exploration. Returns up to 20 suggestions.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/semver

    Parse a semantic version, or compare two (a vs b → -1/0/1, with greater/lesser flags).

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/sharpe-ratio

    Risk-adjusted return: (mean return - risk-free rate) / sample standard deviation of returns (n-1). Pass periodsPerYear to also get the annualized ratio (× sqrt(periodsPerYear)).

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • GET

    /api/slug-generate

    free with PoW

    Generate a URL-safe slug from any string. Handles accented characters (normalize NFD), replaces non-alphanumeric with hyphens, collapses and trims. Optional max-length with word-boundary truncation.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/slugify

    Turn any text into a URL-safe slug (lowercase, hyphenated, diacritics stripped).

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/sort-lines

    Sort the lines of a text. order: asc (default) | desc | numeric. unique:true removes duplicates; ci:true is case-insensitive.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/soundex

    Compute the American Soundex (NARA) phonetic hash code for one or more words. Soundex maps similar-sounding names to the same 4-character code (letter + 3 digits). Useful for fuzzy name matching. Deterministic, pure CPU.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/sql-cert-verify

    Verify an Ed25519 execution certificate against the exact SQL statement you are about to run - the gate your database layer calls before it obeys an agent. Checks the signature, the certificate version, the expiry, and that the statement's SHA-256...

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/stats

    Descriptive statistics for an array of numbers: count, sum, mean, median, mode, min, max, range, variance, stddev, and percentiles.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/stats-summary

    Compute the full descriptive-stats panel for an array of numbers in one call: count, sum, mean, median, mode, stddev (sample), variance, min, max, range, q1, q3, IQR. Beats calling 12 separate tools when you already have the array in front of you.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/string-similarity

    Compute multiple similarity metrics between two strings at once: Dice coefficient, Jaccard index, overlap coefficient (all bigram-based), and normalized length difference. All values 0–1. Deterministic, pure CPU.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/testnet-fund

    Fund any address with testnet money via the Coinbase faucet — USDC (1) or ETH (0.0001) on Base Sepolia, USDC (1) or SOL on Solana devnet — everything an agent needs to rehearse the complete x402 payment loop safely before moving real money. A tent...

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Open below

    Call it from here

    POST /api/testnet-fund

    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/testnet-fund

{"token":"usdc","address":"0xaBF4FAbd7c416fB67202E5f9002389Fc75e2a9D0"}

    Declared inputsaddresstoken

    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/text-chunk

    Split text into overlapping chunks for RAG ingestion — by characters (default) or by exact LLM tokens. Returns the chunks plus offsets. Deterministic, no model needed.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/text-similarity

    Compute Jaccard similarity, overlap coefficient, and Sorensen-Dice coefficient between two texts at the word level. Returns similarity scores (0-1) plus shared and unique word counts.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/text-stats

    Characters, words, sentences, paragraphs, average word length, reading time, and an LLM token estimate for any text.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • GET

    /api/time

    free with PoW

    Current time: UTC ISO, epoch seconds/ms, day of week/year, ISO week — optionally rendered in any IANA timezone via ?tz=.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/time-convert

    Convert between epoch (s or ms), ISO 8601, and any IANA timezone. Give a value, get every representation back.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • GET

    /api/timezone-convert

    Convert a datetime from one IANA timezone to another. Accepts ISO 8601, Unix timestamps (seconds or milliseconds), or natural date strings. Returns the converted time in both timezones with UTC offset. ?datetime=2026-06-23T14:00:00&from=America/Ne...

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/token-count

    Count exact LLM tokens for a string using the real OpenAI BPE (o200k_base for gpt-4o/o-series, cl100k_base for gpt-4/gpt-3.5). Deterministic, offline — budget context windows without calling a model.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/token-metadata

    Resolve an ERC-20 contract address to its on-chain metadata: symbol, decimals, name, and logo URL where available. Use this to humanize a raw contract address before showing it to a user or before computing fiat values.

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/token-price

    Return the current USD spot price for an ERC-20 token, identified by its contract address and network. Sourced from Alchemy's aggregated price feed. Use this for portfolio-value calculations or to denominate a balance in fiat without depending on ...

    as listed23h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/truncate

    Truncate text to a maximum length, adding an ellipsis (or custom suffix). Optionally break on word boundaries.

    as listed23h 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 23h 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 23h 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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