chain.openverbs.com
Base · payout 0xb3f4de103f34b99f0da19b4f16d6b53a14c2194a
Answers HTTP 402
69 of 121 probed endpoints answered HTTP 402 with a parseable payment payload
checked 2026-10-05
Method: one unpaid request per listed endpoint. A 402 with a payment payload a client could parse counts. Nothing is paid.
x402-style payments, last 7 days (Base)
615 x402-style payments from 15 distinct payers, $9.75 USDC in the last 7 days (Base, exact read)
window ended 2026-10-05
- Payments
- 615
- Outside payers
- 15
- USDC
- 9.75
All USDC received at this payout address: $9.75 (includes payments that are not x402)
Method: counted when the transaction carries a signed USDC authorization (EIP-3009), the settlement x402's exact scheme uses. Some non-x402 gasless sends use it too.
Reading: x402-style payments to this payout address on Base, exact read of the 7 days to 2026-10-05, every block of the window: counted when the transaction carries a signed USDC authorization (EIP-3009), the settlement x402's `exact` scheme uses. Some non-x402 gasless sends use it too; Sato Hub's own payer wallets are left out
Delivery is not measured. We never send a payment, so we never observe what a paid call returns. Unknown means we hold no reading, not that anything failed.
Chains · one payout address, each chain read on its own
| Chain | Payout address | Listings | Answers 402 | x402-style payments |
|---|---|---|---|---|
| Base | 0xb3f4de103f34b99f0da19b4f16d6b53a14c2194a | 408 | 69 of 121 probed endpoints answered HTTP 402 with a parseable payment payload 2026-10-05 | 615 x402-style payments from 15 distinct payers, $9.75 USDC in the last 7 days (Base, exact read) |
- Hosts
- airport.openverbs.com, astro.openverbs.com, bitwise.openverbs.com, braille.openverbs.com, chain.openverbs.com, checkdigit.openverbs.com, checksum.openverbs.com, chem.openverbs.com, chemeq.openverbs.com, color.openverbs.com, combinatorics.openverbs.com, creditcard.openverbs.com, crypto.openverbs.com, data.openverbs.com, datetime.openverbs.com, dice.openverbs.com, dictionary.openverbs.com, distribution.openverbs.com, dns.openverbs.com, edgar.openverbs.com, email.openverbs.com, emailauth.openverbs.com, emoji.openverbs.com, encoding.openverbs.com, finance.openverbs.com, format.openverbs.com, fraction.openverbs.com, fx.openverbs.com, geocode.openverbs.com, geometry.openverbs.com, geospatial.openverbs.com, gleif.openverbs.com, hash.openverbs.com, holidays.openverbs.com, html.openverbs.com, iban.openverbs.com, ical.openverbs.com, id.openverbs.com, inflect.openverbs.com, ip.openverbs.com, iso.openverbs.com, jsonschema.openverbs.com, jwt.openverbs.com, macaddress.openverbs.com, markdown.openverbs.com, math.openverbs.com, matrix.openverbs.com, mcpscan.openverbs.com, mime.openverbs.com, money.openverbs.com, music.openverbs.com, nato.openverbs.com, numeral.openverbs.com, numtheory.openverbs.com, otp.openverbs.com, pack.openverbs.com, password.openverbs.com, pdf.openverbs.com, phone.openverbs.com, physics.openverbs.com, places.openverbs.com, postal.openverbs.com, preflight.openverbs.com, products.openverbs.com, qr.openverbs.com, random.openverbs.com, rdap.openverbs.com, readability.openverbs.com, regex.openverbs.com, scan.openverbs.com, search.openverbs.com, semver.openverbs.com, sentiment.openverbs.com, seo.openverbs.com, similarity.openverbs.com, slug.openverbs.com, spreadsheet.openverbs.com, stats.openverbs.com, text.openverbs.com, timecode.openverbs.com, tls.openverbs.com, tokens.openverbs.com, unicode.openverbs.com, unit.openverbs.com, url.openverbs.com, urltrust.openverbs.com, useragent.openverbs.com, vat.openverbs.com, wallet.openverbs.com, web.openverbs.com, wikidata.openverbs.com
- Listings
- 408 registered in the x402 catalogue
- Price range
- $0.0010 to $0.060 per call, as registered
- Categories (auto)
- Developer tools (141), Other (113), Onchain data (38), Web data (30), Identity (21), Media (17), Market data (14), Search (13), Commerce (12), Security (6), Inference (3)
- First seen
- 2026-10-05 · last seen 2026-10-05
Claim this merchant
Sign a message from the payout address 0xb3f4de…c2194a to claim this page or download its payment ledger. Claiming proves control of the payout key. It says nothing about the service behind the address, and it does not change how this merchant is ranked. No email, no account: the signature is the whole credential, and signing a message costs no gas and moves nothing.
Registrations · 408
| Endpoint | Chain | Category | Price | Catalogue date |
|---|---|---|---|---|
https://crypto.openverbs.com/v1/yields Top DeFi yield pools ranked by APY, with optional filters (chain, project, stablecoin-only, minimum TVL). Dust pools below `minTvlUsd` (default $10k) are excluded so reported APYs are meaningful. | Base | Onchain data | $0.003 | 2026-10-05 |
https://web.openverbs.com/v1/headers Fetch a URL (following redirects) and return the final response's HTTP headers, the server banner and content-type, plus a security-header audit reporting HSTS, Content-Security-Policy, X-Content-Type-Options, X-Frame-O… | Base | Web data | $0.003 | 2026-10-05 |
https://web.openverbs.com/v1/redirects Follow a URL's redirect chain (301/302/303/307/308) to its final destination and return every hop with its status and Location. Unwraps link shorteners and cloaked/tracking links so an agent can see where a link really … | Base | Web data | $0.003 | 2026-10-05 |
https://airport.openverbs.com/v1/nearest Find the airports nearest to a latitude/longitude, ordered by great-circle distance. Optionally cap the search radius (km), result count and airport type. Returns each airport with its distance in km. | Base | Commerce | $0.004 | 2026-10-02 |
https://astro.openverbs.com/v1/julian-date Compute the astronomical Julian Date (JD, fractional, epoch noon 1 Jan 4713 BC) and Modified Julian Date (MJD = JD − 2400000.5) of a UTC instant. Unlike `calendar`'s integer Julian Day Number, this carries the time-of-d… | Base | Other | $0.004 | 2026-10-02 |
https://astro.openverbs.com/v1/moon-phase Compute the Moon's phase name, age in days since the last new moon and illuminated fraction (0..1) for a UTC date/time. Uses the mean synodic month (29.53 days). | Base | Developer tools | $0.004 | 2026-10-02 |
https://astro.openverbs.com/v1/season Determine the astronomical season for a date, based on the Sun's apparent ecliptic longitude (0°=March equinox, 90°=June solstice, …). Defaults to the northern hemisphere; pass `hemisphere` to flip. | Base | Other | $0.004 | 2026-10-02 |
https://astro.openverbs.com/v1/sun Compute sunrise, sunset, solar noon and day length for a latitude/longitude (east-positive) and date, using the NOAA sunrise equation. All times are UTC ISO-8601. Locations in polar day or night return null rise/set wit… | Base | Other | $0.004 | 2026-10-02 |
https://chain.openverbs.com/v1/decode Turn a 4-byte function selector or full calldata into its human-readable function signature, and (when calldata is present) the decoded argument values. Supply an `abi` for a fully deterministic offline decode, or omit … | Base | Developer tools | $0.004 | 2026-09-27 |
https://chain.openverbs.com/v1/gas-estimate Simulate a transaction before signing: runs `eth_estimateGas` for `{ to, from?, data?, value? }` and returns the estimated gas units and estimated fee (current gas price x gas, in wei + ETH). If the node rejects the cal… | Base | Onchain data | $0.004 | 2026-09-27 |
https://chain.openverbs.com/v1/proxy Detect whether a contract is an upgradeable proxy and resolve its implementation: reads the standard EIP-1967 implementation/admin/beacon slots, EIP-1822 (UUPS), the OpenZeppelin legacy slot, and EIP-1167 minimal-proxy … | Base | Onchain data | $0.004 | 2026-09-27 |
https://chem.openverbs.com/v1/element Look up a periodic-table element by exactly one of `symbol` (e.g. "Fe"), `name` (e.g. "iron") or atomic `number` (1..118). Returns its number, symbol, name, standard atomic weight and whether that weight is a true stand… | Base | Other | $0.004 | 2026-09-06 |
https://chem.openverbs.com/v1/molar-mass Compute the molar mass (g/mol) of a chemical formula. Supports nested parentheses and brackets, element multipliers, and hydrate dot notation with coefficients (e.g. "Ca(OH)2", "CuSO4·5H2O", "K4[Fe(CN)6]"). Returns the … | Base | Developer tools | $0.004 | 2026-09-06 |
https://chem.openverbs.com/v1/search Search the periodic table by name or symbol substring. Exact matches rank first, then prefix matches, then substring matches. Returns up to `limit` elements (default 20) plus the total match count. | Base | Search | $0.004 | 2026-10-02 |
https://chemeq.openverbs.com/v1/balance Balance an equation such as "H2 + O2 -> H2O" into the smallest whole-number coefficients using exact rational linear algebra. Equations that cannot be balanced with positive coefficients are clean 400s. | Base | Onchain data | $0.004 | 2026-09-06 |
https://chemeq.openverbs.com/v1/limiting Given a reaction and the supplied amount of every reactant, identify the limiting reagent and compute leftover reactant and theoretical product yields. | Base | Developer tools | $0.004 | 2026-09-06 |
https://chemeq.openverbs.com/v1/stoichiometry Given a reaction and a known amount (moles or grams) of one species, compute the amount of a target species. The equation is balanced automatically. | Base | Developer tools | $0.004 | 2026-09-06 |
https://combinatorics.openverbs.com/v1/catalan The n-th Catalan number Cₙ = C(2n, n)/(n+1), counting balanced bracketings, binary trees, and many other structures. Requires n ≤ 10000. | Base | Other | $0.004 | 2026-10-02 |
https://combinatorics.openverbs.com/v1/combinations Binomial coefficient nCr = n!/(r!(n-r)!), the number of unordered r-subsets of n. Requires r ≤ n and min(r, n-r) ≤ 10000. | Base | Other | $0.004 | 2026-10-02 |
https://combinatorics.openverbs.com/v1/factorial Exact factorial n! for 0 ≤ n ≤ 20000, returned as a decimal string with its digit count. | Base | Developer tools | $0.004 | 2026-10-02 |
https://combinatorics.openverbs.com/v1/multinomial Multinomial coefficient (k1+k2+…)! / (k1! k2! …) — the number of ways to partition n = Σki items into labelled groups of the given sizes. The sum must be ≤ 20000. | Base | Other | $0.004 | 2026-10-02 |
https://combinatorics.openverbs.com/v1/permutations Number of ordered arrangements of r items from n, nPr = n!/(n-r)!. Requires r ≤ n and r ≤ 10000. | Base | Other | $0.004 | 2026-10-02 |
https://data.openverbs.com/v1/diff Compute the RFC 6902 JSON Patch that transforms `source` into `target`. The patch is a minimal array of add/remove/replace operations. | Base | Developer tools | $0.004 | 2026-10-02 |
https://data.openverbs.com/v1/flatten Flatten a nested object/array into a single-level object whose keys are the delimited paths to each leaf (default delimiter `.`). Requires an object or array. | Base | Developer tools | $0.004 | 2026-09-06 |
https://data.openverbs.com/v1/merge Deep-merge an ordered list of JSON documents, left to right. Objects are merged key-by-key; arrays, scalars and null in a later document replace the earlier value (last-wins, no array concatenation). | Base | Developer tools | $0.004 | 2026-10-02 |
https://data.openverbs.com/v1/patch Apply an RFC 6902 JSON Patch to a JSON document and return the result. An invalid or unresolvable patch (e.g. a failed `test`, or a path that does not exist) is rejected before payment. | Base | Developer tools | $0.004 | 2026-09-06 |
https://data.openverbs.com/v1/query Evaluate a JMESPath expression against a JSON value and return the selected/projected result. A malformed expression is rejected before payment. | Base | Developer tools | $0.004 | 2026-10-02 |
https://data.openverbs.com/v1/unflatten Rebuild a nested object from a single-level object whose keys are delimited paths (default delimiter `.`) — the inverse of flatten. Requires a flat object. | Base | Other | $0.004 | 2026-09-06 |
https://datetime.openverbs.com/v1/day-of-year Return the ordinal day of the year (1..366), the number of days in that year and whether it is a leap year. | Base | Other | $0.004 | 2026-10-02 |
https://datetime.openverbs.com/v1/easter Compute the date of Western (Gregorian) Easter Sunday for a year in 1583..9999 using the Anonymous Gregorian computus. | Base | Developer tools | $0.004 | 2026-10-02 |
https://datetime.openverbs.com/v1/from-jdn Convert a Julian Day Number back to a proleptic-Gregorian date, with the ISO weekday (1=Monday..7=Sunday) and its name. | Base | Media | $0.004 | 2026-09-06 |
https://datetime.openverbs.com/v1/iso-week Return the ISO-8601 week-numbering year, week number (1..53) and weekday (1=Monday..7=Sunday) for a Gregorian date. The ISO year can differ from the calendar year around New Year. | Base | Other | $0.004 | 2026-10-02 |
https://datetime.openverbs.com/v1/to-jdn Convert a proleptic-Gregorian calendar date to its Julian Day Number (the integer count of days since JDN 0, 1 January 4713 BC in the proleptic Julian calendar). | Base | Media | $0.004 | 2026-10-02 |
https://datetime.openverbs.com/v1/weekday Return the ISO weekday (1=Monday..7=Sunday) and its name for a Gregorian date. | Base | Other | $0.004 | 2026-10-02 |
https://distribution.openverbs.com/v1/binomial Binomial distribution with `trials` (n ≥ 0, ≤ 1e6) and success `probability` (0..1). `function` selects the mass (pmf), cumulative distribution (cdf) or quantile / inverse-CDF. | Base | Other | $0.004 | 2026-10-02 |
https://distribution.openverbs.com/v1/normal Normal distribution with optional mean (default 0) and standard deviation sd (default 1). `function` selects the density (pdf), cumulative distribution (cdf) or quantile / inverse-CDF. | Base | Other | $0.004 | 2026-10-02 |
https://distribution.openverbs.com/v1/poisson Poisson distribution with rate `lambda` (> 0, ≤ 1e9). `function` selects the mass (pmf), cumulative distribution (cdf) or quantile / inverse-CDF. | Base | Other | $0.004 | 2026-10-02 |
https://distribution.openverbs.com/v1/t Student's t distribution with df degrees of freedom (> 0). `function` selects the density (pdf), cumulative distribution (cdf) or quantile / inverse-CDF. | Base | Other | $0.004 | 2026-10-02 |
https://emailauth.openverbs.com/v1/dkim-parse Parse a DKIM public-key DNS TXT record ("v=DKIM1; k=rsa; p=…") into its key type, public key, hash algorithms, service types and flags. An empty `p` is reported as a revoked key. A missing `p` tag is a clean 400. | Base | Identity | $0.004 | 2026-09-06 |
https://emailauth.openverbs.com/v1/dmarc-parse Parse a DMARC TXT record ("v=DMARC1; p=…") into its policy, alignment, sampling and reporting tags. Missing or invalid policy/alignment/pct values are clean 400s. | Base | Identity | $0.004 | 2026-09-06 |
https://emailauth.openverbs.com/v1/spf-check Evaluate an SPF record against an IPv4/IPv6 address using only its literal ip4/ip6/all mechanisms. DNS-dependent mechanisms (include, a, mx, exists, redirect) reached before a match yield an honest `indeterminate` resul… | Base | Identity | $0.004 | 2026-09-06 |
https://emailauth.openverbs.com/v1/spf-parse Parse an SPF TXT record ("v=spf1 …") into its qualified mechanisms and modifiers. Records that do not start with v=spf1 or use unknown mechanisms are clean 400s. | Base | Identity | $0.004 | 2026-09-06 |
https://finance.openverbs.com/v1/future-value Future value of a present sum and/or a level annuity, given a per-period rate and number of periods. Set dueAtBeginning=true for an annuity-due (payments at the start of each period). | Base | Other | $0.004 | 2026-10-02 |
https://finance.openverbs.com/v1/interest Grow a principal by simple or compound interest over a number of years. Compound interest uses compoundsPerYear compounding periods (default 12, monthly). | Base | Other | $0.004 | 2026-10-02 |
https://finance.openverbs.com/v1/irr Internal rate of return (per period) of a series of cash flows, solved with a bounded bisection. Requires at least one positive and one negative flow; flows with no sign change or no bracketable root are rejected as a c… | Base | Other | $0.004 | 2026-09-06 |
https://finance.openverbs.com/v1/loan Compute the level monthly payment, total paid and total interest of a fully-amortizing loan. Handles a 0% rate. Set schedule=true to also return the full month-by-month amortization table. | Base | Developer tools | $0.004 | 2026-10-02 |
https://finance.openverbs.com/v1/npv Net present value of a series of cash flows discounted at a per-period rate. cashflows[0] is the time-0 flow (typically the initial outlay, negative). | Base | Other | $0.004 | 2026-10-02 |
https://finance.openverbs.com/v1/present-value Present value of a future sum and/or a level annuity, given a per-period rate and number of periods. Set dueAtBeginning=true for an annuity-due. | Base | Other | $0.004 | 2026-10-02 |
https://format.openverbs.com/v1/canonicalize Parse a document (in any format) and re-emit it in the RFC 8785 JSON Canonicalization Scheme form — sorted keys, canonical number/string formatting — plus the SHA-256 of the canonical bytes for stable hashing, signing a… | Base | Developer tools | $0.004 | 2026-09-06 |
https://format.openverbs.com/v1/convert Transcode a document between json, json5, jsonc, yaml, xml, csv, tsv, toml, ndjson, ini, env, properties, plist and querystring. Any source converts to any target through a JSON hub. Malformed input or a target that can… | Base | Media | $0.004 | 2026-09-06 |
Descriptions are the seller’s own words from the catalogue and are not checked by us. A listed price is a registration, not an observed charge.
Data CC-BY-4.0, attribution: data by satohub.ai. Collector run 2026-10-05. Appearing here is not an endorsement. Check an endpoint with the doctor.