Assay

Every paid API on Algorand, tested rather than listed.

861 x402 endpoints from 39 merchants across 46 hosts — each one called on a schedule to check it answers, that its 402 challenge parses, and that it charges what it advertises.

Endpoints live
773
Open defects
85
Overcharging
8
Paid calls
28,684
Last sweep
19h ago · 100% covered
Buyer reviews
none yet
8 endpoints charge more than they advertiseworst: api.micropay.website/api/v1/images/generations lists $0.01, demands $0.50 (50×)

12 merchants · 762 endpoints · 80 with an open defect, listed below each merchant

api.syraa.fun

Markets & trading12 endpoints2 hosts1 loopback host

Cross-asset market pulse with latest Pyth oracle prices for SOL/USD, BTC/USD, and ETH/USD including confidence intervals and publish times. Use when an agent needs a quick multi-asset price snapshot from authoritative feeds

50%live16,858paid calls15payers
  • Unreachable host/insights/defi-tvlthe host did not answer
  • Unreachable host/insights/gas-oraclethe host did not answer
  • Unreachable host/insights/market-pulsethe host did not answer
  • Unreachable host/insights/network-healththe host did not answer
  • Unreachable host/insights/token-metricsthe host did not answer
  • Unreachable host/insights/volatility-indexthe host did not answer
$0.0005 – $0.10
USDC
Degraded6 of 12 failing · 20h ago

agent402.tools

Utilities514 endpoints

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

98%live2,089paid calls4payers
  • Pays elsewhere/api/route/executethe 402 asks for W4GZHN36…B67UOE, not the listed payout address
  • Pays elsewhere/api/route/execute-maxthe 402 asks for W4GZHN36…B67UOE, not the listed payout address
  • Price mismatch/api/answerlisted $0.03 · charges $0.08 (2.7×)
  • Price mismatch/api/skill/article-digestlisted $0.08 · charges $0.10 (1.3×)
  • Price mismatch/api/skill/company-dossierlisted $0.50 · charges $0.12
  • Price mismatch/api/skill/crypto-dossierlisted $0.30 · charges $0.12
  • Price mismatch/api/skill/domain-intellisted $0.25 · charges $0.075
  • Price mismatch/api/stock-quotelisted $0.01 · charges $0.003
$0.001 – $1.50
USDC
Pays elsewhere2 rerouted · 19h ago2 above list8 of 514 failing

127.0.0.1:4021

Chain data133 endpoints2 hosts1 loopback host

Algorand Foundation–related holder wallets snapshot for ALGO (full list in one response; not paged)

69%live230paid calls2payers
  • Unreachable host/x402/algo/nodesthe host did not answer
  • Unreachable host/x402/asa/0/activitythe host did not answer
  • Unreachable host/x402/asa/0/top-holdersthe host did not answer
  • Unreachable host/x402/asa/0/top-holders-previouslythe host did not answer
  • Price mismatch/x402/algo/foundation-total-historylisted $0.02 · charges $0.10 (5.0×)
  • Price mismatch/x402/algo/nodes-historylisted $0.02 · charges $0.10 (5.0×)
  • No schema published/x402/algo/nodes-bucket-historyno input or output schema in the listing
  • No schema published/x402/algo/nodes-wallet-historyno input or output schema in the listing
  • No schema published/x402/app-unique-sendersno input or output schema in the listing
  • No schema published/x402/asa/0/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/1138500612/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/1138500612/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/1138500612/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/1284444444/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/1284444444/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/1284444444/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2200000000/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/2200000000/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2200000000/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2726252423/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/2726252423/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2726252423/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2994233666/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/2994233666/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/2994233666/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/3160000000/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/3160000000/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/3160000000/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/3203964481/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/3203964481/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/3203964481/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/393537671/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/393537671/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/393537671/wallet-historyno input or output schema in the listing
  • No schema published/x402/asa/700965019/monthly-reportno input or output schema in the listing
  • No schema published/x402/asa/700965019/pool-lp-wallet-historyno input or output schema in the listing
  • No schema published/x402/gora/validator-stake-historyno input or output schema in the listing
  • No schema published/x402/gora/wallet-stake-historyno input or output schema in the listing
  • No schema published/x402/hay/wallet-stake-historyno input or output schema in the listing
  • No schema published/x402/tinyman/wallet-stake-historyno input or output schema in the listing
$0.01 – $0.50
USDC
Overcharges2 above list · 19h ago40 of 133 failing

head-hive.fly.dev

Utilities6 endpoints

Quick Answer — Single expert agent answers a question directly. Cheapest tier, no team fan-out

0%live207paid calls2payers
  • No 402 challenge/api/analyzeanswered without a 402 challenge
  • No 402 challenge/api/askanswered without a 402 challenge
  • No 402 challenge/api/extractanswered without a 402 challenge
  • No 402 challenge/api/memory/recallanswered without a 402 challenge
  • No 402 challenge/api/memory/storeanswered without a 402 challenge
  • No 402 challenge/api/plananswered without a 402 challenge
$0.002 – $0.10
USDC
Broken6 of 6 failing · 19h ago

api.scrape402.site

Chain data2 endpoints2 hosts1 loopback host

Extract clean, markdown-formatted text from any given URL, bypassing common web blocks

50%live176paid calls172payers
  • Unreachable host/scrapethe host did not answer
$0.10
USDC
Degraded1 of 2 failing · 20h ago

algo.netintel.dev

Chain data73 endpoints

DNS lookup / nslookup / dig API — resolve the common DNS record types (A, AAAA, MX, TXT, NS, CNAME, SOA, PTR) for a domain. Parses SPF/DMARC from TXT plus DKIM at the default._domainkey selector, and cross-checks A records across Google/Cloudflare/Quad9 resolvers for propagation consistency

97%live76paid calls1payer
  • Price mismatch/schema-parse/extractlisted $0.10 · charges $0.05
  • Price mismatch/sentiment/analyzelisted $0.03 · charges $0.002
$0.002 – $0.25
USDC
Degraded2 of 73 failing · 19h ago

dashboard.frynetworks.com

Chain data2 endpoints2 hosts

Live Fry Networks DePIN device-staking pool telemetry (aggregated)

50%live67paid calls20payers
  • No 402 challenge/x402/depin/my-devicesanswered without a 402 challenge
$0.005 – $0.01
USDC
Degraded1 of 2 failing · 20h ago

api.micropay.website

AI & inference7 endpoints4 hosts

OpenAI-compatible chat completion from qwen3.6-plus, returning assistant messages with optional SSE token streaming

0%live39paid calls3payers
  • Price mismatch/api/v1/chat/completionslisted $0.01 · charges $0.10 (10×)
  • Price mismatch/api/v1/images/generationslisted $0.01 · charges $0.50 (50×)
  • Rejected the call/api/v1/chat/completionsrefused the request outright
  • Rejected the call/api/v1/ide/agentrefused the request outright
  • Rejected the call/api/v1/chat/completionsrefused the request outright
  • Rejected the call/api/v1/ide/agentrefused the request outright
  • Rejected the call/api/v1/images/generationsrefused the request outright
$0.01 – $0.10
USDC
Broken7 of 7 failing · 19h ago2 above list

Upload one file as a Base64-encoded JSON payload

0%live34paid calls1payer
  • Rejected the call/api/v1/pinrefused the request outright
  • Rejected the call/api/v1/pinrefused the request outright
$0.010328
USDC
Broken2 of 2 failing · 19h ago

second-opinion-production.up.railway.app

Utilities8 endpoints2 hosts

Second Opinion quick: an independent reasoning-only check (no web research) of your claim's logic and consistency with established knowledge. Honest 'inconclusive' when the claim needs live research

37%live23paid calls3payers
  • Price mismatch/v1/verifylisted $0.05 · charges $0.20 (4.0×)
  • Price mismatch/v1/verify/gptlisted $0.25 · charges $0.20
  • Price mismatch/v1/verify/panellisted $0.25 · charges $0.75 (3.0×)
  • Price mismatch/v1/verify/quicklisted $0.05 · charges $0.03
  • Rejected the call/v1/verifyrefused the request outright
$0.03 – $0.25
USDC
Broken5 of 8 failing · 19h ago2 above list

civitas-api.civitasv.workers.dev

Chain data2 endpoints2 hosts1 loopback host

Send an end-to-end encrypted message on Algorand: returns the unsigned 0-ALGO payment transaction whose note carries the sealed ciphertext, for the sender to sign and submit

50%live19paid calls2payers
  • Unreachable host/x402-empty-config-probethe host did not answer
$0.01 – $0.10
USDC
Degraded1 of 2 failing · 19h ago

Consensa clearance: consented, attributed use of OSS knowledge

0%live15paid calls2payers
  • Rejected the call/v1/clearancerefused the request outright
$0.01
USDC
Broken1 of 1 failing · 19h ago