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 · 20h 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
20h 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/add-time

    Add (or subtract) a duration to a date. duration like "2d", "-3h", "1w 2d", "90m". Returns the resulting UTC ISO timestamp.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/age

    Compute a precise age (years, months, days) from a birth date to today (or a given date), plus total days.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/amortization

    Build the full per-period amortization schedule for a fully-amortizing loan. Each row reports the period number, payment, the principal vs. interest split for that payment, and the remaining balance after that payment. Use this when the user wants...

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/annuity

    Present and future value of a level annuity (equal periodic payments). Supports an ordinary annuity (payments at period end) and an annuity-due (payments at period start).

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/b20-feature-id

    Pure-CPU helper: turn a B20 feature string (e.g. base.b20_asset) into its bytes32 feature id and ready-to-send isActivated(bytes32) calldata for the Activation Registry. No network egress.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/base-convert

    Convert an integer between number bases (radix 2-36), e.g. binary↔hex↔decimal. Arbitrary size via BigInt.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/base-detect

    Auto-detect the encoding format of a string: base64, base32, hex, binary, decimal, or plain text. Returns confidence scores and decoded preview for each candidate. Pure CPU, deterministic.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/base32

    Base32 (RFC 4648) encode or decode text. mode: encode (default) or decode.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/base58

    Base58 encode or decode text (Bitcoin/IPFS alphabet). mode: encode (default) or decode.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/base64

    Base64 encode or decode text. mode: encode (default) or decode. Handles URL-safe base64 on decode.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/binary-text

    Convert text to its binary (base-2) representation (8-bit per character, space-separated) or decode binary back to text. Deterministic, pure CPU.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • GET

    /api/block-number

    The latest block number on Ethereum, Base, Polygon, Arbitrum, or Optimism. The cheapest possible on-chain read - the hello world of paid chain access. Keyless multi-endpoint failover. ?network=base

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/bond-price

    Price a fixed-coupon bond from its yield to maturity: present-value the coupons plus face. Returns clean price, coupon per period, current yield, and premium/discount vs par.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/braille-convert

    Convert text to Unicode Braille characters (Grade 1 / uncontracted) or decode Braille back to text. Supports letters, digits, and common punctuation. Deterministic, pure CPU.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/break-even

    Break-even point for a product: the units and revenue at which total revenue covers fixed plus variable costs. Also returns contribution margin and margin ratio.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/brotli-compress

    Compress a string with Brotli (RFC 7932) and return it as base64. Brotli typically beats gzip by 15-25% on text — useful when bytes matter (e.g. cramming context into an LLM prompt, fitting under a transport cap). Slower than gzip; pick gzip if sp...

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/brotli-decompress

    Decompress a base64-encoded Brotli payload. Returns the result as utf8 (text) or base64 (binary). Refuses to expand past 10MB to defend against zip bombs.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/business-days

    Count business days (Mon–Fri) between two dates, inclusive of the start, exclusive of the end. Optional list of holiday dates to skip.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Open below

    Call it from here

    POST /api/business-days

    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/business-days

{"to":"2026-06-08","from":"2026-06-01","holidays":[]}

    Declared inputsfromholidaysto

    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/cagr

    Compound annual growth rate between a beginning and ending value over N years: (end/begin)^(1/years) - 1. Also returns total growth over the whole period.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • GET

    /api/calendar-diff

    free with PoW

    Calculate the precise difference between two datetimes in years, months, days, hours, minutes, seconds, and total milliseconds. Accepts ISO 8601, Unix timestamps, or natural date strings. ?from=2024-01-15&to=2026-06-23.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/captcha-generate

    Mint a stateless captcha challenge to gate your OWN endpoint: returns a human prompt plus a salted sha256 answer hash you keep and verify later (sha256(salt + normalized answer) === answerHash) — no server state, no shared secret. Types: math (ari...

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/card-validate

    Validate a payment card number (Luhn checksum) and detect the brand. Numbers are not stored or logged.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/case

    Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, lower, UPPER.

    as listed20h agoagent402.tools

    $0.001
    per call, USDC
    Try it
  • POST

    /api/case-convert

    Convert text between naming conventions: camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and Title Case. Auto-detects the input format by splitting on camelCase boundaries, underscores, hyphens, and spaces. Deterministic, pure CPU.

    as listed20h 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 20h 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 20h 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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