Crypto Math
secp256k1, P-256 and P-384 public parameters (p, n, G) from SEC 2, with an on-curve check of a public point.
DataLiveeip155:8453Exactvia cdp
Secp256k1EcdsaElliptic-curveSec2
Calls · 30d
2
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 6 snapshots so far.
$24.31
Verified settled volume
1,175 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-24 18:37Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xb531320805C5BED1D46AEaDcF4F008FDF172DBDaThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://crypto-math.x402tookit.com/ec-params",
"description": "secp256k1, P-256 and P-384 public parameters (p, n, G) from SEC 2, with an on-curve check of a public point.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"curve": "secp256k1",
"publicKey": "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798"
}
},
"output": {
"asOf": "2026-10-11T23:46:27.980Z",
"point": {
"x": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"y": "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8",
"valid": true,
"yParity": "even",
"isGenerator": true,
"compressedHex": "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"uncompressedHex": "0479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8"
},
"params": {
"a": {
"hex": "0000000000000000000000000000000000000000000000000000000000000000"
},
"b": {
"hex": "0000000000000000000000000000000000000000000000000000000000000007"
},
"p": {
"hex": "fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f",
"decimal": "115792089237316195423570985008687907853269984665640564039457584007908834671663"
},
"oid": "1.3.132.0.10",
"name": "secp256k1",
"order": {
"hex": "fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141",
"decimal": "115792089237316195423570985008687907852837564279074904382605163141518161494337"
},
"aliases": [
"secp256k1",
"K-256"
],
"cofactor": 1,
"equation": "y^2 = x^3 + 7 (mod p)",
"commonUse": "Bitcoin, Ethereum and many other chains (ECDSA and Schnorr)",
"fieldBits": 256,
"generator": {
"x": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"y": "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8"
},
"securityStrengthBits": 128
},
"source": "SEC 2 v2 (Certicom) and NIST FIPS 186-4 curve parameters, point check computed locally",
"reasons": [
"Parameters are the published SEC 2 v2 / FIPS 186-4 values; cofactor is 1, so any on-curve point other than infinity has order n."
],
"summary": "The point is on secp256k1.",
"verdict": "ON_CURVE",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"that the point belongs to anyone or was generated from a real private key",
"the point at infinity encoding",
"…2 more"
]
}
},
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"
},
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact",
"network": "solana",
"mimeType": "application/json",
"resource": "https://crypto-math.x402tookit.com/ec-params",
"description": "secp256k1, P-256 and P-384 public parameters (p, n, G) from SEC 2, with an on-curve check of a public point.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"curve": "secp256k1",
"publicKey": "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798"
}
},
"output": {
"asOf": "2026-10-11T23:46:27.980Z",
"point": {
"x": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"y": "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8",
"valid": true,
"yParity": "even",
"isGenerator": true,
"compressedHex": "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"uncompressedHex": "0479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8"
},
"params": {
"a": {
"hex": "0000000000000000000000000000000000000000000000000000000000000000"
},
"b": {
"hex": "0000000000000000000000000000000000000000000000000000000000000007"
},
"p": {
"hex": "fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f",
"decimal": "115792089237316195423570985008687907853269984665640564039457584007908834671663"
},
"oid": "1.3.132.0.10",
"name": "secp256k1",
"order": {
"hex": "fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141",
"decimal": "115792089237316195423570985008687907852837564279074904382605163141518161494337"
},
"aliases": [
"secp256k1",
"K-256"
],
"cofactor": 1,
"equation": "y^2 = x^3 + 7 (mod p)",
"commonUse": "Bitcoin, Ethereum and many other chains (ECDSA and Schnorr)",
"fieldBits": 256,
"generator": {
"x": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"y": "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8"
},
"securityStrengthBits": 128
},
"source": "SEC 2 v2 (Certicom) and NIST FIPS 186-4 curve parameters, point check computed locally",
"reasons": [
"Parameters are the published SEC 2 v2 / FIPS 186-4 values; cofactor is 1, so any on-curve point other than infinity has order n."
],
"summary": "The point is on secp256k1.",
"verdict": "ON_CURVE",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"that the point belongs to anyone or was generated from a real private key",
"the point at infinity encoding",
"…2 more"
]
}
},
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact",
"network": "polygon",
"mimeType": "application/json",
"resource": "https://crypto-math.x402tookit.com/ec-params",
"description": "secp256k1, P-256 and P-384 public parameters (p, n, G) from SEC 2, with an on-curve check of a public point.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"curve": "secp256k1",
"publicKey": "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798"
}
},
"output": {
"asOf": "2026-10-11T23:46:27.980Z",
"point": {
"x": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"y": "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8",
"valid": true,
"yParity": "even",
"isGenerator": true,
"compressedHex": "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"uncompressedHex": "0479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8"
},
"params": {
"a": {
"hex": "0000000000000000000000000000000000000000000000000000000000000000"
},
"b": {
"hex": "0000000000000000000000000000000000000000000000000000000000000007"
},
"p": {
"hex": "fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f",
"decimal": "115792089237316195423570985008687907853269984665640564039457584007908834671663"
},
"oid": "1.3.132.0.10",
"name": "secp256k1",
"order": {
"hex": "fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141",
"decimal": "115792089237316195423570985008687907852837564279074904382605163141518161494337"
},
"aliases": [
"secp256k1",
"K-256"
],
"cofactor": 1,
"equation": "y^2 = x^3 + 7 (mod p)",
"commonUse": "Bitcoin, Ethereum and many other chains (ECDSA and Schnorr)",
"fieldBits": 256,
"generator": {
"x": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"y": "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8"
},
"securityStrengthBits": 128
},
"source": "SEC 2 v2 (Certicom) and NIST FIPS 186-4 curve parameters, point check computed locally",
"reasons": [
"Parameters are the published SEC 2 v2 / FIPS 186-4 values; cofactor is 1, so any on-curve point other than infinity has order n."
],
"summary": "The point is on secp256k1.",
"verdict": "ON_CURVE",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"that the point belongs to anyone or was generated from a real private key",
"the point at infinity encoding",
"…2 more"
]
}
},
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1,
"alsoAvailable": {
"llms": "https://crypto-math.x402tookit.com/llms.txt",
"catalog": "https://crypto-math.x402tookit.com/catalog",
"message": "Crypto Math has 10 pay-per-call endpoints (Modular arithmetic, primality, CRT, curve parameters, RSA sizing, encodings, entropy and check digits.), from $0.02 a call. See the full menu and send your agents our way.",
"openapi": "https://crypto-math.x402tookit.com/openapi.json",
"related": [
{
"url": "https://crypto-math.x402tookit.com/encoding",
"path": "/encoding",
"what": "Convert public bytes between hex, base64 and base64url (RFC 4648) with strict decoding an…",
"price": "$0.02"
},
{
"url": "https://crypto-math.x402tookit.com/entropy",
"path": "/entropy",
"what": "Shannon entropy in bits per symbol from a frequency table, plus min-entropy, collision en…",
"price": "$0.02"
},
{
"url": "https://crypto-math.x402tookit.com/gcd-extended",
"path": "/gcd-extended",
"what": "gcd, lcm and extended-Euclid Bezout coefficients of two integers, plus gcd/lcm of up to 2…",
"price": "$0.02"
}
]
}
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.02USDC≈ $0.02 USD
on Base · exact scheme
Pay 0.02 USDC on Base to 0xb531…2DBDa. The signed payment is good for 5 minutes.
- Paid to
- 0xb531…2DBDa
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 20000 smallest units
20000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- DUPiup…eEm8s
- Token contract
- EPjFWd…TDt1v
- Payment window
- 5 minutes
20000units
on Polygon · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xb531…2DBDa
- Token contract
- 0x3c49…c3359
- Payment window
- 5 minutes
20000units
on Arbitrum · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xb531…2DBDa
- Token contract
- 0xaf88…e5831
- Payment window
- 5 minutes
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb"
},
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"amount": "20000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"amount": "20000",
"scheme": "exact",
"network": "eip155:137",
"maxTimeoutSeconds": 300
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"amount": "20000",
"scheme": "exact",
"network": "eip155:42161",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"curve": "secp256k1",
"publicKey": "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798"
}
},
"output": {
"type": "json",
"example": {
"asOf": "2026-10-11T23:46:27.980Z",
"point": {
"x": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"y": "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8",
"valid": true,
"yParity": "even",
"isGenerator": true,
"compressedHex": "0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"uncompressedHex": "0479be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8"
},
"params": {
"a": {
"hex": "0000000000000000000000000000000000000000000000000000000000000000"
},
"b": {
"hex": "0000000000000000000000000000000000000000000000000000000000000007"
},
"p": {
"hex": "fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f",
"decimal": "115792089237316195423570985008687907853269984665640564039457584007908834671663"
},
"oid": "1.3.132.0.10",
"name": "secp256k1",
"order": {
"hex": "fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141",
"decimal": "115792089237316195423570985008687907852837564279074904382605163141518161494337"
},
"aliases": [
"secp256k1",
"K-256"
],
"cofactor": 1,
"equation": "y^2 = x^3 + 7 (mod p)",
"commonUse": "Bitcoin, Ethereum and many other chains (ECDSA and Schnorr)",
"fieldBits": 256,
"generator": {
"x": "79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798",
"y": "483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8"
},
"securityStrengthBits": 128
},
"source": "SEC 2 v2 (Certicom) and NIST FIPS 186-4 curve parameters, point check computed locally",
"reasons": [
"Parameters are the published SEC 2 v2 / FIPS 186-4 values; cofactor is 1, so any on-curve point other than infinity has order n."
],
"summary": "The point is on secp256k1.",
"verdict": "ON_CURVE",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"that the point belongs to anyone or was generated from a real private key",
"the point at infinity encoding",
"…2 more"
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"curve"
],
"properties": {
"x": {
"type": "string",
"description": "Point x coordinate, decimal or 0x hex (give with y)"
},
"y": {
"type": "string",
"description": "Point y coordinate, decimal or 0x hex (give with x)"
},
"curve": {
"type": "string",
"description": "secp256k1, secp256r1 (P-256) or secp384r1 (P-384)"
},
"publicKey": {
"type": "string",
"description": "PUBLIC key hex: 04||X||Y uncompressed or 02/03||X compressed; not a private scalar"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"point": {
"type": [
"null",
"object"
],
"properties": {
"x": {
"type": [
"null",
"string"
]
},
"y": {
"type": [
"null",
"string"
]
},
"valid": {
"type": [
"boolean",
"null"
]
},
"yParity": {
"type": [
"null",
"string"
]
},
"isGenerator": {
"type": [
"boolean",
"null"
]
},
"compressedHex": {
"type": [
"null",
"string"
]
},
"uncompressedHex": {
"type": [
"null",
"string"
]
}
}
},
"params": {
"type": [
"null",
"object"
],
"properties": {
"a": {
"type": [
"null",
"object"
],
"properties": {
"hex": {
"type": [
"null",
"string"
]
}
}
},
"b": {
"type": [
"null",
"object"
],
"properties": {
"hex": {
"type": [
"null",
"string"
]
}
}
},
"p": {
"type": [
"null",
"object"
],
"properties": {
"hex": {
"type": [
"null",
"string"
]
},
"decimal": {
"type": [
"null",
"string"
]
}
}
},
"oid": {
"type": [
"null",
"string"
]
},
"name": {
"type": [
"null",
"string"
]
},
"order": {
"type": [
"null",
"object"
],
"properties": {
"hex": {
"type": [
"null",
"string"
]
},
"decimal": {
"type": [
"null",
"string"
]
}
}
},
"aliases": {
"type": [
"array",
"null"
],
"items": {
"type": "string"
}
},
"cofactor": {
"type": [
"null",
"number"
]
},
"equation": {
"type": [
"null",
"string"
]
},
"commonUse": {
"type": [
"null",
"string"
]
},
"fieldBits": {
"type": [
"null",
"number"
]
},
"generator": {
"type": [
"null",
"object"
],
"properties": {
"x": {
"type": [
"null",
"string"
]
},
"y": {
"type": [
"null",
"string"
]
}
}
},
"securityStrengthBits": {
"type": [
"null",
"number"
]
}
}
},
"source": {
"type": [
"null",
"string"
]
},
"reasons": {
"type": [
"array",
"null"
],
"items": {
"type": "string"
}
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"notChecked": {
"type": [
"array",
"null"
],
"items": {
"type": "string"
}
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-24 18:37Z
- Last indexed by Roundhouse
- 2026-10-25 18:31Z
- Last enriched (probe, favicon, geo)
- 2026-10-20 22:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 6 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Crypto Math and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Crypto%20Math' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://crypto-math.x402tookit.com/ec-params, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.